We had all been on a school trip to Switzerland and as a group of 14-year-olds we were beginning to explore our bodies and of course our cocks. I had been wanking off for several years but several of the other boys hadn't done it yet.
On the train ride home when we were all supposed to be asleep one of the boys got up and in the darkness wanked off thinking naively that nobody was watching. The round of cheers as he started to shoot told him otherwise.
One of the boys and I got talking about wanking and he told me that he hadn't done it yet, and asked me what it was like and how to do it. We were both sitting on the top bunk and as I told him what to do he took his cock out and started to wank. After a time he said that he was bored with doing it and stopped. I asked if he wanted me to continue for him and he said ok. I didn't need any further asking and took his cock in my hand and started wanking him off. After a short time he said he was getting close and then his prick exploded with a nice stream of spunk.
This was the first time that I ever wanked off another guy.