One morning I went over to a friend's house just to hang out, and after a while his parents went out so we were alone. I was on the couch and he was in the recliner in just a t-shirt and boxers since it was a Saturday morning. It wasn't too long before he switched over to a movie that he had recorded in the middle of the night and it wasn't much more than a porn movie with a bad story. After watching it for a few minutes I started glancing over and the tent in his boxers kept growing, and he kept fidgeting around because of it. He stayed that way for maybe 10 minutes before he said 'OK, I can't stand it anymore.' He then stood up and dropped his underwear and kicked them off, his penis sticking straight out. He then sat back down and reclined with his legs spread apart and said 'oh yeah, that's better.'
We watched for a little while longer and his erection wouldn't go away, so he did what anyone else our age would do, he slowly started stroking while his eyes were locked on the screen. Just the fact that he was masturbating in front of me got me just as hard as he was, so I asked him if he minded if I jacked off too, and he said to go ahead and the tissues were behind me. I started stripping down but I went a step farther, getting completely naked since I don't like wearing clothes when I masturbate. Since he started before I did he came first, grunting and just letting it shoot, getting cum all over his shirt and his hand. Seeing it sent me over the edge too, just getting the tissue wrapped around my cock before unloading into it.
It was the first time I masturbated with someone else and it was one of the biggest loads of my life. I milked it out and went to throw it away and when I came back he was still sitting there, hands behind his head and still wearing that shirt. I asked him if he was going to clean up, and he said not yet because he probably wasn't done. Sure enough, maybe a half hour later he started growing again. This time he didn't ease into it, he started stroking hard and fast, almost desperate to cum. I tried to go again but I couldn't get hard so soon after, so I just laid back and watched.
It took a little longer but then he started breathing heavy, his toes curled down and came a second time. By now his shirt was an absolute mess so he pulled it off and said we should go upstairs before they get home. We gathered up our clothes and went up to his room, just hanging out naked for the rest of the morning before his parents came home, then threw our clothes on quickly and they never knew what went on.