This will be the first of a series if it's well received. Thanks to dpga4625 for the editing.
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"You can't be serious," I asked astonished.
"Of course, we are, we discussed it thoroughly, and we think it's the best option." my sister Sarah answered, smiling at her wife.
Sarah and her wife Amy were both twenty-one and had been married a year. They wanted a baby. My sister was infertile, so they decided Amy would carry the baby. I got that, what I didn't get was why they wanted me to donate the sperm.
"It's too strange. I would be their uncle and biological dad that's nuts." I asked exasperated.
"Don't worry Adam, we won't tell them until they are old enough. You don't have to do anything, just be their uncle," explained Amy.
"Except impregnate my sister-in-law," I pointed out, they both laughed.
"You just need to give a sample you guys won't need to, do, stuff" Sarah laughed.
"I don't know Sarah, would be cheaper" Amy giggled, looking me up and down.
"Haha," I said sarcastically.
My sister-in-law had always teased me since were kids. We grew up together, they were a couple of years older. Amy was my first crush, something she was well aware of and tormented me with. She was my sister's best friend who had been in love with her since she hit puberty. It took Amy a string of shitty relationships and one girly weekend in Paris to realize she loved my sister too.
"I just don't see why it has to be me," I said reasonably.
"You know I have always wanted to carry a child, finding out I couldn't was devastating. With Amy's egg, they will have half her genes and we don't want the other half to be some, random guy." Sarah spoke with such passion and vulnerability.
I knew how much it had hurt her to find out she was sterile I was with her in the hospital.
"What about the neighbors, friends' family, what will they say if they found out," I said concernedly.
"All they will know is we're using a sperm donor, when it comes time to tell our baby we will judge the situation," Sarah said convincingly.
"I'll think about it," I said. They both came over and hugged me. My sister and I were pretty tactile, we always hugged and kissed on the cheek. Hugging Amy was different, I felt her warm body and pert tots pressing into me and my cock stirred. Thankfully I don't think she noticed.
In fairness, I could understand the reasons why they wanted my sperm. My sister did look a lot like me. We both had chocolate brown hair, our mum's dark brown eyes and dad's nose. There were differences to of course. I was tall, where she was short. I had a few pounds to lose. She had the tight toned body of an athlete.
Amy was a tall leggy blonde, she looked like a Swedish volleyball player. She had a pert, full bum, blue eyes and luscious breasts, a good handful each. It's a bit sick but I often thought of them fucking. Imagining Sarah camped between her wife's long supple legs, sucking on her swollen clit was a regular, in the fantasy wank bank. I had come to terms with my perverted fantasies, after all, they were only in my head.
I didn't know what our parents would think about all this, but they had died in a car crash five years ago. It was the same crash that caused Sarah's injuries resulting in her infertility. We got through it together. I was only fourteen, Sarah was sixteen. It brought us together. Our grandmother moved into our family home and looked after us until we were old enough to look after ourselves. Now it was just Sarah, Amy and me.
I had no one from whom to ask advice. I didn't want to ask friends in case they judged my sister. I mulled everything over. I loved my sister; they would be amazing mothers. I also like the idea of being an uncle, this would be an amazing gift for them. I don't know how I would feel watching my child grow up, pretending I was their uncle. Would it affect the dynamics between my sister and I? In the end, I decided to help as my sister, was a very special person to me. Since the accident, we had grown so close and I realized I would do anything for her.
They both cried when I told them. The trip to the consultant was nerve-racking. He explained everything and asked me loads of questions. My sister had taken Amy's name when they married, so we didn't have any problem with awkward questions. The consultant was concerned about my age. At only nineteen, the he grilled me to confirm I understood exactly what I was agreeing to.
Once we had signed some forms, he explained that they needed a sample today to test my fertility. I looked sheepishly at my sister and sister-in-law. They tried not to laugh as I was led down a corridor, by a very attractive young nurse to a little room.
"Here you go, just fill this to the top, you'll find some stimulating material in the corner." the nurse said passing a small pot to me. If was more confident I might have made a joke but I was nervous. I stood there hovering on the threshold.
"Come on, it's nothing you haven't done, thousands of times before." the hot young nurse whispered in my ear.
I walked into the room and heard the door click behind me, it was a grim place, clinical like a dentist, smell of disinfectant and cleaning fluid didn't help turn me on. There was a plastic chair, with a little table stacked with a variety of porn mags which I sifted through finding a page that piqued my interest. Two attractive young girls, one blonde and one brunette were kissing in a loving embrace.
It was easy to use this image as inspiration to draw on something from my wank bank. Girls in the image morphed into Sarah and Amy instead. The thought that they were both just a few meters away, and knew what I would be doing in here, made my cock grow.
I imagined them coming down the corridor and seeing if I needed any help. The scene played like a porno in my head. Sarah came in asked if I was having some trouble. She would then bring in Amy. They would seductively undress each other. I started stroking my cock at the fantasy.
Amy would give my sister a fiery kiss pushing her naked body against the wall. I imagined Sarah's back arching as the cold surface touched her bare skin. Amy would slip a nipple into her mouth and her hand glided down Sarah's flat toned stomach. Her tongue flicked out across Sarah's nipple, she pulled into her mouth and her puckered as she sucked on it. Amy's hand stroked Sarah's thighs slowly tracing circles, moving steadily up to her hot shaved pussy.
I felt the usual sensations building at the base of my cock. I just had enough time to pick up the beaker and deposit a sample, a big sample. There was a knock on the door,
"Hi, how's it going in there?" came the voice of the hot nurse.
I sorted myself out and opened the door. I gave my sample over and went back to the waiting room. Amy and Sarah looked over as I entered making it a bit awkward waiting; I couldn't make eye contact with them. A short while later the consultant called us into the office. I had good swimmers, the girls hugged and kissed my cheek which was embarrassing.
