My freshman roommate was a great guy. One night about a month after school had started Cam and I ended up in a threesome with an incredible girl. It was the first time I had ever had group sex, or seen another guy hard before, and it was a really hot time. After we both got off, she left and we got in our beds, and started reliving the whole dream like event. One thing led to another and we started jerking off talking to each other about what we had just done. Cam got up off his bed and went and grabbed some lube, and was squirting it on himself at the sink rubbing it up and down. He came over to my bed and squirted some onto my dick. His dick was right above my head as he was bending over, and it looked really massive jutting straight out. I dont know why, but I reached up and ran my hand up the shaft and down. Cam reached down and rubbed the lube into my dick, and we jerked each other for a couple of seconds. Cam commented on how good it felt, and I agreed. He asked me to slide over and he lay down next to me, and we started jerking each other off.
We stroked each other for a long time enjoying the feelings. As Cam started to get close, he stopped jerking me and started to furiously rub and pull on his nipples, he let out a short grunt, then shot onto his stomach. He quickly reached over and started jerking me fast, and the sight of his cum dripping down his belly sent me over and I came too.
After that night, we openly jerked off in front of each other, and every once in a while would repeat the mutual jerk off session. While we never got another threesome, it was generally the discussion when we would get each other off.