“Because I don’t want anyone else to breed you,” He said.

I shuddered at his words before he added, “Your mother wanted me to let her know if you agreed as soon as I knew. So come up here and ride me while I talk to her, she’s not going to be happy.”

I slowly crawled into his lap, “Why’s that Daddy?” I asked as I rubbed his cock head against my wet slit. “Doesn’t want her little girl to be a slut?”

As I pushed his fat head between my folds he grunted before saying, “More that Jethro wants to breed you and if I am keeping you to myself,” He didn’t finish the thought as I started to slowly ride him and he dialled.

I felt flushed and aroused as I heard the phone be answered and my mother say, “By the sounds of it, it went well.”

Dad dropped the phone onto the couch beside us and grabbed my arse guiding me to take more of his cock, “Yes Judith, very well.” He said, “She’s currently riding me, bare, say hi dear.”

“Hi Mommy, God Dad’s cock is so big,” I said shuddering.

My mother laughed, “Bare? So is she fertile right now?” she asked.

“Fuck I hope so. I’m sorry Judith, but I can’t not breed my little eighteen-year-old slut,” as Dady said that I came on his cock. “God, she just had a fucking orgasm at that.”

“Frank, you know Jethro will be hurt that you cuckolded him with his sister?” mum replied.

He groaned again, “I know Judith, and I remember what happened at the last group get together. But I have a really hot piece of arse here, how can I not?”

“You have six children Frank, do you really need one on your own daughter.” I heard mum and gagged in shock, I had half-siblings, four of them apparently. “It puts me in a very difficult position?”

As I went to pull back Dad grabbed my head and pulled me deeper still, “Judith you know how much this turns me on, and you have been fucking our son for years,” he protested. “You love the idea of your son knocking you up, and have even risked it a couple of times.”

Mom’s tone was disapproving, “Yes, the idea, I’m almost forty Frank,” her tone shifted from reproving to something else, “If you want to take your son’s fantasy away from him that’s your call, but you know Jethro does want to give me a child, and if I was a **** when we started fucking he would have. If you let him have Kimmie, maybe you won’t have another crying baby in the house.”

Dad laughed as he pulled me deeper, pushing his cockhead against my cervix, “You’re getting off on this right now, aren’t you? You are fingering your clit thinking about that deal we made last year?” I heard it in her voice after he referenced it, the tightness of her voice, the light panting. “You are fingering your clit right now, thinking about that drunken deal where I promised not to cuckold Jethro on Kimmie and he said if I did he would cuckold me on you?”

“Maybe,” Mum replied.

“Well dear, I wasn’t the one who said yes, you were, so think about that as I cum against our daughter’s cervix,” I heard a louder moan over the phone. “Think about the fact that I am going to cum in her unprotected cunt and give her her own brother and that you promised your son that if your husband ever cuckolded him over your daughter that you would let him cuckold your husband over you.”

The phone cut out at the high-pitched frequency of mom’s scream as I shuddered over Dad’s cock. “Maybe you should take a selfie of you and send it to Jethro to let him know you are open for serious business, cause I can’t give our daughter’s sweet cunt up.”