Mother In Law Obsession

I used to have an obsession with my ex mother in law. It started one night while I was living at her house and my at the time girlfriend went away for the weekend. Her and her husband invited me into the hot tub for some drinks that evening. We all got drunk and her husband kept taking her bikini top off and I saw she had a great set of tits. For someone who was 50 her tits were huge and perky.
She said to me one day that being naked infront of family was fine and to feel comfortable doing it. So I used to get in the hot tub naked then put my shorts on cause they were still wet and cold from last time. She saw my cock lots and even saw me hard in bed and in the bath. She would always give great advice when shopping for underwear etc. She was also a nurse so if i had a question about something different I would ask her. One time my arsehole was sore so I asked her to look. She spread my cheeks and looked closely and saw a little cut. She touched it and my arsehole and I became hard. She also had a very nice arse and I'm sure she tried to show me her pussy once or twice. I would have loved to fuck her because that is just absolutely perfect.