I read the story of the little girl and was reminded of this
I am an only child and when I was seven I used to hang out at our neighbors house. My mother let me go over there and play. They had six kids, and one of the boys who was about 12 used to play with me a lot. Back then I used to wear dresses with no panties, I just forgot to put them on. When we played he would stare at my crotch and ask me to show him, which I did because then I did not know better. We would go in the back yard and he would have me pull up my skirt and show my pussy while he would jack off. I would watch him cum and think it was neat. Sometimes he would try to finger me and rub his dick against me.
Then one day when I was ten he had me jerk him off, which I liked to do, and this became our routine, almost daily.
I think this is why I love to watch my husband jack off today, and I still wear skirts with no panties, although on purpose!