Securing my Family's Future

I'm Wendy 54 divorced and 1 daughter Jane 35 and Jane is ultra shy especially around men. We get by okay, but not great and early last year I met David 65 self made retired and no family of his own. We started talking went to fuck regularly and I realized David missed one thing in his life having a family of his own. I would if I could have a child for him, but I'm passed that now. Then while waiting to catch the bus home with Jane I noticed a older man and younger woman kissing. Too passionate to be father and daughter, they had a little boy with them. The boy said mommy can we have ice cream, she said okay and say goodbye to daddy. Then the bus turned up, as I sat on our way home I thought the daddy was in his late fifties and the mother late twenties early thirties. I realized David could have a child with a younger woman and she would be set for life. I always worried about Jane after I'm gone and how she would get on. I thought if David got Jane pregnant and they had a child together or maybe more. She would set, after me and David passed on the child or children would take care of her. David was very well off financially and Jane would be okay. But Jane is so very shy and I know she likes David, but I don't think it enough to be called love. On getting home I decided to talk to Jane and asked her about having children, did she want a child. She said she wouldn't mind a child, but was too afraid of men to get that close. I asked how about David do you like him, she said yes but he's old. I left it at that and gave it more thought, next weekend David took us out for dinners and a movie and we stayed at his place Friday and Saturday nights. I fucked him as usual and Jane slept in another room. I finally decided I should push Jane and get her into bed with David. I first told Jane and she done as usual for her, agreed with my decision. Then I put it to David and he was shocked, but heard me lay out what I had in mind. Still shocked he asked what does Jane think of your idea, I said she willing and you'll marry her as well as breed her. He said he would think on it and I left it at that. During the next week David came to see us, me mainly and said he was inclined to accept if Jane was still agreeable, with one condition attached we quit our jobs and move in with him straight away. I was agreeable and Jane looking at me agreed also and so we moved in with David. David married Jane within a month and before they started trying to make a baby. David got tested to make sure he could and got good news that he still could. The wedding night we had a threesome and Jane lost her virginity and so it was on as they say. Hopes of a early pregnancy weren't for filled, but six month later(March 2021)Jane was pregnant and I was still sleeping and fucking David. Jane wasn't comfortable having sex without me being with them and we were always together anyway. In Late December Jane had a son we called David after his father, Jane is very happy as is David and I'm a grandmother. More are planned and Jane is more comfortable alone with David since the birth of little David. But I like sex and still get fucked by David and will as long as I can.