Take me Daddy

The first time I saw her I was taken in by her beauty. She was 18 years old, 5’6” tall, and 110 pounds with a nice tight ass and a set of c cup breasts that were so firm that they barely jiggled when she walked. Only one problem! She was my fiancé’s daughter!
Her mom and I were engaged to be married when she and I met. It was not long after her mom and I got married that she started calling me “Daddy” and even started using my last name. We became very close. She would curl up on my lap, and sometimes even crawl into bed between my wife and I, while we were watching tv. When my wife was gone she would walk around the house in a pair of tight short shorts and a cut off t-shirt with no bra.
I was not sure at first if she was aware of the affect that she was having on me or not. The way she would grind her tight ass into my lap. The way she would let her hand fall right next to my cock when she would crawl into bed. The way she would walk around the house while wearing almost nothing. Either way, she was driving me crazy.
The first time I was sure that something was going on was soon after we put in a hot tub at our home. Late one cool evening I had come home after my wife was asleep and decided to relax in the hot tub for a while before taking a shower and heading off to bed myself. She came out to join me wearing the smallest bikini that I had ever seen in my life! For the first time I got a truly good look at her body. It was an amazing sight to see! She sat on the edge of the hot tub and slowly lifted her long sexy legs over the rim and into the steamy water one at a time while pausing just long enough between them for me to get a look at her crotch. She was already wet!
As she got used to the temperature of the water she slowly lowered herself into the water while she smiled as she bobbed her breasts right at the water’s surface before submerging their firm glory beneath the bubbles. After a few minutes she came over towards where I was sitting, turned with her back to me and sat on my lap, making sure to grind her tight ass into my growing cock! It only took me a moment to realize that she had removed her bikini bottoms. Then I knew she was trying to get me turned on, and it was working!
With every bit of energy I could muster I tried to keep my cock from growing under her. It was no use! Every time she would move I would get harder. It only took a few minutes for my manhood to reach its full length and girth.