I read and enjoy the stories on this site every day.
This event took place when I was about 15. Jeff, Doug and I were new and fast forming friends, all in the 7th grade. Jeff had a tree house in his back yard and invited Doug and I to sleep over in it. This was on a Friday night after school. As evening fell we all met there and went up to do the boy thing and hang out in the tree house. Jeff had an extension cord run from the house to a lamp in the tree house so that it wouldn't be pitch black, at least until we were ready for sleep.
We chatted about different things - school, neighborhood stuff, girls, etc. After a bit Jeff pulled several Penthouse and Playboy magazines out from under his sleeping bag. Oh my God, I had never seen anything like that. I sorta knew about masturbation as I had beat off before and also had the narrow stream of water in the shower bring me to orgasm, but I had never seen pictures like this. We must have all got hard at once because the next thing I knew we were getting our peckers out, all three of us, and we started beating off. We didn't touch each others peckers but we did look and compare, and we had a great time masturbating to the pictures. I don't really remember if Jeff's pecker was different than mine but I do remember Doug's sorta had a little curve to the left. But anyway we all beat off to orgasm. It was great fun and a first for us.
The three of us never did get together again for that, but Doug and I did beat off several times out in the woods for about the next year or so, until girls became our interest and ruined it for us. NOT.
So there ya go. My contribution, thanks for reading, and this is an excellent site. I support it.