Uncle Daddy

100% fiction!

My name is Michael. I am 18 and I live in New England with my parents. I have one sibling, a 25 year old lesbian sister, Natalie. She is married to Becky her old high school sweetheart. They hooked up in high school, went to college together and eventual married. As for me, I am in my senior year in high school and recently broke up with girlfriend. The break up was because of “well you are going to this college and I am going to that one far away so, bye”.

Natalie called me one weekend and asked if I could help her out. Becky’s family has a summer cottage near our house and she wanted me to help opening it up for the summer. It would mean taking Friday off from school and most of the weekend. Seeing I wouldn’t be doing anything that weekend I agreed. The weather was supposed to be terrible on Friday but Saturday and Sunday were going to be sunny and warm. I didn’t plan on bringing swimwear as the water would be too cold. I did consider shorts and t-shirts for the weekend.

Friday morning I met a plumber at the cottage and helped get the water hooked up. It was cool and damp inside so I decided to build a fire thinking it would be good for the girls to come into a nice warm camp. Everything looked ready for the summer so I took a shower and waited for the girls.

They showed up shortly after 6 with groceries, wine, beer and several bottles of champagne. After the hellos and unpacking I asked what the champagne was for. Natalie told me it was Becky’s birthday on Sunday. I said I should have been told as I would have brought something. Natalie told me not to worry and that there was something I could do instead. I was about to ask what that was when Becky said she wanted a shower and off she went to the bathroom. Natalie took off with her and left me wondering what it would be like to join them. Now showering with my sister is not something I would think of doing. Don’t get me wrong, Natalie is good looking, short and kind of athletic in build, but she is my sister. Now Becky is tall, blond and long legged, in other words HOT. Showering with her is something I have thought of before.

I busied myself getting supper ready by the fireplace. The girls brought up sandwiches which I got out and opened up a beer. In no time the girls came out dressed in shorts and t’s. When I saw Becky, I held the cold beer next to my growing cock. He shorts were really short and the t was tight and her nipples were trying to poke through the fabric. And to top things off Natalie was dressed the same. I was turning red and trying to keep my cool so I tried to get a conversation going to get my mind thinking about anything but sex.
Me: Let’s eat, I’m hungry.

We sat on the floor eating our sandwiches. Whenever the girls bent over to get something their low cut it’s just gave me more cleavage then I have seen all year. Now I am not one of those guys with a monster cock. But for having average length I am thick. And now I wished my shorts were one size larger as I knew standing up would be embarrassing for me. After we ate I asked what it was I could do for Becky’s birthday.
Natalie: Michael we would like you to sign these papers.

Now I am not lawyer but I did pick up that it was referring to child support, visitation rights, disclosure agreements and it became too much for me to understand.
Natalie: Michael we decided to have a baby. And we thought Becky should be the one to give birth.

Becky: At first we thought about an anonymous donor but I thought it would be better if you were the donor since you and Natalie are brother and sister it would be like blood related.
Natalie: Now don’t worry about any legal issues like child support or anything like that. We had some paper drawn up and you are more or less out of the picture except to be a good uncle.
Me: Wow, congratulations I guess. So like this is weird cause in a way I would be a daddy and uncle at the same time and Natalie you would be a mother and aunt at the same time.
Natalie: Yeah, you would be an Uncle Daddy but no one is to know so you will be just Uncle Mike.

Becky: Didn’t think of that. I like Uncle Daddy, but that just be just between us.
Me: Ok so let me sign the papers.

I signed in places on the small stack no knowing if I were signing away my life.

Me: So what do you want me to do, jerk-off in a test tube at some clinic?
Natalie: We thought about that at first but the more we thought about it the more it sounded too clinical. Besides I want to be part to the birth so why not be there for the conception. So were asking you to impregnate Becky. You know naturally.

At this point Becky move next to me and took my hand.

Becky: Look Michael, you are just like your sister. I love her. You are a wonderful guy. Natalie loves you and I do too. That is far more then what we could say about any other donor.
That being said she gave me a hot passionate kiss. I didn’t resist and put one arm around her. After a minute she pulled away and looked at my crouch.

Becky: What do you think Natalie? Does he look ready to begin?
Natalie: What do you say Michael? Your cock looks ready.

I took a deep breath knowing this was a once in a lifetime dream and I had to nod yes. With that Natalie began to rub my crouch. This is my sister fondling me and asking me to impregnate her lover/partner. In a flash Becky stripped off what little she had on and Natalie followed.

Then Becky grabbed my t and Natalie my shorts pulling them down. Becky started in on kissing again and grabbed my now fully erect cock. Natalie was beside her rubbing Becky’s breast and shaved pussy. I broke of the kiss and sucked one nipple watching Natalie rub the other. The girls were now kissing and Becky started rubbing Natalie’s pussy. For what seemed like forever there were hands and lips moving from breast, pussy and my cock. At one point I knew my sister had hold of my cock and I felt her pussy and it didn’t feel wrong.

I knew I would explore my load at any second and told the girls about it. Becky laid me down on the floor and mounted me cowgirl style. She was wet and tight. Natalie put an index finger and thumb around the base of my cock as Becky rode me. Her hips where rotating all over and I was pumping. Before long my load shot out and Natalie said she could feel it going through my cock. We ended up laying all over each other in a heap. We all agreed it was an awesome experience. I mentioned that it might be a good idea if were repeated this several more time over the weekend just to make sure everything worked out as planned and the girls laughed. Out came the champagne and we celebrated a joyful union.

Over the weekend we relaxed and as my sister said we honeymooned. I lost count of how many times I erupted a load into Becky and got the shock of my life when Sunday afternoon came. I suggested one more time for the road when Natalie handed me a condom and told me that if Becky got her first cock that weekend, she should too.