Nikki - My Twin-Half Sister free porn video

My sister got Nichole, Nikki, as her handle, I am Dalton. At least we didn't get stuck with some cutesy twin names like Nick and Nikki. As you would expect Nikki and I grew up as one, twin-linked more in mind than body, but still close, almost inseparable. For the first years of our lives, we shared a room then our step-dad bought us a house with separate bedrooms that had an adjoining bathroom. In those early years, when we shared a room, we spent many nights in the same bed, sleeping together to keep the night terrors at bay. Even after my sister and I got separate rooms we spent more time together than apart. About the time we turned 10 we stopped. No one told us not to, we instinctively knew the time had come to stop bathing and sleeping together, but in those formative years, we learned more about the other than we did ourselves. Through years of innocent but intimate exploration of our bodies, she only knew about the birthmark between her butt cheeks from me, and she told me about the moles on the back of my neck and one between my legs, under my ball sack.

By the time we closed in on our 17th birthday, Nikki had transformed from a stick-thin tomboy to a young woman with graceful feminine curves and lines. I had grown several inches taller than Nikki and filled out enough to play first-string on the football and basketball teams. Even though our bodies were maturing and our minds curious, our parents wouldn't allow us to date until we were 18. I think it was because of Nikki, but I couldn't date either, which I thought was unfair.

Nikki and I were never shy to talk to each other about anything. When puberty corrupted our minds and overpowered our bodies, she and I explored forbidden thoughts and secret feelings. We spent a lot of time describing how we thought about sex, what it might feel like and who our partners of choice were. As twins, it wasn't surprising that we shared many of the same ideas, fantasies, and frustrations. The subject of sex was never far from our minds or lips.

Nikki and I got matching laptop computers for our 17th birthday. They had all the requisite programs for earnest high school juniors, but they also had built-in webcams and internet apps. The first night we had our computers, my sister and I figured out how to log on and set up accounts to connect over the internet. We spent that first night talking to each other by video messaging. Since we were the first in our circle of friends to have internet video, Nikki and I spent much time talking to each other, there was no one else.

Rachel, Nikki's best friend got an internet-ready laptop three weeks after we did. In minutes the two girls were connected and talking by video messaging. I didn't bother hooking up with Rachel even though she was the hottest girl in the fucking universe, I couldn't date her so the effort of talking to her would be too frustrating. Several days later I was talking to Nikki but she signed off to talk to Rachel. Later that night just before I went to bed, I noticed my sister was still online so I clicked her icon to say hi. The picture that came up on my screen was Nikki's bedroom but she wasn't there. Just as I realized that she had not turned off her camera my twin came into view. She had her back to the lens as she pawed through a dresser drawer looking for a nightgown. She was dressed only in a pale-yellow bra and snug hip-rider jeans.

I froze in place staring at my screen. Nikki was facing away from me so my view was her back. When she bent down to open the bottom drawer, I did something completely impulsive, completely wicked, I hit the video record button so the incoming video was being stored on my hard drive. I sat and stared at my sister as she moved around the room, readying for bed. With fingers behind her back, she unhooked her bra, slid it off her arms, and tossed it to the bed. Her jeans went next. She unbuttoned, unzipped then pushed them off her hips and lifted her legs from them. I was riveted to the monitor. Her panties were last, sliding down her long athletic thighs to the floor. When she turned sideways to the camera, I got a stunning profile of her firm round tits and gently molded stomach. Her ass curved out, over and around to form the top of her thighs; the shape and form of her butt perfectly balanced the graceful profile of her breasts. When she turned to pick her bra off the bed I got a full-frontal view of my sibling, my eyes locked on to the thatch of dark curls at the junction of her thighs. The single eye on my prick saw a fully developed naked female and began to take notice. She slipped the nightshift over her up-stretched arms which cause her tits and stomach to tighten then as the gown fell over her hips, she shook her head, causing her hair to fluff and fall into place. Nikki hit the light switch and the last thing I saw was a shadow going to bed. As I looked at the dark screen my cock crystallized into a full-strength hard-on. The last time I saw Nikki naked we were much younger, and I knew she had changed, but I hadn't paid much attention to her metamorphosis until that night. I watched that short video of my sister a dozen times that first night, freezing the motion and zooming in on every part of her.

A couple of weeks after I captured Nikki nude, she dashed into my room bubbling with excitement, “Hey, you gotta see this!” She sat at my laptop and tapped a few keys as she said, “Rachel and Shandra showed me this, it's awesome. Mom and dad would flip out if they saw it, but it's awesome,” she repeated. I looked over her shoulder as she brought up what looked like a porn site. There was a picture of a hot, buffed-looking couple standing side by side. He was wearing only tight blue briefs and she had on a black sports bra, and matching figure-hugging, stomach-to-thigh spandex pants. Arrows were pointing to various parts of their bodies; each arrow was labeled. The caption at the top of the page stated, 'Learn the answer to questions your parents won't give you.'

“Porn? You guys look at porn?” I was interested.

“No, not pornography, it's more like sex ed.” There was a menu on the left side of the screen that listed topics from Anus to Zygote, links that would send you to the proper definition. Nikki looked up at me, “What do you want to see?”

“You pick.” She clicked on the first word, Anus and the picture switched to a butt hole. It described Anus then below that were links to Anal Sex, Anal stimulation, Analingius, and a couple of other things. Nikki shifted to anal sex and a picture of the hot guy’s cock in the hots girl's ass popped up on the screen with a paragraph about anal sex and how it was used by the Greeks and Romans to screw a girl so she would be virgin when she married, and could be done to prevent pregnancy when the woman was fertile. The narrative went on about gay guys, but that wasn't for me, I could only focus on the girl’s ass with the end of his hard-on in it.

My sister looked up at me, “I don’t know if I could do that, I have a place for a man, but it isn't there.”

“Where is it?” I teased. She moved the cursor to the menu and clicked on ‘Vagina’. 'Vagina, Pussy, Cunt, Box, Slit, Gash, and Cum Bucket,' were some of the terms used to describe that part of the woman. Nikki and I read the captions while looking at several screenshots of the hot girl's pussy. From there we went to Breasts, Penis, and Testicles. By the time we shut down my computer, I had an erection (cock, prick, hard-on, boner, woody, meat pole) that hurt, but I had actually learned something.

Nikki and I went back to that website almost every day for weeks. We read all that was available about our bodies, sex, and sexuality. Not only was it educational, but the pictures and videos would change occasionally, giving us new de***********ions and views for various acts and body parts. I was learning a lot, and I used the images of the hot woman as inspiration for some nut-wrenching orgasms after the lights went out. About three months after finding the site we watched the guy shave the girl's pubic hair. When I logged off Nikki said, “I want to see a naked boy, I haven't done that since we were little,” she stepped back from me, “take your clothes off.”

“You want me to get naked?”

“Sure, it won’t be the first time, and I want to see if you look like him.”

“Only if you do it too.”

Nikki flushed red, hesitated for a few moments then nodded, “Okay.”

My heart started tripping which surprised me because even though I'd seen my twin sister naked for half our lives, the idea of seeing her as a mature female was playing havoc with my hormones. I opened and dropped my pants then kicked them off while pulling my shirt over my head. Nikki started on her blouse and bra then her skirt and panties followed. In less than a minute I was standing face to face with my fully developed twin half-sister. Her cheeks were cherry red and I watched as the flush expanded down her neck to her breasts. I began to shake as I stared at her firm round tits and the circle of darker brown skin at the peaks of them. I couldn't think of anything to say except, “Wow. Awesome.”

Interested eyes, a slight smile, more blush, “Really?” Nature was beginning to cause our shyness to fade so she grabbed my elbow and led me to the full-length mirror on the inside of the bathroom door. We stood side by side and looked at our reflections. The first thing that struck me wasn’t our nudity, it was that I was a full head taller than her, but I quickly recovered from that realization and checked her out thoroughly. I couldn't lift my stare from the swatch of brown hair at the junction of her thighs, I could see the top of her vaginal slit through it. When her eyes fell on my prick it began to swell, growing thicker and stronger, defying gravity as it displayed interest in the nude girl just inches from it. When we stepped back to face each other I moved a hand to cover myself but she put hers on my wrist, “No, let me see,” she looked up at me with a half grin and glinting eyes, “It’s a lot bigger than I remember, you could hurt a girl with that.” My entire body shuddered as her eyes settled on the thick dark curls that crowned my prick and balls and my erection reached full-sized in seconds. After studying the long thick muscle that was angled towards the ceiling Nikki said, “Turn around.” I gladly spun away, because even though we doing something we both agreed to, I was embarrassed by my erection. She inspected my back and butt then said, “Rachel likes looking at your ass, she asked if I've seen you naked and if your butt looks so tight with no pants on.”

I turned back to my sister and gestured for her to turn for me, “What do you tell her?”

As she faced away from me, she answered, “That you're my brother and I would puke if I ever saw you naked.” She finished her circle looking at me with an impish grin, her eyes dropped to my hard-on again, “Turn around, make your butt cheeks bounce.” I faced away from Nikki and started flexing my ass muscles, bouncing the left and right sides, alternating while she watched with wide glittering eyes. I turned back to face her then on an impulse, shook my hips which caused my boner to swing back and forth, slapping against my thighs, she grinned wickedly and watched until it stopped swinging, then I told her to do a butt bounce for me. “I can't do it like that, but I can shake.” She turned her back to me and started shaking and rocking her hips. She finished a 10-second booty dance then bent to pick up her clothes, “You look nice all over but I won't tell Rachael, she'll have to find out for herself.”

I stared at her hips and butt as they rocked and swayed away from me, just as she stepped through the door I called out, “Hey, you didn't puke.” She turned, smiled broadly then blew me a silent kiss. My prick was thumping in sync with my heartbeat, a big bubble of slickness oozed from the end of it. I'd gotten erections watching that short video of my sister a few times, but what we had just done was far different. I enjoyed the video, but it was two-dimensional, incomparable to the multidimensional version of Nikki that just left my room.

After dinner Nikki came back to my room acting timid, “What we did today, is it okay? I know I was being pushy, but I wanted to see a guy.”

I didn't answer her directly but said, “Come here, I have to show you something.” I sat at my laptop and brought up the video of her getting ready for bed that night. When it started, I explained how she had left her camera on and I accidentally saw what she did. She was looking over my shoulder so I heard her gasp as she realized what she was watching.

When it was over, she smacked the back of the head, “You fuck! What the hell was that? Where did it come from? Do you watch it all the time?”

“You left your camera on one night and that's what I saw.”

“You recorded it?” She was angry.

“Yeah, but I only looked at it a couple of times,” I lied.

“Did you see me again?”

“No, only that time.”

“Show me again you perv peeper,” Nikki demanded.

Nikki watched the short show again then turned to me, “Does it work both ways?”

“I don't know.”

“Wait here.” My sister hurried from my room and in 30 seconds her icon was flashing on my screen. I opened the video then shared mine with her. “We can block out our friends and just see each other. I can watch you, you can see me,” she pirouetted for me then laughed.

I answered, “Leave your camera on, I'll leave mine, we can watch each other all the time.”

She hesitated momentarily then blushed lightly, “All the time? You would watch everything I do, I would see you?”

“Yeah, why not?”

My twin sister's lips turned up in a naughty smile, “This could be fun.”

We figured out how to keep our laptop videos running and block out the few others we connected with. The first few days I was self-conscious knowing my sister might be watching while I paraded around my room, but after a while, I didn't even think of it. I mean, Nikki wasn't standing in my room so it was easy to forget she might see. For her part, Nikki didn't try to hide either, and we both knew we were watching, because sometimes in the morning we would say something about what we saw the night before. For the first couple of weeks, we acted as we normally do when alone in our rooms, but gradually we began to show off and act up for the camera. She started taking off or putting on clothes directly in front of the laptop, smiling into the lens. Watching her disrobe and show off was interesting but it didn't get me hot like the first time I saw her. It took only a few nights until the disrobing became more of a strip show as she experimented with more and more sexy moves and poses. One night she put a CD in her player and danced provocatively while undressing, that time I grew a full-sized boner watching as she displayed. I wanted to be sure she knew how her little dance affected me so I pulled my erection through the pee hole of my boxer shorts then posed for her, letting her see my profile from the waist down as I bucked and rolled my hips. The next morning, she caught me before breakfast, “Did you get turned on because of me or did I catch you in a moment?”

“You can't turn me on, you’re my sister.”

“How about halfway turned on?”

“Why halfway?”

“Because only half of me is your sister, you might get hot for the half that isn't,” she laughed.

We continued to visit the Sex Ed website, and we talked a great deal about sex and who we would do it with, I named most of her friends, but she was only focused on my best friend Dante, and one other. When we described what we wanted to do with them I would get a big fucking stiff then she would tease me about it. Since we couldn't date for another few months, she was the only intimate contact I had with a girl, so what we did or talked about would make my balls ache until I jacked off. Eventually our nightly visits on-screen tapered off to weekend play, but they were becoming more erotic. Nikki would slowly strip, then dance to her music, caressing herself, feeling and touching everywhere, letting me watch. The first time she slid her fingers between her legs then brought them to her mouth and licked them I almost came on the floor of my room. Sometimes she would lie on her bed, rocking and rolling while giving me an unhindered view between her legs as she caressed and fingered. I would grab my hard cock then twist and pull on it or hold and rub my balls while she stroked her pussy. After the lights were out, I'd go to the bathroom and beat off into the shower stall. One night she was rubbing her body with oils; the sheen, the smoothness, and the way she was slowly massaging her pussy with oil caused me to cum without even stroking my cock, I was just holding it. I shot my load all over the floor while she watched, I was embarrassed as hell, but she gushed with delight that she could cause that just by playing with herself. That was the night I realized just how torturous hot Nikki was, and how provocative she could act.

We watched the duo on the website give advice on preventing pregnancy so while Nikki and I were talking about what we learned, she suggested I get some condoms and practice putting them on, “When you start getting it on with Rachel, you'll need to know how.” Our high school has a free condom program so the hot horny teenagers who are fucking each other can practice safe sex. The next day I excused myself from my second period class and went to the counselor’s office where rubbers are kept in a plastic box on a small desk just inside the door. Looking around to make sure no one saw me, I quickly dipped into the box and pulled out a hand full of individually wrapped packages. I stuffed them in my pocket and dashed back to class. That afternoon after we got home from school, my sister reached into her backpack and pulled out three condoms. She was blushing as she held them in her open palm, “I got these from school today,” she whispered so the world would not hear.

I snuffled a quick laugh then pulled mine out of my pocket and showed them to her, “And four makes seven.”

She wanted to see me put on and use one of the condoms by ejaculating into it. I wasn't ready to escalate to that level yet, not with my sister watching, so I told her I'd think about it. That night she put on a strip and touch show for me, hoping I would try one while she watched. She finished her show with one foot on her desk so her vagina was close up and centered in the monitor then slipped two fingers into her body while I played with my hard-on but I was still too embarrassed to use a rubber. She looked into the lens, “One of these days,” she pouted as she spread her pussy open with her fingers, “you'll do it for me.” After we switched off the lights, I opened a package, figured out how to roll the latex sleeve over my cock then with a vision of my sister’s pink wet hole in my mind, I filled the end of it.

The next Friday night Nikki sneaked to my room then she and I got physical and practiced with two condoms. After intense urging by Nikki, I relented, letting her watch me play with the rubbers. The first one I rolled onto my erection then we inspected how it encased my cock. After I pulled it off my sister wanted to try too, so she unpacked another rubber then after a couple of hesitant starts managed to get it on me. That was the first time in years she had touched me, and her touch was a hell of a lot more erotic than when we were ten. When it was in place, she looked me straight in the eyes while stroking the underside of my erection with her fingertips; not a full minute later, Nikki sent me over the edge. I filled the nipple at the end of the rubber while she watched with fascinated eyes. When I was done pulsing, she pulled it off but wasn’t careful, so a long dribble of cum splashed on her skirt.

One afternoon Nikki asked me, “Hey, you want to watch someone else on the camera, another girl?”

“What, one of your friends wants to give me a show?”

She smiled impishly, “Rachel is sleeping over tonight, I could turn the camera on and she wouldn't know.”

As I looked at my sister my cock started growing, Rachel is the hottest girl in any of my fantasies, I jacked off a lot with her on the receiving end of my imaginary fucks. “You would do that? I can watch her and she wouldn’t know?”

Nikki put a hand on my chest and pulled her fingers down my stomach to my belt as she said softly, “Don't you want to see another girl, you must get bored watching only your sister.” She glanced down at the growing bulge in my pants, put her palm on it then pressed and rubbed it against my groin, “I bet he wouldn't mind looking at a hot girl.” My heart started thudding and my face got warm, not because of Rachel; that was the first time Nikki ever touched me like that. Even when she put the condom on me, she was all business; that time the caress was purely sexual.

I sat in the darkened room and watched my monitor as Nikki and Rachel laughed, giggled, gossiped, and got ready for bed. My sister had set her laptop at an angle on her desk to catch most of her room and the entrance to the adjoining bathroom. Nikki was the first to undress to panties. She wasn't in a hurry to put on nightwear so she sat on the side of the bed and talked while Rachel slowly pulled her clothes off. Nikki had her back to me but Rachel didn’t. I was saving the video coming into my laptop as she pulled off her shirt then reached behind and unhooked the thin lace-topped bra. She shrugged her shoulders to slip the straps off her arms and I got my first unimpeded look at my fantasy. Rachel’s tits were more rounded than Nikki's, they were larger and heavier, and her nipples didn’t point up like my sister's but straight out. My breath caught in my throat, and my cock exploded to man-sized in seconds. I stood to take my jeans off while transfixed on her big beautiful tits.

By the time I got my pants kicked off my feet, Rachel had pulled hers down her legs and in moments was standing near my sister in just panties too. The two were chatting casually when she grabbed her nightgown, “Wait,” said Nikki, “come here.” Nikki got off the bed to stand in front of the full-length mirror pulling her friend with her by a hand. They stood side by side facing the mirror and started comparing themselves. My view was from behind them so the image on the screen was of their backs as well as the mirror which was reflecting their fronts. Rachel and Nikki laughed and chirped as they posed for each other in the mirror, comparing legs, asses, tits, and hips. Just about the time I couldn't breathe anymore, Rachel pulled her panties off and kicked them aside, Nikki followed her move immediately. My body was reacting only as a seventeen-year-old can react to seeing a nude seventeen-year-old girl, only in this case there were two of them. Rachel put a hand on my sister’s left tit to check out how it fit in her palm then put the same hand on her own breast. Her tit was bigger, the hand didn’t cover it all. Nikki, not to be left out did the same, she used her right hand to compare bust sizes. The two girls stood facing each other, feeling the breasts of the other for a few seconds. After the impromptu feeling of tits, the two modeled and posed while talking about how it would feel to let a boy close to them. Nikki admitted to Rachel that she would like to experience sex with Dante, my best friend. I had been pulling on my cock ever since I dropped my pants and when Rachel told Nikki she would go to bed with me, I groaned, then shot a load halfway across my room.

The next day after Rachel went home, Nikki came looking for me, “Hey, did you see last night?”

“Yeah, I got some awesome vids saved, thanks for doing that, Rachel is so fucking hot.” My twin sister and I watched her and Rachel strip, pose and play in front of the mirror then talk about sex. I told her that I almost ruined my future sex life I ejaculated so hard thinking about Rachel. She and I went back to the sex-ed site to read about being safe without birth control. The best part of that was when the hot woman on the website sucked her man’s cock dry because she didn't want him to come in her. Nikki gagged and muttered, “Oh my god, I could never do that.”

The next sexual experiment my sister and I did was to measure my prick, limp and stiff. We watched the hot girl on the website explain that size didn’t matter as much as talent did. After the show Nikki wanted to measure me, she ran for our mother’s cloth sewing tape; she handed me the tape but I refused, “You want to know, you do it,” I told her.

“Drop your pants.”

When my pants and briefs were at my ankles, Nikki pressed the end of the tape to my groin where my limp cock started. She stretched it down, “Huh, almost five and ¾ inches.” She looked up into my eyes then started running two fingers along the length of it. In seconds she had what she wanted, my erection angled up, pointed at her. She smiled, then again put the end of the measure to my groin then ruled, “Hmm, five marks over seven,” Nikki wrapped her fingers around my boner and stroked it gently four times before she taunted, “I’m done, pull your pants back up.”

It was my turn to do Nikki a favor. She had the hots for Dante so I invited him to stay the night after a Friday night pickup basketball game. When we got home, we were hot, dirty, and needed a shower so I stripped and went to clean up, leaving my best friend alone in the room. What he didn't know was that my laptop webcam was working and Nikki was in her room watching. Dante was going to shower too, so he took his clothes off and waited until I came out. When he went in, I connected with Nikki, “Hey, you there?”

Her camera came on, “Yeah, he's so awesome, I would love to get him alone right now.”

“Well, mom and dad are too vigilant with a pretty daughter and a sports star in the room next to hers, rest assured there won't be any playoffs tonight.”

My blood stirred when she shrugged her shoulders and said, “Oh well, you're a sports star too and they don't watch you that close, so you and I can play games.” Just then I heard the shower shut off so I clicked off Nikki's picture. Dante came out of the shower with a towel wrapped around his waist. He and I talked as he pulled the towel free and dried himself. I know my half-sister must have been half nuts with lust when he took care to dry his cock and balls. Just to keep her eyes occupied a little longer I dropped my towel and ambled around my room naked before going to bed. Dante is about as well hung as me so I imagined Nikki fingering herself as she watched him. Dante went to the second bed nude and lay on top of the blanket. Our twin link was strong that night, and I swear I felt my twin sister hit two orgasmic peaks.

The next night Nikki and I were watching late-night TV, our parents had already gone to bed. My sister was focused on the movie but I was focused on her. The way she was sitting I was looking at her profile, her face, and body silhouetted by a desk lamp across the dimly lit room. As I watched her breasts move with each breath my cock started growing and a knot of shivers formed in my stomach. I was getting seriously turned on for her without any provocation by her. The longer my erection got, the bolder I felt until I looked around to be sure one or both of our parents were not lurking in the shadows then stood and pulled my sweatpants down. My hard-on bulged the front of my shorts until I pulled it through the front slot. Nikki turned and watched silently as I freed myself from the restriction of my clothes. She looked into my eyes as I sat back down and held my stiff cock in my fist. Slowly she raised off her end of the sofa then hooked her fingers into the band of her house pants then pushed them down her thighs and kicked them off her ankles. No words were spoken between us as we turned to face each other, none were needed, that night we were mentally bonded. With the soles of our feet pressed against the other’s, our knees were wide apart over the cushions. I began to stroke my erection while she plunged her right hand into her panties.

My twin and I masturbated while watching the other. She felt herself while holding me captive with her gaze. My ball pressure was building rapidly, just her eyes were stimulating me more than anything I was thinking. Nikki rolled her eyes up; her eyelids began to flutter and her legs began to twitch. My sister opened her mouth and started to gasp but clamped her lips tight and shook her head rapidly as her legs shook. I reacted to the pretty teen girl climaxing and started shooting streams of cum across the short space between us. My discharge splashed on her left thigh, spotted her panties then splotched a stain on the shirt over her quivering tits. When she relaxed on the end of the sofa facing me, she opened her eyes and looked at the thick gooey mess on her leg then put two fingers into it. Nikki wiped some cum off her leg with her fingertips then spread it on the crotch of her panties. My balls churned and my cock ached deliciously when I saw my semen clotting on the inside of my sister's leg. She puckered her lips, kissed the air between us, then got off the couch and left.

I'd been in my room for maybe ten minutes when my computer chirped, Nikki was reaching out to me. I started my video and saw her sitting at her desk topless, the nipples on her tits looked long and swollen, “That was the hottest thing we've ever done,” she started, “I thought my stomach was going to turn inside out when you came on my leg.”

“You were gonna puke?”

“No you fucking perv, I could feel it gushing inside me, I was in your head, I knew what you were thinking, and you weren’t thinking about Rachel, that's for sure.”

Maybe the twin link got stronger when our hormones were flowing, “Rachel wasn't sitting in front of me fingering her pussy, I kept thinking my hard-on should be there, not your fingers.”

My sister smiled nominally, “Too bad you’re my brother.”

“I'm your half-brother, remember, you can let me put it halfway in.” Her response was to grin salaciously and flip me the finger just before she shut off her camera.

My sister and I returned to normalcy for a few days, we fought our sibling battles, sniping at each other occasionally, and ignoring each other mostly. I came home one afternoon after practice and stripped, readying for a shower. Nikki opened my door and stuck her head in, not bothered at all that I was wearing only a jockstrap. She looked me up and down, “I’m gonna tell Rachel you have a nice tight ass.”

“Is that why you just barged into my room? To tell me that?”

She closed the door, “No, something else but if you are going to take a shower, go ahead, I’ll wait.”

I'd just lathered my legs when the shower curtain pulled aside and Nikki stepped in as naked as the day we were born, “I need a shower too,” she offered.

I stood in shock staring while my half-sister smiled up at me with some message in her eyes I couldn’t read. It flashed through my mind I was about to get fucked, and my cock ballooned immediately from useless to porn star. She watched the effect of her nearness to me then reached for my erection. Nikki was holding my cock in one hand then took my wrist with the other and guided my right hand to her crotch, she bumped her hips causing her cunt to rub on my fingers as she squeezed my hard-on. “Touch me,” she offered, then stepped her feet wide apart.

I extended my fingers and began to rub her from the top of her body crack down the curve of her pussy through her legs. She pumped my cock, pushing and pulling on it watching my balls rise and fall while she did. She sucked her lower lip between her teeth and fluttered her eyelids when I slipped my middle finger between the soft fleshy sides of her vagina, my shock melted rapidly from the heat my sister and I generated. Watching the water cascade off her bare shoulders, over the firm mounds of her tits then down the broad expanse of her stomach turned me on as much as the hand stroking my boner. This was the first time either of us had ever touched someone of the opposite sex so intimately, and the sensation of my finger on her pussy solidified my cock to steel. I bent the end of the finger and pressed carefully into Nikki, feeling for access. Her grip on my cock got stronger, the tempo of her strokes increased and she moved her feet apart, allowing me more room to finger her. Nikki stood with her forehead resting on my shoulder and her eyes locked on where our hands were. I was staring over her back and down at the swell of her ass where it rounded from her waist. I pulled my hand up and felt for that secret spot at the top of her crack we had learned about on the website. With her free hand, she took mine and guided me to her clit; I found the tender bud hiding in the soft cushions of her body. When I pressed on it, Nikki jerked her head up to look at me then her eyes slammed shut and she almost pulled my erection off. I massaged her cunt; she stroked my cock for another few moments until the pressure in my balls grew too strong. I managed to utter, “I'm going to cum Nikki, god, don't stop now!” I jammed my hand between her legs and rammed my finger into her again until my fist stopped me. Nikki exhaled a deep breath of air and began to vibrate. Her fingernails dug trenches in the skin of my erection while she shook and whimpered. My nuts overloaded and I fired surge after surge of super-heated cum at my sister, a river of semen mixed with water flowed from her stomach, through the patch of curls then down the insides of her legs.

I leaned back against the shower wall and my sister leaned against me, both of us still as statues. She let go of my cock, which was still rock hard then stood straight, put her arms around my neck, and pulled me close, hugging me, our bodies were bonded from thigh to breast. I could feel her heartbeat through her tits which were mashed on my chest, my cock was bent up between us, the end of it pressed into her belly button. She stepped one leg wide which put my thigh between hers then rubbed her groin on it. After three caresses of her pussy on my thigh my twin let go of me, stepped away, then said quietly, “I wanted to know,” then left me to finish my shower.

The dynamics between my sister and me became more intimate. For the next couple of weeks, we teased and flirted whenever our parents were out of sight. We still argued and groused over chores and who was supposed to do what but there was a lot of subtle physical contact and nonverbal messaging. Neither of us made bold advances, passes, or suggestions; but we didn't avoid bumping into each other or brief unblinking eye contact. Then one night in the kitchen while Nikki was cleaning some pots and pans at the sink, I stepped up behind her, put my arms around her stomach, my chin on her shoulder, and asked lightheartedly, “What are you doing?”

She bumped her ass against my groin, “Thinking.”

“Bout what?” I pressed my hips forward pushing my pelvis against her, her stomach pressed against the edge of the counter. My cock started to swell.

“We should go back to that website, we'll be 18 in a few weeks so I want to read more about what a girl can do to turn a guy on while dating, I don't want to be too forward, but Dante is going to get lucky.”

“You’re planning a lucky fucky?”

Nikki twisted her head to look at me, “That's too Asian, how about, with luck, a fuck?”

I dropped my hands to her waist and held her while I rubbed my erection across her butt, she flexed her hips slightly to get a better feel. Encouraged by her move I lifted her skirt, slid my hands around and over her panties, and put them between her legs. Her crotch was hot which warmed my cock even more. When I began to rub her through the fabric of her panties, she inhaled a sharp breath and moved her feet apart.

She focused on something outside the window over the sink while I eased a finger into the leg of her underwear and rubbed the tip of it through her hair to the soft pillows of her pussy. Nikki shook the dishwater off her hand, reached behind her, between us, and gripped the bulge of my erection. I fingered her lightly as she stroked my cock. I moved my hand higher, searching for the clit she showed me how to touch in the shower. Her entire body trembled when I pressed the button at the top of her swollen slit. Nikki let go of my prick then fumbled blindly for my zipper, when she found the tab, she pulled it to the stop. Her hand reached into my open fly but my underwear was keeping me from her. I moved my left hand from under her skirt and managed to pull my erection out of my shorts, Nikki immediately grabbed her prize and stroked it. I bunched the back of the skirt up until there was nothing between us but the thin material of her panties. I pulled her hand off my hard-on, bent my knees then put it between her legs. Nikki gripped the edge of the sink with both hands and bent her ass back, creating even more pressure between us. I rolled my hips causing my cock to rub over her cloth-covered crotch, she trembled again, lowered her head, and sighed softly. She lifted her head and reminded me quietly, “Mom and dad are here.”

“They’re watching TV.” Nikki sipped a soft breath and pressed her ass against my groin.

The time between our shower together and what we were doing, served only to allow my balls to overflow with lust. I jacked off a few times, but just hanging around Nikki and remembering the shower kept my nuts full. Stroking my sister’s crotch with my erection was quickly changing from a spur-of-the-moment event to a sexual imperative. When Nikki reached between her legs and pressed my cock tighter against her body I boiled over, my cock seized, cramped, then convulsed. I fired a series of long hard surges; cum covered her hand and soaked the crotch of her underwear. When she felt that I had finished spraying she stood straight, turned around, looked me in the eyes, and scolded me, “You’re a fucking pervert.” She watched as I backed away and tucked my still stiff erection into my pants, when I was properly dressed again, she said, “You owe me,” then turned back to finish her chores at the sink.

We didn't surf the Sex-Ed site that night and for two more days we behaved ourselves. The next Friday she was hanging with Rachel and Shandra until 10 or so when she came home. I followed her home about a half-hour later. Five minutes after I got to my room my laptop cheeped; Nikki was hailing me. When I clicked on her icon and the picture came up, all I could see was a tan-colored plastic prick in my sister’s fingers. It was shaped like a real hard-on, with requisite plastic balls. We'd read about dildos on the website but I still asked, “What the hell is that? Did you buy that?”

Nikki ducked her head so I could see her in the view, “Shandra gave it to me, she says her mom had like a dozen or more so she stole this one for me. Rachel got one too, but it's red and doesn't have nuts.”

“Why did she do that?” Shandra was another fantasy of mine, a black girl, almost as tall as me with awesome basketball moves, and an even more awesome basketball-shaped ass.

“We were looking at dildos on the website and Shandra asked if Rachel and I had ever played with one, we didn't, so she got these and said we should try them.”

“Shandra plays with fake pricks?” Just the thought of her with a toy shot a shiver of desire to my cock.

“I guess so, she sounded like she knew what she was talking about.”

“And you? Are you going to put that in your pussy? I wanna watch.”

Nikki paused then asked, “Where are mom and dad?”

“They went bowling with Margie and Ike.”

Nikki glanced at her watch, “That means they won’t be home for another hour or so,” she smiled marginally, “come over here?”

I'm not sure what ingredients it takes to grow instant hard-on, but when my half-sister asked me over, my cock exploded so fast it hurt. Thinking she had invited me to watch her use a dildo it took only seconds to get to her room from mine. She was standing beside the bed taking her skirt off when I came in. The skirt hit the floor and she started on her blouse, “Take everything off Dalton, we have to be naked, or else I won't try it.” I was shaking so hard I could hardly make my fingers work the zipper and buttons. Eventually, Nikki and I were facing each other, her nipples were sticking out almost as far as my prick. She grabbed a plastic bag off her nightstand and pulled a tube of something out of it, “This is supposed to make everything slippery,” then she dropped it on the bed. My sister laid on her back and patted the mattress beside her, I sat next to her, her hip lodged firmly against mine. She picked up the dildo and handed it to me, “You do it.”

I sat next to my nude sister lying on her back on her bed and almost shot a load right into her face; I fought against the cramps until my balls settled down again. Nikki was watching me carefully, her breath rapid, her lower lip sucked between her teeth. We had watched the guy on the computer use a sex toy on the hot girl, so I mimicked his moves. I took the dildo and pressed it lengthwise against the swollen folds of my sister’s split. She shivered from head to toe, shifted her butt a little, and spread her legs. When I started rubbing her with the plastic cock she closed her eyes and rolled her head to the left. She let me play between her legs for a minute or so but reached down and stopped my hand, “I’ll get sore, use that lube stuff.” I looked around for the tube, took off the cap then squeezed a glob of clear gel onto the end of the dildo. When I had it about half coated with the slick goo, I reached between my sister’s legs and smeared the residue of jelly from my fingers to her pussy. When my hand touched her, she jolted and humped her hips while her eyes rolled up and closed. I used the excuse of smearing her up to fondle her, and she didn’t seem to mind.

I put the end of her new toy between the sides of her slit and slid it up and down, using the end of it to caress her body from the top of her crack to her asshole. She took a deep breath and widened the gap between her legs, then with both hands spread her cunt open so I could see the little hole. I took that move as an invitation to put the plastic prick into her. I leaned over my sister's thigh to see what I was doing then pushed the head of the dildo between the folds of her pussy and into the hole. I pushed in about two inches then pulled it back. I repeated the motion and in moments Nikki was getting short fucked by a fake cock. I was careful not to jam it into her even though my hormones were screaming for me to do that. Her breasts were rising and falling with quick breaths drawing my attention to them. I couldn’t resist, I reached with my free hand and cupped her left tit. She slapped a hand over mine and pressed it against her body even more, encouraging me to feel her up. I sat beside her, two-inch fucking her with the dildo and playing with her tit, getting bolder as the minutes flew by. Nikki began to roll her back, undulating on the bed, she reached between her legs and pulled my hand off her plastic lover, then took over from me. Her hand nearest me fell to my lap and captured my aching hard-on then my sister began stroking my cock in sync with the dildo stroking her cunt. She began to gasp and moan; I'd seen her climax before so I knew she was peaking. I put my hand on her pelvis, covering the mat of hair, then searched for her hot button while she pumped her pussy. The pressure of my thumb on her clit set her off. She arched her back and cried out sharply as her heels made dents in the bed. She squeezed my cock so hard I thought she was going to break it off.

She fell back to the bed and pulled the toy out of her then sat up and pushed me to my back. Her eyes were wild, feral with unsatisfied lust, “Warn me,” she demanded then bent over my lap and put her mouth over my throbbing erection. I was stunned by what she was doing, I never, ever even imagined getting a blow job from my sister, but she held my cock in her hand while mouthing the end of it. The growing ache in my balls was the warning so I put my hand under her chin and pulled her off my cock just as the end of it shredded. I came in long ball-draining rushes all over her hand and stomach, cum dripped down her arm making a large wet spot on the bedsheet.

She fell back to her pillow as I laid a leg across her thighs, “Holy shit girl, we just did some really hot fucking stuff.”

She moved her eyes from the ceiling to mine, “I can't wait to be 18, Dante is so going to get raped two minutes after midnight.”

I dipped my fingers in the viscous fluids puddled on her skin and smeared it into her belly button. Her tummy fluttered as I tickled her. I eased a finger between her legs again then painted cum on her slit with my fingertip while she rested. I sat up, “They’ll be home soon, I have to go.”

Nikki looked at my nudity, my half-stiff cock then said, “Not yet, I want to do something, and I want you here,” she slowly trailed her fingers across my ball sack. Her touch sent surges of hormones through me. My cock reformed as an erection but that wasn’t what she was looking for. She picked up the dildo then rubbed it in the biggest glob of semen on her stomach then put the end of it back into her body. She took my near hand and placed it over the plastic nuts, hers covered mine, again I knew what she wanted. Nikki looked at me with solemn eyes then she nodded. Together we jammed that thing into her hole until the balls were squashed against her. “Ohhhh, damn!” she cried as tears formed in her eyes. My sister once again surprised and shocked me with her sexuality and boldness by destroying her little girl. From that moment on she wouldn't be able to say she was a virgin, technically at least.

Things cooled off considerably between us. We stopped flirting, sneaking feels, and playing for the cameras. For several weeks it was as if wrecking her virtue was the final plateau in our sexual adventures, there was nothing else to try. Four weeks before our eighteenth birthday the house was buzzing with plans. Our parents were preparing for a big party with half our school invited, then afterward we would be free to roam the town. My half-sister and I were making plans because we could start dating after the big day. I'd already asked Rachel out and Nikki was bugging me to get Dante to ask her. It was a Friday night; I had been flirting with Rachel over the internet and after we signed off, I was ready to take a shower when Nikki tapped lightly on my door and stuck her head in, “Hi.”

“Hi back, what do you want?” I was peeling my clothes off.

“You going to bed?”

As I peeled off my briefs, I told her, “I have to clean up first.”

“I'll come back in a few minutes, I want to look something up on the Sex Ed site.” It struck me how casual we were being, her in my room while I paraded around in the buff, and our parents in the front room watching a Netflix movie. She left and I went to shower.

Ten minutes later she came in wearing a short, pastel yellow nightie. Her long shapely legs were bare almost to her crotch, I could see a hint of dark nipples through the thin material over her tits, and brief black panties begged my attention. I was sitting at my laptop with just a towel around my waist, I had already logged on to the site, “Did you wear that for my entertainment?”

“No, you perv, it's comfortable, move over.” Nikki nudged my hips with hers then sat next to me on my chair, the smooth soft skin of her thigh caressed mine below the towel.

“What do you want to look at?”

“Not sure, I'm just not in the mood to sleep yet.”

“Then what mood are you in, what do you want to see?”

Nikki looked at me for a few seconds thinking, “Don't know, you choose.” I clicked on 'Fellatio' and went straight to blow jobs. Since Nikki had tried that once with me, I was kind of hoping she might be influenced to do it again. We read about fellatio and how useful it was to get a guy ready to fuck and that it was a good substitute for the man when the woman couldn't have sex because of pregnancy worries or menstruation. Again, I skipped over gay guys sucking, but stopped to read up on oral ejaculation and cum swallowing. My towel was beginning to tent over my lap as my sister and I watched the hot girl sucking the hot guy’s dick again. Unlike the first time we watched, Nikki didn’t gag after he got off and the girl cleaned the cum dripping from her lips. The last part of the video suggested we read up on 'Cunnilingus' next. Eating pussy.

Nikki had sucked on my erection once but I hadn’t returned the favor. I didn’t know what she tasted like between the legs but the longer she sat beside me, the more my mind and body focused on her. The man had his head between the hot woman’s legs, licking and kissing her pussy while she flexed and curled her back, crushing her pussy against his mouth. About the time she began to moan and gasp for air I reached around Nikki's waist and urged her to stand. She stood and I pulled her around until she was facing me. I reached for her panties and pulled them down to her ankles where she lifted her feet from them. Her butt was resting against my desk when I lifted off the chair, pushed it away then dropped to my knees. I put my hands on her legs, pulled them apart, and put my head under the hem of the short nightie. I kissed my sister right at the top of her cunt, her pubic hair felt silky under my lips and tickled the end of my nose. Nikki twitched a little then rested her hands on my head while I inhaled the sweet fragrance of her musk mixed with cologne. I kissed her again then put the end of my tongue on her and licked the moisture from between the lips of her body.

Nikki grunted, “Huuuhh,” then rose on her toes while arching her back which thrust her pelvis toward me. I bent my head back as far as I could trying to get my mouth completely over her pussy; never in my life had I ever felt anything so intensely sexual as I felt just then. I wanted to do anything and everything I could to her, the taste of her body and the slickness of her pussy was causing my erection to convulse, my balls were steel. My neck was kinked so I pulled away and she reluctantly let go of my hair. I stood then took her hand and led her to my bed and pushed her down so she was on her back, knees bent over the edge. I went to my knees again and put the end of my tongue into the pocket where her clit resides. I tapped on her button with my tongue then started flicking it rapidly. I lapped my sister and she got so fucking turned on that she had to smother herself with my pillow to keep her panting and whimpering from alerting our parents. Nikki's whole body was bucking, her thighs squeezing my head while I licked the seeping fluids from her. She pulled her feet up and put them on the bed next to my head and began to gasp, trying to catch a breath. I looked up at her face just as she took off on a flight of rapture, the intensity of the orgasm cramped her muscles, freezing her body as the climax quivered from my mouth through her clit, then overwhelmed her completely. She relaxed flat on the bed, her chest heaving for air, eyes locked on me. The look was awe mixed with confusion; awed that she could feel that good, confused that her brother could make her feel that good.

I stood between her legs, grabbed my erection then with no hesitation put the end of my cock into the dilated hole of her sex. I pushed the head of my prick into her then paused to watch her reaction. She didn't cringe, she didn't resist, she didn't move; she just laid there and let me push deeper and deeper until the soft swells of her cunt were cloaked by my pubic hair. I leaned over and put my hands beside her head then rolled my ass. She reached up and gripped my shoulders, her nails were marking the skin as she began to roll her stomach while I thrust and pulled in and out. My balls couldn't handle the intensity of the moment and gave up trying so just a couple of minutes after putting my cock in a girl for the first time ever, I began to cramp. I pulled out of her and started shooting bullets of cum on the nightie covering her stomach and tits. The last shot splashed directly on the lips of her pussy. Nikki and I were born together, we grew up together and we had just lost our virginity together.

I should have felt shame. I should have felt embarrassed. I should have felt guilt. What I felt was awesome! I had finally gotten to fuck a girl and the lingering sensation of the hot, wet tenderness that briefly enveloped my erection wouldn't let my ardor die, I remained stone-hard as I stood before her. Nikki pushed up on her elbows, looked at the mess on her nightie then lifted her hand, I took it and pulled her up. She came straight up into a full-body hug with me, our bodies meshed from thigh to thigh, breast to chest. My hard-on was trapped between our groins, the cum on her stomach smeared onto mine. We clutched tightly for a few long seconds then she pushed away, smiled modestly then whispered, “You have to stop doing that.”

Expecting her to say we'd finally gone too far I asked, “What?”

“Every time you get off around me you mess up what I'm wearing and I have to hide it from mom who is always looking for laundry. You don't have to explain sex stains in your bed or underwear, but I would have a hard time convincing her I had a wet dream.” Her eyes flickered with amusement then she turned and left my room. When my sister was only a pleasant memory, I picked up her abandoned panties and put them under my pillow. I lay in my bed and fucked her a hundred more times before sleep took me. I think what I thought about most was the fact that she didn't reject me or object to what I did. We had been building up to the act for months, everything we did and said was foreplay, and when the time was right, she was as ready as I to consummate a physical relationship.

The final barrier had been breached, I fucked Nikki and she didn't try to stop me or wasn't upset or concerned about what we'd done. Every Saturday our parents left the house early to go golfing so around 8:30 my sister and I were once again alone. I had no reservations about grabbing a condom and going to her room, my cock swollen with anticipation. I was wearing my bathrobe, when I went to her, she was standing beside her bed wearing a nightshift. When she saw me, she smiled softly, turned to the bed then leaned over it, putting her elbows on the mattress. When she bent, her gown pulled up her legs far enough to give me an unhindered view under it. She wasn't wearing panties so my eyes locked onto the lips of her vagina between her legs. Nothing was said, nothing needed to be said, that morning our twin link was powered by boiling hormones and working strongly, and I knew without any doubt that she had been waiting for me. I opened my robe then stepped up behind my sister, put the end of my erection between the tender lips of her sex then pushed into her until my groin was rubbing on her ass.

I held her hips while plunging in and out of paradise until she stood, forcing me out. She pulled her blankets down then pulled off her gown while I loosened the sash of my robe and shrugged it to the floor. Nikki looked me from face to hard-on, smiled then laid back on the bed. I got onto the bed beside her and immediately bent to kiss her breasts. Nikki grabbed my hair and moved my head so my mouth was where she wanted it. As I suckled her tits, I moved a hand between her legs and started rubbing her crack just as I did in the shower. I felt the lips of her body swell and open like a flower to the sun. She was rolling her back, causing her hips to bounce against my hand, the slit I was feeling was getting slick with moisture seeping over my fingers. Nikki spread her legs impossibly wide then pulled on my arm to move up and over her. She grabbed the end of my cock and slid it through her pubic hair then up and down her body crack; she adjusted it until the head slipped into the hot tender hole. I pushed down, into her. Nikki put her hands on my shoulders, pushed me up then looked over her stomach at my erection as we started to fuck.

We were hot, eager, and inexperienced, so as we slammed our bodies together, we couldn't get a rhythm, I kept pulling out of her and stabbing the mattress, and she kept putting me back in. Gradually, by mutual unspoken accord, we slowed down and began to synchronize our movements. My balls were tight against the base of my cock when she reached over my ass to touch them as we fucked. Impelled by the nature of what we were doing I leaned down and put my mouth on hers and kissed my sister sexually for the first time. She moaned into my mouth, her fingers squeezed my nuts and her legs started shaking. Nikki twisted her face from me, arched her back, and gasped deeply, her cunt was getting hotter and wetter as she vibrated and fought for breath. My cock cramped hard and I started surging into the depths of my half-sister. It wasn't until after we quieted, lying face to face that I realized I had cum in her and we hadn't used the condom, I picked it up from where I'd put it and exclaimed to my sister, “Fuck, I forgot about this!”

Nikki put her hand over the fist holding the package then smiled contentedly, “We'll use it next time.” She seemed a lot less concerned than me that I'd just done my best to impregnate her. She rolled to her back and extended her arms over her head, her back arched off the bed, her heels made dents in the mattress. I was fascinated by her breasts which floated softly while she stretched. Nikki collapsed back down with a large sigh and smile then bounced up and over until she was lying on me, face to face, stomach to stomach, groin to groin. “That was fun, can you do it again?” She pushed up off my chest until she was sitting on my cock which was still hard. She rolled her hips, sliding her cum saturated pussy on my erection then lifted off far enough that I could hold it up for her. She rotated her butt until the head slipped into her then I thrust up until our bodies meshed. Not ten minutes after I emptied my balls into my sister for the first time, we were engaged in another heated encounter.

I don't have an accurate internal clock, and I didn't bother to look at the one on my sister's nightstand while I fucked her, so I couldn’t tell you how long we bumped and ground our bodies that second time on her bed. I can tell you that the longer we coupled, the more aroused we got. Nikki's excitement elevated in stages, from quiet enjoyment through hot passion to the apex of her endurance. She was mewling softly, crushing her hips against mine each time I plunged into her, she put her hands on my hips, gripping me tightly as we fucked. I was watching her mouth, spellbound by the contortions of her lips, her eyes were focused on nothing when she froze solid. Nikki quit moving for moments then her thighs began to quiver. The climax radiated from her legs across her stomach and breasts then escaped from her as a soft, pulsing song of rapture. My sister's orgasm set my own in motion and again I gushed repeatedly into Nikki's deep tender cunt. I pulsed so hard and rapidly I thought my nuts were moving in to live with her.

Maybe the hardest thing I had ever done in my life was to get off my sister’s bed that morning. I was ready to stay with her until sunset but we had other plans. I must have apologized a dozen times for not using the condom but she assured me that she was okay. According to her calendar and the Sex Ed advice, she was about as safe as she could get without protection. She did grumble about me messing up her stuff again, she would have to wash the sheets and her nightgown before our parents came home. Later as I was leaving the house, I pulled Nikki into a long hug. We held each other silently for several moments then I kissed her lightly on the lips, “That was awesome.”

Nikki smiled up at me, bumped her groin on mine, and returned, “Yeah I liked it too.” I spent the rest of the day with a semi-hard dick as my mind thrived on what we'd done.

We became lovers. Every time my twin and I were alone for more than an hour we fucked like crazy. We logged on to the Sex Ed site then mimicked the moves and positions we read about and watched. We became frequent visitors to the free condom box because rubbers had a very short shelf life in our rooms. One afternoon after basketball practice I was in the shower when my sister stepped in to join me. Since we started fucking, she and I showered or bathed together often, screwing in warm water was always an exciting experience. We were still learning, still doing new and different things to turn each other on, so after getting a long, strong, boner I stepped out of the shower and threw all the towels I could find on the floor. I pulled her out and told her to lie down. Nikki was looking up at me from the floor when I went to my stomach between her splayed legs and put my mouth on her pussy. I ate my twin, I lapped her cunt with my tongue, I tickled her clit with my nose, I made her so hot to fuck she was gasping, “God Dalton, I'm burning up, oh pleeease ----!” The taste of her tender body lips, the sweet nectar seeping from her caused my nuts to become hot and solid, I was fucking the floor between her legs when Nikki floated away on a cloud of passion. Her entire body was vibrating as she wailed her release.

As soon as her ass relaxed back to the towels I got up and sat across her stomach, my balls were resting on her belly button, my erection hovering over her tits. I leaned forward and put the end of my cock in the space between her tits and started humping my ass, rubbing the head of it on her skin. Nikki caught on quickly and pressed her tits together so I was fucking them. She was watching the head of my hard-on slipping in and out of sight while I stroked between the soft mounds of flesh. I tit fucked her for a minute or so, then raised up and pushed further until the end of my cock bumped her chin. Nikki opened her mouth and let me penetrate her lips. She'd sucked my cock a couple of times so she wasn't surprised, she let go of her breasts and grabbed my erection with a hand, and began to mouth me. I pumped over her tongue with ever longer strokes until she managed to plead, “Not so far.” I stretched up and over her face while she suckled my prick for another few moments then all hell broke loose. My cock seized, my stomach convulsed then I began to fire bullets of hot cum into Nikki's mouth, something I’d never done before. I fell off to her side when I was done pulsing, panting like I had just run a marathon. Nikki rolled to her side then let my cum dribble from her mouth to a towel. After she wiped her lips and chin clean, she looked at me, “Wow, I didn't gag or puke and I know I swallowed some.” I chirped a short laugh, rolled her to her stomach then pushed two fingers into her and hand fucked her until my cock was strong enough to use again.

Our 18th birthday was one we will never forget. In the weeks before, not only were my sister and I fucking like sex-starved prisoners just released from solitary, we were breaking other rules and sneaking dates with Dante and Rachel. By mutual accord she would go somewhere with Rachel and I would show up with Dante then we'd pair up and 'double date' for a while. It didn't take long for Rachel and me to become heavily involved in heavy necking and petting, she promised to give me my birthday present between bed sheets. From the conversations I had with my sister when we were alone, I learned that she and Dante hadn't been able to hold out that long. Nikki let my best friend get her into the back seat of his car eleven days before the Big Eighteen, she was a bit surprised that Rachel and I were still restraining ourselves. “Stupid fuck, she wants to screw you so bad; just go for it, she won't hold out.”

Rachel and I did hold out until after the birthday bash. We went to her house because her mom was on a date with some guy so we were alone. We didn’t fall into each other’s arms immediately; we stood apart watching each other while pulling our clothes off. Rachael was blushing from face to thighs but she wasn’t hesitant. When she was nude, I pulled her into my arms and held her tight as we kissed. We made out only a short while because our need was way more than something a few kisses could quell. She backed up to the bed then lay down, pulled her knees up, laid them wide to each side then invited me to screw her by murmuring, “Don’t make me wait anymore.”

The head of my erection slipped easily into the hot wet hole between her legs. When my balls mashed against her Rachel wrapped her long legs around my thighs, inhaled deeply then sighed into my ear, “Do anything you want with me, do anything you want to me; Oh! I've waited too long!”

I fucked that girl in a body-slapping frenzy but since I had screwed Nikki twice the night before, my stamina and endurance were working in my favor. After a few minutes of rolling around on the bed between her legs, I slipped out of her and started exploring her body with my mouth. I kissed and licked her from lips to stomach while she whimpered softly and undulated under me. When I rested my head on her pubic hair the scent of her arousal shot a wild, uninhibited yearning through me, my cock flexed even stiffer and I bent my head, put my lips at the top of her vagina, and kissed her. From there it was as natural as breathing to lick and suck on her sex. She arched off the bed, grabbed her hair, and started huffing when I put my hands under her butt and held her close as I tickled her pussy with my tongue. Rachel rapidly climaxed twice while I had my head between her legs then she rolled to her stomach, pulled her knees up, and offered me a piece of heaven. I slipped a condom on my erection then slipped back into Rachael and finished enjoying my birthday present.

It was past two in the morning when I got back to my room. I had just gone to bed when my door opened and Nikki crept in. She lifted the covers then joined me on the bed, “Did you like her?”

“What are you doing here, mom and dad might hear.”

“Shsss, don’t be so fucking loud, did you fuck Rachel?”

“Well, yeah, we got it on three times.”

Nikki scuffled under the blanket while stripping off her nightgown and panties then rolled up until she was lying on my stomach, “Tell me about it, what did you do with her?”

I pushed my twin half-sister up so I could pull my shorts off then pulled her down so I could put my swiftly growing cock between her legs. When I was stiff, she moved her pussy until I penetrated the hole filled with Dante’s cum. We screwed softly and told each other how it felt to fuck our dates on our eighteenth birthday.

Epilogue:

After we graduated High School, Nikki and I eased away from our torrid sibling fuckfest, and resumed a normal brother-sister relationship. She dated Dante for another year then moved on to other lovers, I broke up with Rachael when she left for a different college. I found other outlets for my libido, including Shandra, the half-black girl. She is an awesome, wanton sex partner, and we've been off-and-on lovers for years. It's been ten years since Nikki and I last screwed each other, she's been married six of those. I'm not married, but I'm not lonely at night unless I want to be.

Nikki called me two days ago with a question, “Did you ever think I was cheating on you when I was dating Dante?”

“What the hell kind of question is that? You might have asked that ten years ago.”

“Maybe, but I didn’t.”

I paused to think, “No, I never thought like that. I mean you're my sister, we couldn't cheat because it's not like we would get married or something.”

“So, because we are siblings what we did wasn't cheating on each other, or the others?”

“I guess not. Are you feeling guilty about all that now?”

Nikki's voice dropped to a low husky whisper, “Can I come over tomorrow? I've been thinking about us, what we did and I want to talk.” It had been years since I'd heard her voice like that, and the noncommittal words masked a hidden message, my sister sounded like she had more than talk on her mind.

I almost groaned my cock solidified so fast. My half-twin was offering herself to me again and I knew I wouldn't fight the feeling, “I'm supposed to meet Shandra tomorrow.”

I heard Nikki smile as she confirmed her purpose, “Don't worry, you won't miss her.”

I watched as Nikki pulled into my driveway, when she opened the door of the car and twisted her legs to get out, I got a great view of her shapely thighs under a short skirt and my prick flexed with memories. I met her at the door with a goblet of red wine which she took with a smile. We sat in my front room and passed the minutes with small talk, there was no need to run to the bedroom, we felt no rush to screw. She finished her wine, set the glass down then looked at me expectantly; I stood, offered her my hand then led her to my room. We stopped by the bed and faced each other, then without saying anything we started taking our clothes off. She undressed to panties, I stopped with my erection distorting my boxers. Nikki stepped into my arms and in a flash ten years of separation vanished and I felt like I did when we were 17. I pushed her panties off her hips and down her legs, after she stepped out of them, she pulled mine down and off. I pulled her to the bed where she went to her back and I moved up and over her. Our lips met just as the head of my erection slipped into the warm inviting center between her legs.

After a few minutes of re-introduction, I pulled out of my twin and reached into my nightstand for a condom, but when she saw what I was doing Nikki grabbed my arm to stop me, “We don't need that.”

“You're on the pill?”

“I was.”

“Not now?”

“No, Martin and I want a baby.”

“Then I better use this.”

Nikki pulled me back into position between her thighs, “Don't worry about it, right now I want it all, 100%.”

“But----”

She didn’t let me finish, she pecked me on the lips, her eyes flirted naughtily then she bumped her pussy against my erection, “We’re only half-blood related, so if you knock me up it probably won't have crossed eyes.” My balls tingled delightedly when I pushed my erection back into the most sensational warm, wet environment I had ever enjoyed.

-->