Drained at University

I'm Harry 24 attending university nothing all that special about me, average in looks and build and in the middle of the class performance wise. But my professor Margaret 36, decided due to my looks I would be perfect to get her pregnant. Margaret is Married to George 49 and they have been trying to have a child no luck, Margaret got tested no problem on her side. She also managed somehow to get sample of George's sperm to test and it wasn't great news. Anyway I looked like George around my age and she wanting to be a mother and keep in well with George's family and their wealth decided to use me to get pregnant. To that end I was asked to stay behind after class(2021) and I was told she needed me for a project she was doing and ask was I willing to help her. I said okay and what do I have to do, but first she had questions for me and gave me a form to fill out. It was a standard medical history form, I filled it out and gave it back to her next day, I had to check some details with my mother. I've always been pretty healthy and she said it looked good so far. She got me alone away from the university to started the project, which she informed me was a sexual performance test. I looked at her and asked testing what, she said your ability to perform sexually time and time again in the course of a day. Adding your an average male for your age and you will have sexual intercourse as many times as your able in a given time frame. There are other people doing the same experiments across the country, your in the middle category and there's a lesser category and a elite category. I had to asked who was I having sex with, she responded I'm your sexual partner as I've have to be able to judge your performance each time and it is to be strictly kept secret. You can tell no one at all you understand, Yes I replied still a little shocked and confused, she then asked me to fill out 2 more form, one on my sexual activity history and the other a I had to sign a nondisclosure agreement. She than asked what days I would be available to start the project. The weekend was best for me and she made a time place to start the project. On the Saturday morning I met her at this small cottage in a quiet area of the city, it only had basic furniture in it and one double bed. She said the first day was to get me comfortable with being with her both dressed and naked and once we comfortable with each other the project would start. Also she asked was I still willing to take part in the project, no misgivings. I said I'm okay with it and so she had me sit with her as close as I wanted too. She started to touch me and run her hands over me, I liked what she was doing and then told me I could do likewise to her. I started to feel her up and then she removed her top and bra. I got a hard-on and she had me undress completely and she also finished undressing. She started to play with my hard-on and then we'll give a try and she led me to the bed. I asked about a condom and she said she was on protection and my medical history form didn't show any STD history. We fucked and I left my sperm inside her as requested and after a short rest fucked her again and again 4 times that day and again on the Sunday for a whole month she drained my balls on the weekends. Then she said the project was finished, shortly after she took a leave absence from the university. Returning this year and I heard say she had a child, at first I thought she had a child before we done the project. But then I seen her with her husband a new born, I finally realized I had been used. I waited until I could see her alone and that's when she told the whole story, but she wasn't ashamed of her actions. But she said if I was interested I could help her again to have another baby in the new year. I had really enjoyed the project and hadn't wanted it to end and I said I would if we could practice a few times in between now and then. She quickly realized I just wanted sex with her again and we'll see and if you kept your word there's every chance of just that. I'll see soon enough either way. All names have been changed.