You use the Keltraxan girl...

You figure the Keltraxan girl shouldn't be putting her tongue to waste... not when she could put it to use for the sake of science. You smile deviously as you step back away from your father, watching him ravish the Keltraxan as her eyes follow you.

Stepping in front over her, you grip her hair as you lay back on some cushions in front of her. Her mouth wide as she moans and struggles to keep her composure from your daddy's cock plundering her tight pussy.

But her mouth gets even wider as you raise your knees up towards your chest and part your thighs. Her eyes locked onto your dripping and swollen pussy.

"What are you doing Nina?" Toby groans with a knowing smile.

"I think she should learn a bit more about me dontcha think daddy?" You say with a devious smile, scooting closer to her face, feeling her warm breath across your needy pussy.

"Mmmm yessss" He hisses, his cock flexing inside the Keltraxan woman. Making her squeal loudly as she is driven into your pussy.

Pulling her by the hair, you grind your wet pussy against her lips, letting out a soft moan as the tip of her tongue runs up between your lips to your clit. The Keltraxan scientists amazed by such a discovery.

You grind your hips as the Keltraxan runs the tip of her tongue curiously around your clit before slipping it inside of you. Your eyes full of hunger and lust as you feel it slip deeper and deeper inside you. Making you moan in surprise at how long her tongue is.

You suddenly hear a loud POP as your dad sides his cock out of the sexy Keltraxan. At first you are confused but you quickly smile as you see him push her onto her back, guiding her legs around his waist as slips back inside of her.

Biting your lip, you stare into Toby's eyes as you straddle the Alien's face. "Mmmm much better daddy..." You tease, grinding your hips as you lean forward to press your lips against his. Moaning into them as the Keltraxan's tongue slips back inside your pussy, slipping even deeper inside it.

Your tongue slips into your daddy's mouth just as the Keltraxan's tongue twists deep within you, the bumps and ridges on her tongue pleasantly stimulating every inch inside your greedy pussy. Your body shaking as parts of her tongue vibrate within you, seeking and testing every little spot. Her lower lip grinding against your clit as you ride her face.

Breaking the kiss, you lean into Toby's ear and whimper, "Daddddyyy... she's.... ohhh fuckkk she's gonna... she's gonna make me cummmm...."

"Fuck me too sweetie..." Toby grunts, cupping your breasts and teasing your nipples as he slams his cock into the shuddering Keltraxan beneath you. Her tongue driving you crazy as it mercilessly seeks out every pleasurable spot inside you as the tip reaches your cervix.

The Alien purrs as the tips of her tongue presses against your cervix and she senses the life within you. She pauses before grinding her hips and her pussy greedily milks your father's cock... **** for the same opportunity.

"Daddy... I... I love you!" You moan as you kiss Toby's neck, shuddering as you are driven over the edge.

"Ughhhh shit me too... Oh fuck I'm gonna cum!" Toby cries out, driving deep into the Alien's pussy.

"Yes daddy!! Cum inside her... ruin her! Fill her with that hot fucking cum!" You cry out as you cum around the Alien's tongue.

You hear the Keltraxan cry out with a mix of surprise and excitement as she feels the warmth of Toby's thick cum squirting into her, filling her deeply. Her pussy pulsing around his cock as her lips tighten around the base of his cock, sealing every drop deep within her. Sensing it's potency before she loses consciousness, her body shakes violently as she cums... milking every drop of his seed. Your daddy's sperm rushing into the Keltraxan's girls womb, dozens of her released eggs being speared by his sperm and mixing with his human DNA. Your human hybrid siblings rapidly forming within her.

You continue to cum with your dad, biting his lower lip as you surrender to your release. You and Toby's moans filling the room until you start to come down from your release. The Keltraxan scientists shocked by the amount of pleasure that their test subject felt.