When I was in college, I had a neighborhood friend Rich that was a couple of years older than me. I was friends with his family (I actually had the hots for his younger sister). I kinda thought he was gay from the way he acted and some of the things he'd say, but he wasn't "out" yet. We all called him Big Rich because not only was he tall, one time while skinny dipping in the lake we all saw his cock and it was absolutely huge, at least compared to ours. The nickname stuck i guess.
Rich's parents went away one weekend, and we were bored so we decided to hang out at his house. There was nothing on tv, and Rich suggested a porno he had gotten his hands on. It was straight porn, and as we were watching, he started to rub himself, so i started rubbing myself. He pulled his cock out and started jerking himself slowly. His cock was a man's cock, thick and long. I've played with guys a bit here and there, so I was no amateur, but I didn't want him to know that. He said go ahead, so i did the same. The porno got hotter with lots of sex and fucking, and we were stroking our cocks furiously. Rich suddenly stopped and said if he kept it up, he was going to cum. He told me if i had to cum, to go into the bathroom and cum in the sink. I stopped and my hard on was upright like a flagpole.
After some time, Rich asked if I ever touched a cock before, and i lied and said no. A few minutes later, he reached out and grabbed my cock. He held it for a while, then started stroking it. It felt really good, so I reached out and grabbed his cock and did the same. We sat there for a while, just fondling each others cock. Since I didn't want him to know I had done this before, I just mimicked his steps, let him lead the way, and think this was all him.