Right after high school a buddy of mine went into the Navy and asked me to look after his little sister, 7 years younger than me. I really treated her like a kid sister. There really wasn't any messing around, even after she was crushing on me, years later.
Today we were chatting and she told me something I don't remember. We used to sit in her room and I would bounce change off her ass (I know fully clothed because of what I said before) and we would laugh about it. She said "you used to love my booty." i was shocked and said 'not loved, just curious.' and she told me "Nope you loved it, we would laugh for hours. You said it was perfect."
WTF? I know she's not lying. I told her I was sorry if it was inappropriate but she reassured me it was all in fun and innocent and I never made her feel uncomfortable. Glad that she told me that or I would have thought myself as a pedophile.