Crowded Train
Without moving at all, we were fucking each other. Her cunt was rhythmically squeezing my cock. The vibration of the train was buzzing up through the base of my shaft into her, and every bump drove me a little deeper. I had to bite my lip to keep from moaning so I didn't draw the attention of the other passengers. We were fully clothed and she was sitting on my lap, facing away from me, pretending to look at her phone. Her skirt was spread over my legs, which kept us from being too obvious, but...
Exhibitionism