An audible *pop* filled the hospital room as Redheart’s plump white marhood lips were forced open, her inner pink labia stretching wide to permit the condom-covered, hoof-sized stallionhood into the first few inches of her vaginal canal.

“AH! AHHH! Ahhhhnnnnn~..... Mmm…..” Redherat’s first yelps of tense discomfort, easy to read in her clenching muscles, slowly unraveled into a delicious purr of contentment. Like a stretching cat, she moaned in a satisfied purr as her body adjusted to his size, her forehooves reaching out in front of her on the bed as her once-tense muscles began to unwind.

“OOooh… that was… intense…” she giggled, smiling over her shoulder before winking and nodding at him. “But it feels lovely now, ‘big fella’, please… continue.”

As she said this last word, Anon felt an incredible swirling, gripping, milking clench around the few inches of stallionhood that were now inside Redheart. There was no way he could compare the feeling to anything he’d experienced as a human — no fleshlight, toy, hand or even human vagina could compare to the firm muscular control of this earth-pony mare’s cunt as it coaxed his thick stallionhood deeper into her.

Anon groaned as he did as instructed — merely leaning forward to let the gravity of his weight sink a further 3 inches into the waiting mare. He watched as she sighed with contentment, shutting her eyes and pursing her lips and shivering, as if somepony had just scratched an itch that had been plaguing her for weeks.

“Mmm… that’s it, big guy… mmm… OOO!” A new squeak of surprise as the Nurse’s eyes flicked open in surprise once again, she blinked at craned backward - as if trying to see the site of their union for herself. When it became clear she couldn’t, she glanced over at the resident voyeur, the still-watching Tender Care.

“Was… was that his medial ring?” Redheart asked Tender Care with an astounded giggle, eyes twinkling.

Tender Care nodded silently, mouth open in awe. “I… I can’t believe you fit such a big bucking stallionhood in you…” she whispered, eyes unable to detach from the site of their union.

Oh, fuck. This is insane - I never imagined that something could feel so good. Anon though,, as his whole body began to find a slow steady rhythm, like a steam locomotive gathering speed. His heavy lungfuls of air rumble through his powerful equine nostrils, ribcage heaving in and out to oxygenate the huge horse-heart thumping in his chest, which throbbed blood into his muscles and stallionhood, driving the slow but relentless pace of his muscles as he slowly sank more and more of himself into the willing nurse.

“Hmmm… ah!” Redheart purred again as more of Anon’s stallionhood sank into her. Suddenly her face went bright red and her eyes shot wide, “Uh… w-wait a… oh n~”

*PBBbbbbbbbrrrrrrrrttttt!*

A loud, embarrassing squeaking sound of escaping air causing the vibration of moist lips filled the hospital room. But this hadn’t emanated from anypony’s ponut - this was a queef.

Redheart blushed brightly, her eyes locked on Tender Care who covered her muzzle, blushing as well though tears of mirth were forming in her eyes.

“Oh please.” Redheart grunted, rolling her eyes and grinning, “You try taking a dick this big without making some funny sounds. Ooh~!” Redheart made another ‘funny sound’ as Anon slid an inch deeper into her, his cockhead nestling up against the entrance to her womb.

“S-sorry…” Tender Care half-apologized, half-giggled. She shook her head with wonder again as she watched the slow but unstoppable, dripping invasion of Redheart’s marehood as Anon continued to press forward. “He’s almost hilted into you — just… how are you taking him?”

“Oof!” Redheart grunted, recovering from another prod of Anon’s bulbous tip against her cervix. “...Not easily! But remember this thing is designed to accommodate a foal’s head… ah!” She grunted again, clenching her teeth and shutting her eyes in focus. “P-phew…”

“S-sorry…” Anon managed to grunt, without slowing his movements.

Redheart looked over her shoulder at him again with those sparkling blue eyes, her pink tail lashing back and forth against his chest. “Nothing to apologize for, big guy. Now… ah-ahn~...” she grunted before composing herself, “...n-now, I’m gonna try to let you get… ah~... a little deeper. S-so, be careful. OK?”

Anon nodded, despite the fact he seriously doubted he could instruct this body to do anything but pump.

Redheart bowed her head again, resting her upper body as she focused entirely on her internal muscles.

W-what… what the hell is… that? Anon moaned, as he felt the mare’s clenching, tight vaginal walls relaxing, sagging away from him… and incredibly the barrier his stallionhood had been battering against seemed to suddenly… part. Ever so slightly.

It wasn’t a wall he was battering against - it was another orifice, deep inside Redheart. Her womb’s entrance.

M-mares can… do THAT?

“Mmmmmmmf!” Redheart grunted into the bedspread, her face buried in the sheets as she grunted in pained concentration.

Anon felt her cervix slip slightly, then a little more… before suddenly, with a jerk of sensation that sent a ripple of shuddering pleasure through both of them:

He hilted her.

“AhhhH!” Anon wasn’t sure who whinnied first - him or her, but the triumphant bellow quickly became a chorus as he luxuriated in the incredible feeling of being entirely surrounded by hot, grasping, squishy-pink velvet mare-muscle. For the first time, he could feel the wet kiss of Redheart’s tailhole against his abdomen, and the plump squishiness of her butt against his thighs.

“Whooooooo~” Redheart gasped, catching her breath and grinning, wriggling her hips back and forth, clearly experimenting with the feel of having 18 inches of stallion meat inside of her… and enjoying it. “I think that’s a new record!” She laughed, looking back at Anon with a big smile.

Anon could only dopily grin back at her, unsure what to say.

Redheart laughed again at his expression and winked. “C’mon big boy, it’s not the size of the boat - it’s the motion in the ocean…” she wriggled her eyebrows playfully as she unleashed a ripple of muscular contraction that started at her outer lips and milked Anon’s thick stallionhood all the way up to the throbbing tip lodged in her womb.

I don’t think I’ll ever get used to that! Anon thought as he clenched his teeth and shut his eyes in sheer exhilaration from the sensation.

“Let’s go, tiger.” Redheart purred, wriggling her eyes again, “No mare likes a stallion who just plugs a hole and leaves it at that. Ahn~! …even if you’re plugging it with something so big.” She grunted with a shake of her head, before whipping her tail to slap against Anon’s backside, “C’mon, your little nurse-y wants some thrusts!”

Anon gulped, and felt his hindquarters squeeze again, slowly pulling backward, feeling the delicious suction as Redheart’s wet lips gripped his shaft, her pink labia being drawn slightly out of her body. After only a couple of inches of travel, he reversed direction, sliding back into her to re-bury himself in her depths.

“Mmm~! Yes, that’s it.” Redheart purred, coaching him.

Again and again, Anon started to see-saw, in and out, slow and steady… with each thrust pulling out a little farther… then driving home a little faster…

“Ahn! Ahn~!” Redheart’s little grunts were coming a bit faster now, about one every three thrusts. Anon could feel the nurse's efforts as he moved as well - the timing of her muscles relaxing and squeezing, the twisting milking grip loosening just as he drove home… before clenching down tight as a vice to resist him as he pulled back… the throb of her button-sized clitoris against the ventral side of his shaft.

“Hah… y-yes… k-keep it up… f-faster…” The nurse coached, though it seemed she was having trouble now with her words, needing to find enough breath to spare to continue her speech.

PIC OCCURS HERE: https://pony booru.org/images/3205724

Five inches of thick, steaming stallionhood was sliding in and out of her juicy marehood now at the rate of about a thrust per second — and this was the moment that the medial ring he had buried minutes earlier began ‘popping’ in and out of Redheart with each thrust… the wide donut of flesh stretching her lips deliciously, a perfectly designed by nature sex-toy-feature that quickly was turning the white-furred nurse into a sweating mess.

“O-oh OH f-fuck!” Redheart squeaked, her forelegs slipping and causing her sweat upper-body to collapse onto the bed as the medial-ring lewdly popped in and out of her, each time battering her throbbing lovebutton. “F-fuck!” she swore again between breaths, unable to form more coherent thoughts.

The whole hospital bed was shifting now, the wheel locks never meant to withstand the force of an earth-pony stallion in rut. Bump… bump… BUMP… BANG… BANG! The bed began to slam with force into the concrete wall of the room.

“By Celestia…” Tender Care whispered under her breath as she watched the head nurse getting absolutely railed by their patient. She squirmed herself, thighs rubbing against each other as she tried to find a way to scratch her own growing itch without overtly showing she was doing so.

“Graahh!!!” Anon yelled, as he winced from the waves of pleasure assaulting his conscious mind. With each stroke, now coming at a pace of two per second, he could feel the whole of his strikingly sensitive stallionhood getting completely milked by Redheart’s powerful cunt muscles… could feel his thick, throbbing, swollen medial ring compress to squeeze into her elastic channel… could feel his painfully blood-filled cockhead pop into her deep and encompassing womb.

Over and over.

And now, as his instincts drove him to drive into her even harder, almost jumping with each of his power-thrusts, he started to feel the heavy impact of his balls against the mare’s ass.

*Plap plap plap plap*

Wet sounds of soaking mareflesh striking swinging stallion balls rhymed with the staccato beat of the bed’s impact against the walls.

*Plap plap plap plap*

“Oh… OH!!! OHHHHHHH!!!!” The nurse’s body tensed underneath him as her little grunts and groans became more insistent, concerned… warning. Her sweaty mane had fallen out from under her hat, giving her a wild appearance as she glanced over her shoulder at him, one of her pupils blown wide while the other retained focus, looking into his soul. And then she craned her head back and let out a bellow-cry:

“~*NEIGHHHHHHHHHHH!*~” The whinny shook the room as much as their thrusts, the whole of it making her chest rumble with vibrations that Anon could feel through his own chest… but quickly the vibrations of the whinny were replaced with vibrations of another type.

The skillful and milking convulsions that sucked and pulled at him suddenly went chaotic, even as they intensified in strength and volume. It reminded Anon of when he’d accidentally shocked himself with a dog collar, how all the muscles in his arm had gone into a tonic-clonic convulsion pattern, entirely out of his control…

That was what Nurse Redheart’s body was doing now, tensing and releasing underneath him in tidal waves of force as she drew on every muscle fiber in her body. Through the haze of his own diminishing vision Anon could see the sinewy lines of muscle in the powerful little mare’s back and legs as each muscular contraction rippled through her… each focused on one act: squeezing the huge cock inside her.

She was cumming. Climaxing. Emptying her whole being on his shaft.

And it wasn’t stopping… it was just going on and on. Four clenches. Five.

On the sixth, Anon felt the nurse’s fat, swollen clit pop out of her marehood, throbbing against his shaft as her vaginal lips winked open around him like a beautiful flower…

And then she soaked them both.

“HNnnnnnnnnnggggggh!!!” Her feral groan came in time with her squirting expulsion, her back arching up and down like a cat as she let loose splatter after splatter of wet, marecum ejaculation, the hot liquid coating his swinging balls and spilling down the insides of their thighs, to form a puddle on the hospital floor underneath them.

“J-..Just…” Redheart groaned, eyes spinning wildly as she shut and opened them, struggling to retain consciousness as Anon gave her the ride of her life. “Just… f-fucking cum already!” She managed to choke out her demand.

Something deep inside him stirred at her vulgar plea… unbidden, he felt his heavy stallion balls clench and rise. The dull ache in his loins became a searing hot knife twisting in his guts as the backup of fluid in his sexual organs demanded their immediate release.

“F-f-fuuuuuuuuck!!!” He swore, as he felt the strangest sensation. His huge cockhead, already feeling so filled with his hot, stallion-blood that he thought it might pop… began to change.

There was a twinge of pain, mixed with pleasure, as the knobby bulbous end began to unfold. Anon’s head thrashed as he felt the very skin of his tip, buried deep inside Redheart’s twisting mareflesh, stretched like an overfull balloon as he began to flare.

What had once been a hoof-sized cockhead began to expand and flatten, lodging itself deep in the smaller mare’s uterus as it stretched to the size of a dinner plate, making a sizable bulge appear in Redheart’s belly, just above her belly button.

Anon’s wild eyes looked down at the sweaty mare-back under him. Looked at the wild, flowing pink mane, long undone out of the prim and proper, professional pony-tail… now a mess of sweaty strands strewn over either shoulder and the nape of her neck in his feral lovemaking.

And his eyes focused on the nape of her neck. The flesh seemed so succulent, so soft… so right.

WIthout even knowing why, Anon bent forward, parted his teeth, took a delicately small portion of Redheart’s neck-skin in between his teeth… and bit.

“Oh YES!” Redheart moaned immediately, throwing her head back to nuzzle against his bite, reaching up with a forehoof to clench his mane tightly, pulling him even harder into the neck-nip. “Yes, baby… fucking fill me!”

Her groan was so deep and needy, so hungry compared to the snarky professional she had been only a short time earlier. But Anon didn’t care… In that moment, all she was was his mare… and she needed him.

Need him to do what the Goddesses intended.

Snarling into her neck, Anon felt the most wonderful release as the first explosive rope of thick, steaming stallion-cum rocketed from his tip - beginning to fill the condom buried deep inside Redheart.

“Yes… Yes baby! All of it!” Redheart cooed into his ear, her hoof pulling his mane almost painfully, forcing his teeth deeper into her neck.

He obeyed, his power-thrusts devolving into uncontrolled, instinctive mini-hip tilts, awkward and fumbling but fast enough to occur in time with each of the ejaculatory pulses rocketing through his shaft.

It was like nothing Anon had ever experienced before - any orgasm as a human paled in comparison to the feelings of his pony-body. Each pulse felt so much deeper, richer, then the pathetic memory of the many times he’d satisfied himself as a man. The feeling of his massive balls draining from the impossibly full tension they had contained only moments before putting the shame to the same sensations of his homosapiens testicles releasing. It was like putting a pebble next to Mt. Everest.

Maybe being a pony isn’t so bad.

“Oh GOD!” He groaned, his nip releasing as he moaned into Redheart’s nape.

“Good boy, that’s it.” Redheart’s husky voice groaned into his ear encouragingly, “Every last drop.”

His whole stallionhood ached now. It hurt. The sensations and stimulation suddenly all at once overwhelming — too much for his brain to rationally handle. It was paralyzing, every nerve ending on fire as his flare throbbed in the tight, milking confines of Redheart’s womb. Ripple after ripple of her body’s powerful contracting muscles squeezed inwards, clenching tight at his cockbase and rippling in a milking squeeze up to his flared tip, eking every last drop out of him.

With a shudder, he felt the fatigue of all of his stallion muscles in a sudden wave — and his forehooves slipped under him, making him flop like a dead fish onto the nurses sweaty back, pinning her to the bed top.

“Oof!” She gasped, as his bulk came down on her, knocking the wind out of her mid-gasp. He tried and failed to command his forelegs to move, to take his weight off the smaller mare’s body, but none of his muscles would respond… his body was completely limp and spent.

“Oh my, you poor thing.” She cooed, with a chuckle, once she’d re-gained her wind. “You gave it your all, didn’t you?” She wiggled her rear, the motion making his softening cock slip and twist inside her canal in an explosion of too-sensitive, refractory-period nerves… screaming into his mind to reduce the over-loading pleasure circuits.

“Nnnnghhh…” Was all he could manage, his tongue rolling out of his muzzle languidly.

“Is he… Is he OK?” Tender Care chirped, stepping forward nervously. “He didn’t… stroke out, did he?” She was nervously picking up her stethoscope with worry in her eyes.

Redheart laughed and rolled her eyes. “I doubt it — I think Mr. Anon here is still getting the hang of his new body, is all.” She grinned and then mischievously winked at the medical student, “...or my marehood is just that good.”

“Pft.” Tender Care couldn’t help but smirk.

“That’s better, about time you started lightening up a bit.” Redheart smiled, her tail wagging with the joy of a freshly-fucked mare. “Now, lend me a hoof please. I don’t think Mr. Anon will be able to do much for a little bit…”

“Ok…”

Anon felt the dim sensation of Redheart shifting under him, carefully bracing herself to take his weight strategically onto the strong-points of her shoulders. Simultaneously, the medical student braced herself alongside him, steadying him from slipping off.

“First things first.” Redheart grunted, “Can you uh… take him out of me?”

Tender Care blushed but nodded.

“Use your magic, keep a tight grip on the condom edge, remember this is supposed to be a sample collection — we don’t want to spill anything.”

Anon clenched his eyes tighter as he felt a warm, buzzing magical sensation around the base of his cock, as Tender Care’s magical TK field held the condom’s edge tight… and began to slowly pull his semi-flaccid cock out of Redheart’s pussy, which grasped him tightly, each slippery inch trying to hold onto him as he slid out of her with a wet *POP*.

“Woah.” Tender Care chirped, “That must have felt pretty big in there!” She was staring at Anon’s still throbbing flare, the green latex tightly wrapped around it now steaming in the air conditioned hospital room.

“Hoo yeah.” Redheart grinned, her pink marehood gaping wide and clenching involuntarily… the lips still too stretched from their recent invader to seal shut. “Definitely not for beginners.”

*SPLATTER*

A wet, thick dollop of juice rushed like a lewd waterfall out of Redheart’s gaping marehood and added to the growing puddle of slick on the linoleum floor.

“Uh oh,” Tender Care gasped, “Did the condom break?”

Redheart grimaced, her ear twitching for a moment, “Uh… th-that might just be me… I feel that there’s still something inside me, keep pulling.”

Tender Care nodded and kept pulling on Anon’s flaccid stallionhood… and the condom reservoir slid out of Redheart’s gaped, well-fucked cunt. A huge, water-balloon sized, latex-surrounded, half-gallon of stallion spunk fell out of her.

“W-woah!” Tender squeaked, just igniting a second TK field in time to catch the falling reservoir before it impacted the ground. With a quick motion of her horn, her tongue poking out of her lips in concentration, she whisked the well-used condom off of Anon’s shrinking penis, neatly tying the end with a knot to trap the copious sample inside.

“H-holy Celestia,” Tender Care gulped, a deeper blush forming across her face as she marveled at the huge balloon, filled with Anon’s thick, jelly-like sample. Her nose twitched, and she glanced at the rapidly deflating stallionhood, now exposed to the air. Her nostrils flared and she blushed deeper, turning away and covering her nose. “B-buck, it smells like a high-school locker room in here.

“I know, isn’t it great?” Redheart laughed. “Don’t deny it, honey, it’s just your body’s natural reaction to some fresh stallion-musk. Anyway, Let me see it.” Redheart asked. Tender Care obliged, carefully putting the condom on the bed next to Redheart.

Redheart whistled, clearly impressed. “Might be a record,” She prodded the squishy condom-balloon with her hoof, “Twilight sure knows how to make a stallion — certified grade A stud, for sure!” She laughed.

With a groan, Redheart began to push upward, carefully lifting Anon on her back. “A typical stallion, too; completely useless once the buckin’ is done,” she chuckled. “Help me lift him back into his bed!”

With some careful coordination, Redheart using what was left of her strength and Tender Care bracing her side and using what magic she could, the two mares managed to carry the limp stallion back to his bed, rolling him off Redheart’s back and into a supine position.

“Upsy-daisy!” Redheart grinned as Anon slid onto his back, his legs on top of the covers and his stallionhood now about a quarter of its fully-erect size, still poking out of his sheath but not nearly as aggressively.

“There we go, Sweetie.” She smiled, gently stroking Anon’s brow. “You just take it easy and rest up ok?” She hummed with a glow, the frustration and annoyance that had scrunched the features of her face earlier when she had entered his room with the two doctors replaced with a glowing, affectionate compassion. “And… there we go, you’ll be feeling better in no time!” She chirped happily as she reconnected his IV and put a soft kiss on his forehead, “Once you get hydrated you’ll feel right as rain!”

Tender Care could only blush and watch, her hoofs shifting left and right and her tail wagging slightly. Her eyes seemed almost… envious.

“Come on then, Doc.” Redheart smiled, using the term for the medical student for the first time. “Samples are s’posed to be processed fresh!” Redheart nodded primly, gently grasping the condom-balloon in her teeth, and putting it into a specimen container marked with a biohazard symbol. “We’ve got to get this to the lab.”

Redheart trotted to the door, her tail wagging like a happy dog. When she noticed the medical student hesitating, she looked over her shoulder. “Coming? What’s wrong?”

Tender Care gulped and blinked, then pointed back at Anon, half-asleep and still fully exposed on his back, his wet floppy stallionhood laying awkwardly and pathetically across his lap.

“Uh, is it ok to just leave him… like that?” She cocked her head. “Shouldn’t we at least cover him up or…”

Redheart grinned and winked. “Oh, not yet!”

“No?”

“Nuh-uh.” The nurse’s eyes twinkled, “Once we drop this off at the lab, we’ll come back here and give Mr. Anon a well-deserved sponge-bath, get him all cleaned up and change those sheets.”

“Oh.” Tender Care’s tail lifted, ever-so-slightly, but enough to make the experienced head-nurse smile inwardly.

Redheart stepped up the young mare with an impish smirk. “I was thinking that you could take the lead on the sponge bath… if you wanted.” She put a hoof around the medical student’s withers, leading her toward the open door.

Tender Care blushed again, looking over her shoulder at Anon. She gulped and nodded, the beginnings of her own smirk forming, “O-okay… I guess.”

The last thing Anon saw as the two giggling medical mares left his room was Tender Care’s blue tail lifting up high, giving him a fleeting glance of her slender unicorn marehood winking as she turned the corner.

Anon groaned, barely able to twist his neck, he was so drained. But he shut his mouth, a small smile forming on his lips.

Maybe being a pony ain’t so bad after all.

Author's Note

And there you have it!

Hope you enjoyed it! I had fun writing the first half of this fic, with the medical procedures and detail and nomenclature.

Honestly when things get to the squishy stuff in the latter half of the story I often feel like I've written all before, and sometimes I get a little anxious that you readers will figure out that my super long clop-scenes are all pretty similar in structure and story beats.

I've been doing a lot of AI bot ERP writing which is a ton of fun, and the more powerful bots (GPT-4, Claude 2, NovelAI) definitely can be quite creative and spicy in how they approach erotic writing and setting scenes... hopefully some of that dripped into this fic in a new way that you liked!

As to the future... I have no idea what comes next. I'm definitely winding this kind of writing down. I'm not saying I'm 'done', but it will continue to come out at this much, much slower pace (1-2 stories per year instead of 20+ like in my heyday).

Honestly, there are some AI ERP logs I finish up where I think to myself: 'damn I'd love to share this with fimfic'. Maybe that would be a way of trying something new... taking a chat and polishing it into a clopfic to publish here.

Anyway, as always, the only reason I write is for comments, really... so please, drop me a few!

Oh... and I did have a 15k+ littlepip story I have to finish at somepoint, so there is that next I guess.