My mother in law had moved in with us when she told that she had dementia. She was getting into the late stages when this happened. I love to jack off and with her in the house and her not sleeping well it meant we didn't sleep well either. So my wife was not in the mood very much even though it never stopped me from being in the mood.

One afternoon while my wife was at work my mother in law dozed off watching TV. I got up and walked in front of her and she was out cold. So I undid my pants and pulled out my cock and started stroking it until I got good and hard. She didn't wake up but I was worried she might, so I headed to the bathroom and closed the door. When I got in there I took my clothes off and started stroking while watching myself in the mirror.

I was having a great time and then I heard my mother in law walking down the hallway. She had the habit of dragging her hand along the wall when she did. I had gotten to point of no return and stepped in front of the toilet so she would think I was using it when she walked in.

Just a few seconds later she opened the door and walked in. So there I was naked, all 7 inches sticking straight up and my left hand on my cock. She stopped, said "Oh I'm sorry." The entire time she never looked anywhere but only at my cock. I wish I could say that she then came in and gave me blow job but that never happened. I continued to stroke until I finally came and then cleaned up.

She never said anything to me or my wife about it either. With the dementia, I doubt she ever remembered.