My friend Jack invited me to spend the weekend with him at his parents' summer house when we were both 15. As I later found out, he had planned ahead.
Jack and I were both swimmers who got to see each other naked every school day since we were 13. Over the next two years, we both matured, and by the time of his invitation, had grown pubic hair. I had been masturbating for five years, and as I later learned, so had he. Anyway, I was invited to spend the weekend; when we got to their summer house, it was about six o'clock. He suggested that we take a walk until supper time which we did. When we got out of hearing distance, Jack began talking about girls we both knew and what we'd like to do with them. I got a hard, looked at his crotch, and so did he. Out of the blue, he asked me how often did I jack off. I was surprised at the question, but answered truthfully that I did it two to three times a day. This conversation broke the ice. That night when we were in his room and everyone else was sleeping, Jack locked the door, stripped, and I saw his hard pecker jutting out about six inches. He looked at me and said, 'Don't waste time. Come on, get yours out.' I did, and we began our first mutual jack off. The first one lasted about five minutes, and we both shot huge loads. We jacked off twice more that night lying in bed, and that night's last session was the first time I got a hand job from anyone. We jacked off six more times while we were at the summer house. I asked Jack why he invited me. He replied that he had been watching my pecker grow for two years and wanted to see if it got as big as he thought it would when I jacked off. I asked if I met his expectations. He said that I did, but he'd have to train me a lot before I got as good as he was.