When I was younger, say 6 or 7, I used to live in a very small country town. In this town there were two other families that lived nearby, but only 1 of them we really got on with. We used to always play games with this other family, often until after dark. Anyway one day we were all playing in an old shed, both me and my sister and there family of 3 boys and 2 girls, when somehow it was decided that we would get down to our underwear and lie on top of each other. So that's what we did, the oldest boy on the bottom then my older sister, then the middle boy, followed by their older sister and me with their younger sister on top..even at the age of six I became exited by this! To this day it's never been repeated or even mentioned but I still have fond memories. I also recall an experience around this time where my older sister took me under my bed, pulled both our pants down and pushed our shirts up and then lay on top of me, pressing her young naked body against me and breathing heavily into my ear as if she'd just gone for a run, she just lay there for a few minutes while my body tingled.