This is only the first time I had an experience with my Uncle.
My uncle Isaac is only a year older than I, and we look similar. Our family is Italian and Irish, so we have darker skin and lighter hair. I found out most of the guys in our family are pretty well endowed as well.
My uncle and I hangout all the time, even now, and he'd always spend the night. I had my parents' old king size bed, so any time I had someone spend the night, it was always in the same bed. On this specific night, it was during the summer, and I remember the central air hadn't been working, and since it was the weekend, the maintenance guy wouldn't be there til Monday. My mom had opened all the windows, so there was at least a breeze throughout the house.
My uncle and I had been out in the sun all day, and gotten pretty dark, and a little on the burnt side, and we'd put lotion on each other's backs, since that was where the burn was. He lay down on his front, and I lay on my side, and we were talking really late into the night. I dozed off for a bit, and woke up, reaching for the sheets, since I felt a chill. My door was open, and the hall lamp shown into my room, and I could see my cousin moving his arm up and down on his dick, which looked huge to me! He was sighing a little bit, and I reached over and nudged him. 'What are you doing?' 'Shit, I thought you were sleeping Steph.' 'No dude.' 'I'm jackin off, man.' 'What?' 'Jackin off. I got horny and had to take care of it.' I didn't know what he was talking about, but I knew that my dick got hard once in awhile. He quickly explained to me what it was and I figured I'd try it too. So there we were, jacking off together. I ended up cumming quickly and it wasn't a whole lot. He kept jacking, and I could see his dick head looked wet. He came, and shot cum out like a fountain! It sprayed all over his abs and chest. He got up quickly, stripping off his boxers, and using them to wipe up the mess. I could see in the light how thick his pubic hair was, and how manly his dick looked, semi hard, hanging out, post orgasm. He got on a new pair of underwear and got back in bed. I left mine on, cause I was a little embarrassed, to be honest.
The next day we hung out as usual, and then a few weeks later, he stayed over again, and we jacked off again. We're in our 20s now, and have been regular jack off buddies, although with girlfriends, we don't need to get off as frequently.