My Aunt May

My aunt May 35 is married to my uncle Donald 57, my mother Cybil's only brother and he like all our family is very well off. He married late and has a condition in his prenup that May must provide him with at least one child. They have been married almost 4 years and no child yet. Donald has led a life of heavy drinking, smoking and doing drugs as well, But May who was down and out when Donald met her and made the deal for marriage a good life in return for having a baby for him. May thinks his drinking, smoking and drug use may have caused him to lose the ability to make a baby. So when he was passed out she got a sample of his sperm and had it tested. It wasn't a good report she got back, but there was a small chance with medical help they might be able to have a child together. Donald wouldn't take it lightly they he wasn't able to conceive a child and might divorce her instead. She has got use to the good life, she only has to fuck Donald about once a week and he usually falls asleep before starting as he is usually drunk or spaced out. That's where I come in the only male left in Donald family line that may be able to produce a baby. I'm Wyatt 31 youngest of 3 my two sisters are married and live interstate. I still live at home and work on computer software, but have a large trust fund to support me also. I'm not a ladies man and rarely date, except if you counter escorting a cousin to something or another. I became aware of May looking at me quite often and at first thought I had something on my face or my my fly was undone. Neither was the reason, then last February she gave me a note as she and Donald were leaving. It said she wanted to talk to me about a personal matter and I wasn't to tell anyone else. It also had her cellphone and a time to call her the next day, I confused why would May want to talk to me about something personal. But being the good boy I've always been, I done as requested. I rang her and she asked me to meet her and she told me where and when. On our meeting she told me of Donald condition in the prenup about children, still none the wiser. I just looked at her she went on to tell of testing his sperm and how bad the result was, then straight to the point. She wanted me to get her pregnant, I was shocked and asked why me. I was told I'm the closest male heir to Donald and we would have to keep it between us no one else. So I thought I had it and asked you want me to donate sperm so you can get a clinic to help get you pregnant. No you have to fuck me she said, adding only you and me should know. I was shocked again and after a bit of more pushing by May agreed. Donald was reliable in one way he came home regularly and passed out regularly. So the next time he was passed out I was called by May and she fucked me, I laid back she got me up and rode me until I came inside her. In the morning she would be laying beside Donald naked and we had undressed him and she let him think he had fucked her. His memory was hazy at the best of times. The rest of February and all of March she fucked me sometimes twice. I went from a handful of fucks I had paid for to 20 plus in a matter of 6 weeks. I thought I must be like Donald as she hadn't gotten pregnant yet. But a few weeks later at a family dinner, she got me alone and told me I had succeeded. She hadn't Donald yet and so I wasn't to tell anyone she was pregnant. Two weeks later at another family event, Donald told us all May was pregnant. All were happy for them and I thought I had to return to using my hand again. But May had decided the best way to keep our secret was to keep me happy. I wouldn't have told anyone, but her fucking me was a bonus to good to pass up. Donald is very happy and has increased his drinking and maybe using more drugs. So sex with May is more often than before she got pregnant. The best thing she says is I can come and go and nobody would think it strange. I've started teaching her to use a computer and that was at Donald suggestion, so I go and teach her to use a computer and fuck as well. I even get to be on top now and then.