This happened when I was 13. My friends and I are in scouts and we always hang out together. Well one week during summer camp it was a hot night out and I was really hard in my tent, my friend Adam came in while I was masturbating and he saw me and he asked me what I was doing and said jacking off. He said what's that, I said I will show you later tonight when the leaders are asleep, he said ok.
So later that night when the leaders were asleep it was me Adam and Greg. So I told them to take off their clothes, they had good size penises. Adam about 5.5 inches and greg 6.4 inches, and I was 7. There dicks were erect then so then I started masturbating myself and they both asked if they could practice on me first. They have never done this before so they both had a chance on me and then I started rubbing both of them at once to show them the hand movements, and they just started moaning and then after a couple of minutes they both cum. Then we all tried some of each others cum, it didn't taste that good since then we are always tent buddies and have done this at more campouts and we still do sometimes.