Is it normal for sisters girl friends to let me kiss legs

I do not remember how old I was, it was about year or 2 befor I started school. But I had three older sisters and I just remember getting in troble for looking up some dresses. Then one day when most all older kids was in school one of my sisters friends lettle sister said she'd let me look up her dress for a kiss. So i said ok so she took me out to the barn pulled up her dress and pulled her panties off sat on a stool and m.ade me french kiss her crotch which I liked. Is it normal