I was about 15, I lived on a farm, and was very good friends with my neighbor Jim. He was the same age. I really enjoyed jacking off whenever I could. One day Jim and I were in my tree house, and it had been a while since I had the chance to relieve myself, anyway, we were up there, and started to wrestle around, and grabbing, and I got the biggest hard on, and I noticed in one of my grabs that Jim was stiff himself. He had grabbed me in my crotch, and made the comment, 'feels good'.
I was a little taken back, but got brave and said the same about his stiff rod in his pants. He asked if I had ever jacked off before, and said as often as possible. He said he did the same. Jim asked if I had ever thought of jacking another guy off? I hadn't really ever thought of it, but after he asked, I thought it would be neat to try.
So it didn't take long, and we had our shorts around our ankles, and had each others cock in our hands. Wow, it was the best thing I had ever felt. We started stroking each other, and it didn't take long before we were both shooting our loads all over ourselves. Needless to say, that was the first of many more years of play time in the tree house. After a few times we got a little braver and tried other things, but that is another story.