When I used to have friends stay over we used to both lie on the pull out couch in the basement so we could talk about girls or whatever and when we were finally going to sleep I would go to my room.
One time my friend Adam was staying over. I had just finished grade six and just turned twelve. Adam was a year and half older than me. We were on the pull out couch under the covers wearing our tighty whities and our T-shirts. We were talking about girls in our school and he propped the covers up so they weren't tight to his body and said I don't want you to see my boner. I said let me see it. I honestly meant keep the clothes on, I just wanted to see the outline to see how big it was.
Because I had seen him in his underwear and it was looking a lot bigger than what was under my underwear, also you could tell Adam was already shaving so I figured he was huge. After a couple of times of me asking to see it. He said do you want to Jack me off. After some awkward silence I finally said I don't know how. He replied I will show you and with that he pulled back the blanket and his underwear to reveal a huge cock with lots of pubes. I took took my hand and wrapped it around his cock it was too big I couldn't even put my hand completely around it. He taught me to stroke up and down. After about a minute something happened that I sort of expected but didn't completly understand he started to breathe heavy and he let out a moan and hot white liquid shot everywhere. He then jacked my bald tiny little cock. He ignored my weak protests that I had to piss and I had a dry orgasm.
Soon after I grew some pubes and eventually I could shoot cum. The first time I ever shot was when he jerked me off when we were looking at his dad's porn. We jerked off with other friends as we grew up but none were even close to Adams size. We measured one day my six inch long and five inch round paled in comparison to his eight and a quarter inch long and seven inch round.