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Pregnant.

Ian was pregnant.

He... well, no, he wasn't male anymore. Not by a long stretch. Massive leaking breasts, a swollen dripping cleft where his manhood once was, wide hips and ample curves. No, Ian was a woman now, and the dome of her pregnant stomach was all the proof of that. Some bizarre amalgamation at that, a freak of nature. Long pachyderm nose, thick fur covered in splotches and stripes, an oversized bitch's spade, feline paws with keratin hoof-like pads, a heavy sloshing udder and an extra three rows of swelling breasts underneath her largest pair. A hybrid that somehow managed to continue to live when so many attempts in the past had, as far as he knew, failed tragically.

And yet this was not what concerned her the most. It was that he was carrying four children, one from each male that had fucked her, and a fourth from another that she'd not even touched. 'A triumph of science' Doctor Ayers had called it, a being so fertile her estrus would never end and the mere interaction with semen would impregnate her. Getting her cherry popped by a tiger was certain to give her a kitten, but so was being fucked in the ass by a dire wolf and an elephant, or even swallowing gallons of a bull's seed after it'd been pumped into a cow's cunt. Her body would adapt to be a suitable host and deliver the child pure and healthy in record time.

Two weeks she'd been pregnant now, but she looked ten months pregnant. She was so big and heavy, her breasts and udders so swollen with milk she needed almost constant milking, which only seemed to exacerbate the problem, and the hormones. If she wasn't going through wild mood swings she was desperately aching for another fuck, and even when she was in the midst of mood swing she still wanted to be fucked. She could do nothing about the heat, she couldn't even please herself.

They kept her secured to a bed as they ran their tests, thick leather straps holding her arms to the bed as her legs were held up in stirrups. She'd be mortified by being constantly naked and exposed if Doctor Ayers hadn't have made a specific mandate to only allow females into the room to take care of her. Though after a few days she wished one of the men would come in and plunge a cock into her, even if it meant adding another child to her growing litter.

Ian knew it would come though, it was the reason why she was here, why Master Kelgan bought a frail human like her. To make her into this so he could finally get the heir he struggled so hard to obtain. Millions spent on research to increase virility and fertility, to no avail. Every one in his employ got the same treatment, even the farm animals he owned. They had no such difficulties, the massive balls and cocks on the males a result of the experimenting.

It was a long shot, but humans were untainted by the same flaws the anthros were, and it was impossible to tell if it'd work without having a test subject. They might not survive, so why waste the money on an expensive healthy human when a cheap one might at least offer some valuable results? A few gallons of Master Kelgan's seed, modified to make Ian into the perfect brood mare to give him a son. And once she'd done that she could be used to breed rare and valuable live stock.

She was little more than property, and would spend the rest of her life as simply a means to make her owner richer. A sex slave for animals, the squeeze of a collar around her neck a constant reminder of this. And yet the thought filled her with excitement as each day passed. Unable to touch herself, unable to feel the touch of a man or his heat filling her new cunt, the need growing deeper each day, hoping the door to the room she was kept in would bring Arturo, or Reginald, or even Fenrir or Samson, or most of all, Kelgan. She couldn't stop thinking about him; the tall, muscular, virile beast of a man who had bought her. He owned her, but she wanted to be his.

Ian's ears flickered, sharp feline and canine senses hearing the knob turning before the door began opening. She didn't bother lifting her head or opening her eyes, knowing the familiar pattern by now. Doctor Ayers would come in, lock the door behind her and begin her testing while Ian could only sit around and endure it.

Yet as the door opened a scent filled her nostrils, loins clenching in response, a shiver of desire bristling her fur. It was so familiar, yet she knew she'd never experienced her master's aroma the same way she was at that moment. Breathing in his thick, virile musk with relish, her mouth salivating as she thought of the medicine that made her into this monstrosity of science.

Her chest heaved in deep, lustful breaths as Kelgan walked closer, door closing behind him and locking. The room locked off from any outside stimulus, making the horse's hooves almost echo in the room while their opposing scents clashed together and filled Ian's chest with need.

Her eyes opened, looking upon her owner. He was unchanged, but there was something so different about him. The broad shoulders, firm barrel chest, dense muscles, towering height, the lustrous shine of his molted fur coat. Each stride so purposeful, a proud man of immense power. Where she might have resented him for owning her before, she now found herself wanting him, needing him. She wanted to carry his foals as though it was the only thing she'd ever wanted in her life.

"And how is my most prized pet doing?" Kelgan said, his voice clear and deep. Her eyes watched his lips intently, desiring deeply to feel them pressed against her own. "I trust Doctor Ayers is taking good care of you. I certainly pay her enough that you should be getting only the best of care."

She felt at a loss for words, finding her mouth dangling open and drooling slightly. She would have wiped her lips, but her bound arms made it impossible. Instead he leaned in and carefully did so with his thumb, a shuddering sigh escaping her lips as electricity flooded through her body. She swallowed and sheepishly nodded in her embarrassment.

"She's... taking good care of me," Ian responded, voice cracking and mangled, the gradual transformation having damaged her ability to talk somewhat. "Wuh... what is she doing to me?"

Kelgan raised an eyebrow and grinned. "She didn't tell you?" he asked incredulously.

She shook her head in response. The doctor had mentioned things here and there, but rarely ever spoke to her as a person unless needing Ian to do something. She almost treated Ian like an animal.

Kelgan offered a weak shrug and folded his arms. "You are being made into the perfect breeder, to carry the child of any species, no matter how capable or incapable the father might be. Sterile clones like Fenrir will be able to be bred, rare, endangered animals, even give sons and daughters to those who cannot have them." A grin spread on his muzzle, striding closer he opens his arms and draws a hand to her mound. She gasped as her folds drooled with excitement at his touch, arms and legs bound but hips able to rise up and press against his thick digits. "You will mother dozens, even hundreds of young, after you've given me an heir."

Ian felt her heart flutter at the thought of carrying Kelgan's child, as much as it shamed her to feel that way. She couldn't help but yearn for him. Seeing him here, smelling his rich, masculine scent, something she'd never noticed before. Her loins clenched against his touch, aching to feel him fill her as all reason and sense left her for animal desire. She wanted to resist the urge, but it filled her mind in such a way she couldn't so much as think of her name or what she used to be. She got caught up in the heat of her lust, eyes squeezing shut and head head rolling back as she let out a passionate moan.

He leaned in towards Ian, pressing his firm abs against her growing dome. She felt his breath on her ear as he whispered, "That's my good girl. I spent a lot of money funding Ayers's experiments, and she gave me many failures, but it's worth it for this. A perfect little breeding pet; one of a kind and absolutely priceless." He took a deep breath of her scent then chuffed, his hot breath mussing her fur. "Ayers says that your psyche is starting to break under the pressure of the changes, but for a slave that will spend her life drowning in pleasure and constantly full of foals I don't think that's a problem. No, I think you want me to fuck you and fill you until all you can think of is your master's cock. That's exactly what you want, isn't it?"

His fingers kept pumping in and out of her folds, thumb rubbing mercilessly against her clit, stopping just short of her peak. Purposefully teasing to make her squirm and moan like the slut he wanted her to be. But she didn't care, it felt so right to have her owner play with her like this, lust for her as much as she lusted for him. Her trunk lifted, sniffing at his neck, breathing in his masculine musk as his commanding voice filled her ears and she felt the strength of his body against her frame. She wanted it all too bad to respond anyway other than to breathlessly moan, "Yuh-yes... hmm, please."

A rumble emanated from his chest as he let out a deep chuckle. "You're going to be such a good brood mare, aren't you?" he whispered into her ear before standing back up straight.

His fingers pulled away from her cleft, her sticky wetness clinging to his digits. She gasped from the absence of pleasure he was giving her, fog of lust fading slightly but her desire to have him still so overwhelming. If she weren't bound to the table she was sure she'd be on him, kissing him, eagerly undressing him to have him fill her. She had no control over her thoughts anymore, nor any care she was losing herself so rapidly in his presence. Her muzzle gaped open, trunk trying to get closer to breathe in his scent like an addict eager for more, all as she watched her owner begin to strip himself of his clothes.

The slow removal of his jacket and vest unveiled his bulky frame, shirt drawn close to his muscular chest. They're set aside, resting on a hanger Ian hadn't noticed and paid little attention to as Kelgan began to reveal his bare chest. His fur glistened lightly with the sheen of sweat as the scent of her estrus fills his lungs. It soon became clear that wasn't the only effect her heat was having on him, a very clearly growing bulge in his pants, growing tighter by the moment.

He chuckled as he caught her eyes fixed on his groin, turning to her to give her a clear show while his mitts undid the belt on his pants, soon following with the button and zipper. His pants popped open under the strain, and he drew them down until all that remained were all too tight briefs. They did a very poor job of hiding his genitals, the massive bulge of his orbs peeking out from the sides, the tip of his flared cock rising from the top. He pull them down too until the entirety of his length was revealed, growing faster from his thick sheath by the moment.

The length was unlike any other she'd seen on the property, even ones on the feral horses she'd seen. The girth was easily as thick as his own thigh, as it grew to full erection it looked almost as long as his leg, the blunt tip like a wide drooling saucer that dripped with pre-cum that looked as viscous as semen. Substantial veins ran up the length of the massive shaft, running over bulging medial rings. Beneath it were a pair of orbs perhaps as large as watermelons, sloshing in a tight sack covered with dark fur. It would have been terrifying, even though she was larger than she used to be, the size of his cock more than enough to split her open while his balls sure to produce enough cum it'd make her womb feel like an overfull condom. Yet she still wanted it so.

"Big, I know. Ayers gave me the first batch of an old formula, it was too potent. Quite uncomfortable, and my balls are just as sterile as they were before she gave me the dose, but she says you'd be able to carry my offspring just fine," he said, striding closer until the tip of his cock pressed up against her belly. "You're made for me. Every dose of my treated cum that Ayers gave to you just to make you perfect to carry my young. I'll probably have to force myself into you, but it'll fit... eventually."

She tried pulling away from the table, her trunk reaching out to touch the tip of his cock, but despite it's length being just short. His smell was more potent without his clothes on, she loved it, wanted to bathe in it, to have it forever marked onto her so everyone knew she was his. "Do it, fi... hmm, fill me," she muttered breathlessly, still trying to bring her trunk to his cock, unable to help herself or take her eyes off what she could see of his massive manhood.

He said nothing in return, simply grinning as both of his hands grabbed his cock. His hooves clapped on the floor as he stepped back from her, leaving a wet smear of pre on her fur, angling the tip down to her folds. The tip pressed up against her mound, the tip dwarfing her already largely swollen spade. She gasped, feeling the rush of the thick pre-cum spill into her heated passage. She pushed her hips up, groaning softly as she felt the plump labia of her canid folds trying to part for the girth, feeling more of his pre flood into her.

Kelgan chuckled, leaning forward to grip at her hips. "Eager little slut, bet you're going to be really happy as a mindless breeding slave," he whispered into her ear, his powerful hands squeezing at her thick thighs before pushing forward almost agonizingly slowly.

Ian threw her head back, crying out as she felt her too-small spade being forcibly spread open. Dull pain grew as the wide head pried apart her swollen lips, a heat of pleasure slowly building as her tightness was bathed in the gushes of pre-cum. Each jet washing into her made her walls quiver, a desire to clench down only held back by what little sense she had to relax for the monstrously large intrusion.

She banished the thought to beg him to stop, animal desire too overwhelming as the blunt tip of Kelgan's shaft pushed aside the natural resistance of her passage until a powerful thrust forced it into her. Her hips bucked and body shuddered as her aching cleft gushed in an orgasmic peak that had snuck up on her entirely, stars swimming around in her vision as her sloshing chest heaved and body tried to become accustomed to the length that had only begun to push into her.

She already felt entirely too full, Kelgan's cock filling her with an unnatural and uncomfortable pressure that was nothing like the others that had filled her. It ached and burned each moment it was buried into her, but she only wished for more against all reason. Each pulse of molten cream pumping into her making her walls tremble and loins clench, flooding her with little outlet from the air-tight seal her lips formed around the girth.

It was like a drug, head clouding further as its presence soaked into her walls and tension in her loins faded away. Heat swelled, throbbing through her that robbed her of every breath, but as she filled the pain her master's manhood had brought rapidly faded. The vice grip she had on him relaxed as her body adapted, not through sheer force like his penetration, but an almost biological acceptance.

A throb bloomed in the joints of her hips, warmth coursing through her as he grunted and began to push deeper. She could feel her body rapidly changing, muscles and tendons lengthening with the stretching of bones, each inch passing into her making her canal grow to accommodate his manhood, breasts growing heavier for the inevitable young that would join those she already carried. Her fur darkened, growing black as her snout grew out and a whinny of delight fluttered past her lips.

Kelgan chuckled and gave her thighs a swat as he pulled back, the head of his shaft pulling his spilled pre-cum towards her opening like a plunger as a medial ring wetly popped from her. "Beautiful," he rumbled breathlessly, hands sliding up her frame as it swelled and grew to fit him, coming to the shifting jawline of her muzzle. "And you're all... mine."

His fingers drifted down, pressure against her collar before she felt a sudden give. Arms and legs suddenly freed as bindings popped open. A button on her collar, there all this time, yet she missed it in all the time she'd had it on and been bound to this table.

She might have felt shame for never checking the collar, her trunk was more than capable, but shame no longer mattered to her. She'd wanted this too much, from the moment she'd woken up in this room. She earned the collar, it cemented her place; not as a slave, but as a pet. Kelgan's pet.

Ian's legs wrapped around Kelgan's body as best as they could, using every ounce of strength to pull him closer. He grinned as he yielded, hands gripping the table for leverage before he thrust the rest of his length into her, hilting fast, forcing the tip to drive right to her cervix. She stiffened, walls wildly spasming around his shaft to milk his load into her as she came, despite the deep ache filling her. A bead of drool leaked from the right side of her mouth, mind completely incapable to think of anything other than the shaft splitting open her fertile, but already seeded depths.

Kelgan leaned in, his muscular arms reaching to wrap around her body, drawing his larger frame against her gravid body. His hips drew back, the medial rings slowly dragging through her as the flat tip parted from it's intimate kiss of her womb. She almost felt like his cock was pulling her out, but as the thick bath of pre-cum pooled into her the tickle of his cream spread her open, loosening her just right to take his shaft for when he thrust in, hips broadening as the dome of her belly shifted with the change of her womb growing and deepening to accept his young.

"So perfect," Kelgan whispered into Ian's ear, powerful hips taking practiced, slow movements to pump his length in and out of her teasingly. A hand came to her head as her hair grew longer, muzzle stretching out before her. "You'll never become a horse... hmm, but you'll never lose my mark on your body. A... perfect mare for me to plant my seed. A shame to lose that sharp mind... but worth it."

His hands gripped her, one pressed into her back as the other seized her head, pulling it back as he plowed into her again. Though his cock didn't pound against her womb again like it had last time, Ian still neighed out a moan, mouth open for his tongue as he took a kiss from her. She pressed back against his lips, holding herself against him as she sucked on his tongue, her own growing in her mouth, tangling and dancing with his in an almost feral desire.

Ian's moans became muted against her owner's muzzle as his hips drew out and drove back in, each thrust pounding into her stomach making her muscles convulse in pleasure. She squeezed him in every way she could as her swollen labia winked and poured in heat, arousal and release with the tug and thrust of his cock as it forced her body to change for him.

Her mind grew dimmer with each orgasm taking her body. Memories and thought fading as she eagerly gave herself entirely to her master. Joy filled her mind while simple, animal thoughts took hold. Nothing mattered beyond Kelgan's cock and need to give her yet another child to carry, not even noticing that the motion in her clenching fists, holding onto his thoroughbred fur, was fading. Fingers melted into one another and thumbs receded to form a second set of feet.

Kelgan's pre painted every recess of the walls of her cunt, soaking into her body to banish what remained of her human form. Pleasure made it impossible to resist the changes, accepting them, torso elongating and precise limbs regressing to suit the collar on her neck. Yet it did not stop the thrusts of his stride, kiss breaking for labored breathing as his flat molars nipped at the fur on her neck, looking like little more than a pair of animals mating save for Kelgan's hands holding onto his pet.

The Pet spread open her hind legs, fore curled down to the barrel of her body as udders and swollen teats dripped with rich cream, soaking into her fur. She groaned and lowed, mewed and barked, throat hoarse with the cacophony of noises trying to pass through her vocal chords simultaneously. Glassy, dull eyes closed as she bared her neck for her mate, rocking back into his thrusts as capably as she could in her new form while the table groaned and swayed beneath their combined weight.

Instinct told her the shallow jerks of his wild thrusts kissing against her womb that he was not long from filling her. She squeezed harder, the flaring head of his shaft dragging against her milking walls, making her vice grip around his cock tighter. His dominant hands slid down her body, grabbing at her feral haunches like handles, drawing her back into each sensory wracking thrust.

Her silken walls milked him, draining his balls of any pre-cum for the all important ivory of his seed. His length pulsed and swelled inside of her, head flaring wider as it pounded into her cervix, forming a seal for a moment before tugging back. Kelgan snorted into her fur, his body covered in the sheen of sweat as each thrust made his balls shudder, forcing himself in harder and harder, to the Pet's euphoric delight, before finally hilting.

Kelgan gripped at her hind legs with dominant strength, flared tip pressing up firmly against her cervix as the once narrow opening spread open for her master. Muscles jerked and shuddered as they both came, table making concerning noises as his balls tightened up and he exploded into her. She let out a soft sigh as her body relaxed under his, eyes rolling up with the torrent of semen pumping right into the fertile, yet pregnant depths of her breeder womb.

Gallons sprayed into her like the uncontrolled stream of a busted water pipe, molten hot and heavy as it filled her. Sterile were it not for her generous eggs, ready and waiting to accept his genetic material. Millions of swimming potential lives seeking out her excess of fertility, ignoring the growing children to make room to fill her further with young. The taut skin over her womb stretched as her belly swelled, the flare of Kelgan's cock blocking any his seed might have to escape the goal of her awaiting uterus.

The Pet's body relaxed as she filled, a quiet shudder of delight exhaling from her muzzle as she fulfilled her ultimate purpose. She could think of nothing but the feeling of her master's cock pulsing deep within her with each potent jet making her stomach expand with life. Memories and thought vanished from her mind, erased save for one purpose: to be filled and give birth to children.

She was not a mother. A mother would care for her young and ensure they grew strong and healthy. She was a breeder, a living, breathing machine that existed to carry young. It was all she would be, from that moment on it was all she ever was as far as she was concerned. The man she once was had never existed as far as she was concerned, her simple mind having no conflict with the facts.

The slave once known as Ian was no longer, the simple animal that clenched around Kelgan's cock and carried over half a dozen children from separate fathers was all that remained. And she was a very happy animal in that moment as her stud rested against the burden of her womb, his weight and grip on her reminding her of his strength and the healthy children she would give him. She'd give him as many as he wished, this alpha's mare to be used by him and his herd as he willed it.

Kelgan exhaled a final, heavy sigh after many long moments of emptying his balls into the Pet's cunt, each wink and clench around his cock milking him of every last drop he had to give. He grabbed at the barrel of her pregnancy and pushed himself up to standing, cock still held tight within her widely stretched folds. He chuckled softly at the sight and sounds, a feral form marked with each of the children within her, including his own if Ayers was right.

He felt quite certain though, a strange tug pulling him towards her. Protective instinct for the mother of his young, his heir. The scent of her heat still making him eager to fill her again, yet he resisted, for the moment, instead petting at her belly. The Pet's throat trilled in delight at the feeling, gleeful in the silent praise of his pleasure for her duty. He couldn't see her muzzle, the rise of her belly too big to see past, but canine instinct made her tail wag against his empty balls.

"You did well pet. Hmm, very well indeed. I don't think I've ever been drained so thoroughly before." He looked down, tugging back, flare pulling away from her womb, a clench making his hips buck back in the surprise of sensation around his tender cock. He grinned and gripped at her fur. "So full and yet you still want more? Perfect. You'll get more, so much more as a happy, well-used slave."

He pulled back, letting her squeeze him as he forced himself free. The tip popped free from her with a wet squelch, her parted folds gaping slightly as a gentle trickle of his seed leaked from her. Indeed, for all he filled her with, and he knew from experience it was many gallons thanks to the treatments Ayers had given him, very little escaped her. Her womb held every drop it could, despite the pressure pressing against the tight dam of her cervix.

He grabbed his cock with both hands wiping the tip against her fur, what little of his spent seed clinging to his shaft being smeared on her fur along with the wetness that already coated her haunches and his body. He remained hard despite feeling spent to the point of ache, but he had prepared for this moment, knowing the effect her alluring pheromones would have on him. His willpower keenly focused on resisting the animal desire he felt.

He stepped back and grabbed his clothes, the obstruction of his cock making it impossible at the moment to cover much more than his torso, but he declined to do even that. Sweat and musk covered him from head to toe, her scent on him, but his own scent pushing it aside for his own dominant aroma. He almost felt stronger, her presence making him feel like a different man, invigorated and powerful.

Kelgan walked around the Pet's supine form pinned to the table. He came to her head and strokes at her brow, her eyes opening to reveal dull orbs, looking at him with happy, ignorant submission. Her eyes moved from his face to his cock, muzzle opening and trunk lifting to grab his cock, drawing it towards her open maw. Her tongue licked at the flared tip, cleaning it of his cream and her honey. He allowed it, willpower still in control for the moment.

"Well, it seems Ayers was right, it did break you. But that is fine. You were weak, frail, more so than other humans. But you were cheap and expendable. You're worth more this way. But you don't care, do you?" he said, head tilting slightly to look down and look a little more directly at her eyes.

She was listening, ears wide open to catch every sound her alpha made, but it meant nothing to her. Her eyes were focused on his cock, her only real concern being to please her owner and to make him cum. Perhaps he would do so in her again if she did a good job. She hoped he would.

Kelgan's teeth showed as his smile widened, free hand reaching out to play with one of her swollen teats. "No, you're too stupid to care now. Good, it'll be better for your health if you're ignorant and happy. And you'll be very happy. For now, rest, there will be more for you soon."

He gave her teat a squeeze, making milk gush from her breast, to her pleasure. He pulled away, a whine rising from her throat as he left. She wanted more, but his command, though largely too complex for her to completely understand, still resonated with her. Exhaustion filled her suddenly, eyes closing as her purpose was filled and she relaxed completely on the table, passing swiftly into sleep.

Kelgan was quite right, the Pet was very happy. Each day following her master's breeding was filled with more, not from him, but from other studs. At first they were all feral like she had become, mounting and rutting her until they were spent and she carried another young with her. Her body changed in response, marked with yet another father's genes.

She was taken from the old sterile lab and its uncomfortable bed to a new room, still air-tight sealed but with a comforting bed that she rested her ever growing dome on. Her old collar was replaced with a new one, now carrying a tag identifying her was 'Subject 353' and "Eve', but to her she was just her master's Pet.

And yet after that new collar she saw more studs. Ferals and anthros alike, sometimes multiple at the same time. A button pressed on it and they'd spend hours rutting her, releasing load after load into her without being pulled away to relieve their taut, full balls. They didn't always impregnate her, but she was too simple to understand this, simply enjoying the animal pleasures of her being used for the studs' desires.

Days led to weeks, led to months as the Pet was fucked like the animal she was, belly growing with each day. She delighted in the sensations of the multitude squirming young pressing against the walls of her expansive womb, dozens growing rapidly inside of her.

She gave birth to Fenrir's pups, two dozen in total for the litter as a pair of farmhands enjoyed her body. They did not stop for her contractions or delivery except to pull from her cunt to stuff into her ass as the other filled her muzzle and throat. There was a brief pain, but the labor was easy, even pleasurable, the pups resting in a puddle of her honey in her multiple orgasms as they slid from her.

They were just the first of many, coming to having a new child nearly every day, eagerly anticipating when she would give her master his heir. And she delighted in his attention, visiting her regularly, petting her, milking her, and when she'd gotten her new collar, rutting her regularly. She could make little sense of his words, but his pleasure and children was all she desired.

Late in the night, long after Ayers left and the studs were finished, he'd come into the room and wake her by filling her. She'd moan like the good Pet she was, milking him dry over and over, shooting his loads into her belly to make it shudder and swell. Feeding her his cum, making use of her in every way. She was never happier than she was when he made use of his brood mare.

Not until he started promising she'd be getting sisters.