It just started

I 24 hurt myself at the gym overdoing it, nothing too serious. Just sore shoulders, I live with my aunt Betty 46 widowed in 2022 and needed a place to live. My mother's younger sister had no children of her own, when Daniel died, she was left with a large debt and sold her home, car and just about everything else. With only $300 left no job skills to speak of, she needed a place to live. I lived closest of the family and being a plumber working for a large plumbing firm. I'm the youngest of my 3 siblings and hadn't gone to college like they had, but smart enough to invest in my own home instead of renting. Bought a rundown house cheap and was still doing it up when Betty moved in with me. She helped me with the house done all the cooking, housework and my laundry. So, I don't charge her anything for staying with me. She does spot work, but it isn't regular income for her. Both of us just average in looks, so Betty said she would massage my shoulders to ease the tension. I laid on my bed face down in just my shorts, she massaged my shoulders and back. Had me roll over and done the front of my shoulders, she smelt nice. But nothing sexual in actions, but I got a hard-on for no real reason it just went hard. Poking out of my shorts, her reaction was "Ho a visitor" no real shock. I'd been shocked my cock just going hard, even more shocked when Betty started to stroke it. But I soon relaxed, her soft hands stroking my cock. I started to fondle her, first rubbing her leg and with no response from her I moved my hands to her panties. Rubbing her slit thru her panties, she suddenly stopped and completely undressed. Told to remove my shorts, then back to stroking my cock. I started fingering her and she slowly moaned, then she stopped again and told me to fuck her which I did. I didn't last too long the first time, but longer the second. It was a Saturday afternoon, and we kept fucking and fondling each other till about 6pm, then showered together. Went to a diner for dinner and then back home for more sex. In the months since she sleeps with me every night, regular sex is part of our relationship. We have sex just for mutual satisfaction, we've a lot of mutual satisfaction since we started fucking.