Ok when I was a senior in high school and I was single so with that said I jerked off a lot.
So one time in ss class we were watching a video and I got really horny because I saw down my ex girlfriends shirt, and saw her full tits, nipples and everything. It also didn't help that the two girls sitting at my table in the back corner of the room (so the only people that would see me are the people at my table) were not wearing bras.
So being 18 seeing what I had I got daring. I thought (before I got hard) I would kinda slowly get it out of my jeans and hide it with my sweatshirt. But as soon as I got my views I got hard in an instant.
So getting gutsy I got my dick out and hid it with my sweatshirt, but being hard it was kinda hard to do. So making sure the girl next to me didn't notice I slowly stroked my cock through a soft long sleeve shirt I was wearing.
Looking at these girls while masterbating was great and so I picked up the pace a little. God it felt great with that shirt and the view and the things I was thinking. Just thinking about jerking me off themselves or giving me a blowjob quickly.
After a while one of the girls crossed her arms under her breasts, which almost sent me over the edge. Then I saw the other girls breasts bounce while she moved in her chair.
That was it, I came on my shirt but I quickly covered up all the mess with my sweatshirt. Luckily this was the last class of the day, so I bolted out of the room as fast as I could and got my homework and went to my car. I drove home and thought about it all over again.