Reading the linked story of the author's first experience with a friend reminded me of my own.
Jason and I knew each other from pre-school times although he was a year younger than I. Our families had been close friends since the high school years of our parents, and were often each others guests. So it was natural for their kids to grow up as if they all belonged to one family.
I had been masturbating for about a year when on a Saturday Jason and I were walking alone in the woods, he suddenly asked, 'How long have you been jerking off?' I asked him what made him think I jerked off. He said, 'Come on, I know you do from how red your dick is.' He and I swam together, so we saw each other nude at school. I was a very fair red head, so after a session, my penis was red for hours afterwards. I finally admitted that I did indeed jerk off, and asked him if he did as well. He said he did. Then he noticed the bulge of my five inch hard tenting my shorts, and asked if he could see it. I hesitated, but gave in to his incessant pleading, sat on a log, and pulled it out for his inspection. He was impressed and sat down beside me, and got his somewhat smaller penis out. Then he began stroking while I stared. Soon he asked, 'Are you just going to watch?' 'No,' I replied, and began jerking with him.
We continued for a few minutes, and then he asked if he could touch mine. I said he could, and he reached over with his right hand, took my dick in his fist, and began jerking. The sensation was electrifying; it felt much more wicked having another boy stroking my penis, soon my whole body stiffened, and I began shooting my usual clear come. I must have had at least five serious squirts before I made him stop jerking my dick, and took several minutes to recover. When I finally calmed down, he said that it was his turn, and I should get him off. I jerked his dick for about five minutes when he began quivering, and I went faster. He stiffened up just like I had done, and began orgasming, but his was dry. After that beginning, we jerked off together at least once a week until I reached the age of 17.