I think I was about 9 or 10 in summer camp when I found out about doing 'IT' from two girls that slept the same cabin as I did.
Late one night I saw one girl pull her pillow under her blanket and get on top of it. I could kinda see her in the moon light pushing against it for a long time. A few mintues into this another girl in another bunk nearby did the same. After a while each one stopped and pulled their pillows back out.
I felt I just HAD to ask..LOL..I asked one of them the next day when I was able to be alone with her. She asked me if I knew about doing 'IT' ..I kinda suspected, from just talk around my school, but wasn't sure I told her. She promised to show me that night.
Once it was lights out, we waited for what seemed forever for everyone to fall asleep. Finally she sneaked over to my bunk and whispered how to roll up the pillow and get on top of it and 'hump' it.
I enjoyed it so much I did it almost till morning, that first time. I used my pillow like that for a very long time until I discovered the side of my mattress a few years later. I like having real sex, but sometimes I still like taking my pillow out for a ride.