Hello! I'm the writer of 'Sleepover Fun' and this is another great story:
As you may know I'm 15 and my brother is 12. He has just started wanking ('masturbating') and we were camping.
It was bedtime which is normally 9:00 unless it's the hoildays. We went to brush our teeth and go to the toilet,
I brushed my teeth slowly and he was done before me, so he entered one of the toliets and started to pee (it was loud). Then I heard it stop and was not coming out.
So, I looked through the crack in the door and I saw him stroking his penis. This gave me a boner in a split second.
I undid my pants making the least sound possible and started jacking off. As I did he started having pre-cum and this made me cum. I helt it in and cleaned it up and left.
I later spyed on some guys in the showers, but that's another story.