This is 100% true.

When I was 13 years old, and my little stepbrother was 8 years old, we would often be put in the same bed to sleep. During these nights we would wrestle and play and get erections. I'd have him hold my cock, and I'd play with his tiny dick. I was hard as a rock, and I'd say things in the dark, under the sheets, like hold my finger. Of course, it was my cock and he knew it. He'd do the same to me and I loved holding his perfectly straight circumcised tiny dick. At 13 I didn't know what else to do, but touching his dick was amazing.

One day he brought to me an adult magazine his older brother had, and we looked through it. This was one of the few times in my life I saw a naked woman, so it was pretty damn erotic. We'd spend hours together in a particular attic/crawlspace and stare at the naked pics. Both of us would be hard as hell.

Naturally, we'd push on our cocks down in sexual frustration, and rearrange them. We'd sometimes comment/joke on the other having a hard on, and we'd deny it, but then we started showing our dicks. He would comment about how huge mine was compared to his, but that is because I was going through puberty, and he was only 8 years old. I don't actually have a large cock.

One day while we were in the attic both staring at these magazines, and with our cocks out, I was touching my own. I wasn't masturbating, because I had never done that before. I was just barely touching my rock hard cock. If you recall, when you were young and going through puberty, I was incredibly hard and excited.

While barely touching my dick, I suddenly felt this weird urge to pee. It turns out it was my first orgasm. I wasn't stroking it at all. I was just holding and lightly touching it. Suddenly, out of the tip of my cock came my very first semen. It was pure white and thick and I freaked out not knowing what it was. I wasn't expecting it to happen.

He stared with big eyes and started calling it "puss" and I quickly tucked my cumming dick into my shorts, embarrassed and afraid of what just happened. It wasn't a real orgasm with spurting. It was like an orgasm that you get from edging, but not really squirting.

He never told anyone about this... I hope.