When I was in my early teens I stayed at my grandparents most weekends. My Aunt lived with them and although she was married, her husband had died some years previously. I had discovered the delights of wanking and I had found my Aunt's knickers several times and smelled them while I wanked.
On Sunday afternoon my Aunt usually went to bed for a sleep and my grandparents read or dozed off in their chairs. One Sunday my Aunt had gone to bed and I went upstairs to use the bathroom. Her bedroom was next door to the bathroom and as I got to the top of the stairs I could hear the bed creaking and heavy breathing coming from her room. Unusually her bedroom door was slightly open and I went to the door and could see into the room through the crack in the door.
The bed was opposite the door and my Aunt was laid on top of the bed wearing just her knickers. Her hand was inside her knickers moving up and down her pussy. Her other hand was squeezing her right tit and I could see that her nipples were large and erect. Her head was back and her eyes tightly closed and she was breathing heavily and moaning slightly. I was mesmerized never having seen anything like it and, until then, thought only men wanked for this is what she was obviously doing.
Very soon her hips began to move up and down and she pulled her knickers to one side, lifted her hips off the bed and pushed two fingers into her pussy. There was a squishy sound and suddenly her hips bucked and I saw that she had squirted a colourless liquid which ran down her hands. She gasped and squirmed.
I was so entranced-I quickly unzipped my pants and was so hard. I stroked my cock and after seconds shot cum all over the floor.
That was the only time I ever saw my Aunt wanking but I often found the 'evidence' in her knickers on Sunday.