FSE

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Hi everyone! This is my very first story (I mean ever, this is the first furry smut I've ever written). Feedback is more than welcome, and harsh criticism moreso! I have no idea how bad or good I am, so as much feedback as you can give is very much appreciated!

***

"Subject Seventeen, Step forwards please."

Sophie shivered, looking along the line of Females of all species, mostly looking nervous or relaxed, some chatting amongst themselves as they stood waiting to be called. Sophie felt a bit left out of this group, she was easily the youngest; most of the other females looked at least in their thirties or forties, She took sidelong glances at their mature physiques and large breasts with a twinge of jealousy. A few people stood in front of them, holding clipboards and wearing lab coats. One lady, a Lioness, prowled up and down the line. "Subject Seventeen? Please step forward."

Sophie jumped as the Lioness stopped in front of her and rolled her eyes. "Subject Seventeen, You are coming with me." Sophie nodded demurely and padded after the Lioness, her shoes squeaking embarrassingly on the sterile floors of the facility she had arrived at this morning.

Her mother had arranged the whole thing, telling the young filly that it was a small experiment. The filly had practically jumped at the chance. Her older sister was a scientist, and Sophie wanted nothing more than to follow in her sibling's hoof steps. Already she was bubbly with excitement, the chance to do experiments in a real lab! With real scientists!

Doctor Pembroke led her to a small room, sterile white with a strange metal table in the middle of the floor. Sophie scampered in and sat on the only chair, only to be given a stern look by the doctor and standing.

"Subject Seventeen, er, Sophie. Please sit up on the examination table."

The young equine complied, sitting on the metal table and gripping the edge with her hands. The Doctor continued to consult her clipboard for several moments, the silence growing steadily more uncomfortable as Sophie started to fidget. Finally the Lioness broke the spell. "You are here because your mother offered you to us, you know this?"

Sophie nodded, and giggled. "She said it was a science thing, I'm so excited!"

Doctor Pembroke rolled her eyes and looked down at her clipboard. "What else did she tell you? Do you know the nature of today's experiments?" Sophie replied in the negative, and so the Doctor continued. "Today we will be testing a new drug, one that we hope will bring joy to many thousands of people all over the world. Today's tests with you and those other women you were with-" She waved a hand languidly towards the door "-is the culmination of nearly a year and a half of hard work, five years if you consider other factors."

Sophie bit her lip, barely containing her eagerness to begin. The Lioness put down the clipboard and spoke to the small mirror on the far side of the room. "James, begin recording please."

Sophie giggled to herself as the Doctor moved to stand in front of her, speaking apparently to no one. "Subject Seventeen, Sophie Caballo. Age Twelve-" Sophie giggled and interrupted. "Twelve and three quarters!"

This earned her nothing but a stern look from the Doctor. "Please only speak when asked a question, this is important for the record" Sophie gulped, nodding as a blush spread across her cheeks. She'd already ruined the experiment, in her mind at least. The lioness smiled slightly and ruffled the Equine's mane gently before continuing.

"Species: Equus Ferus Caballus, Australian Stock Horse-" Her voice dropped to a murmur "-hmm, nice little coincidence there." The Doctor shook her head and continued. "Colouration; Light Chestnut, white star on forehead. Brown Eyes."

The doctor pulled Sophie off the table and over to a chart on the wall. "Height, One Hundred and Fourty Seven Centimetres, Weight, hmm... Thirty Eight point-two-five Kilograms."

Sophie giggled again as she was lead back to stand in front of the examination table. The lioness made some notes on her clipboard in silence before turning back to the young Horse. "Alright then, young lady, please remove your clothes. James, begin warm cycle Oh-One."

Sophie's demeanour immediately changed from bubbly and excited to embarrassed and confused. "M-my clothes? W-why?" She automatically crossed her arms to cover her chest.

Doctor Pembroke sighed. "Young lady, you must remove your clothes for the examination. Please do not continue to question us, we know what we are doing. If you like we can have your mother pick you up instead-."

Sophie squeaked. "No! I'll do what you say!" She gave a little shudder of embarrassment at the thought of being sent home in disgrace. "I'll do exactly what you t-tell me!" The lioness grabbed her hands gently and rubbed them with her thumbs. "Relax, young lady. You're doing fine."

Sophie nodded and began unbuttoning her jacket, pulling it off and leaving it on the table. Her shirt quickly followed, revealing a flat chest and taught stomach. Doctor Pembroke remained still, watching her silently as she moved to remove her skirt, her panties small and pink. The Doctor nodded, and Sophie pulled her panties off bashfully, leaving them around her ankles.

Doctor Pembroke spoke again. "The subject is pre-pubescent, although her mother tells us she experienced her first heat not long ago-" Sophie shuddered, remembering the strange feeling in her stomach as she suffered through her first estrus . The doctor continued. "-And she has yet to begin developing externally." Sophie willed herself calm as the doctor raised her arms out to shoulder height and pinched her biceps. "Normal muscle development, very little body fat. Subject is lean, well within the normal boundaries of her age."

Sophie squeaked as the doctors fingers pressed gently against her chest. "No Mammary development yet, Subject is flat. Areole one centimetre in diameter." Sophie closed her eyes as the hands moved down to her belly, squeezing and feeling it. "Abdomen normal, tight and flat, very little fat. Hop up please Sophie."

Sophie opened her eyes and gingerly climbed onto the table, jumping in surprise. Instead of the cold steel she was expecting to meet her flank, instead the table was warm and very comfortable. She giggled as Doctor Pembroke stepped forward, examining each of her legs in turn. "Thighs are thick, normal for a young horse, hips still narrow, but starting to widen very slightly. Calves perfectly fine, Feet-" Sophie squirmed as her foot was tickled "-normal."

Sophie moved to step off but was blocked by the Lioness, who spread her legs wide. Giving a little whimper, Sophie tried to close them again, earning another glare from the Doctor. Blushing deeply ashamed, she relaxed and let the Lioness prod at her virgin sex with a finger, only to blush deeper at the sudden surge of pleasure running through it. "Vagina, normal. Starting to develop, Tight Labia Majora..." Sophie moaned under her breath in embarrassment as the doctor used a thumb and forefinger to spread her tight cunny. "Labia Minora, large, hmm, larger than should be for her age. Although not outside of normal boundaries. Will not affect our experiment."

Doctor Pembroke pulled a speculum out of her lab coat, bidding Sophie lay back. Red with embarrassment, the Filly complied, laying back and staring at the ceiling as the cold steel was pushed partway into her cunny. "Hymen intact, we will leave it be for now." The steel retreated and a pat on the belly was Sophie's cue to sit up. Doctor Pembroke was making yet more notes on her clipboard, and a few moments later signed it with a flourish. Stepping to the door, the Lioness tore off the top sheet from the clip and handed it through a small slot at head high to a hand waiting beyond.

Sophie started to grow excited again, this was it, time to do real science! She smiled gleefully at Doctor Pembroke as the lioness turned around to look at the filly. "Now, we being our experiment proper. James, send William in please."

Sophie jumped as the door opened, moving to cover herself. It was unnecessary though as a body immediately blocked the doorway, pushing in a small wheeled trolley. The newcomer made Sophie blush deeply, covering herself further. A Stallion, a Draft horse in fact, wearing not a lab coat but instead jeans and a t-shirt that fitted to his dense musculature perfectly. Sophie blushed. The boy - and she continued to think of all men older than her as 'boys' - looked to be in his early to mid twenties, a beautiful golden brown colour, his white muzzle matching his feathered ankles and wrists perfectly. He pushed in the cart and stood in front of the door as the Doctor checked over the cart's contents.

Apparently satisfied, Doctor Pembroke turned to Sophie again and smiled. "Sophie, this is William, although he prefers to go by 'Will' or 'Billy' - I'll leave that detail up to you. He will be helping us today with our experiment.

Sophie nodded, not trusting her tongue to produce coherent speech, and blushed deeper. This got a chuckle from the Draft horse. "heh, she's a shy one. Pretty small too, Doctor P" His voice had the twang of an Australian accent, and Sophie giggled despite herself. He sounded like that actor from Thor. This got a smile from both of them, and the Lioness returned to her occupation with the items on the cart. "Indeed she is, William. Why don't you get more comfortable?"

Sophie watched Doctor Pembroke take a small vial and fill a syringe with a golden-coloured liquid, testing the needle for air. She glanced over to William - Billy, she decided in her mind - and squeaked in surprise. There, his sheath and balls hanging free, was a big, muscular and very naked Draft Horse! She covered herself in semi-terror as the Stallion grinned at her bashfully, scratching his neck.

Sophie suddenly wanted to go home. This wasn't science! This wasn't science at all! The filly had no idea what this was, but all she knew was she didn't want any part of it. Moving to slide off the examination table, she was stopped by Doctor Pembroke. Squealing in surprise, Sophie tried to wiggle out of the Lioness' grip. All she got for her effort was to be pushed rather hard backwards. The doctor's voice was frustrated and cold. "William, please hold her down." She struggled as her wrists were suddenly gripped by strong Equine hands, the feathering of William's wrists tickling her hands as she thrashed. He dragged her arms towards the corners of the table, where strange metal loops sat against the steel. He pulled, and stopped. "Uh, Doctor P... She's too small, she won't reach."

An exasperated sigh was the Lioness' reply. "Ugh, James, release the shackle cords please." A clunk reverberated through the table as Sophie wriggled, and the shackles were released from their indentation. Billy let go of one of Sophie's wrists to grab the opposite shackle, leaving her to punch and scratch at his arm, chest and belly. Not even enough to bother the big Stallion. Pulling the shackle towards her wrist, a thick steel cord following it from the hole in the table, he quickly clamped it to her wrist, letting to and grabbing her other.

Soon enough she was strapped hard to the table, the shackle cords tight enough that she couldn't move her arms or legs, in an X-shape against the steel. She instead lifter her stomach, thrashing her head back and forth. The Doctor stood over her, while William had retreated back to his station in front of the door. Sophie thrashed her head violently. "Please! I don't want to do this anymore! I want to go ho-ooome!"

Doctor Pembroke sighed in annoyance. "Too late, Miss Caballo, you agreed to take part in our experiment. William?"

Sophie continued to wriggle and lift her buttocks off the table as Billy moved forwards, standing behind her head. His huge, strong hands gripped her thrashing head and held it still, although her body continued to move as best it could in its restrained position. She opened her eyes wide and screamed as only a little girl could, causing both of the rooms other occupants to grimace.

Doctor Pembroke sighed in annoyance and produce the syringe from before. "Okay William, hold her quite still!" With little warning she jabbed the needle into Sophie's neck, causing her to squeal in pain. Looking up at the Stallion holding her as the needle was pulled out, her eyes welled with tears. Billy was looking back down at her with a kind smile, despite what was happening. His smile, combined his deep black eyes, was enough to calm her down immensely, and she stopped thrashing.

"Good, The initial injection has taken effect. Time is Eleven-oh-four. Subject has calmed down noticeably. William continues to hold her head however. William, please remove your hands"

Billy let go of Sophie's head, and she whimpered as his kind face retreated to replaced by sterile ceiling and harsh lighting. She continued to wiggle, although much more gently. Her tongue felt thick, as though her mouth was filled with marshmallows, and her whole body began to feel uncomfortably warm, despite the coolness of the room.

Doctor Pembroke's voice cut through her calm. "Oh-kay, she's calm. Eleven-oh-six am, administering second injection" Sophie squealed again as a second jab, this one directly on her vaginal lip, sent pain rocketing along her pelvis. Billy patted the side of her head, although she couldn't see him, and he whispered soothing words in her ear, not fully understandable. As soon as the needle was removed, her entire lower body felt even warmer, and soon it had spread all the way through her body.

She wasn't sure how long she lay there, occasionally twitching, as the chemicals took effect in her body. Her mind fogged, her vision clouding slightly as her cunny started to twitch. Doctor Pembroke's voice cut through her reverie once again. "Eleven-oh-Nine AM, Subject's body temperature risen significantly, her Vaginal lips have begun to wink. I believe she is fully in heat now."

Sophie Shuddered, She knew of heat, having experienced it once before, but it was nothing compared to the deep aching need in her belly. She shuddered, Her mother had yet to give her the 'birds and the bees' talk, although she had learned the clinical details behind sex from her school, so the deep need inside her had no reasoning behind it, just a great yawning desire for... something.

Doctor Pembroke spoke again. "Alright, William, it is time." The hand retreated from stroking her cheek, and she lifted her head to see Billy standing at her feet, his fully erect cock slapping against his abdomen. Sudden fear gripped the filly, and she began thrashing anew. "Wait! Wait! Please! I don't wanna! I wanna go home! Please! I'm only a kid! Please! I don't want to do this! I'm only twelve!"

Billy froze, turning to stare at Doctor Pembroke as Sophie thrashed. The lioness waved a hand dismissively. "Yes yes, she's just a kid, but we have full permission from her mother, this is all perfectly legal. Go ahead William." Sophie gasped at the implication. Why would her mother sell her out like this?! Why would she agree to let these... monsters rape her?!

Billy turned back towards her with a soft smile. Towering over her, he leaned forwards, resting his hands either side of her small body. Sophie's head thrashed, panic-filled, as she felt the flat head of his cock bump up against her too-small pussy lips. She gave a sudden moan of desire, as Billy chuckled and Doctor Pembroke clapped her hands together once happily. Sophie continued to wriggle, although her efforts were growing less and less as each moment passed. Billy did not attempt to go further than rubbing the head of his cock against her lips, and after a few moments Doctor Pembroke stood up in frustration. "William, we don't have all day, will you just achieve penetration already?!"

Billy looked back. "Doctor P, come on, it's still her first time. Let me handle it okay?"

Sophie shuddered again as the Lioness sat back down. "Very well, but don't take too long with your foreplay."

Billy nodded and resumed rubbing his head up and down Sophie's winking slit, causing her to moan out again, her body traitorously holding itself still as the pleasure from such a simple touch reached her brain. Her mind knew this was wrong, that she was just a child, but those thoughts swirled around on a sea of heat-addled need.

Finally, after what felt like an eternity, Billy stopped rubbing his cock against Sophie's lips, and started pushing in slowly, causing her to open her eyes wide and scream - half in pleasure and half in pain - as her pussy was stretched wider than it had ever been.

An exasperated sigh came from the corner that housed Doctor Pembroke as Sophie's breath caught in her throat. "Finally! Eleven-fourteen AM, Initial Penetration. Subject has calmed down significantly, although she still seems reluctant. However, since she is the only technically-unwilling participant in this experiment, I chose to record this as an anomaly. Temperature in the right range, uh... heart rate elevated. She appears to be in the middle of a full blown Heat cycle. This the exactly the result we've been waiting for. Continue please, William."

Sophie moaned again as Billy started penetrating her further, screeching in pain as her hymen was torn, transforming her from a virgin filly to a Mare. Billy continued as she pulled against her restraints with all four limbs, finally hilting inside her as her traitorous pussy produced thick streams of fluid, coating the meat inside her and running down the crack of her buttocks. Moaning in fear and pleasure, Sophie lifted her head enough to see the junction of cock and cunny, almost fainting at the sight of her lower abdomen bulging.

Billy began a slow rhythm now, dragging his cock painfully slowly out of her cunny and then equally slowly pushing it back in, causing her to squeal in pleasure. The older stallion leaned over her body and kissed her on the lips. Her first kiss, not what she'd imagined. Of course, none of this had factored into her prepubescent daydreams, but she kissed back hungrily, he mind clouded.

Starting to get a little faster, although just as controlled in his thrusts, Billy broke the kiss to look deeply into the Filly's eyes. "What do you want, Sophie?"

Sophie panted, her mouth still full of marshmallow as she tried to get words out. "I... I..."

Billy grinned, and paused with his cock hilted inside her as she struggled to think of the right words. He chuckled and helped her along. "Would you like me to keep fucking you, Little Filly? Do you want me to keep fucking my cock into your cunny, and fill you with my warm cum? Is that what you want?"

Sophie nodded as best she could, finally finding the words and getting her tongue and lips to co-operate. "YES! I... please! F-fuck my... Cunny! P-put your Cum into me!"

Billy grinned as Doctor Pembroke laughed, and started his rhythm again, but gone were the slow gentle thrusts. Instead he began a hard, fast pounding of her newly-stretched cunt, huffing as he looked down at her. "F-fuck you're tight... You're the tightest Mare I've ever been with."

Sophie strained at her shackles, all thoughts of escaping the experiment gone, replaced with sheer ecstasy. "Pleeeeeassse Billy! F-fuck my... tight... CUNNY!" He hips lifted her buttocks off the steel table, trying to get as much of Billy's cock into her over-tight pussy, each thrust kissing the tip up against her cervix.

Billy huffed, pumping hard into the 12-year-old now as she writhed and moaned underneath him, the shackles clanking against the table as she pulled at them with her arms and legs. "Y-you want my cum inside you, Little Filly? You want me to pump you full of my big Draft Horse Cum? Do you want me to knock you u- er, get you pregnant?"

Sophie moans louder, almost screaming as the sensation of having her pussy filled pushed her closer and closer to the edge. "YES! Knock me up!" Billy grinned at her and turned to Doctor Pembroke. "She's smart, a fast learner." The lioness replied with a smile. "Indeed she is, she's top of her class in almost everything. Shame really."

Sophie moaned, the mention of her school sending a shiver through her spine as she imagined herself, clear as a photograph in her head, with her school uniform on, her bulging belly bursting out of her school uniform just like the girls on that TV show. Another image flashed through her head, one from her health class, of Sperm surrounding an egg inside a female's womb. Both images were enough to push her over the edge, and she crashed, her pussy growing vice-tight around Billy's cock and her stomach cramping as Doctor Pembroke moved towards the rutting pair, unlocking the shackles from around the screaming filly's legs, and causing her to instinctively lift and wrap them around behind Billy's buttocks. He huffed, still thrusting into her contracting pussy. "Here it comes, Sophie, here comes your Foal!"

Sophie orgasmed again, this time nearly blacking out as she screamed semi-coherently. "DO IT, GIVE ME YOUR FOAL. PLEASE BILLY, FUCK MEEEEEEE!"

With that, the Stallion Pushed into her as far as he could, his cock throbbing as rope after rope of thick, potent cum was deposited directly into her womb, the small space quickly filling to bursting point. And burst it did, as the remainder of Billy's cum was forced past her lips and down the crack of her buttocks, she lifted her hips desperately, instinctively keeping her pussy elevated, still wrapped around Billy's torso. A third, smaller climax washed over her and she collapsed, the pleasure and sensations too much for her as her vision clouded and she blacked out.

Doctor Pembroke huffed, standing up and removing her hand from inside the waistband of her pants, quickly straightening her glasses and lab coat and wiping her hand on the inside of her jacket. "Uh... hmm, um... Eleven-fifty-seven, Subject has been, uh, mated successfully. William stay where you are, don't pull out yet. Um... ah... Subject experienced, uh, two climaxes-" "Three." "-Yes, Three, thank you William. Male catalyst has successfully cu- ejaculated inside of her, and subject has appeared to have passed out. We will continue to monitor her for the duration of the experiment. James, end recording please."

***

Sophie awoke some time later, clothed in warm soft cotton panties and top, sleeping in a nicely furnished room. Lifting her head slightly, she panted and looked at herself. Someone had cleaned her off, although the tenderness of her cunny would probably remain for several days. Pushing a hand down her pants she moaned slightly at the feeling of her previously tight pussy splayed into a o-shaped hole. Leaning back, she whimpered, unsure whether to cry or rub herself to orgasm.

"Ah, you're awake, excellent. Quite a day you've had my dear." Sophie whipped her head around to see Doctor Pembroke, a wide, kind smile on her face. The filly buried her head in her pillow as the lioness moved to sit next to her, stroking her back as the first sobs pushed their way through her nose and mouth. "Shh, it's alright my dear, don't worry, this will be all okay." The doctor gathered her into a tight hug, cooing and rocking gently. "It will be okay, you'll see. You're going to help thousands of couple get the babies they want. Thanks to you, there will be so much more love in the world." Sophie sobbed, but quieter as the thought runs through her head.

Doctor Pembroke held her until her sobs died down, and pushes her away to look at her tear-stained face. "Good girl... You are doing a great thing here." Sophie smiled weakly and nodded, letting go of the Lioness as she stood and stepped out the door.

***

"Mrs. Caballo, right this way please."

The Stock Mare smiled at the Lioness leading her past a row of identical doors, chatting to her amicably about the weather and recent revelations regarding certain celebrities' transgressions, until the Doctor stopped her outside a door. Pushing it open to reveal her darling daughter, moaning whorishly as she took the cock of a massive Draft Horse Stallion deep into her throat, her little fingers pushing into her pussy lips.

Doctor Pembroke smiled at the woman's shocked expression. "The drug worked better than we ever hoped, a little _too_well, truth be told. Your daughter has become rather wanton this past week. William, you may go."

The Draft Horse grunted and suddenly pulled the Filly's head down onto his cock, and she squeaked as her nose hit his pubic bone. Panting, Billy looked towards the two new females and grins, biting his lip as he filled the poor abused filly's stomach with his seed. "Huh... huh... okay, okay, Doctor P, I'm g-going" He pulled his softening shaft out of Sophie's throat, patting the spluttering filly on the cheek as he stepped down from the examination table. "Nice to meet you, you must be Sophie's mum, I can see where she gets her looks." With that, he walked out of the door, a trail of cum following him along the floor as the panel closes. Mrs. Caballo watched him leave, the blush on her cheeks making Doctor Pembroke giggle. "Is he available to stud?"

The Lioness laughed. "Unfortunately not, although of course he already has. Sophie, come here please."

Sophie turned around, and jumped when she saw her mother, although a lot less bashfully than expected. Her pussy dripped arousal and cum ran down her chin as she stared at her mother. The older mare smiled back. "Hello sweetie, got a hug for me?"

Doctor Pembroke smiled and spoke up as the younger filly fell into the older's arms, smearing cum across her blouse. "Come, we'll talk in Sophie's room, much more comfortable." She lead the two to Sophie's new home, decorated by her in the past week with boyband pictures and images of pregnant females. Sitting them both down in each other's arms, the lioness smiled and produced a sheet of paper. "Today, blood tests confirmed that Subject Sevente- uh, Little Sophie here is indeed pregnant." She smiled at the gasp from both mother and daughter, Sophie's face making the Doctor secretly proud that they record her every moment in this room, so she can watch it again.

Sophie's mind raced. She was pregnant! This was wonderful! And her mother was coming to take her home! She sniffed, tears welling in her eyes. She looked at her mother as the doctor continued. "Indeed she is, and of course since William was our test breeder, he will indeed be the father. Of course, we need to keep her here for the remainder. One of the side effects of the drug is that it causes almost mind-melting-" The lioness coughed "-sorry, probably should use a better adjective, er... 'Inhibition retarding', yeah, that works, Inhibition retarding arousal. We want to keep Sophie around until we are sure it won't hurt her too much."

Mrs. Caballo nodded. "Of course, as long as you need."

Sophie was shocked, her mother was going to_leave her here?!_No... no no no... this wasn't right! She wanted to go home, to be with the family that loved her, her mother, her sister... Not here in this little room with only Doctor Pembroke and Billy to keep her company. Her thoughts surfaced long enough to hear Doctor Pembroke continue. "and, of course, if it is indeed the case, we'd like to offer her more partners of different kinds, to see what it takes to sate her."

Sophie blinked, not quite understanding as he mother chuckled. "Of course, as long as you promise they won't hurt her."

The lioness nodded as Sophie turned to her mother, tears welling in her eyes. "M-mum... why did you do this?"

Mrs. Caballo's eyes were kind, filled with love as she stroked her pre-teen daughter's cheek. "Oh darling, I had to! Your sister... she's nearly THIRTY, and all she's interested in is that awful science-" She looked to the Doctor apologetically "-Saving your presense, Doctor. I want grandchildren so badly, but by the time you are old enough to have them, I won't be around for long to enjoy them." She ruffled Sophie's mane and continued. "So when I saw the ad for this experiment, I thought it would be perfect! And it is! Now you be good and do exactly what Nice Doctor Pembroke tell you do do, okay sweetie?" With that, Sophie's mother stood and followed the lioness out the door.

The filly let out a wretched sob, clutching her still-flat belly and curling up on the bed. Her mother's words ringing in her ears as a familiar yawning sensation builds in her loins and lower belly. Her tears dry up as she huffs and starts to touch herself, having just enough presence of mind to press the call button above her head.

Minutes later the door opened and she felt the strong hands of Billy pick her up and carry her back to her metal table...

***

"... And here we have Subject Seventeen, Sophie Caballo, one of our most successful tests. She's six months along now, and with triplets no less!" Sophie barely heard the voice, or the subsequent murmurs of approval from its addressees. Occupied as she was.

Moaning in need, her screams of pleasure muffled by the wolf's knot locking her mouth and throat quite closed, she sucked on it with the expertise of daily practice. Her throat gave a twinge of protest as the canine tip filled her completely over and over.

They had not needed the restraints for long after her first breeding all those months ago, and her free hands milked another two shafts, the species of which slipped her mind at this very moment, her thoughts blinded by lust as they were.

Luckily the table of her examination room was not against her back, the heating having broken the day before. Instead she was lying against the chest of a muscular Donkey, a recent volunteer to the program, his thick cock reaming out her anus from below.

But best of all was Billy, pounding away at her now pathetically loose hole. The sloppy sounds of an overused pussy reverberating through the small room. Billy had been by her side since they had first mated, and he even joined her at the Lamaze classes she attended, getting her body ready for birth.

Closing her eyes, she heard another voice, obviously masculine, cut through the sound of their small orgy. "Six months?! She looks ready to burst!"

The first voice, a bright feminine tone, replied, emphasised by a hand resting against her belly. "Indeed she does. Triplets from a Draft horse will do that. We gathered invaluable dosage data thanks to this one." The paw slapped Sophie's grotesquely swollen belly gently, sending a jolt of pleasure through her core.

'Grotesquely Swollen' was perhaps the best way to describe the rounding of the pre-teen's stomach. It was large enough that she could barely walk unassisted, and even sleeping on her side was heavily difficult. She let out another moan as she climaxed around the thick shafts buried deep in her anus and pussy. Hands snaked around from underneath to grab at her breasts, already swollen to nearly triple their original size, giving her a nice, but still quite small A-cup. She arched her back as best she could and groaned as fingers pinched her nipples, sending a shock of pleasure through them and a ripple of laughter through the assembled spectators as milk squirted from them, dribbling down her sides.

"I must say, very impressive, Doctor Pembroke! You will receive quite the bonus for this year, I think" Came the masculine voice again, satisfaction filling his tone.

"Thank you, Director." Replied the familiar voice of Doctor Pembroke. "It has been a gruelling several years. I can safely say that the bonus is seeing our hard work paying off. Come, let's leave them alone."

The sound of shuffling feet and murmured conversation followed the entourage out, and the door closed just as the cocks in Sophie's hands blew their load, coating her face and neck with warm semen, followed quickly by the shaft locked in her mouth. Gulping down what would be her breakfast, the filly screamed louder as her pussy and anus contracted around her two equine lovers, making them pound her harder and causing her breasts and belly to bounce uncomfortably.

Dropping her hands to rub cum into her gravid girth, she whimpered. It had indeed been a gruelling few months, but there was nowhere else she'd rather be.