"I was about 5 or 6 and he was probably about 10 or so when he talked me into (playing naked didn't take much talking, "You wanna get naked?" "Sure!") and we went from there. The next day he brought some of his friends who already did the naked play thing and we spent most of that summer running about naked and playing those fun games.
When I was 8 my very, very, very best friend in the entire world (as only an 8 yo can see it) and I did a lot of naked play and touching/sucking/humping things. He told me about him and his dad doing the same thing and the next time I spent the night at his place dad introduced me to things that sent me to heaven. He became my second very, very, very best friend and so began a wonderful, loving relationship. I still adore that man :-)
From then on, I had relations with several other boys (and a couple of girls now and then), many ages but mostly my age or younger and a few adults.'"
Of course, this case does involve a kind of (possibly dubious) incest, but not between the respondent and the adults mentioned.