Ball Draining Nana

My widowed Nana 65 came to visit me and straight to the story. She caught me masturbating and she took over the stroking and then sucked me off. That was the start of our sexual relationship, I was fucking her regularly until she returned home. But she missed our sexual relationship and so did I. That she asked me would I mind her returning and staying with me, until she got her own place. I told her she was most welcome to stay as long as she wanted too. So, she put her home up for sale and came to live with me. I told she didn't need her own place as I liked her staying with me, she replied she wanted me to find a wife and give her great grandchildren and her living with me would slow if not stop that from happening. I'm not the greatest when it comes to dating, but I do fairly well. I had been dating a girl, but it had been a bit on and off again. I liked her a great deal and had sex with her, but she couldn't seem to commit herself fully. I saw her another girl and they were getting pretty serious, I realized she was bi-sexual and wanted more just a man. I decided to have her over for dinner and have her meet my Nan. Just maybe they would hit it off and I might get a better relationship with her. The dinner was great, she and my Nan got on really well. It was several days later, I dropped home just after lunch as I had nothing else left to do. I caught my Nan and girlfriend getting it on and so I joined them. In a few months I was married, she was pregnant by mutual design. Nan still lives and sleeps with us both and Nan regularly drains my balls. My wife has set her sights on my (divorced) mother also and her and Nan are working on seducing her.