This happened a while back, but I remember it clearly
I was about seventeen or so, and my friend (I'll call him Karl) was a couple of years younger. He was not really my friend, more of an acquaintance. His mother and my mother were good friends. Karl was not too interested in school. He just barely got by, and his parents were having a hard time getting him to pass this algebra class. I was pretty good at math, so they asked me to help him with a refresher course he was taking on the internet.
So I would go over twice a week after school to help him. His mother and father both were away at work until early evening, so we were alone at the computer. At first we worked at the problems pretty hard, and he seemed to be trying to learn. But after a few sessions he got less and less interested, and would take more and more breaks.
Well, one time while I waited for him to get back from the kitchen or somewhere, I decided to while away the time on a porno web site that I belonged to. I got real interested in what I was watching, real hot orgy action with girls on girls and guys on guys doing all kinds of far out sexual things. I did not notice that Karl had returned, and was right behind me watching the pornos too. I looked back and saw on his face that he was really into that stuff also.
I told him to sit down and watch with me, and he did, still not saying a word. Well, by this time I was really hard and horny, with the porno and this young guy right next to me. So I started to rub my cock through my pants in plain view of him, then I told him to do the same, which he quickly did. Then I wanted to take this a little further, so I asked him if he would mind if I took my cock out and played with it. He said no problem, and as I did he took his out too.
Well, we jacked ourselves for a while, then I reached over and took his hand away and told him I wanted to jack him off. He was a great follower because then he did the same to me. By that time we were both ignoring the screen and looking intently at each others cock. In no time at all he came, real hard, lots of cum all over his lowered pants and the chair. I followed with my eruption right after. It was the most intense orgasm I had had in a long time. Karl had the most beautiful cock I had seen, not too long but very thick and warm. We just looked at each other and smiled. We made this ritual a regular thing, most of the time jacking off before we started studying.