Grandma comes for a visit

I'm Ken 24 and due to my mother Katherine and father Paul passing away in 2019 with my father's parents Ken and Rebecca in a multi vehicle accident on slippery roads. I inherited everything as only child and grandson of a only child of his parents. My mother's parents grandpa Russell passed away in 2019 from cancer at the age of 69 and grandma Catherine now 60 also only had one child Katherine. So I'm the only direct relative of hers, she has siblings and they have children also. But I'm of her son Paul and Katherine, I was pretty well off due to the inheritance. But I missed both my parents and grandparents a great deal. Then with the coronavirus lockdowns last year and the threat of older people dying who got it I stayed away from Catherine for about a year talking to her regularly on the phone. I live on the family property 52 acres with a horses and poultry and my old dog Buster. I hadn't gone to university and worked in the building industry before the accident. Since I just kept to myself and potted around the property. No girlfriend or much of a partier before the accident. I was lonely during the lockdowns and would call Catherine just to hear another person voice. I wasn't a virgin and had used hookers mostly. I'm no looker and if you used the Archie comics as a guide I'm like Jughead with thick glasses and a lisp. Archie comics are my favorite comics and always have been. Then when Catherine was fully vaccinated and I had also been done, I was going to go and visit her. But she said she was coming to live with me and get away from the city on to my property which is 55 miles from the city. I told her she should move and live with me permanently. She said she would see how the visit went first and I left it at that. On her arrival we hugged and I showed her her room and we a chat and coffee. Then she had a nap and after I drove her around the property, being well off money wise. I had started to become a bit of a hermit on the property, not going anywhere much at all. Mainly due to the lockdowns, but with Catherine visiting I took her around the whole area. Hoping to get her to stay with me, at the back of the house is a large swimming pool put in years before by Ken. I maintained it myself as shown by Ken before. I had been feeding the horses at the barn/stables and returned to the house and saw Catherine was swimming in the pool. She was wearing a one piece suit and looked great, good figure and a great rack. She could easily pass for someone in her late thirties or early forties at least. I hadn't seen her before in anything except fully dressed and she looked great then also. But seeing her in her swimsuit stirred my juices you could say and I got a hard-on. But not game to try anything I just looked at her. When she left the pool and came towards me to used a deckchair near me. I asked did she want a cold drink or something, with a yes from her I went got her one. On giving it to her, she noticed the bulge in my pants and asked had she given it to me. I just nodded and she just smiled at me. She already knew I wasn't a girl chasing type person. I went inside and hoped my cock would go down soon, I started making lunch to get my mind off Catherine's body. My cock went down after a while and I relaxed a bit, thinking my grandma must think I'm some weirdo who gets horny around women. Then Catherine came inside and said she would have a shower before lunch and as she left. She turned and asked would I like to wash her back, I turned red in the face and couldn't answer her. She came over and took my hand and led me to the bathroom. Telling me on the way, she'll help me relax around women and not get excited and harden up around them. Once in the bathroom she undressed me first and then herself. On getting to shower she washed me allover and then got me to wash her. I had another hard-on and she played with it until I came allover her leg. I was shocked at that, but she just smiled and while me told me we would have to take it up a notch and she lead me to her bed. Having me lay on my back she went to work on me and I was soon hard again and she got on top of me and we fucked and after she laid beside and we rested a while. Laying next to Catherine and thinking of what we had done, I got hard again and I got on top of her and fucked again. After another rest we went and had lunch together. After that day fucking Catherine was top of my thoughts almost all the time. When she left after a further 3 weeks, I wasn't very sorry to see her go. But was console as she was going come back and live with me. She was going back to her place to sell it and pack her things and would return when her place was under contract. I was happy to hear last week that her home is not under contact and she is return the next weekend from now. I asked her when we were talking would still want to share my bed and she said as Long as I want her to, she would. The first night she's back I'm going to take her out for a great meal and back home to fuck.