This is all happened when I was fourteen. I think of this a lot. My friend came over for a sleepover, he was twelve at the time, and we were watching tv. I flicked past a channel showing porn with a great porn actor who I loved!
I brought the courage up within myself, to ask him if I could wank, he wasn't sure. I said you can go out of the room if you want. He said ok. So I started masturbating and he burst in ten seconds later and I just managed to pull up my trousers in time. He asked if I was done so I said no. I then persuaded him to masturbate with me, as I was high on adrenilin. He agreed, but only if we put the pillow in between us. I asked if I could have a look at his penis and he said ok, and it was very, very, very small compared to mine, which was about six and a half inches at that time, now seven!
That was it, but I still masturbate to it today!