Why Not I was Horny

I'm well off financially and have a great career as well, owning my own home. I do okay dating, had no one special at the time. I was 31 and self-absorbed mostly not thinking much about others. But I heard the word sex and that piqued my interest, as I was sitting just around a corner the two women didn't know I was there. One had mentioned she needed a new place to live quickly and would have sex if required to get one. I got up and walked away a bit then turned and then walked around the corner. Mainly to see who were talking, one (53) I knew well, married and wasn't the voice I had heard mention sex. The other was (48) I'd seen her around and hadn't actually met her. She was also pretty good looking for a mature woman. That started my juices flowing as they say, she was passed getting pregnant and I started to think I could gleefully fuck her. So, I went and done up notice Room Available see Nick (I'll call myself Nick). I put it up on the notice board and waited for a response. Nothing at first, the older woman I'll call Cathy asked about the room and I said I'd 3bedroons and after the lockdown of the pandemic had decided not to live alone anymore/ Total B/S, but it was good enough to make it believable. The other woman I'll call Susan, hadn't contacted me and I thought I had missed out. I was going to remove the notice and forget about it all. But Cathy asked could her friend have a look at the room, and I said yes just let me know when. I was hoping it was Susan, but still had no idea if it really was her. Just before I was to go home Susan turned up and asked could she see the Room Saturday morning, I said yes and, on my way, out of the office removed the notice. Two days later Susan arrived and liked my house at first sight and after seeing the room she wanted to take it and ask me what I wanted in payment. I said anything you want to do will do I replied, not an amount nor a request for sex. When pressed I said what makes you happy, but added it would cover your share of groceries, utilities and what else there is. She was financially strained due to death of her husband and his funeral and high medical bills. She had noticed me eyeing her up and so asked if I was willing to trade sex for everything, I was happy to accept, and we confirmed our agreement in my bed. She moved in that weekend and that was three years ago. Susan is still living with me and my new wife, daughter, regularly having threesomes with us. I got married in late 2022 and quickly got her pregnant. My wife is Susan's daughter and only child, she would visit Susan on her breaks from university. We started a relationship and marriage was the result. She knew I was fucking her mother and decided to let it continue. Which is handy as with our daughter sharing our bedroom with us and her grandmother, we still have 2 spare bedrooms. But we are planning to add another bedroom.