My mother became Insatiable

My mother Katherine 41 divorced lives with me, Alfred 22 on our family chicken farm, left to my mother by her late father also called Alfred. My father Robert didn't like the country life and preferred the city and when grandpa Alfred (widower at the time) got sick he stayed behind in the city and ended up finding another woman and divorced Katherine. That was almost 2 years ago now, Alfred got worse and died 10 months ago. Katherine wasn't really hurt by Robert divorcing her as they weren't having a good relationship before Albert got sick and I had heard her say to Albert (before he got sick) that she didn't think Robert wanted to stayed married. It came to a head when Alfred got sick and Katherine decided to look after him and got me to join her as Robert wasn't going to join her on the farm. I looked after the farm and mom nursed her father and a month or so after we had arrived the divorce papers turned up. Katherine didn't contest the divorce and everything was split 50 50, she seemed to be happier after the divorce than before. Over the following months Granddad got worse and Katherine spent most of her time with him. Then after Alfred's funeral it was if a great weight had been lifted off her and she started taking interest in the farm. Then on the night of my 22nd birthday she came into my bedroom totally naked and told me I was the man of the house and I would have all the benefits that went with it. I looked at her and asked what benefits, she just said me. She got into bed with me and we had sex for the first time, again in morning. She told that she hadn't a fuck in nearly 4 years and wanted all I could supply. The next night I slept with her in her bed and have ever since, I only have to look at her and she asks do I want do I want to fuck her. I haven't been all that good get sex for girls I dated and don't have a steady girlfriend at the moment. But Katherine insists I still try and find a steady girl, but will be available for me to fuck on my getting home after any dates. Whether or not I got a fuck from my date, she takes care about not getting pregnant. So I don't have too, we love the sex we have and Katherine told me that we can always have sex in the future. Whether I'm married or not, I can be doing something and she might bend over near me and I get an instant hard-on. There isn't a room or building on the farm I haven't fucked her in and she will let try anything I want too. I haven't tried anal and don't think I will, but Katherine told she will do whatever I want her to do.