When I was 15 I attended a camp for the school holidays. I didn't know anyone there but quickly made friends with two boys, Jarrod and Dean. Jarrod was smaller than me but the same age while Dean was bigger than me but 14. We made good friends on the first day and decided to share a tent for the week.
On the third night of the camp we started talking about girls, sex and masturbation. Jarrod was the one who asked how big our dicks were. Dean said 3.5 inches and me and Jarrod both said 5 and a half. Dean didn't believe us. This was when Jarrod suggested we prove it. We all agreed and Jarrod went first. Dean stared at it and then agreed that it was that big. He then turned to me and said 'your turn'. I took out mine and again he stared. At this point me and Jarrod were both rock hard and Dean was tenting in his boxers. Now it was Dean's turn. He was a little reluctant but eventually pulled it out. He had less hair than us and was indeed shorter. So there sat all three of us with our cocks out.
After looking at each others dicks for a while Dean asked if he could touch ours. We both agreed and within a short space of time we were all exploring each others body. It was then Jarrod who suggested we all wanked each other. We sat in a triangle in our tent, I had Jarrod's dick in my right hand, he had Dean's and Dean had mine. Then we began to stroke. Dean was the first to cum but the sight of him coming made Jarrod and I follow suit shortly after. We cleaned up the mess with some tissues from Dean's bag and went to sleep.
For the rest of the camp we took turns jerking each other and ourselves off together every night. Sometimes twice a day. It was a very fun camp. After the camp ended we lost contact and I haven't spoken to them since then.