On a crowded bus, the big ass of the woman in the mini-skirt next to me is rubbing against my crotch. I involuntarily get an erection and in the process, her mini-skirt rides up, revealing her panties with my dick pressing against them. The woman notices and, flushed with shame and arousal from the hard penis, starts gripping it. When I touch her crotch, of course, it's wet, so there was no choice but to insert it.
