When I was about 13 and my cousin Hayley was 11, her brother Glenn about 7 or 8, we would play games whereby Hayley would end up naked and usually I (Occasionally Glenn) would rub her pussy or lick it.
I was the one who started it, and no-one suffered from it. At 15, I started undressing my 8-year-old sister. Eventually, it got to the point where I would lick her ass and pussy and she would suck my dick. The last time was when my brother caught us. He said nothing to mom or dad, but we stopped nonetheless.
I think she’s now forgotten about it, but I still fantasize about her.