This happened when I was 12. Five of us did everything together from our earliest years. Three of us were cousins. When I discovered masturbation, I passed the knowledge to all of the others.
I began masturbating when I was about 10 after being shown how to do it by an older boy. It was such a great pleasure, I couldn't resist telling the other four of our group, and when I did they all asked me to take out my pecker out to demonstrate this new found art. So I got out my little hairless penis and jerked away. Before I was halfway to an orgasm, the rest of the group had their immature peters in hand imitating me. I had the first orgasm followed by the rest. After this, we had a circle jerk every saturday in the summer when we went skinny dipping at a secluded lake. Since I introduced the pleasure to the gang, I became the leader of the pack, and usually led our sessions. We were into this for about a year when I began to sprout pubic hair, my penis grew so that it was about five inches hard, and it began to ooze what I later learned was precome, a clear liquid which left a long string when my penis head was touched. All of the group were mightily impressed with my growing pecker, its new beard, and my new capabilities, reinforcing my leadership role since none of the others had grown pubic hair or oozed this new mysterious fluid. During one of my solitary jacking sessions at home, I had my first real ejaculation when my orgasm finally produced two definite ropes of come. On our next circle jerk, I alerted the others of these new fire works before we began, and when I came the others were so impressed that I had to do it again for them.
The following Monday at school one of my friends who was not in the cj congratulated me on my new ability. Someone had blabbed, so I refused to jack off with the gang again. I still went swimming with them, watched while they jacked, but didn't exercise my pecker. Then one weekend they all told me that I should be jacking with them since I started the sessions, had the largest pecker, and was the only one capable of shooting at the time. I resisted. Then the rest of them held me down, took my clothes off, and my cousin stroked my thing until I came. After that, I agreed to rejoin our circle jerk.