My Aunt Mary

Aunt Mary 34 is married to my uncle Donald 58 a hard smoking, heavy drinking and drug using fool of a man. Luckily for him the family is very well and the lazy idiot doesn't need to work and 4 years ago he married Mary only to get himself an heir. With a prenup in place, Mary had to produce a child for Donald. Who is either drunk or spaced out most of the time, Mary married because she saw it as a way to improve her life. After years of getting no where and Donald starting to talk of divorce as she hadn't for filled her ag5reement with him. Mary got a sample of Donald's sperm and had it tested, the results were very bad. Donald over drinking and drug use along smoking heavily meant he couldn't make a baby without medical help. Donald isn't likely to agree to that and so Mary needed a backup plan, that's where I come in. I'm Wyatt 35 only son of Jessica older sister of Donald and only close male relative on Donald's side of the family. I'm a nerd for the best description, done great at university and have a great career in computer planning. I first noticed Mary watching me closely at family events, at first I had something on my face or my fly was open and after one of these events she gave a note. The note said she needed to talk to me about something personal and I wasn't to tell anyone else and the note had her cell phone number on it and a time next dat to call her. I done as requested and she arranged to meet somewhere quiet and out of view. On meeting her she told me of her problem getting pregnant and the prenup and about Donald very sad sperm count. I was sure what it had to do with me, but she asked me to get her pregnant. I thought she wanted me to donate sperm, but she wanted to keep it just between us. Meaning me fucking her, or her fucking me as it turned out. I'm no great lover and those I'm not virgin, I don't have much of a love life except by paying for it or using my hand. I was awkward in agreeing, but she told to come over the next afternoon about 3 as Donald was usually out drinking or already passed out from drinking all the night before. I arrived (Saturday) as arranged and Donald was passed out and Mary took me to another room. Had me lay naked on my back and she sucked my cock getting hard and then mounting me and riding me until I left my sperm inside her. After a rest she got me up again and rode me again till I again left my sperm inside her. The Monday following I decided to get tested myself and it came back I was very healthy sperm wise. The next Saturday Donald was out playing golf, but it meant he was at the golf club bar. After another session of sex with Mary I was quite enjoying the sex with her, it had all started in February and by early April. Mary had gotten pregnant and I thought sex would stop, but Mary had decided to keep me close and continued fucking me and had got Donald to get me to teach how to use a computer. Donald got use to seeing me teaching Mary to use a computer and would either go out or use drugs or drink until he passed out. I asked Mary would she like to have a spare, at first she didn't know I meant. I told her that royal families had a son and another son who was the spare. Might as well she said, so I would get to keep fucking Mary until at least one more child was born. Donald would be passed out and Mary would get him naked and he would wake with her naked beside him and think he had sex with her. Donald delighted when told my Mary she was pregnant, I'm not sorry for Donald not being able to make baby as he had treated me badly growing always making joke at my expense, being too nerdy and skinny like a weed. I like fucking Mary and we are quite close as a result.