At first my wife Jemma was delighted that Kat was so happy and seemingly thriving. Our marriage was lurching from row to row at this point. I was never there, either physically or mentally. If I wasn't fucking Zoe I was with Jemma in body only, wishing I was fucking Zoe.
But the thrilling depravity of sex with Zoe was slowly changing me. Jemma still hadn't forgiven me for what had happened a week earlier.
Kat had been at a friend's house for the night and I had bought Jemma some mildly slutty underwear (standard for Zoe but outrageous for my wife) in an attempt to get her into bed for some much-needed intimacy.
But Zoe had kind of ruined intimacy if I'm honest. After the briefest of foreplay I had thrown Jemma onto the bed, pushing her head down as I entered her roughly and hard from behind and began to pound her arse, my balls slapping against her in our quiet, still house.
"Stop! Wait a moment," said Jemma as my strong hips fucked her into the wall. "Wait Sam. Not like this."
But I didn't want to wait. I wanted her to be Zoe. My Zoe. In the dark she could be. And Zoe liked me being much, much rougher than this. So I kept fucking her. And fucking her. Hard. Then I pulled her hair back with my cock deep in her pussy and told her to beg for my cock.
She did. Eventually.
When I finally came I did it just as Zoe had taught me. I pulled out just before I climaxed and coated her buttocks in my sticky hot cum. Then I turned Jemma round, exhausted by now and forced my cock into her mouth, ordering her to suck it clean.
She hasn't spoken to me since and we sleep in separate rooms now.
Eventually rumours reached me at work. It was unavoidable. Kat was swanning around our office looking like every male's fuck toy fantasy and Joe was never seen without her.
I was in one of the toilet stalls at work one day when I overheard two of the junior account execs talking about Kat.
"What the FUCK is going on with Sam's daughter and Joe?" one said, laughing.
"Did you see them in that meeting?" said the other. "He was practically eye-fucking her in front of us! And when she brought us those drinks and bent over I thought the old boy was going to get his cock out there and then."
"Can't blame him though," said his companion, admiringly. "I was about to myself. What a pair she's got. And can you imagine being balls-deep in that arse? When she was bent over that desk and fluttering those fake eyelashes? Oh God, I would. Barely legal and looking like that. I used to think Zoe had the best tits in the agency but I reckon Kat's serious competition. And Joe's got both of them on a string. He's a lucky fucking bastard if you ask me."
"Do you think he is? Fucking Kat?"
"He's an old dog alright. I wouldn't put him past him. Imagine having that bouncing up and down on you, her hair and tits in your face, begging you to do her up the arse.
"Bloody hell." said the other. "The only thing I cannot understand is what the hell Sam's playing at. He must be blind. Or stupid."
"Or maybe he's pimping her out?" said his friend.
Roaring with laughter, the pair walked out. And I was left alone in the stall, trying to ignore the fact that my cock was rock hard now.
As it later turned out, they didn't know the half of it.... ......