When I was about 11 or 12, my best friend and I would spend our time in a storeroom above her garage. It had a window from which we had a clear view of her family's pool. Often we would look out of it and spy on my best friend's sister as she lay suntanning.
One day we were watching from our vantage point as she squirted lotion all over her legs and stomach before massaging it in. Then she lay down again with her feet pointing towards us. She still had the bottle in one hand and was rubbing the top backwards and forwards between her legs, which were now spread apart. I asked my friend what her sister was doing. She said she didn't know, but her eyes were glued to what was going on in below us.
Just then, her sister pulled her bikini bottoms to one side. I was amazed at how hairy she was. My pubic hair still had to make an appearance. She had pressed the suntan lotion bottle against her pussy and was waggling it this way and that. Every so often we could see her butt lift up a few inches into the air. I looked at my friend who was still watching her sister getting off on the suntan lotion bottle. I noticed my friend had her hand stuck down the front of her shorts, but I didn't know what she was doing with her hand. Her sister was still going at it, making tiny, rapid thrusting movements with her hand. All of a sudden, her knees snapped closed and her body trembled a few times.
I never saw her or my friend do it again, but from that day on I was a young lady with a mission! But I'll save that for another time...