Baby Maker

I'm the only son of my father and my late mother, have 2 older sisters. My mother died in 2012 (cancer) I was then 15 and my father waited till I was going to university to remarry. Not that he wasn't dating before then, just decided to marry my stepmother when he had an empty house. My sisters were okay with him remarrying and so was I, but he wanted more children, and he was 50 on his wedding day and his bride 25. Half his age and a timid woman, I've never met a woman so timid as her. Anyway, my father wasn't in greatest health either, over drinking, smoking 4 packs a day and overeating. He used to say he was twice the man others were, when I was growing up. Well, that was true because he weighs more than twice the average man. Whether it was his overweight, drinking or smoking he couldn't get his new wife pregnant. But he blamed her and seeing her upset on one of visits home from university. Seeing my stepmother upset and having heard my father before went to asleep drunk as usual. I tried to comfort her, and I got randy and made a move on her. She of course rejected my advances, till I said my father probably can't get you pregnant because of his health. I can get you pregnant and that will get him of your back. She thought it over and we fucked and fucked again regularly till I had to return to university. My father's only exercise was golf, and he used a golf buggy to get around the course. Anyway, during university and getting close to another visit home, I was informed my stepmother was pregnant. My father was please and to show it got drunk as usual. Lucky, he didn't have to work to get by as we're well off, very well off. On my return my stepmother was happy, and I asked her who she thought had done the deed. I thought it was me and that was her view as well, mainly because my father passes out while having sex and can't complete the job. A baby girl was the result and that annoyed my father a bit as he wanted a son. But I was very willing to assist again, in my last year at university during a break I was fucking my very willing stepmother again and again done the deed. She again got pregnant and after tests showed her to be having a boy my father was very happy and drank himself to death. The heart attack was massive and final and happened the day after I graduated, and I share the estate with my 3 sisters and unborn brother. No mention of my stepmother and I was made guardian of my step siblings. I at first was unsure if I wanted to be lumbered with a family having just finished university, but there was a great bonus my stepmother. But I had a nagging question who their actual father was, I had a test done and it was me. Now I had a closer bond than before because any doubt was gone. Living in the family home and sharing the master bedroom with my stepmother. My older sisters were happy with their families and never visit at all. One reason is their stepmother is younger than they are, and I was her only companion until the birth of our son. With birth and my sisters staying away, I was fucking my stepmother as much as I could, then we thought she was pregnant again and to make less fuss I married her. My older sisters didn't bat an eyelid, just accepted my marriage as if it was a normal thing. My stepmother/wife was only a couple months older than me and at family gatherings we were always together. But the younger of my older sister, did say to me nice move. I enquired what she meant, she then added making sure the money stays in the family. She thought our stepmother might marry again and with her 2 children take all the children's money with her. If she knew I was their father, she would've had a fit. My wife wasn't pregnant, but she soon did get pregnant again. My 2 older children with her have my name on their birth's certificates as I'm named after my late father, and I've never used junior or he senior. There was a slight date problem, but a simply talk with registrar fixed that on both certificates.