This happened when I was 12 or 13 and the sight will be etched into my mind forever.
When I was growing up, my family lived in a Boston suburb with big three story houses that were only separated by the driveways up the middle between the houses. These houses were built in the 1920s and were close enough to see into the windows next door.
One year on Thanksgiving day when my mom was preparing dinner in the early afternoon, there was nothing to do and I kept bugging her to let me get the Christmas decorations down from the attic. Finally, she had enough and gave in.
When I went upstairs to the attic, I noticed that from the third floor window, I could see into my neighbors' second floor bathroom. I noticed Mrs. Frank in there preparing for a bath. I kind of hid behind some junk so she could not look up and see me. She was a pretty good looking woman who was about forty.
I could not beleive my good fortune and really do not remember how I felt at the time. I do remember a very nice set of tits and a hairy bush. I watched as she slipped into her bath and then I thought the show was over. I was very content seeing my first naked woman but could not stop watching and waiting for her to get out of the tub.
When she got up and I got another look, I thought she was going to be done; but the show was just getting started. She took from her things that she had brought into the bathroom, what at the time I thought was a tube of toothpaste. She kind of sat up on the edge of the tub and started rubbing her tits and nipples pinching them and squeezing them. Working her way down she started rubbing her pussy and inner thighs all over.
Finally, she got the toothpaste tube and started to rub it all up and down her slit and then worked it inside. She did this for what seemed like forever and finally she looked like she was in pain so she stopped and rested a second then took it out and finished bathing. As she was drying off, she suddenly closed the shade and this was the only time it ever happened.
My mind was spinning and I was wondering how she was able to do this but I was still horny as hell. I don't remember jerking off right there because I was too caught up in it, but I still jerk off to the thought of it.
A couple years later, her son showed me and a few other friends her vibrator hidden in the back of her closet with some oils and other stuff. At the time I saw her in the shower, I didn't know, that what I thought to be toothpaste was a vibrator or that girls masturbated and had orgasms. This was explained to me by her son about two years later and everything from that day made sense to me. He never found out I watched her, but a few years ago at a party at my parents' house, she told me she had caught me watching her in the bath many years ago. This now makes remembering those thoughts extra special.