So, I was chosen

I was 19 and youngest of 5 and my father's first cousin widow, she had a child a daughter then 35 and his cousin feared her daughter wouldn't have any children. So, she added a condition to her will no child no heritance. The child had to be born of the daughter not adopted, the daughter at first thought she could change her mother's mind. But she couldn't, that's where I come in unbeknownst to me at the time. During a family gathering everybody was present and as usual for me I tried to stay in the background. I've a lisp and had mocked about all my life, even by some family members. But not when others were present, but I still preferred to stay in the background. I was thought a little awkward by some family members due to reluctant to engage with people. My father cousin is my second cousin and her daughter a third cousin I think, not I was thinking about it at the time. At the 3day weekend long gathering I came onto my third cousins radar you could say. The first I knew of a change was her wanting to talk with after lunch on the first day. Usually, I was left alone, we talk about each other hopes and dreams and future plans and then she asked did I have someone special. With my No answer, she moved on to another subject. Next day she came to me straight away and was with me most, if not all the time. She asked for and was given my cellphone number and nothing out of ordinary happened. A week later when I was back at university in the same city as my third cousin worked, she rang me and invited me to lunch on the Saturday. I thought it was just family being friendly. But it became regular and after a month or, so we were on very friendly terms for my interaction with others. I felt comfortable when I was with her, then she asked me would I do her a very great favor and I'd to promise to keep it secret from everyone family included. I agreed to keep it secret and said I would if I was able too. Still not knowing what she wanted me to help her with. She then asked me to get her pregnant and told me reason why and why she had chosen me. Stunned and shocked at first, but I recovered and said I would think it over. Her reasons for choosing me was simple, first I wasn't attached to anyone at the time and using me gave her child a stronger attachment to our boarder family. In her mind was better than just a one-night stand with a stranger. I was still a virgin and decided to give it a go, at least I would get sex. On my acceptance she had me move in with her without telling the family and she started to train me to suit her requirements. I managed to get her pregnant fairly quickly, to quickly for me as I thought sex would stop. She still allowed me to fuck her as she thought I'd earned the right as they say. Several weeks after the whole was informed of her pregnancy, I was formally asked to live with her. She said it so she wouldn't be home alone while pregnant. No other family members thought I could be the father; I would be the last one they thought in or outside of the family. But her mother came to visit and seeing how close we were together put two and two together. But won't tell anyone as she says they don't need to know. She was also very happy to be becoming a grandmother and test showed it to be a boy. Now 3 years later I'm still living with my third cousin and our son. No more children required but sex is still part of our living together. Her mother is hopeful of at least an accident pregnancy or her daughter changing her mind. As I'm willing to make another baby. My mother also worked it out about a year after the birth but will keep the secret she says.