MORNING SINS part 2
I could not contain myself. During gymn class I had to slip away into the toilets and jerk off. I hurriedly pushed down my shorts and jock strap around my ankles and sat down on the toilet. The others were out in the gymn and I would not be disturbed. I conjured up my sister Natalie in my mind. She was decked out in her school uniform--short sleeved white blouse, plaid skirt, white knee-high socks, and casual dress shoes. As I envisioned her my mind her blouse was open more the school allowed...