Duh, yes

"Last chance to stop," your dad says between kisses.

In response you spread your legs wider and arch your back, thrusting your hips upward so that your cunt takes Toby's cockhead inside you. Toby chuckles. "I guess that's a yes, then," even as he pulls out and lines up to penetrate you properly.

It's not the biggest cock you've had inside you, but it's big enough to get the job done—and it's your daddy's cock. The same cock that fucked your mother to make you, filled her up with seed the same way he's about to fill you. You don't care what shape or size or how hard it is; all that matters now is that your father takes you, makes you his. Completely.

So he does.

He thrusts into you, gently, almost teasing you. Your pussy tightens around him, clenching as each inch slides deeper. Your breathing, already a mixture of panting and gasps, becomes even more ragged. You try to say, "Ohhh, oh yes, daddy!" but it comes out more like, "Ohhh, oh, yeh, da—ohhhhhh!" as the tempo increases.

Your father, however, has no trouble vocalizing as he takes his willing daughter. "Fuck, Nina, I can't believe this is happening. Uh. So. Fucking. Tight."

You angle your hips up even further. His balls start slapping against your ass as you wrap your toned legs around his upper body, willing him to take you as deeply and roughly as possible. He grabs at your breasts, which when your back move to either side. His hands cup them, squeeze them, moulding them back into perfect mounds even as he uses them to steady himself and fuck you harder.

With each thrust his cock hits your G-spot, and waves of pleasure emanate from your lower body. Your toes start to curl and your fingers dig up handfuls of bedsheet. "FUCK, daddy! That's it! Fuck me hard. Harder!"

"Are you sure?" He grunts, adding, "I'm so close now. Any moment now. I gotta pull out before—"

"Don't stop! Don't you dare stop now!"

"Then my little princess better get ready to get knocked up!"

You open your eyes for a moment, and you see him staring at you. Well, it's your father all right—but in a way you've never seen him before. The expression on his face is one of pure lust, unfiltered desire. In this moment, you're not father and daughter—you're male and female, animals in rut.

"Here it comes—fuck, Nina, daddy's going to fucking fill you with his seed."

"Yes! Fill me, daddy. Ah!! Breed me!! Give me your baby! I need it! I need your cum!"

And, boy, does he deliver. The moment you say that, you feel his cock start to throb inside you. Your pussy reacts instinctively, wrapping itself tighter around his shaft. You want to milk every drop of that rich, warm semen from daddy's dick. Toby doesn't stop, either, doesn't even slow down. Your head lolls to one side, and you catch a glimpse of yourselves in the mirror next to the bed: his big, muscular arms flexing as his hands clutch madly at your tanned, sexy little body. His cock shaft moving in and out of your tight little cunt like a piston. He dominates you, towers over you, and is now filling and fulfilling you.

That fulfilment comes as you orgasm again. Your father gently slides out and then lies next to you, still breathing heavily. One hand falls on your thigh, gently pressing it and keeping you spread open so the two of you can watch as his cum drips from your stretched hole.

"Mine now," your father murmurs as he takes your breast and brings the nipple into his mouth. "Mine to fuck, and breed."

"Yes, daddy." You wrap your arms around him, overwhelmed by conflicting emotions—a little shame and shock at what you've done, yes, but also elation, awe, and no small amount of satisfaction. It might have been wrong, but you needed it so badly.

"Do you … do you think I really did just knock you up?" The way he says it, Toby seems to be playing with the idea in his mind. Not just dirty-talk, but actually considering the possibility of impregnating his daughter and what it would mean.

"I don't know. It's possible. I wasn't on the pill, and even if I were, I'm sure they could have fixed that."

Your assumption is more correct than you know. Although the aliens didn't interfere with your inhibitions—your **** is entirely your doing—they shrewdly adjusted your fertility, making it virtually certain you'll get pregnant. And your dad's dick, hardening against you so soon? He can now go all day, if he needs to, just to make sure.

You discover this all, of course, in due time. But for now, the two of you enjoy your first moment of post-coital bliss, father and daughter closer than ever before.