Fucking the old Neighbor

I 32 live in an old-style shop, a small apartment on top of the store. I use the old shop as my office. It's the perfect setup for me, I've an old neighbor 60 on one side and an apartment building 7 apartments on the other. I don't interact with the tenants of the apartments much if at all. My old neighbor like to talk to me, and we got on very well. Of course, she asked if I'd a girlfriend and the usual stuff. Anyway, early last November she came to see me and wanted to talk about a personal matter. She mentioned that dementia ran in her family, and she was getting to age where she might get it. But she had heard of way to defer dementia or limit its occurrence. Sex, regular sex produced endorphins and they reduced or stopped dementia, as I was the old male, she was good terms with and able to perform (her words). She wanted to know if I would have sex with her. To say I was shocked is an understatement, but I was shocked. My first reaction was to say no way, but I said I would think it over. That was enough to satisfy her, and she left, I dismissed it and went back to work. But later on, I thought about it again and suddenly realized my own love life was somewhat less than stella. I had a woman want sex with me and I'd dismissed it. She wasn't bad looking for age and she was willing to let me fuck her. But still a little unsure exactly what she wanted, so I went to see her. She invited me inside and I asked exactly what she actually wanted out the arrangement and the do's and don'ts of such an arrangement. Her response shocked me again as she said whatever I wanted to do to her was fine with her. I was than more agreeable you could say, but not really then and there to start. But I was going away for the weekend, mainly for a change of scenery than anything special. I asked her to come with me and we could work out how to proceed, she agreed. I had a cabin for 4 days and could do whatever I wanted. But with my neighbor along and willing to fuck, I'd another option than I'd before. A bit nervous and awkward about how to proceed decided to first have soak in the hot tub at the cabin together and naked. Then more of a delaying tactic than anything else I shaved her pussy. Finally, I had nothing I could think of to stall it any longer. So, we got into bed together and started foreplay, I finally fucked her, and I quite enjoyed it. She said she had also, that was our second day there and we had started awkwardly and were now fully committed to a sexual relationship by our return. A week break on our return as she was quite sore for the sex, having not had sex in 10 years or so. But it became a regular thing for us to fuck and I mean regular every second day or so and multifil times on each of those days. She really drains my balls, whether or not it will stop her getting dementia I don't know. But it won't be from the lack of trying, I've even fucked her ass, well she did say anything I wanted. But on the whole, it has been great for us both.