When I was 11 and my sister 10 we used to play games of handstands one against the wall with the other holding the legs to keep them up.
All started by my looking at her knicker crotch to her looking at my underpants through the legs of my shorts.
As time went ny I used to pull her crotch to one side to expose her hairy pussy slit to her pulling my underpants crotch to one side so she could see my tight ballbag and little willy.
This further progressed to my stroking her her pussy slit and her holding my little 2 inch willy between her fingers.
One night in her bedroom I asked if she enjoyed doing it and she said yes as it made her tingle and I said it was the same for me.
Cutting a long story short she ended up taking off her knickers and I took off my shorts and underpants.
We looked at each other, she opened her legs to reveal a little bit of pink flesh and I sat there with my 2 inch cock standing erect.
I stroked her pink pussy flesh and she said she was starting to tingle again. Her legs started twitching and she said she felt good.
I then told her if she played with my willy I would tingle.
She played with it a little and rubbed it a little and I cum. Only a little droplet appeared but I definately cum. We did this more than once.
We talked about it years later and she said that was the first time she had orgasmed and I said it was the first time for me.
She said she quite often masturbated after that once she got the hang of it and I said I did also.
Although it seemed naughty at the time it was a very innocent way of finding out about others bodies as well as our own. Oh for the days of innocence when it was just jump in at the deep end.