Breeding my Aunt

I was 19 when I started using my aunt then 30 for sex (2019). She is married to my father's older brother and had failed to get pregnant to him. My uncle is a large A' hole at the best of times. Loud, lazy and really dumb, but thinks he knows everything about everything. If not for inheriting money he would be living in the gutter. My late grandparents knew it and so they put conditions on his inheritance. Every family has someone like my uncle, mostly hidden away if possible. My own father can't stand him, and my mother doesn't talk to him at all. I unfortunately was unlucky one chosen to keep in actual contact with my uncle. A penalty for deciding to become mechanic than go to college, I was bored with school and liked working on cars. But to keep my family paid allowance I've to see my uncle regularly. Fortunately, he is usually passed out from drinking too much, drugs or combination of the two. He smokes like a chimney, so he has major health concerns on top of being really fat. He married a shy woman down of her luck and with a prenup in place she has to provide him with at least one child. He wants a son mainly, but the lawyers said it couldn't go into the prenup that way. So, he has to take what she delivers, I pity her having to let him fuck her. But there is the problem, his mind such as it is, is very willing. But his body says I cannot, with a time limit for her to produce a child. Two years and 13months after marriage no child, I arrived over as was usual for me and met by my aunt my uncle had passed out. He was wanting sex, and his blood pressure must have been too high as he passed out as usual. So, no sex and she is really worried about the prenup. She isn't overly attractive, but I think a lot better than my uncle deserves. She was in a bathrobe, as I talked to her, I got an idea. I myself am average I think in my dating of girls, gotten lucky a few times. Maybe if I fucked my aunt and got her pregnant, it would solve her problems. But a DNA test was included in the prenuptial agreement. But my uncle is very "LAZY", and I thought I could offer to submit the DNA for testing replacing his with mine. But mainly I thought it was a great excuse to get laid, I put the idea to my aunt who was of course shocked. But she was really desperate as well, she didn't refuse or accept. So, I thought I'll give time to think it over and started to leave. Her thinking it was a now or never one time offer, agreed as I reach the door to leave. The first fuck was somewhat awkward, the second one better, then I had to leave. Over the following weeks we fucked almost every time I visited. My uncle was awake several time on my arrival but fell asleep or passed out soon after. Finally, she missed her period, then the next and got tested positive to being pregnant. Then the doctor said she was having a boy; my uncle was over the moon and even more unbearable than before. I knew it was mine as I was the only one really fucking my aunt. I kept getting sex off her even after she was confirmed as pregnant, I asked for sex, and she agreed. My uncle was thinking of getting the DNA testing done during the pregnancy. I used his mistrust of doctors to stop him getting it done, say sticking needles into the baby before it was born must cause problems for the baby later on. That was enough to stop him, with the birth the baby. A sample was taken and my uncle had to provide his sample from home. The sight of a needle was all that was required for him to pass out. I gave the sample for testing, red dot on his thumb made him think it was his blood sent for testing. Instead, I gave the sample at the clinic and nobody thought it strange. The test result would come to me, and I would change my details for my uncles. The lawyers wanted to do the testing, but I told my uncle they just want to charge you a lot of money to do it. So, my uncle refused saying he was handling it himself, didn't mention me at all. Like he knew what he was talking about, the results returned the result as I thought would showing I was indeed the father. Once every detail was changed to match my uncle details. It was only then I noticed blood group was part of the details. Luckily, we had the same group, I hadn't thought about blood group even those it was the method of testing. Must've been around my uncle too much, his stupidity was rubbing off on me. With the birth of our son, I asked my uncle to godfather to "his" son. He agreed as I'd been such big help to him, he even stopped drinking and doing drugs for a time. But it didn't last long, 2020 was a bad year for him. He got really ill, but he recovered. Albeit he was in worst shape than before, but he decided to have another child. He was even less able than he had been before, but my aunt got pregnant fairly quickly. I'd kept up a sexual relationship with my aunt. Having already gotten her pregnant before my uncle decided to start trying again. But we didn't know that the time, we would've a daughter this time. Unfortunately, my uncle didn't live to see her as he overdosed or had really bad drugs. With my aunt now free of my uncle, there was one sting in the tail. He wanted to make sure his wife, was careful his money as he put it and so made legal guardian of his money left to his children not his wife. I thought it was just me and my aunt who knew about the parenting of her children. But my mother had realized quite early, I was up to something with my aunt. She really likes my aunt so kept it quiet until my uncle had passed away. Only mentioning it to us that she knew, not even my father knows. But he manages his brother's estate, as I'm not qualified enough. He didn't oppose my being made guardian, it was in the family, and he looks after my money also. My aunt is quite happy with just two children and had her tubes tied. I'm still her lover and quite happy with that, I do date girls my age group. Still, no one special enough to marry, but I get sex off my aunt which is a great bonus.