It just started

I (25) bought the family home off my parents when my father got a promotion (early 2023), and they moved to live closer to my sister and her family. With a bank loan to pay off I wasn't dating or partying at all, home alone mostly sometimes I got a visitor. My neighbor 57 widow and very old family friend, started to visit me regularly to talk and I think to check up on me. She was referred to as aunty by me and my sister growing up and had lost her husband to a work accident in 2021. One Saturday afternoon she came over to visit me as she usually did on the weekends. While were talking a weather alert came over the TV and a storm cell had formed and was heading towards us. I went with her to check her yard for anything that could be picked up by the wind and then back to check my yard. She came with me as she didn't want to be alone during the storm. Once sure everything was secure, we sat watching the weather changing thru the window. As it started get worst, she cuddled into me, and I got aroused. But she didn't notice straight away, only as the storm was almost passed overhead did, she relax enough to notice. She was amused an old gal like her could arouse a young man like me. But she also started to touch my hard-on and finally wanted to see it. I got out my hard cock and she started to play with it again and finally said she would get me off. So, with her encouraging me to let her get me off we went to my bed. At first, she just stroked my cock then she started to suck me off. I was a little shocked she would go that far but let her continue. She stopped stood up and completely undressed and then she said we might as well go all the way. So, we fucked twice than we had dinner together and she stayed the night with me. We fucked twice again before going to sleep and again on waking in the morning. She left after we showered together to go to church as she did every Sunday rain or shine. On getting home she came over to my place and we cuddled some more no actual sex as she said she was sore from our previous fucks being out of practice she said. But promised she would let me fuck her again if I wished once she had recovered if I still wanted too. I wanted too, as she was my only sex partner at the time, and I really enjoyed fucking her. Sex became a regular thing between us, a friend's benefit she calls it. Then in June this year her daughter 23 returned home and with aunty pushing both of us we started to date. We became lovers and almost a year to the day another storm cell came thru, the 3 of us were together for its passing and we all ended up in a threesome. I make just one mistake and failed to take enough care in fucking my girlfriend. She got pregnant and we're marrying this coming weekend Saturday 21st. Her mother is selling her home, and they have moved in with me as my home is the larger of the two. They moved in with after storm, but waited till now to sell the house so we would have plenty of room for the families returning for the wedding. My wife to be doesn't mind her mother getting fucked by me and like her mother sleeping in our bed every night as well.