I was at my all boys school. I was in a darkened lecture theatre watching a historical movie as part of an English literature course. A boy moved along the bench seat and came next to me. Next moment his hand was on my thigh. I'd discovered masturbation by then and I'd heard of boys doing it for each other so I knew exactly what he wanted. I spread my legs to let him know I was interested. I let him unzip me and after some fumbling he got my cock out. I was hard up erect. Then he wanked me with just his thumb and forefinger. It was exquisite! When I came my semen fountained over my clothes. He got his own cock out and I had a feel but I was too concerned with wiping my own semen up so he wanked himself. But a couple of hours later we were crammed together in a school toilet cubicle with our trousers and briefs down jerking each other off.