When i was younger about 13yo we were camping, me, my family and my cousin was with us. We used to play together when we were kids. He was 14 then. One day he went to somewhere to a forest and I went to look for him, it was dinner time. I found him jacking off. He didn't heard me coming closer and I had possible to watch him and i did it. While I was watching him jacking off, I rubbed myself through my pants. When he was finished, I tried to be invisible behind some bushes/trees.. Lucky, he didn't see me. I was waiting some time before I went back to a cottage too.