This happened when I just turned 13 and began to ejaculate. Paul and I had been friends since we were both 5.
I learned to masturbate from an older boy when I was about 10. Because my family was extremely straitlaced, I kept my self pleasure secret for fear of unwanted consequences not even sharing my peckerly delights with Paul my best friend. As my experience with what was then called jacking off increased, my desire for the pleasure continued to increase until by the time I was 13 and began to ejaculate, I was at it at least twice a day. On some weekends, I got in as many as 10 jackings. I noticed that after the weekend sessions, my pecker remained red and swollen for two or three days, but didn't worry about its appearence.
Paul and I were members of a swimming club so were used to seeing each other nude often. He suggested that on the next weekend, I sleep over at his house, and next day ride our bikes to the little secluded lake we often swam in. I accepted, and made sure that Friday morning, I got in a good pecker workout. That evening I arrived at Paul's after supper, we went to his room, watched TV, and talked until midnight. After I was sure he was asleep, I did my usual nightly JO, and fell asleep. The next morning after breakfast, we set out for the lake. When we got there, we had it to ourselves, so Paul suggested we skinny dip. the water was cooler than usual, and caused our adolescent dicks to retract so they looked plump with bands around the shafts. When we got out, Paul looked down at my pecker, and casually said, that must have been a good come you had last night from the looks of your pecker. I blushed firey red, but didn't contradict him. Then he asked me if I could shoot yet. As we relaxed we related or jacking histories, and discovered that both of us had been into it for about three years. He asked why I never said anything to him about my obsession, and I told him of the fears I had about getting caught by my family. He said not to worry about that, we could get together at his house, and do our things there. That weekend began a mutual JO relationship which lasted 4 years.