Cowgirl

"Cowgirl," the host announces.

Compared to some of the other demands placed on you so far, it's a very simple request. You lock eyes with Toby. Your chests are heaving in sync, his broad pecs deliciously coated with a thin sheen of sweat and your breasts rising and falling with a soft, irresistible bounce.

Toby lies down so that he is in profile to the Keltraxans. You approach him from one side, running a hand down the length of his body. He takes your hand and guides it to his engorged cock, and you wrap your fingers around it, gently squeezing it and rubbing up and down. Groans of pleasure and longing from Toby as you stroke for another minute before climbing on top of him and positioning him beneath you.

During your captivity you and Toby have explored almost the entirety of geometric possibilities for sex positions. You might not have replicated the Kama Sutra, but you've definitely ripped through the Sparksnotes for it.

Doggystyle and other more primal positions have come to dominate your repertoire, no doubt influenced by your surroundings. You've come to love nothing more than the feeling of Toby thrusting in and out of you, using your body as a vessel to be filled to the brim with his seed. The rest of your time in your habitat, with mundane affairs like sleeping, eating, and making use of the limited entertainment resources given to you by the Keltraxans, seems like filler between your intense and charged couplings.

Even so, you and Toby return regularly to the simplicity of cowgirl. You revel in the sensation it creates and you lower yourself onto his cock. It's bigger now, of course, than it was when you were dating on Earth. Not that much longer, but definitely thicker. He stretches you, pleasantly so, and you love being able to control your descent, so to speak, prolonging the sensation of that stretching.

You stare into his eyes while you lower yourself. You block out the other beings in the room, just like you do back in the habitat. It's just you and him, mates, each eager for the other's body. As your wet and swollen cunt lips press around the base of his cock and balls, you lean forward so that your tits brush against his chest and he can feel your breath on his face.

Toby's hands find their natural spot, gripping your ass of course, and squeezes you lightly. He doesn't make demands or tell you how fast to go: you are in control here. He grunts and says, "Go for it, baby."

You begin to ride his shaft. Your moans start and increase in frequency and intensity as his cock rubs against all the right spots. Despite months of use and ****, your cunt is still so tight, so ready, that each movement stretches and stimulates. When once you might have used lube, you now produce all the natural lubricant the two of you could need. Each time you slide up and off his cock, the shaft glistens with more and more of your juices. You hope the Keltraxans are enjoying this even half as much as you are.

Toby cups your breasts as you straighten your back. You're gyrating your hips now, fucking him in three-dimensions, your breathing shorter and more erratic. You're so close. You tilt forward slightly again, your ass now bouncing, slapping against his thighs as you ride him at top speed.

"FUCK!" you yell, grunting just like he was a moment ago. "Yes—oh!" Your eyes open as Toby painfully squeezes one of your hard nipples. "Yes, harder, again—ah!"

He plays more with your sensitive breasts, squeezing and cupping them while your lower body moves up and down his shaft. The stimulation tips you over the breaking point, and your orgasm passes through your body like a series of explosive shockwaves.

Your riding slows down and then stops. You lean against Toby, pressing yourself into his chest, panting from the exertion and its payoff. He's still rock hard inside you, though, and has, admirably, not even threatened yet to cum.

You're going to have to up your game.

Giggling slightly, the two of you neck and kiss and cuddle for a moment before you slide out of and off of him. His cock is so slick and shiny-looking with your juices and his pre-cum that you can't resist taking it in your mouth when you turn around. Your lips slide down the length of his shaft, and you gag happily when the head hits the back of your throat. This is what you live for now: the feelings and flavours of sex with your ex-ex. His body and yours, perfectly attuned.

Now you mount Toby again, this time with your juicy ass filling his field of vision. You lean forward, away from him, gripping his spread legs. Your clit now rubs directly against his member, and the two of you groan together. In this position, with his cock bent away from him and one of your hands fondling his balls, it won't be long before Toby succumbs. The only question that remains is whether or not you can squeeze in another orgasm before his.

It's a tight race. Toby lightly slaps and squeezes your butt, muttering something about your "delicious booty" that you have trouble hearing over your own, less coherent sounds. Every part of me is delicious, you think; every part of you is all bouncing and jiggling soft curves, the perfect complement to his own chiselled hard outline.

Toby's cock begins to pulse within you. Your cunt instinctively tightens around it, and you let out a loud moan. It's just so big and so hard. Memories of the first time you slipped a huge dildo inside yourself bubble to the surface of your mind: you remember understanding, in a way none of your boyfriends up to that point had impressed upon you, how much you fucking loved big cocks. No one—not your mother during the awkward Talk, nor your best friend during sleepovers—had prepared you for how amazing it felt to take a man's unyielding shaft inside your body.

The dildos had been an awesome first step. You trained yourself on them like a devoted priestess of sex. Then you started watching porn. You watched women performing for men, mounting and fucking them like amusement park rides. You knew it was all fake, all made up—but that's what was so arousing. The people on those screens weren't acting like people; they were acting like sex objects. And every time you fucked yourself with those fat dildos, you imagined yourself as one.

Toby had managed to please you, but ever since your arrival at this zoo and the subtle changes to your bodies, sex with him has been even better. When he fills you like this, when you take him inside yourself and ride him, you're reminded that this is what you are. Your body has this hole in it for a single reason, and that reason is filling it right now. That reason is pumping it full of your man's sperm.

"Ohhhhhhh, yeah," Toby cries out as he loses all control and comes inside you. You lean back, rubbing your ass against him but careful not to let his member slip out. One hand grips the base, keeping it firmly inside of you, while the other massages and squeezes his balls.

"Give it to me," you say—not begging, but rather as an urgent command. "Give it all to me, baby. Fill me with your thick cream."

"Oh, yeah. Oh, fuck, Nina. You're so fucking hot like this."

After what seems like forever, but is probably less than a minute in reality, he's done. You roll over and off him, snuggle up, a single hand placed on his chest. White trickles out of your well-used cunt.

Your host brings you back to your surroundings. "Well done," he says. "Very energetic. Our guests are quite pleased. Wait a moment, and you will be returned to your habitat."