I have read a lot of posts here about stuff that people did when they were kids but in my case it started as a kid and still continues with the same person today and now we are in our late twenties.
I was having a sleepover with a friend. We were both 12. I got up during the night to go to the bathroom, then as quietly as I could went back to to back to sleep in my friends bed with her. About to fall asleep my friend asked where I'd been. I just said I needed to pee. My friend said "Oh" and promptly put her hand between my legs. I didn't move for some time, but my friends hand did, massaging my pussy through my knickers. I was getting wet and then I felt her hand go inside and she pushed a finger in me. I was breathing heavy and she kept on until I had an orgasm. She asked me if it was ok and I said it was the best feeling i ever had. She asked me if I wanted to touch her and I didn't even answer and just put my hand between her legs. She wasn't wearing any knickers which was funny because I am sure she was when we went to bed. Her pussy was warm and as I ran my fingers along her slit I could tell she was really wet. I began fingering her and then pushed two fingers inside her and it took less than 2 minutes before her whole body was shaking and she came. That was the first time it happened.
I still keep in contact with her and now we spend time together at a hotel close to the home I share with my husband.
It's our secret that we have kept since that first night in her mothers house.