My friend Jay and I were walking to the store to buy something and on the way home we found a porno magazine along the curb that someone threw away. It had been there for a while because it was wet and the pages stuck together. We looked at it a little but we didn't want to rip it (or get in trouble for looking at it), so I stuck it in my pants and when we got near our neighborhood, we hid it in place we used to hang out with our friends. It was a field with some trees there and we stuck it behind a rock so it would dry.
The next day we went back and sat down by a tree and started looking at the magazine. No one could see where we were (which is why we always went there). The magazine wasn't a name brand like Playboy and was from the 70's with black and white pictures. I was 13 and had been masturbating for a few months. Jay started to get hard from looking at the pictures. I said to Jay 'I've got a boner now.' He said 'what's that?' 'It's when you see a girl and your dick gets stiff', I said. 'Don't you know?'. He said no. I asked him if he wanted to see and he said yes. I pulled down my shorts and sat down again. I said 'now I got my pants down, I could masturbate'. He didn't know about that either. 'It's when you look at a girl and you rub your dick until this white stuff comes out. It feels real good.' I didn't even know what 'cum' was yet myself. I said that 'I'll show you, but you can't tell anyone. Promise?'.
Jay promised and I started to rub myself. I had Jay hold the magazine and turn the pages for me. After a few minutes I said 'It's gonna come out..' and I shot a load on to my leg. Jay asked me if I was alright. As I wiped up the cum, I told him I was OK and threatened that I would kill him if he ever told anyone. Jay hid the magazine and we left.
We never mentioned it again and I never saw the magazine again either. I think Jay took it for himself.