About 30 years ago, my mother-in-law was very much alive, and had been a widow for years at the time. She never appeared to have any male friends or go out on dates, but it never occured to me she may be looking for someone to help her relieve her sexual tension. At the time, I was only around 30, and wasn't quite sure if women in their 50's still were as passionate as younger gals. Shows you what I knew.
After a visit at our house with my wife and myself, I would drive her 30 miles to her house, as she didn't drive. After a few times of making the trip, she began to sit a lot closer to me than usual. I obviously noticed, but wasn't sure what to make of it. It didn't take long before her intentions were clear, she wanted me to play with her. At first, being as she was my wife's mom, I hesitated, but soon got over that. As I had to pay attention to the road, she began to unbutton her blouse, revealing small but perfect breasts, which she stroked until the nipples were very erect. I was also very erect at this time, and had to concentrate on the road.
Leaving her blouse on to avoid anyone seeing what was going on, she unzipped her pants, leaving ample room for me to slide my hand into her panties. It was rather clumsy at first, but she angled herself to offer me the best access to her very wet and hot crotch. I was surprised to discover she had no pubic hair, and that she was surprisingly tight. We didn't rush things, but I rather slowly worked her into a very satisfying orgasm. She was a very passionate lady!
This was the first of perhaps 10 or so trips with similar results. She very much enjoyed the times we spent, and kept our sessions secret.
I think of her every once in awhile, and always become very erect as a result. We were able to share something very special.