I began having regular sex with my older daughter Sabrina when she was sixteen. We installed a pool in the back yard that summer and Sabina was in it every day. When I came home from work, if my wife was around I would just take a quick dip, but if my wife was gone for the evening, I would hang out in the pool with Sabrina. My younger daughter, Jenny, didn’t care much for swimming so she usually played in her room, giving Sabrina and me time together.

Sabrina was filling out her bikini nicely by then, firm B cups, inviting butt cheeks and long legs. And of course she had a deep tan from all that time poolside.

It started out innocent enough with tickle fights and prancing around the pool until one time, her top came loose. Instead of turning away from me and getting it back in place as she had done in past wardrobe malfunctions, she gave me a delicious smile and just said “Oops.” Soon the top floated away from her, giving me a nice view of her tits. She stood there in the water, topless, her tan lines a deep brown, her milky white breasts just below the water surface, her lovely nipples starting to get erect.

“Daddy, can you help me with that, ” she said. So I retrieved her top, and had her turn around as I helped with the straps. She leaned back slightly, her butt now rubbing my cock. She turned back to me and said, “I liked it better off.” Then with a sly wink and a smile she said, “Let’s go skinny dipping.”

My wife was gone for the evening and young Jenny was at a friend’s house. Against my better judgment, I let Sabrina pull my swimming suit off, and then I reached for hers. My cock got so hard so fast so there was no hiding it from Sabrina. We were somewhat safe from the rest of the family so there was no time for teasing. Sabrina reached down and started stroking me, so I started rubbing her pussy.

There was something about being in the water that made both of us bolder. She rubbed the tip of my cock on her pussy, then guided my cock all they way inside her 16-year-old pussy. Every time I heard a car drive back, though, I got so nervous to I couldn’t enjoy it. But enough happened between us that night to know that one day we were going to fuck, and that day would be soon.

It took a couple days before we had the house to ourselves, so instead of guiding Sabrina to the pool, I led her to her room. We stripped down and kissed for a few minutes while caressing each other, and when her pussy was good and wet, I slid my cock insider her.

“Oh Daddy, it feels so good.” She started moaning louder and louder, but since no one was around, she screamed, “Just like that, Daddy. You fuck me so good.”

After that, we started fucking every time we could get the house (or the pool) to ourselves which wasn’t much more than every week or two when we could hide from both my wife and Jenny. Sabrina had boyfriends and my wife and I were still having a good sex life, but my time with Sabina was special.

As my 40th birthday approached and Sabrina started to get ready to go off to college in the fall, the family rented a cabin for a vacation.

One night, my wife had to return home for a business meeting the next day, so it was just the three of us. But really, I felt alone. Sabrina and Jenny were off to themselves and I heard a lot of giggling from them. Then came my birthday surprise.

The girls told me to lay back in bed, then the two of them appeared in the doorway, both of them totally naked except for pink panties with “For Daddy” written on them. Sabrina by then was 18 and fully blossomed, and Jenny, who was now 15, was just starting to develop.

I was especially shocked because Sabrina and I tried so hard to hide our flings from Jenny. What I didn’t know was that she had been watching us for a few months, and with Sabrina leaving soon for college, she had been grooming Jenny to replace her as Daddy’s mistress.

By now, Jenny was 15 and her body was just starting to develop, her puffy nipples, her bald, tight pussy really turn me on. Jenny approached me with a faux pouty look. “You never played with me like you did with Sabrina, ” she said.

I drew her into my arms, caressed her cheeks and slowly lowered my hand down her chest to her belly, and then to her pussy. It was already so wet and that just made me harder. “You get me now, ” I said. “From now on we can play together with just the two of us.”

“I’ve seen your cock, Daddy, but I finally get to touch it. She stroked it a few times, wiped my precum over the tip of my cock, then went down on me like she already knew how to suck cock. While she was going down on me, Sabrina straddled my face and lowered her pussy to my mouth. It was such an incredible bonding moment enjoying both of my daughters’ pussies.

We spent the next two days naked and fucking while my wife was gone. When it ended, I cherished the two years that Sabrina was my sex toy and I was so grateful that she was my accomplice, making sure I would have a steady dose of young pussy with Jenny while Sabrina was away at school