Old Family friend. FF.

A few years back I was injured and laid up for a week in hospital and then weeks more at home. I'd to get therapeutic massages on my legs to promote blood flow while recovered. But my health insurance limited my access to these to once every 3 days not counting Sundays. My doctors said I should have them daily, but my health insurance wouldn't change their mind. It was done daily in hospital and after I was home the insurance company limited my access. With no family living close, I was in a bind, but fortunately an old family friend (FF) 61 came to my assistance. She was widowed 5 years earlier and had done therapeutic massages on her late husband. I was grateful for her help and powder was used instead of oil as otherwise I would need a wash down afterwards. I could walk short distances and was told to do so, but also told to not to overdo it. I'd an old wheelchair I used to get about my house and showered while in the wheelchair. It was awkward but enable me to cope better than I would've otherwise. My FF was stacked and as I improved, my mind started to wander and while she massaged my legs, I could see down her front. At first no problems arose as I wasn't really thinking of sex and there was pain with the massages. But after the first week at home the pain had somewhat eased to a dull ache. The health insurance paid masseur was male and I'd no sexual thoughts when her massaged my legs. After 5 home visits his services were cut out completely by the health insurance. My FF took up his days as well, her dressers were revealing as she bent over massaging me as I could see down her front. But it wasn't until the third week, that my interest was aroused and showed to her by me getting a hard-on. Seeing the tent rise in my shorts, didn't shock her and after she finished the massage. She got my hard cock out of my shorts and got me off by hand. Of course, I got a hard-on every time there after and on the third or fourth occasion I started to stroke her body thru her clothes, and she didn't tell me to stop. A couple of massages later she started to do the massages in her underwear. Taking it as a greenlight to feel her and put my hand inside her panties. No rejection followed and I fingered her as she masturbated me. I was now up and about more than I had been and straight out asked her for sex. She looked at me and thought for a minute or two and finally said Oh why not and we'd sex for the first time. Sex became a regular part of her visit thereafter and even when I didn't need massages anymore, she came over for visits and sex. After several years of regular sex between us, she started to go off sex and finally stopping full sex. But would give me the occasional blowjob for old time's sake. She passed away several years later at 72, I'd been married for the last 5 years and my wife worked, and I did shiftwork and when FF visited, and wife was at work we would play. I've a strong sexual interest in mature women ever starting a sexual relationship with my FF. I satisfy my interest now by fucking my mother-in-law divorced 63 and stacked like my old FF had been. But my relationship with my mother-in-law isn't a secret from my wife. It was started on request of my wife after her parent's divorce, her mother felt very rejected and unwanted. Her mother also lives us, and it have given me my first threesomes.