This is a work of fiction with just enough truthfulness to be believable. Anyone engaged in sexual activities is at least 18 years of age.

I (37M) had come down from RAF Lakenheath the evening of Monday 18 September 2006 on a week and a hall's worth of leave to be with my family in Oxford for my eldest daughter's whose birthday was the next day. Since it had been a while, my wife, the mother of my 4 daughters Kate (61F), had gone to bed at 10:00 pm, so that we could have wild, passionate sex like we always did. We went to sleep, exhausted, spooning on our left sides around 11:00. I got woke up by a hand, gently caressing my hairy chest, and the feeling of bare breasts pressed against my back. Kate was in front of me, her head resting on my arm, and her fragrent gray hair in my face. The hand on my chest moved down to my rapidly hardening manhood.

"Katie, what time is it," I asked, knowing it had to be my eldest daughter, the birthday girl. "It's 1:00, Daddy. I'm 18 now, and I want to have a taste of what mommy's been having." "Katie, honey," I said, "I remember what I told you last year after your mother and I told you and your sisters that she is my father's younger sister and my aunt, but if you wait until the weekend, your mother and I will make your first time with me special." "Do you promise, Daddy?" she asked, moving into my field of view. Seeing her bare and rather sizeable breasts for the first time, "Yes I do, and I'll pinky promise you that it will be special," I said holding up my right hand, pinky extended and curved. "Deal, daddy," she said, hooking my pinky with hers. "I love you, Daddy," she said as she leaned over and kissed me on the mouth. "I love you too, Katie." And with that, she was out the door.

As the door clicked shut, "You know that you could have taken her right now," chimed in Kate. "I didn't know that you were awake," I said. "I woke up at about the same time that you did," she said, "but I wholeheartedly approve of what you told our dear Katie." "It's hard to imagine that this weekend I'm going to fill my beautiful eldest daughter's pussy up with my cock and semen." "I know Karl isn't it wonderful." "I guess it is," I said leaning in and kissing Kate where her neck and shoulder meet. I reached up with my left hand to start playing with her right breast, while I ran my right hand down her body and started playing in her pubic hair. "What do you think you're doing, Karl?" she moaned. "You know full well what I'm doing Kate, can't you feel the erection that our dearest daughter Katie gave me," I said, rubbing it in her ass. "Our daughter gave you that," she asked between moans? "Yes, she did. Now I'm going to give it to you," I said as I slid my erection into her pussy still slick from our last love making session several hours before, and slowly started pumping it into and out of her.

While I made love with my wife I whispered into her ear between nibbles, kisses, and kicks on her shoulder, neck, and ear. "Aunt Kate, did you ever think that we'd be here that first time that we made love at Grandma's house?" "Aunt Kate, you haven't called me that in years." "Not since our 'little' Katie was just a clump of rapidly growing and dividing cells attached to your uterine wall." "Always with the clinical talk. Are you sure you're a cop and not a medic?" "I like the clinical talk. While accurate and proper, it somehow sounds dirtier." She laughed and said, "I love you, Nephew. You've given me four gorgeous and intelligent daughters and made me the happiest woman alive these past 18 years." "I love you too Kate." "Karl," she asked, a worried tone in her voice, "how far do you plan on taking our incestuous family?" "Only as far as you and the girls let me." "Well, one daughter seems ready to let you take her, I'm not certain about the other three." "They have a lot of time to make up their minds," I said, the twins will be 16 in November and Karsyn 14 in December. So that's two and four years respectively. A whole lot of time to decide for or against, several times over." "What about granddaughters," she asked? "That's a question that will have to be answered in over 18 years."

As the conversation went on, I continued to slowly pump into and out of my wife while playing with her right breast with my left hand and her clitoris with my right. Kate had five low intensity orgasms before I sprayed her insides with my semen. When I was done, I remained inside her, still kissing and fondling her until I fell out. I don't remember what time we both fell back to sleep, but we remained in the spooning position.

For Katie's birthday celebration, they we caught the train to London. We had a nice dinner out as a family (the six of us, Kate, Katie, Karla, Karen, Karsyn, and I) at a moderately fancy French restaurant. Kate, Katie, and I all had wine with our meals, but Karla, Karen, and Karsyn all had grape juice with theirs. After dinner, we took in a play in London's west end. Afterward, we boarded the back to Oxford. Katie thanked her mother, and I immensely for her birthday dinner and a show, and said that we were already making her Saturday night a "special night.

Saturday rolls around, after breakfast that morning, Kate takes Katie on a spa and shopping day. The other three protested, and I told them all that their mother and I were making the day special for Katie, and that they each would get the exact same treatment on their 18th birthdays, if they chose to do so. While they were gone, I had the other girls help me strip their mother's and my king-sized bed, and I remade it with new silk sheets. Late that afternoon, at around 4:00, Kate and Katie come home with various bags of things and bags of groceries. Kate goes to the kitchen with the groceries and starts dinner, while Katie goes directly to her room with her bags. I give the other three money to go out to eat, and go watch the new "Pirates of the Caribbean" film and go to my room, shave real close, shower, splash on some after shave, and wait for Kate and Katie nude on my bed.

End of Sexy fun with my daughters part 1 part 2 soon.