I think I was around 11 or 12. I had a good friend in my class at school, Norman. One day Norman came over to my house (as he did sometimes) and brought this other boy with him who I didn't know, named Mitch. Mitch smiled & giggled a lot, I noticed.
The 3 of us were sitting on one of the hillsides near my family's house. I heard this strange, soft percussive sound over by Mitch and turned to see he was taking a piss, seated right there in the open. His pee was aimed high in the air and arc'd impressively. I was so surprised I didn't really even notice his dick, which was obviously out of his fly and held.
"Mitch!" Norman yelled, "I told you not to do that anymore!"
Mitch simply giggled - & finished his public urinating. Later that same day we 3 boys talked about forming a Club of sorts. Norman appointed Mitch as the "Chairman" - & it was decided that anybody who wanted to join this new Club was required to do a private one-on-one "interview" with Mitch. Interviews were to take place in my backyard tent.
Norman interviewed first. He was in the tent with Mitch for 10 minutes or so. I stayed outside. I heard them both laughing and giggling very loudly. But nobody stated what had taken place in there. I figured it out quickly, however.
When I went into the tent with Mitch by myself, after Norman came out, Mitch said nothing to me & I said nothing to him, but Mitch was giggling and giggling. Facing him, I pulled down my pants & my underwear and showed him my penis, which was fairly erect. Mitch looked me over very fully, laughing all the while. He remained completely dressed throughout.
After a couple minutes showing him my dick, I pulled up my pants & that was that. There was no masturbation in this game. To be honest, at that point I hadn't any idea that masturbation existed, or what it was - despite the fact that I had erections. It was an exhilarating & exciting game, giving me a deep feeling I'd never experienced before. All 3 of us were very aware, of course, that we had done something considered forbidden & bad. It was tremendous fun.