The masturbater
Mark had become an expert surreptitious masturbater, he could do it at the drop of a hat and not bat an eye when he blew a big load of cum in his shorts! It started when he was about eighteen years old when he found that if he went into the closet in his bedroom, he could watch his older sister by looking through a crack in a common air vent. Being nineteen years old, Mark's sister had a much more developed body than any of the girls in his own class. Sarah wore a 34C cup bra {Mark knew because...
Masturbation