When my best friend and I were about 9, we would stay overnight sometimes during the summer at each other's houses and, at first, we learned it felt good to just fool around playing with each other's dicks. My dick was cut and his wasn't, which we couldn't figure out why we were so different, but made it interesting for both of us (and I still love foreskin to this very day!). I don't know where we got the idea that we could/should suck each other, but once we figured we could we would take turns back and forth. I'm sure we couldn't cum at that age, but we just liked the intimacy of it, two boys in the dark making each other feel good through our dicks - we never kissed or touched in other ways. After that summer it was a long time before I would suck or get sucked again.