Quite Contrary

by Postmodern

Rating: mature
Tags: Non-consensual, Princess Celestia, Sex, Twilight Sparkle, Profanity, My Little Pony: Friendship is Magic, Dark, Human, Drama, Original Character, Porn, Fetish
Length: 22632

Mary bites off more than she can screw as Twilight's claws sink deeper into Celestia's thick ass. Secrets are revealed and dark pleasures abound in Mary and Celestia's final story...for now.

Twilight revels in her successful vengeance, toying with Dr. Mary Parvotti and the shellshocked Sun Princess Celestia as her civilization-destroying plan continues apace. The two lovers will have to use every trick in the book to keep their souls out of the young alicorn's lusty clutches, but all is not as it seems. One way or another, everything ends here, with the fate of the world hanging in the balance. No pressure.

Tags: futa, non-con, ageplay, autofellatio, anal, anal worship, cum inflation, D/s, cunnilingus, mindbreak, pony on human, squirting, dirty talk.

This is (not quite the) final story in the Mary and Celestia series. For those who've read the whole thing (it's pretty much a novel length at this point), thanks for sticking with me. Look forward to more, both with Dr. Parvotti and elsewhere.

Derpi ID: 2818262

Published 2022-08-10 02:30:01 UTC
Last updated 2022-08-30 05:06:55 UTC

Chapter 1

A drop of saliva fell from Twilight’s panting mouth, glistening for a perfect moment in the midday sun before landing with a splash upon Sun Princess Celestia’s rooting muzzle, still buried within Dr. Mary Parvotti’s reddened and sensitive snatch. Mary groaned from beneath the younger alicorn’s soaked haunches as she tried to push the snow-white head away, understanding the need to keep her wits about her instead of succumbing to that talented tongue, but the Princess had not been given leave to stop.

And so, Celestia continued to slurp up the thick cunt cream that bubbled from deep within Mary’s soft-furred hole, even while the tide rolled over the three of them, washing away their combined juices as the Atlantic went on with its ageless rhythms. The Princess didn’t even slow down when the waters covered her face, so irresistible was the compulsion to obey the young alicorn she’d wronged. Celestia and Twilight had both been waiting three hundred years for this penance, and not even the power of the sea would untangle their newly twisted bond.

The smell of brine was intense — much more than usual, even this far out into the surf. The sharp aroma burned Mary’s nostrils, and she found her eyes once again drawn to the shining glyphs of compressed sodium chloride floating in the air up and down the beach, each one depicting a cutie mark from one of Twilight’s companions. The receding tide rolled meekly underneath the beautifully-crafted crystals, as if afraid to disturb their terrible purpose of extracting the salt from the world’s oceans, leaving them sterile and dead.

Mary didn’t know if Twilight was one to bluff, but she couldn’t afford to call it, not yet. Despite the young alicorn’s pronouncement, there was still negotiation to be done. As long as the doctor was still breathing, she could change their fate.

That was assuming Mary wasn’t fucked into a coma. With two insatiable alicorns around, anything could happen.

As the tide went back out, Twilight watched her former mentor devour Mary’s cunt with a deepening look of disgust. “That’s enough,” she finally snapped in her high-pitched voice.

Instantly, Celestia raised her head, addressing the young alicorn like a trained Malinois waiting for instructions. Her mouth was slack, and her rainbow mane was disheveled in a very un-royal fashion, but her eyes were clear and bright as she stared at Twilight with heartbreaking love. It was as if she’d found her true place, there under the hoof of her former student, though Mary hoped the Princess was actually keeping her head in the game instead of indulging in self-flagellation. The doctor wasn’t sure if she could do this alone.

And yet…instead of enjoying Celestia’s servile posture, Twilight’s loathing only seemed to grow. With a snarl, her stubby horn flickered, and the Princess flew backward, tumbling end over end before landing on her prodigious rear a few yards away, her legs splayed apart and her stiffening three feet of cock pointing at the younger alicorn like an accusing finger. Not a sound of protest came from Celestia’s lips as she sat up on the sand; she only stared back at her former student expectantly.

Twilight’s face twisted into an angry sneer. “What did I ever think I could learn from you?”

Celestia visibly flinched at the cruel remark, but she remained silent.

“Pleasure yourself,” Twilight growled, her cheeks still reddened with a dangerous combination of lust and rage. “That’s all you care about, isn’t it? Go ahead. Show me how a so-called Princess finds relief.” Her voice lowered to a venomous hiss. “But don’t you dare come. I forbid it. If you orgasm, Celestia, I’ll consider it a flagrant breach of our agreement. I hope you’ve learned some self-control since last time, and not just for your own sake.”

Mary started to protest, but she hesitated when she saw that Celestia didn’t seem particularly worried. Far from it, in fact — the Princess’ hips flexed, and her massive cock pulsed as it straightened, the flat crown slowly raising higher and higher until her prick became a pink tower, claiming royal ownership over everything in its shadow. Her fat nuts ominously lurched, ready for action despite the admonition. Though she’d already come multiple times today, Mary expected the alicorn could still inseminate a medium-sized village with a few gallons left over.

The doctor heard a quiet gasp, and she swallowed a chuckle. Even Twilight seemed taken aback, intimidated despite herself by the majestic slab of Princess meat before her.

Maintaining eye contact with her former student, Celestia bent herself almost double, pointing the head of her cock directly at her own drooling mouth. Her maw spread a little more, and that eerie tongue snaked out, tasting the dribbles of precome that were already dripping from her slit and running down the shaft, splashing messily upon her heaving balls. Then she opened even wider, almost dislocating her jaw in the effort to engulf the first few inches of her prick, yet moaning in bliss as she worked her head down like a feeding snake, further and further, forcing as much cock as she could into her own tight gullet.

Twilight slowly approached the older alicorn, utterly fascinated by the sight of Celestia swallowing herself. She listened to the loud, wet glucking as the Princess moved her hungry mouth up and down the first third of her cock, twisting her head at each stroke for maximum gratification. Celestia made it sloppy, not caring one whit that her chest, face and crotch were covered in her own secretions. She had been given a direct command, and she would carry it out with consummate skill.

“Aren’t you ashamed?” Twilight asked as she watched Celestia’s self-fellatio, a mixture of awe and horror in her voice. “Aren’t you disgusted? You’re sucking your own p-penis! Is this the wise Princess I devoted my life to? I must have been blind!”

Celestia gurgled something like a whimper as she received Twilight’s insults, but she only increased the pace of her throating, loving herself as if her cock was the only thing in her universe. Mary watched closely, hunching her own hips in sync with the Princess’ motions and wanting with all her heart to tell Twilight exactly what she could do with useless concepts like shame. Instead, she held her peace, knowing that the young legend needed to see for herself the power of unrestrained lust.

Maybe Twilight thought she was immune. Maybe she figured she’d seen the worst of it, on that terrible day three hundred years ago. She wouldn’t be the first pony who carelessly tried to handle Celestia’s passions, only to find their souls utterly consumed in the Princess’ unquenchable bonfire. But now, watching Celestia satisfy her urges with animalistic fervor, it seemed that Twilight was beginning to understand the depths of her former mentor’s depravity, and she wasn’t quite sure how to handle it.

Mary felt a mote of hope in her chest, infinitesimal yet hot as the sun. If Twilight really wanted to know how Celestia got down, they could teach her. They could learn the fuck out of her. It was just a matter of making their arguments appropriately convincing.

“Why don’t you take a closer look?” Mary called out, capitalizing on Twilight’s uncertainty. “She won’t bite…unless you’re into that shit. I’ve got no idea what you’ve been up to in these past few centuries, but I imagine you’ve never seen anything like that…have you?”

Twilight shook her head with wide-eyed wonder as she took in Celestia’s display, causing Mary to release her chuckle. But she resisted the urge to invade the young alicorn’s personal space, in order to guide her with her own human hands — as surreal as it all felt, this wasn’t a dream, and there was no telling how Twilight would react to such a provocation.

For now, at least, it seemed that such a drastic step was not yet needed. Driven by Mary’s words, Twilight squatted to her haunches in front of Celestia, deliberately spreading her thighs so that her dripping, cream-filled twat was on full display. The Princess took in her former protege with a famished look while she crammed another few inches of her massive cock down her own throat, at last reaching the halfway point as she groaned in satisfaction.

Twilight touched her marble-sized clit with a hoof, and she gasped as a spurt of cream squirted from her cunt, painting the lower part of Celestia’s fat prick with her fragrant juices. The Princess’s obscene tongue instantly lashed out of her mouth, collecting as much of the spending as she could reach while she redoubled her efforts, devouring herself as though she would never taste anything better.

“Does this look familiar?” Twilight asked, spreading herself wide to show off the rivers of thick come oozing out of her stretched-out hole. “It’s not quite the same as it was, but I’m sure you recognize it. Don’t you?”

A sudden throb went through Celestia’s cock, and splatters of precome gushed uncontrollably from her overstuffed mouth.

“That’s what I thought,” Twilight whispered as she rubbed herself faster, adding her contribution to the puddle of silky cream on the sand below. “I used to be so tight, you know? Couldn’t even get a crayon into my little slit, although you would have loved to watch me try, wouldn’t you? There’s meek little Twilight all alone in her bed, toying with strange feelings she doesn’t yet understand, desperately waiting for her perfectly trustworthy mentor to give her a guiding wing. I’m shocked you held yourself back as long as you did.”

Twilight reached out and grasped Celestia’s frazzled mane with one sticky hoof. The Princess’ throating became shallower and shallower, until she no longer went up, only down her fat shaft. Celestia sputtered and coughed, and tears ran down her cheeks as her former student began to apply pressure, forcing yet more savory meat past her lips.

“I used to wonder what it’d be like. Losing my virginity, I mean.” Twilight spoke in a wistful, yet bitter tone as she pushed Celestia’s head further, still exposing her dripping cunt to the ravenous Princess. “Who would my lover be? Would they be gentle and experienced, carefully guiding me over the threshold of marehood? Or would the affair be torrid, introducing me to pleasures I never could have imagined?”

“I can guess,” Mary almost said.

“You broke me open,” Twilight murmured, her voice growing huskier as she put her face closer to Celestia’s, almost nuzzling the freakishly stretched-out mouth in her eagerness for a front row seat to an unforgettable sight. “You tore me apart, body and mind. No wine, no candles, no flowers or sweet nothings. Just a cold, hard dose of reality for poor, naive Twilight, all the way to my cervix…and beyond.”

Her other hoof touched a spot high on her trim belly, and she shuddered within the memory. Whether it was one of pleasure or pain, Mary couldn’t tell.

And that was what made Mary’s heart beat faster. The young alicorn hadn’t even seen it coming. One moment, she was having a pleasant conversation with two of the most important ponies in her life, about a breakthrough that might have re-written the textbooks on Canterlot psychiatry. And then, before she could blink, she was being mounted…assaulted…fucked by the one pony she trusted more than anyone. More than herself.

She might as well have been raped by her mother. Worse, she had come there at the end, weeping and struggling in her confused pleasure. Mary suspected that was the part that really messed up Twilight’s head, beyond even the betrayal and physical destruction. If things had been different…if Celestia had approached her student with love and tenderness, instead of blind fuck lust…what might have been? Could such a strange sexual relationship have worked?

They would never know. All that was left was crushing regret.

Celestia was getting closer to the bottom. She retched and sputtered, causing more throat slime and precome to drip onto pulsing balls that were already brewing a fresh, hot load, but Twilight was merciless as she forced the older alicorn to take every sticky, throbbing inch of Grade-A horsecock.

“Choke on it,” Twilight said in a gentle tone. “Choke on it, Celestia. Choke on it.” She pressed with unnatural strength on Celestia’s struggling head, and both her and Mary watched closely as the wide, fleshy base began to fill the Princess’ mouth.

“Choke on it. Choke on it. Choke on it.”

The wet, sticky sounds coming from the bulged-out throat were pure sex to the doctor, and she felt her own heat rising higher as Celestia’s maw went lower, finally touching the foundation of that monstrous prick.

Celestia had consumed the whole thing. Not a hint of mottled pink remained exposed to the ocean air. Her searching tongue laved her own salty nuts, big as beach balls, and they lurched in response, dangerously on the verge of delivering what was sure to be much more than a mouthful.

It wasn’t the first time Mary had beheld such a sight…or the second, or the third…and usually the process took a good bit longer, but she still found herself utterly fascinated by alicorn physiology. Celestia’s horn remained dark; her efforts had been more or less her own, without any magical assistance other than the passive energies infused into every cell of her ageless body. The Sun Princess was a natural cumslut, a cock hound born and bred whether she was giving or receiving, and not even Twilight could hide her grudging admiration.

“Fifty years,” Twilight breathed as she marveled at Celestia’s shameless indulgence, one hoof still stroking her own gushing cunt while the other held the Princess’ rainbow locks in an iron grip. “For fifty years, I isolated myself, attempting everything I could think of to get you back to normal. Because of course, the monster that ravaged me in your chambers wasn’t actually you, you know? It couldn’t have been. Something in the poison joke must have affected your mind. It all made perfect sense at the time. Even now, when I look at your pathetic face, I want to believe it was all a silly mistake that I could have fixed, if only I’d been able to find the root of the problem.”

Mary had to keep reminding herself that there was a very good reason Celestia chose this pony to be her successor. Someone with Twilight’s rational thought processes wouldn’t have immediately blamed the effects of a psychotropic drug on its victim, especially one laid low due to Twilight’s own slack. She would have done her due diligence before rushing to conclusions.

“I tried everything to replicate the effect,” the young alicorn said, confirming Mary’s thoughts. Twilight seemed fixated on Celestia’s overstuffed throat, and she ran a sticky hoof against the steel-cord muscles reflexively working overtime, coaxing the fat shaft within to ultimate glory. “I experimented on myself, as well as others…willingly, and otherwise. My research notes probably look like the ravings of a mad pony, but it was all for naught. None of my other subjects became as…unhinged as you did after controlled exposure to the extract.”

That was the least surprising thing Mary had heard yet, but she couldn’t help pressing a little harder for more info. “Questionable ethics aside, you really just…gave up, after only a half century? That doesn’t quite track with your legendary rep. I gotta admit, I’m a little disappointed. I’ve seen longer clinical trials for dick pills.”

Twilight gave Mary a sideways glance. “If you’re trying to antagonize me, Dr. Parvotti, A) you’re stupid for making the attempt, B) Celestia did it better, and C) it won’t work, anyway. There is no D) all of the above. Would you like to comment further?”

She did, but Mary decided to conserve whatever goodwill she still possessed by staying silent. For the moment.

Twilight gave a disdainful nod as she turned back to Celestia, who had extracted a few precious millimeters of cock from her tortured gullet in a vain attempt to take a clean breath. The legend snarled as if offended by the insubordinate action, and she yanked hard on the Princess’ mane, moving her head up and down like a child playing with a doll.

“I must have made some kind of mistake,” Twilight said as she toyed with her prey. “That was what I told myself. I needed more knowledge…more resources. I had to go to a whole other plane to uncover the truth, once and for all. It took another hundred years, but I did, at last, find answers. They weren’t the ones I was seeking, but science is like that, I guess.”

Mary’d had an inkling that Twilight had spent at least part of her exile on Earth — if you didn’t want to be found, there were few better places than an alternate universe, and it would be simple for an alicorn to stay under the radar in a world without magic, or even internal combustion.

“I get the feeling some very famous scientists found a mysterious collaborator around the 19th century or so,” Mary ventured. Despite the circumstances, she couldn’t help being intrigued. “Not every day you find someone who could call Newton a colleague.”

Twilight half-turned to Mary with an expression of tentative respect. The doctor might have found her scholarly enthusiasm cute — even sexy — if it hadn’t been so tied to tragedy.

“That was rather insightful. The good Sir Isaac was a bit before my time, I’m afraid, but I may have helped Darwin and Pasteur with a few thorny conundrums.” Mary was impressed at how she could reveal such things without a scintilla of self-consciousness. “And I’d love to say that our scholarship bore the fruit that I’d sought…but, no. The secret of Celestia’s insanity eluded me yet. Goodness…a hundred and fifty years wasted. Can you even imagine that, with your human perspective?”

Mary arched an eyebrow. She couldn’t let that fly. “Hey. We may not have much of a long-term view individually, but us apes can do some crazy shit when we put our heads together, you know? Give us some credit; you don’t get Notre Dame without at least a little bit of foresight.”

Mary shakily rose to her feet from the wet beach, suddenly sick of being looked down on. “Ponies haven’t cornered the market on wisdom yet, just like humans don’t have a monopoly on losing control and fucking things up for themselves.” She nodded at something behind Twilight as she brushed sand from her plump ass cheeks. “Case in point.”

Twilight whipped her head around just in time to see Celestia’s balls start to contract, pulling up hard against the shaft in preparation to let loose with an ocean’s worth of salty spew. The Princess’ fat cock thickened, stretching her packed throat even more as the vein inside opened wide. There was a look of delicious terror in Celestia’s eyes, and she struggled in Twilight’s grip, vainly trying to keep herself from tipping over into the abyss.

Twilight’s face was a picture of wrath as she grasped Celestia’s regal horn with both hooves, at the same time spreading herself as wide as possible, almost rubbing her sloppy cunt against the Princess’ treacherous balls as they heaved with strain. “I told you not to come! I commanded you! Are you going to disobey me, Celestia? Are you? Could you truly be so far gone you can’t even follow simple f-freaking directions? Hold it back! Do as I say!”

Celestia shuddered, and she grasped the top of her soft-furred sack tightly with both hooves in a desperate attempt to delay her release, to no avail: the familiar contractions were far too strong, overpowering even the royal grip as the pumping action continued unabated. Celestia’s orgasm was surely inevitable — Mary was intimately familiar with the signs by now, and the Princess had never been one to deny herself pleasure when it was right in front of her. Celestia knew this, Mary knew this…and Twilight likely knew it, too.

That was probably why Mary didn’t panic or succumb to despair as she watched the Princess’ failure. It was the calm of a terminal cancer patient going home to hospice care, enjoying the last few moments of springtime air before the end. If the fate of humanity rested on Celestia not getting her rocks off, then they’d been fucked from the beginning, and it had all been part of the plan. In that case, Mary figured she might as well enjoy the ride all the way to the ground.

“I should send you back to the throne room. Right here, right now.” Twilight’s sloppy pussy drew closer and closer to Celestia’s nuts, until the creamy lips finally kissed the leathery pouch, and the young alicorn began to grind her hips against the round mounds while she grasped the Princess’ horn possessively. It was as if she was working a pole, twerking her tight ass and popping her grape-flavored cunt for a captive audience of one.

“I could do it,” Twilight rasped, her eyes dull and lidded as she danced, indulging in her fancy. “I should. Why not show the whole court what even the youngest Ponyville filly already knows? Let them see you sucking yourself off, drinking your own spending without a care. Imagine the shudders of revulsion from the other Elements…the looks of shocked disappointment. And you’d deserve every…withering…glare.”

Something important was becoming clear to Mary. She decided to take a chance. Wet sand squished between her toes as she took a tentative step toward Twilight, and the sea foam on her olive skin turned her into an insane Venus going for a stroll outside the asylum.

“Kind of a shame you didn’t figure out the whole poison joke thing early on. If you really wanted to fuck everything up for your pretty Princess, weaponizing that stuff in public would’ve been a hell of a play.” Mary put a hand to one breast, pinching the pebble-hard nipple between her fingers as she visualized the scenario. “Would have been amazing to wait for some important audience — maybe that dragon delegation — before cracking open a jar from the shadows and watching the sparks fly.”

Mary recalled one of her many briefings. “What was her name? Ember? I’ve seen her picture. Chick looks like a…tight little package. How long would it take for the Princess to mount that blueberry bitch right there on the royal carpet after catching a whiff of your ganja? Twenty seconds? Ten? Think of Celestia’s face as she starts to realize what’s happening…the horror, the struggle to hold herself back, and then that kinda blank look she gets when she’s too deep in the rut, like a hungry shark sniffing blood in the water. Then would come the screams, the useless fighting to pull her off…and over it all, the plap-plap-plap sound of Celestia getting diplomatic in some prime dragon pussy.”

The doctor heard a warbling groan from deep within Celestia’s barrel, and Mary’s unrestrained laughter carried far over the waves. “Oh, I’m sorry, Princess! Did I just blow up your spot? Is it the teeny little scaly tits, or do you just like ‘em feisty? All the more reason to bounce you out of the castle on your fat ass. What the fuck good is a ruler who doesn’t know how to keep a little goddamn discretion? Lt. Kurosawa had it right. Twilight might’ve saved the kingdom if she just made you go feral where everyone could see it.”

Mary felt the heat in her chest and in her cunt, and she struggled to control her labored breathing. It was so easy to forget why they were there. “‘Course, that probably would’ve started a war or something, but omelettes, eggs…you know.”

Twilight’s hips were a blur of motion against Celestia’s heaving nuts as Mary spoke, but the idea of using her extract to kick off an international incident had her moaning with an even wilder fervor. “Goodness…Dr. Parvotti, how could you be so cruel? I thought you two were partners! But sometimes…mmm…sometimes, cruelty is needed. If I’d only known then what I know now about Celestia’s passions, I would have taken action without hesitation. Better to…oh, oh dear, I’m almost…nnn…better to throw the kingdom into turmoil rather than leave its fate to such a monster!”

And Mary had once thought herself overly impulsive.

Celestia was close. Too close. Her entire body shuddered as she fought to regain the tiniest bit of control over her orgasm, a cause so lost it was whistling Dixie. Far from being outraged at the doctor siding with her former student, the Princess had been carried right up to her limit by Mary’s hypothetical.

But Twilight was teetering at the edge next to her. The young alicorn had said it herself: sometimes, it only took a push to send everything spiraling. One last, good shove would probably do it. That was the hope, at least.

“What did you find out?” Mary’s breathless question was not entirely out of necessity. “Tell me. Tell her. Educate us, Twilight. Hurry!”

Mary’s strident tone seemed to reverberate through the half-sized alicorn like a bell. Twilight began to lose control of her body as she spread her thighs to the maximum, humping her gaping, dripping pussy all over Celestia’s cock-locked face as she painted the Princess’ stretched lips and snout with her foamy cream.

“I…I thought it was me!” Twilight gave a wrenching cry as she tightened her grip on Celestia’s twisted horn. Mary half expected to hear a cracking sound as the ivory gave way beneath the younger alicorn’s hooves, though not even an industrial press could scratch that spire. “I searched my own memories, using magic to go deep into my subconscious. Deeper than any pony has ever dared look at themselves. You would have called it reckless, Celestia…even dangerous…but I could see no other choice. I had to know the truth. For both of us.”

Twilight rested her forehead against her ex-teacher’s while they both barreled toward their endings, and their two horns touched in an intimate way, as if the former student was trying to implant her recollections directly into the Princess’ brain. “I started to see patterns in our interactions, Celestia. Strange words here and there, little touches and caresses that weren’t so innocuous. You remember the games we used to play when I slept over? The funny little ‘lessons’ late at night? Mmm…yes, you do, don’t you? It all became so clear, even though I tried to deny to myself the proof of my own anamnesis. But I’m a scientist. I couldn’t run from the truth forever. And when I finally faced reality…nnn…I’ll never forget the feeling. The sense of betrayal, of innocence defiled. You were grooming me, Celestia, but not just for the throne. Isn’t that right?”

Celestia made a sound like a sick duck as another spurt of precome wet the sands beneath her wide buttocks, and Mary almost came where she stood as she processed Twilight’s accusation. It was a possibility the doctor had kept in the back of her mind since she’d first heard about their relationship, thinking it too obvious — and too fucked up — even for Celestia’s warped mind. But here it was in the clear light of day, and even if the Princess possessed the power of speech, Mary wondered what she could possibly say in her defense. This was more than she expected…and yet, another part of her felt like a fool for expecting anything less.

Twilight released her crushing grip on Celestia’s horn as her hooves wandered across the Princess’ face, touching every disheveled hair on her head as if they were all hers by divine fiat. “That’s okay though, Celestia. It’s all right. I’m much better now. I’ve figured out how to properly slip the reins over my life…and your life, and the lives of everyone you love, if love is even possible for someone like yourself. The desalinization was a delicate plan, requiring a few breakthroughs in magical theory, but I never gave up. I never forgot, and I never forgave. And now…now I’m f-f-fff-frotting myself on your muzzle while your lover watches! Oh, goodness…g-goodness…it’s too much, curse you…come, Celestia! Come! Feed yourself! I command it! Bloat yourself with your own seed, you filthy degenerate! Now! D-do it n-n-now!”

Celestia’s eyes rolled up into her head, showing the whites as she careened past her limit. Her cheeks bulged chipmunk-like as a chunky splurting sound came from deep within her belly, and her massive hips and thighs hunched upward, over and over, battering her chin with her own oversized nuts as they hitched and let go in a regular rhythm, releasing their creamy spend at last.

The Princess’ belly expanded with each flex and spurt of that thick pink hose, accepting wave after wave of delicious baby batter, but those lusty swimmers would be paddling around the wrong pool this day. As Celestia’s midsection rounded and grew to a third-trimester size, the balance of her mighty spending broke the seal of her pink lips against her cock as her load first dripped, then poured from her throat in pulsing surges, freely saturating her chest, stomach, and balls with sticky sweetness.

That was more than enough. Twilight’s whorish moans put the lie to her facade of youthful naïveté as a torrent of cunt cream exploded from her gaping pussy, instantly covering Celestia’s face and body with yet more white, silky juices. She shuddered through her climax like she was wringing every drop of liquid out of herself, and every contraction, every splash of come against her foe’s already soaked-through fur caused an equal response from Celestia’s mighty cock, until the two alicorns’ synchronized orgasms descended into a filthy feedback loop. Their bodily fluids made the sand around them into a slimy swamp, while they gasped and moaned like the mindless beasts they wished they were.

Mary put a hand to her own clasping, furry cunt, reveling in the clenching of her own core as she felt her pussy squirt into her palm — once…twice…godfuckingdammit, three times! — and her thick thighs trembled as she struggled to squeeze multiple fingers into her twitching asshole. But it wasn’t the wild alicorn orgasms that had set her off, nor the devastatingly hot details about the past…not entirely, anyway. Most of all, it was the look of absolute power in Twilight’s sparkling eyes, the dominating posture that demanded perfect obedience, requiring nothing less than willing slavery, complete and unquestioning.

No…it was much, much deeper than that. There was something unique to these ponies, something that made them two hateful peas in an overripe pod, and as Mary rode out her own fierce spending, a kind of orgasmic clarity crystallized her earlier thoughts into a realization that almost sent her over the edge again.

Twilight didn’t really care about the poison joke anymore. After questioning the narrative of her own past, her trauma had gone far beyond a single event, no matter how heinous, so she had come to the conclusion that she needed to take firm control over the shadow that had always loomed over her life. She would not cast light on that shade, obliterating it utterly, for this was not an entity that could be completely destroyed — even if Celestia fell dead right this second, her chilling spirit would remain, dimming the rest of Twilight’s existence with an umbral glow that would never be fully lifted. Instead, the young alicorn would become an even darker shadow, absorbing every stray speck of light as she sought to dominate the creature that made her, that broke her.

And Celestia, in her blind search for forgiveness, would follow her former student all the way to the gates of hell, and beyond. She would do it happily, debasing herself freely, allowing herself to be bound and tamed as if it were the most natural thing in the world…because for the two of them, it was.

Mary had witnessed — and been involved with — more than a few D/s setups in her time. Mostly, it was a game to be played in the bedroom, a naughty bit of fun whose influence evaporated like sweat in the morning light. For a few, it was a “lifestyle,” allowing a constant level of sexual tension, yet carefully controlled and regimented so as not to be too disruptive to everyday existence. There were rules and code words — safe, sane and consensual, as the phrasing went. It was a life of compromise, as dangerous as a roller coaster, with cheap thrills substituting for true pathos.

This was not that. Celestia and Twilight did not cling together because they wanted to. They had been storm-tossed by misadventure before washing upon the shores of the lotus-eaters, only to set sail once again in an obsessive hunt for their white whales, which had become each other. They did not wish for safety; if Twilight ever decided to kill Celestia in a fit of mercy, the Princess would gladly offer her neck. They did not want sanity; they had both lost that light long ago, becoming shells of themselves, hiding their warped personalities under a façade of alicorn pride. And as for consent…well.

The two ruined ponies fed off each other in a parasitic spiral, one taking everything, and the other giving all. This was no longer a relationship as the doctor understood it.

It was a food chain with a Möbius twist, and Mary's cunt bathed itself in glory as the star-crossed beings consumed each other, leaving nothing except flesh.

Chapter 2

Celestia lay gazing with unblinking eyes at the wide blue sky, streaked with wispy clouds from horizon to horizon. Mary still quivered from a few feet away as she rode out her aftershocks, struggling to even stay upright, but she forced herself to observe the Princess closely, trying to guess what was going through that labyrinthine mind in the wake of such a messy orgasm.

The doctor wondered if there was any comparison in Celestia’s long life to what they were going through right now. A thousand years meant a lot of weird moments, yet there was — thankfully — only one Twilight, and only one Sun Princess. The universe was capricious and unpredictable, and Mary liked to believe that that was what was so cool about it, making life worth living. There was always some crazy new shit to experience, even if you lived a thousand, a million, a billion lifetimes.

Celestia spied a seagull, wheeling over the waves in its search for a meal, and she tracked its flight as it passed across the disc of the noonday sun, directly staring into the blazing light without so much as squinting. The gull banked and swept low, diving to the sea in a flash before rising again with a silvery, flapping morsel in its beak.

The successful hunter alighted on a salt-infused sculpture, one of many spread across the white sands, and its talons crunched holes in the delicate butterfly wings that made up this particular crystalline formation. The thin membranes were so detailed that Mary thought they might flutter away at any moment, across the roaring waves toward an unknown land.

The gull flapped its own enormous span once, twice, and then settled into swallowing its dinner, heedless of the damage to Twilight’s masterpiece under its webbed claws. But the magical icon took care of itself, regenerating with a swirl of glittering sodium drawn from the deepest depths of the Atlantic. Mary watched this happen along with Celestia, and the doctor understood instantly that nothing less than alicorn might could stop the glyphs’ deadly processes.

And possibly, not even that. But it was no use considering the worst case scenario.

Celestia’s head rested upon Twilight’s lap, and her mane of riotous color soaked up the rich cunt juices pooling underneath them like a used mop. Twilight let out a soft grunt, and a thick pulse of cream bubbled from her blown-out gash, splashing upon the Princess’ unresisting face and dripping off her cheek, adding to the inch-high lake of juices mingling with the sea water below the tired creatures.

A meaty schlick…schlick…schlick sound could be heard over the roar of the surf, slow and steady. Twilight’s hoof caressed what she could reach of Celestia’s three feet of majestic cock, slathered in the two ponies’ pearly ejaculate and already stiffening from the new stimulation. She stared with curious intensity at the mighty organ and its oversized balls, audibly sloshing with new vigor, but it was not a look of wonder, or envy, or disgust. It was the look of someone playing with a new toy, giving it a thorough once-over to ensure everything was in working order. She had claimed that mighty prick for her own, and now she enjoyed the fruits of her conquest, with little regard to its former owner.

Celestia’s quarter-sized pisshole yawned wide, and her nuts heaved as gobbets of come from the bottom of her ballsack pumped out of the opening, thick as clotted cream, pouring in sluggish rivers down the mottled length and covering Twilight’s stroking hoof with leftover mess. Instead of reacting with anger at this befouling of her person, however, the young alicorn brought the digit to her mouth, thoroughly licking it clean with a small, pink tongue before returning it to Celestia’s fleshy fountain, allowing it to be coated with yet another layer of warm spooge.

Far from her earlier revulsion, Twilight now seemed to enjoy the feel of Celestia’s sticky come on her fur, and the taste on her lips…and why shouldn’t she? It was hers, after all. Every drop that would ever percolate through those inexhaustible royal jewels belonged to the young alicorn as of this moment, to be savored or discarded at her whim. And there was no reason to waste such a delectable offering…not when it had been freely given by such a fervent penitent.

As proof of her submission, Celestia turned her head to the side and unrolled her slimy tongue, laving it around the edges of Twilight’s ruined pussy before going in deeper, slurping up as much cunt juice from those reddened depths as she could draw into her throat. Twilight hissed, grasping the pure white horn in her lap as she used the Princess like a sex toy, humping herself into that graceful muzzle and pressing it so deep into her slimy gash that Celesta began to sputter and choke. But the older alicorn did not pull away, meekly allowing herself to be used and moaning in contentment at the rough treatment.

Did Twilight even care that Celestia was enjoying the feel of the hoof stamping upon her face? What if she began to? How far would the young legend have to go before punishment led to real anguish, instead of masochistic pleasure? The potential answers to those questions made Mary shudder. Now that some of that excruciating sexual tension built up over centuries had been expended, the post-nut clarity from such a release was the biggest threat to the doctor’s continued existence yet. Mary had to keep Twilight off balance and soaking in sin so she could buy enough time to think of an actual solution to this shitshow.

“If we can’t kill you, maybe we can just wait for you to die of dehydration,” Mary said, planting her hands on her hips as she tried to project more confidence than she felt. “Are your cunt and her balls connected to a magical come dimension, or something? I can have some Dasani brought in, if you need it.”

Twilight lazily turned toward Mary, dragging Celestia’s head to her fat, pulsing clit and spreading her thighs wide, shamelessly enjoying her slave’s devotion as she regarded the doctor. “Mmm…goodness…goodness. That was s-something, wasn’t it? It’s so fascinating, the way eroticism is tied to circumstance. I’ve had other ponies eat my c-cunny before, but the sight of Celestia’s face buried in my pooch simply drives me insane.”

Celestia made a burbling sound against the young alicorn’s slick cunt flaps. It sounded like happiness to Mary, but she wasn’t quite sure. Twilight playfully rubbed the Princess’ come-covered nose anyway, and Celestia quieted down, settling into the natural worship of her new fizzy grape-flavored goddess.

“I would imagine, at times, the sense of satisfaction I’d have when I finally shackled you,” Twilight sighed, “but this is exceeding my wildest f-fantasies.”

Mary gave Twilight a searching look. “Is that cute little stutter for real, or just your attempt at manipulation? ‘Cause I kinda feel like I’m being underestimated here. Might be bold coming from me, but I don’t particularly enjoy getting fucked around.”

The corners of Twilight’s lips twitched into an approving smile, but the humor in her lidded eyes was that of a witch, and she ceased her petting of Celestia’s busy snout. She slowly rose from the soiled beach, letting the Princess’ head fall from her lap to the filthy swamp with a splash. Celestia scarcely reacted to being so carelessly tossed aside, only rolling onto her stomach and rooting in the muck like a naked mole rat, existing only for whatever stimuli she could find. She was soon encrusted in alicorn scum as her hips rose and fell, screwing a hole in the sand in an instinctual search for pure sensation.

Twilight never gave a single glance backward as she approached Mary, leaving her slave to her own bestial pleasures as the crunching of her hooves sounded loudly in Mary’s ears. The word adorable kept flashing in the doctor’s mind as the purple pony, with her pint-sized horn and stubby legs, came closer. Was that by design? Mary gave herself a mental smack in the face as she glanced at the salty glyphs floating nearby, remembering that this was not a cute woodland creature who would be her friend forever, if they could only talk through their differences like rational individuals. Twilight was an alien in every sense of the word, though one with the advantage of hundreds of years of human observation. And she was at least as brilliant, as devious, and as broken as the Sun Princess.

“Who’s been underestimating who?” Twilight said, and she chuckled at Mary’s wide-eyed shock, as if the alicorn had been reading the doctor’s thoughts. “Not me, certainly. Anyone who can match Celestia’s hunger, and has earned her respect and confidence, is one to be wary of. I haven’t reached my current strength by taking my enemies lightly. And make no mistake, Dr. Parvotti. I do consider you an enemy.”

Mary stood still, only turning her head as Twilight rubbed against her body like a panther, even arching her back as she circled the human, teasing the tanned skin with a gentle touch of a wingtip here, and a bump of a flank there, and a sensual caress of a striped tail wherever she could reach. The heady musk of Twilight’s perpetually randy cunt filled Mary’s nostrils, and the doctor began to pant as she radiated with fresh heat. She had to force herself not to reach out to stroke the soft, shining fur that surrounded her with carnal promise, and she gave a low growl at the knowing quirk in Twilight’s lips as she fought to keep control over her own lust.

“You make her want it,” Twilight purred as her nose nuzzled between Mary’s thick ass cheeks, blowing a cool breath of air against the winking hole within and making Mary bite off an involuntary groan. “You make her embrace the leviathan. You could have been a mediating force for Celestia’s mad passions, leavening her desires into something less…destructive. Instead, you encourage any perverted thought that enters her screwed-up head, pushing her into ever more extremes of debauchery. The next time Celestia makes a ruin out of someone’s unsuspecting womb, I hope you feel at least somewhat responsible.” She chuckled, giving the twitching brown asshole a long, slow lick, which sent a bolt of lightning up Mary’s spine. “But you probably won’t, will you?”

“I can’t make the Princess of the Sun Upon the Golden Throne of Canterlot do a goddamn thing,” Mary said through gritted teeth as she endured Twilight’s goading. “That’s all on her. I’m just along for the ride, enjoying the view. Celestia’s sins, whatever they might be, are not my fucking fault.” She reached behind herself and pried her cheeks open, exposing her dark hole and hairy, dripping cunt to the humid ocean air. “That said, I’ll confess to the fuckin’ Zodiac Murders if you keep doing what you’re doing. The way you use that tongue says you’re not as inexperienced as you come across, and I’m not talking about your rancid attitude.”

Twilight’s hooves replaced human hands on that big, soft rump as she accepted the doctor’s offer. The young alicorn started from the front as she went between Mary’s legs, dragging her mischievous pink taster across Mary’s gushing cunt, running it around the straining, throbbing clit and drawing lazy circles, producing a stifled groan before moving backwards and laving the sensitive taint between Mary’s pussy and her rear entrance, getting closer and closer to…then, she stopped.

Twilight pulled back for a moment, admiring her handiwork as long ropes of spittle connected her lips and Mary’s inflamed privates. She seemed to be enjoying the human’s desperate attempts to keep from coming…and honestly, Mary was, too, but she’d be damned if she was going to give that uppity mare the satisfaction.

Twilight’s dark chuckle told Mary she wasn’t fooling anyone. She pulled the doctor’s meaty buttocks further apart, revealing the puffy orifice that was already quivering, opening and closing with every beat of Mary’s racing heart as it awaited its turn, so needy in its desire to be filled by something, anything. “It must be nice to have such…selective morality,” Twilight murmured as she slid the tip of one hoof into Mary’s twitching rear entrance, going just deep enough to make Mary grunt as she pushed her big ass backward for more. “It’s so easy to tell yourself you’re just a weak little human, caught up in the historic events of first contact. After all, Celestia is a creature from another dimension, strange and unfathomable. It isn’t as if she has her own thoughts, desires, fears and hangups, just like any other living being. Why bother trying to use your own judgment when you can just tag along with her schemes like a trained animal, even as you sink your own teeth and claws deeper into her neck every day?”

A loud moan came from Celestia’s direction, and Mary and Twilight both turned to see her massive, sun-spanned buttocks clapping against the sand, faster and faster until she abruptly stopped, and her whole huge body trembled in release. The sounds of spurting were clear and strong as the Princess gave a blissful whimper, emptying her balls deep into the ground.

Twilight chortled with unrestrained glee. “Behold, the otherworldly menace! Hide your glory holes, people of Earth!”

Mary wasn’t hearing anything she didn’t already know. She had few illusions about her strange relationship with Celestia, but she’d become so used to the narratives she’d prepared that the lies came easily to her lips.

She tried not to think too deeply about her own issues, concentrating on the problem currently rooting around in her anus, but the sight of the Princess wallowing in her own special blend of ecstasy and despair only served to fan her flames higher. That, as well as the delightful feeling of Twilight’s fur-covered digit in her hungry butthole, sent her careening down that slope toward oblivion, and Mary could no longer even pretend to keep her cool.

“You think you’re any better than her?” Mary gasped, holding onto herself as best she could as Twilight’s wriggling tongue did the hoof one better in pleasuring her winking asshole. The tiny muscle seemed to be everywhere at once, tracing random nerve bundles outside and in, keeping the doctor on edge constantly as her body tried and failed to anticipate where the sensations would come from next. “You’re…trailing your slimy cooze all over the beach, you…dumb fucking candy-coated mule. God…she really wrecked that pussy all the way through, didn’t she? Made you into a freak, just like her.” Mary gave a low chuckle that turned into a sharp laughing cry as Twilight dug deeper into her booty. “Ahah!…nnn…but you can’t cook a meal without the ingredients. I’m thinking she just woke up something inside you, something you were born with. I’m sure it sucks to find out you were always a dirty little size queen, but you gotta face the truth sometime. Personally, I think Celestia did you a solid.”

“You do like poking bears, don’t you, Dr. Parvotti?” Twilight sounded annoyingly unfazed. “One of these days, you’re going to overstep your bounds and get eaten alive.” The young alicorn opened her jaw so wide it creaked with strain, and she covered Mary’s asshole with her muzzle before shoving her tongue as deep into the spasming channel as she could reach, greedily sampling the musty flavors of that well-used anus. She hummed from deep within her barrel, and the doctor fought the wild urge to jerk her hips, covering her drooling pussy with one hand in a fruitless attempt to hold back the tide and receiving a splash of cunt juice in her palm for her trouble. Twilight’s throaty vibrations traveled through her body into Mary’s core as that questing wet muscle worked its way into the human’s furthest reaches.

“Sometimes…slurp…when I’m alone with my darkest, most terrible thoughts…mmm…I fear letting Celestia ravage me might have been for the best. We’re all products of our experiences after all…mph, oh my, you are delectable. Her assault shook the rust off me, making me what I am today.”

That certainly was one way to deal. “You’re rationalizing, Grape-Nuts, and you know it. Hell yeah, get all the way in there. Eat the booty like a steak. Show me what I’ve been missing.”

“I can’t deny your diagnosis,” Twilight said with surprising charity as she practiced a few new tricks. “Trauma is a weird thing. I may not be able to see my own blind spots…mmm, yes, you liked that move…but I can see the shapes they leave in my mind. Still…nnn…if I hadn’t endured what I’d gone through that day, I wouldn’t have had the distinct pleasure of seeing the look on that creature’s face as I took everything from her. It’s a feeling I didn’t know I was missing…and now…slurp…now, I can’t live without it.”

Twilight had a faraway look, and her tone became unusually pensive as she plunged her hoof into Mary’s well lubricated ass without preamble, burying it up to the wrist and making the doctor scream with delicious agony. “I’m sick now, Dr. Parvotti. Maybe I always was, but after Celestia, I definitely am. Don’t you ever tell me my retribution isn’t justified. I could do so much worse, instead of just taking dominion over her and everything she owns, but she needs to at least live with the consequences of her actions.” She gave a small laugh as she turned her hoof clockwise, then counterclockwise in Mary’s rectum while moving in and out, enjoying the crushing pressure against her digit as the doctor took her medicine without the assistance of body shaping magic. “Claiming you is one of those consequences, I’m afraid, but I think you’ll find me to be a reasonable mistress. Mostly.”

Twilight’s thrusting went deeper, and yet deeper, making a naughty squishing sound in Mary’s asshole, and the doctor grunted with complete abandon as she spread herself, not even trying to hide her noises of delight as she was hoofed raw. Mary could feel the contractions starting up in her core, and she was sure Twilight could sense the same, but her pride wouldn’t let her go out without a fight. “Thought I told you before,” Mary hissed as Twilight’s other hoof went to her overheated cunt, teasing around the outside and smearing hot cream around her throbbing clit, “I’m not your fucking action figure. You’re gonna have to make do with one less hopelessly devoted slave, ‘cause I ain’t the one, hon.”

Twilight abruptly yanked her arm out of Mary’s colon with a sucking pop. The doctor’s asshole gaped wide enough to admit a Golden Delicious, and the angry red interior pulsed and clenched, desperately seeking out a big, thick whatever to fill it again, but the young alicorn took a step backward and sat on her haunches, patiently waiting for Mary’s attention like a schoolteacher dealing with a rowdy student.

Mary took a moment to recover with her eyes closed, bent over with her hands on her spread knees, and she took a series of deep, shuddering breaths, tamping down her approaching orgasm before rounding on Twilight with an annoyed glower. “Goddamn it! The hell, now you’re mad I won’t play ball on your terms? What happened to ‘using my own judgment’? If you want a fuckbuddy, just say so, but I get the feeling the two of us have some misaligned expectations about what that means.”

Twilight didn’t actually look mad…just annoyed and somewhat put out, as if Mary was being painfully obtuse. “Stand on one foot,” she said quietly.

Mary guffawed as if she’d heard a bad joke, but the laughter died on her lips as Twilight locked eyes with her. “What is this? Are you fucking with me, or…”

Twilight said nothing as she stared the doctor down. She did not explain herself, and she did not repeat her instruction. She merely waited with the graceful conviction of a sovereign, knowing that her order would be obeyed without question. It was a certainty that Mary suspected had been tested and reinforced time and again. Had Twilight been told ‘no’ even once in the past few decades? The doctor doubted as much.

Mary considered the consequences of insubordination. They had agreed to follow the legend’s directions, but silly shit like this was not what she had envisioned. If the doctor followed her instincts and told Twilight to eat a dick, would the young alicorn take it personally?

The stony look on Twilight’s face told Mary that yes, she would take being told to eat a dick very personally indeed. They couldn’t afford the risk, and they both knew it.

Mary sighed in acquiescence, though her expression made her objection clear, for whatever that was worth. She raised her right knee as she crossed her arms in childish defiance, relying on her equestrian-trained balance to keep herself upright. “You happy?”

Twilight’s countenance did not change in the slightest. “Moo like a cow.”

Mary’s sole started toward the ground again as she let out an exasperated snarl. “Look, bitch-“

“I did not grant you permission to lower your foot.”

The doctor’s heel leapt up as if the sand was made of lava, and she wobbled as she spread her arms, swearing at her own reflexive obedience. Mary definitely wasn’t having fun anymore. “Moo,” she said sullenly.

Twilight raised her eyebrow a millimeter, and Mary’s anger deepened. “What’s the point of this? What do you want me to do?” She instantly felt foolish for asking the question, as Twilight’s objective was painfully obvious, but she couldn’t help being pissed at the young alicorn who sat at perfect ease, awaiting the fulfillment of her command.

Mary's huff was teenager-worthy as she stood there on one leg like an idiot, but there was nothing for it. “MooOOO!” The sound was right out of her memories of the family farm, loud and lowing.

Twilight nodded, satisfied. Mary half expected patronizing applause. “Very good. Be at ease.”

Being at ease was the farthest thing from Mary’s mind, but she obeyed, stamping her foot on the ground with more force than she intended. Twilight rose to her hooves, and she got right up in the human’s sour face, drinking in her indignation like a fine Malbec. “You most certainly are my action figure, Dr. Parvotti. I can pose you like a doll, or dress you up in cute outfits if I so desire. I can also pull you apart at the joints. Do you understand what I’m saying?”

A forceful ocean spray splashed against Mary’s legs, strangely chilly despite the noonday heat, and she felt goosebumps rise on her olive skin. The doctor swallowed hard, her throat suddenly seized by an unusual force, but it wasn’t the power of magic that kept her silent. It was something much more primal, more dangerous, reaching into her spinal column and running clammy fingers along the edges. Twilight’s clear and present threat was reflected in her eyes, dark as a shark’s, and Mary had no counter.

Twilight gave a barely there smile, reading Mary’s reactions as they flowed across her body. “Good. That will save us a lot of aggravation. Now, then. I think it’s time to claim my prize.” She ran a hoof under Mary’s left breast, feeling the heft of it before brushing the digit across the front, and the nipple turned stone-hard immediately, despite the doctor’s unease.

Twilight chuckled at the response. “Someone has a one-track mind. I’m starting to understand Celestia’s attraction.” Her hoof went lower, tracing the curve of Mary’s hip before squeezing one of those chunky buttocks. “That’s fine, though. It’ll make breaking you all the more satisfying.”

Mary wet her lips, feeling the constriction on her vocal cords lessening. She seethed at how her cowardice had been put on full display, silently vowing to pay back the humiliation. With interest. “If…if Celestia couldn’t break me,” Mary said with increasing confidence, “I think you’re gonna be disappointed. You’re welcome to try, though.” She brazenly grasped Twilight’s wandering hoof and moved it to her inflamed twat, already moistening with fresh cream. “Us humans have tricks of our own. If you don’t watch yourself, you might just end up begging me to let you come. Fair warning.”

Twilight glanced at Mary’s hand on her furred digit with a skeptical look before returning her gaze. “Your misplaced self-assurance is noted. I still don’t think you quite understand what you’ve gotten yourself into, but you’re going to learn. Right now.”

Mary barely saw the blur of motion from Twilight’s other front hoof before she found her legs tripped out from underneath her, and she fell hard to the wet sand, landing on her rear with a surprised grunt. The doctor herself had a first kyū judo brown belt, so she recognized a takedown when one was done to her, but the speed and power of Twilight’s attack was still shocking.

A slick of fear bubbled to the surface of Mary’s awareness, but she let her anger roil it away, instead forcing herself to meet Twilight’s action with sultry defiance. “Nice move. Did Celestia teach you that, or did you squeeze in some MMA training while you were away? Wanna practice some mount positions?”

Twilight glared down at the fallen human. “I must admit, I never expected anyone to be so…enthusiastic about being taken against their will. You do realize what this is, don’t you?”

Mary shrugged. “If rape is inevitable, might as well lay back and enjoy it. Then again, the struggle adds a little spice, right? But I’m sure you know all about that.”

“More than many.” Twilight began to circle the human, examining her like a prized steer fresh from auction. Mary couldn’t read her expression well enough to figure out if she dug what she saw. “I’m sure you’re familiar with the literature on abuse, Dr. Parvotti. It’s a cycle. The sins of the parent — or the mentor — are passed down to the next generation, and it starts all over again. I’m no different, and I’m afraid you’re next in line. I wouldn’t worry too much, though.” Her eyes flicked to the forest of sigils along the coast. “The cycle ends with me, one way or another. I promise you that.”

Mary knew a lie when she heard it, and this one was screaming from the rooftops. Celestia had had more than a millennium to come to grips with her monstrous libido, and she still failed in the end. If Twilight thought she would do any better as a newly-ascended alicorn with ultimate power, sparing both ponykind and humanity her madness by some miracle, she was either deluded, or crazy, or both. This would only be the beginning.

Quite simply, things would probably get very bad if Twilight had her way, and they were running out of time.

Mary looked past the young alicorn at Celestia, sitting on the ground a few yards behind. Her thick thighs were spread, and she was stroking her massive pink cock using both hooves while staring at Twilight’s messy cunt with a glassy expression, as if the smell of her ex-student’s juices was a drug all its own. Her hips slowly hunched up and down, and the occasional spurts of precome fired into the air and fell on her snowy head like salty rain.

Correction. Mary was running out of time. Celestia’s had already run out. Hard mode it was, then.

Twilight stopped directly in front of Mary’s supine form. “Open your legs. Show me what I have to work with.”

Now, this was more like it. Mary spread her legs wide, but she also raised her hips, demonstrating her natural flexibility as she brought her ankles to her ears, leaving her knees bent akimbo. Her cunt naturally unfurled like a wet flower, and a drizzle of thick cream pulsed from deep inside and trickled down the crack of her ass, leaving a slimy trail that dripped into her clenching brown hole before overflowing onto the sands below.

Mary worked her Kegels, making her twat pulse and throb while more rivulets of mouth-watering juices bubbled from her depths. It wasn’t exactly equine winking, not really, but she figured she got her point across well enough.

The doctor thrilled to Twilight’s eyes on her sloppy gash, and she rolled her hips in a slow fucking motion, leaving nothing to the imagination. “How often do you get a taste of human pussy? I get the feeling it’s been a while. Well…no need to stand on ceremony. It’s yours, isn’t it? Take what you want.”

Twilight took a step closer. Her little button nose twitched as she breathed in Mary’s musk, and she made a strange, small sound. There was a loud splat as a waterfall of cream spilled from her cunny, making a puddle between her rear hooves. “Your…vagina is exquisite, Dr. Parvotti. I’ve never seen such a hungry looking orifice without looking in a mirror.”

Mary rolled her eyes. “Pussy. Poo-say. Come on, just once. You won’t burst into flames, I’m pretty sure.”

“You can’t guarantee that.”

“No. No, I guess I can’t,” Mary conceded. “Look, if you’re ready to sling cock, then step right up. But, uh…seems to me like you’re missing some crucial equipment. Gonna need to magic up Big Jenny and the Twins before we can start rocking and rolling. And you better make it good, ‘cause the stuff I’m used to is fucking fire.”

“I don’t need a penis to make you see stars,” Twilight said as she licked a drop of her own soda-flavored juice off a hoof with her devilish tongue, “but there’s a certain brutal symbolism in doing it this way that I rather like.” She turned to Celestia as she clopped her hooves together twice quickly. “You. Beast. I know you’ve been listening. Make yourself useful for once. Natural size is fine — I don’t want to completely destroy her. Not yet.”

Celestia stared blearily back at her mistress as she fondled her royal meat slab, now sticky with drying come and wet sand yet still thick and diamond hard, while her balls rumbled as if she’d been edging for days. At first, Mary thought she hadn’t processed the order, and for a terrifying moment the doctor wondered if she was finally so far gone she’d lost her powers of reason altogether. Then the Princess gave a timid nod, and her majestic horn began to glow with a soft, white light.

Twilight grunted, wincing at the extreme sensation of magical manipulation, and she spread her rear legs wider to relieve the sudden pressure in her crotch. Her sensitive clit, already the size of a cherry tomato, began to throb with mystic energy, growing bigger and bigger with each pulse until it was the size and shape of a horsecock the width of a soda can, over a foot long and colored a bright mottled violet, with black spots. It was crowned with a flare that could cover Mary’s palm, already drooling fat globs of precome from the tip, and the doctor could see an indigo sack with nuts like softballs between Twilight’s thighs. No sign of the young alicorn’s dripping cunny could be found.

Twilight’s eyes were squeezed shut tightly, and she groaned as the unfamiliar feelings swept through her. “Oh. Wow. Wow. So this is what it’s like. I didn’t think it would be so…nnn…intense.” She opened her eyes again, and she admired her new piece as she ran her hooves along the soft surface, letting out a shuddering sigh as her balls lurched, spewing a line of white onto the sand between Mary’s raised thighs. “Ohhhh, g-goodness!”

Twilight had never given herself a prick before. The realization sent a spasm of pleasure into Mary’s cunt, and she couldn’t keep a goofball grin off her face. She’d been racking her brains trying to figure out what kind of leverage she could use against the legend, but she never considered that Twilight might be new to the thrusting, penetrating power of cock. It was a slight advantage, but if this was still a negotiation, she had to hold onto whatever edge she could.

Although…the doctor couldn’t help looking askance at Twilight’s new tackle. “Mmm. That’s not bad, I guess, but I have to admit you’re kinda letting me down.” She used a hand to mark a line high up between B-cup tits shining with perspiration and bodily fluids. “I’m used to a little more meat on that bone, if you catch my meaning. Gotta be this tall to ride, Clyde.”

“Thanks for the reminder to have you fitted for a bit and bridle. In any case, I’ve got enough to feed the needy, I assure you.” Twilight got into a bow-legged crouch over Mary’s frothy cunt as she lined up the head of her new cock. At first touch, the tempting hole twitched and anointed the young alicorn’s broad tip with a libation of juice that tickled Mary’s channel as it streamed out in a rush. “I wasn’t going to b-bother with lube anyway,” Twilight said as she showed her teeth. “Nnn…so soft. P-prepare yourself, Dr. Parvotti. This isn’t going to go the way you expect, and I want to see your f-face when comprehension sets in.”

There was that queer verbal tic again, although Mary wasn’t sure if it was an affectation this time around. Twilight’s glassy eyes and slack mouth were frighteningly similar to Celestia’s when the Princess was running on pure instinct, and the doctor tried to figure out if that was a good or bad thing as the stress on her lower lips steadily increased. “Yeah, I don’t think you get it. I’ll have to have Luna send you a copy of our first night. I thought I was gonna AAAHHH! Shit, wait wait wait wait wait, what the fuck!?”

Twilight put her hooves on Mary’s raised ankles, holding the struggling human steady as her flat tip popped into the doctor’s constricting gash. The legend groaned loudly, deeply, raising her voice to the sky as she forced another inch into that clinging hole. “NNNNHH! I told you, d-didn’t I? Body shaping magic isn’t really my area of expertise. Ohhh, goodness….goodness, I can’t…too wet! Too hot! I won’t stop, Doctor! I refuse! No, don’t run from it…you don’t have to like it, just t-take it all! Nnngh, so…so good!”

Mary reached down with both hands, grasping Twilight’s thick shaft in a desperate attempt to slow its advance, but the sizzling length slipped through her palms as it sank further into her protesting cunt. There was some pain, yes, but it was mostly an unfamiliar sense of fullness, a weird pressure that she had never experienced in her trysts with Celestia. The doctor watched with wide, teary eyes as a lump under her skin slowly traveled up her stomach, and each tiny movement Twilight made as she settled into her assault made Mary want to scream.

Sometimes, the absence of something was just as conspicuous as its presence. For the first time, Mary truly understood what Celesta’s magic had done to her. Most porn stars couldn’t take a foot of fat horsecock without hazard pay, and though the doctor had been fairly experienced before meeting the Princess, a prick like this would have had her questioning her life choices.

Unfortunately, she no longer had a choice in the matter. The throbbing meat bludgeoned Mary’s insides as it tunneled deeper, resisting all her body’s efforts to reject the invader. Twilight’s “average” cock made the doctor into a sputtering mess as it gouged her out, just as the young alicorn predicted.

Twilight yelped as her prick was crushed by Mary’s clenching orgasm, feeling the contractions travel up and down the third of her length already embedded into the sticky hole. A spray of girlcome doused her torso as the doctor shook uncontrollably, and she let out a lusty, chuckling moan at Mary’s bodily submission.

“Don’t worry, Dr. Parvotti,” Twilight breathed as Mary’s core clenched again and again on her raging spire. “You’ll like being a size queen. I’m going to turn your tight little c-cunny into a ruined hole just like mine, so that every time you lay with a lesser being, you’ll mourn in a secret voice only I can hear.” The alicorn moaned as she pulled back, then in again, flexing her pert butt as she started to fuck herself into a frenzy. “Take it all, there’s a good pony. Show me your tears. Let me hear you wail my name as you come all over me. Nnnghhh…more…I need more! Say it! Empress Twilight! Say my name, damn you!”

Mary couldn’t have spoken more than a gurgle at that moment, to say nothing of bestowing titles. She gurgled anyway at the hammering in her tightness as Twilight laid into her hard and fast, claiming her cunt like a conqueror, and the doctor became more and more alarmed even as a series of rolling contractions rattled her overwhelmed mind.

The young legend was not going to stop until she crammed every glistening, purple inch of cockmeat into the belly underneath her, and that was going to be a highly difficult proposition at best with Mary’s all too human anatomy. Cervical penetration as a concept had always sent the doctor soaring, but if she didn’t end this soon, the reality of Twilight’s uncontrolled passion without the protection of Celestia’s shaping magic was going to bring her plummeting back to earth. Hard.

Mary struggled to hold onto her rationality as she groped for a way to escape, while Twilight drew closer and closer to her unprotected womb with each manic thrust. The only way out was forward, as far as she could tell — if she could make the alicorn come, that would probably be enough of a shock to the system to keep Twilight from destroying her. A gambit began to form in her overstimulated brain…risky, but she had to try.

“What would Cadance say…if she could see you now?” Mary grunted, forcing out the words as Twilight wrecked her insides. “I think she’d be…jealous. Did you ever have…sleepovers? Just you and your foal sitter…alone in your room, with your parents…right down the hall? Hm? I bet it was always…her idea, wasn’t it?”

Twilight’s rampage almost stopped entirely as a light of shocked recognition lit her face. “How…how did you k-know that?”

Evidently, they didn’t teach cold reading in Princess school. The doctor plunged forward while the element of surprise was in her favor.

“Cady?” Mary whimpered in a small voice, making herself sound as meek and vulnerable as possible while staring up at Twilight with big, watery eyes. “What are you doing, Cady? I told you I don’t like this, it feels icky. You’re…you’re gonna break me, Cady. Where’s Mommy and Daddy? Mommy! Daddy! Help mMMMMPH!”

Twilight’s hoof muffled Mary’s cries as the alicorn re-doubled her efforts, slamming into the human with a sudden bone-rattling force. “Shhh…you gotta…you gotta stay quiet, Twi. You don’t wanna wake up your parents. It’s late, and they’ll get mad. I…I’ll get you some ice cream tomorrow, like I did last time, ‘kay? Please let me do this…super duper promise this’ll be it, Twi, I swear…yeah, good pony. Settle down and take it, that’s it. It’ll feel good soon, I know it will, just…think of the ice cream, Twi. Nnnnfff…I love you so fucking much, you know that, don’t you? Why did your little body have to be so sweet? Oh, Twi…”

Mary was glad “Twi” couldn’t see her wicked smile. This was a weird kind of inverted role-play that the alicorn had slipped into, but the doctor was positive that every word and mannerism was perfectly captured from memory. Cadance had certainly left her mark on that receptive mind.

The poor filly never stood a chance. First, her foal sitter, then her mentor…just a nightmare of trust issues. Mary didn’t know if it was an alicorn thing, or if Twilight simply gave off “molest me” vibes, but the cycle had started long before Celestia, and it wouldn’t end with her, either. There was a time when Mary would have bemoaned the cruelties of fate, but she knew better now. It wasn’t fate that led Twilight to this point…simply desperate lust, fumbling in the darkness of a young pony’s bedroom.

But…hadn’t Celestia torn Twilight’s virginity from her on that sweet-scented day? What could this mean?

Before she could fully ponder the question, Twilight removed her hoof from Mary’s face. The human took a single shuddering breath, and then her lips were consumed by a purple alicorn muzzle as it forced them open, filling her mouth with a searching alien tongue while swapping hot spittle that dripped down her reddened cheeks.

Twilight pulled back, at the same time biting Mary’s plump lower lip in a way that was anything but playful, and a string of saliva connected the two as the young alicorn gazed at the doctor with a look of fresh esteem. She lowered her equine snout to Mary’s ear, speaking in a whisper thick with exertion.

“That was very good. You caught me off guard, Dr. Parvotti, and that hasn’t happened in a long time. What’s your next play? Or was that it? If so…” Twilight used a hoof to adjust Mary’s pelvis to the proper angle before digging her rear legs into the sand and bearing down sharply, causing Mary to yelp in confused pain and pleasure as that mottled prick slammed into her deepest self. “Knock, knock.”

Twilight gave another quick jab of her hips, and Mary’s eyes squeezed shut as she barked a broken moan. The doctor could feel the moisture in the corners of her eyes, and that galled her, but there was a new fire in her belly that fueled her resolve: those tears would be her only concession. She didn’t give a shit if Twilight turned her ovaries into scrambled eggs — now that she knew that the legend had her own particular vulnerabilities, there was hope. Even now, with Twilight at her most forbidden gate, she knew she still had an out.

Mary opened her watery eyes as she peered past Twilight’s panting face against her neck…at Celestia, who was rearing up like a stallion behind them both. Her massive frame cast a chilling shadow against the sun, with her fat, thick-as-a-thigh Princess cock pointing to the heavens in a blind search for penetration.

The distraction had been a success, and Celestia was through with being left out of all the fun. A jet of precome spurted from her flat tip, landing with a splat upon Mary and Twilight’s straining bodies, although the unsuspecting legend ignored the deluge, too far gone in her own scramble for release. For Mary, however, that mighty tower of flesh represented salvation.

The doctor still had two holes free. If Celestia sank her prick into one of them, the Princess’ instinctive magic would change Mary’s body, protecting her from Twilight’s ransacking of her womb. However, the young alicorn also had convenient orifices. In Celestia’s addled state, there was no telling what she would do.

And to Mary’s great shock, she realized that this uncertainty was one of the hottest things she’d ever experienced in her life. The thought of Celestia sinking her big, fat fucking Princess cock Mariana Trench-deep into this crazy mare’s tight pucker almost made Mary come on the spot.

She desperately wanted to have a front-row seat to Twilight’s anal destruction. It would be another lesson the young alicorn would never forget, even as she broke Mary’s cunt wide open. The truth of her own ambivalence shook the doctor almost as much as Twilight’s driving hips against her own.

She’d always known, but now it was clear: Mary was pretty fucked up, too.

The doctor decided that she would leave it all up to chance as Celestia approached, snorting hot breath in her incorrigible zeal and wielding her cock like a weapon in her hooves. Mary caught the Princess’ gaze, mentally begging her lover to take her pleasure in whatever manner she saw fit.

“Do it,” Mary muttered, and Twilight chuckled, thinking the human was simply putting up a brave front. “You want to break something, I can tell. Agghh, fuck…come on, you freak. Put on a show. Do it!”

Mary’s words barely carried over the wind, but Celestia seemed to respond, tilting her head as she re-focused her attention on the writhing buffet of flesh laid out in front of her. She pointed her monstrous prick downward, aiming it directly at the jostling junction between Mary and Twilight’s bodies, and the doctor held her breath as she felt the stress build on her suddenly too-small anal ring. It occurred to her at that moment that Celestia’s mind might be so screwed up she’d tear Mary apart with her royal bludgeon, forgetting about any magical protection in her rush for release. She shuddered at the thought, but they were all well past the point of no return.

Fuck it, then. There were worse ways to go.

Celestia’s horn gave off a weak glow, and Mary grunted, feeling jets of precome splash against her winking taint. She recognized the strange sensation of body shaping, reveling in the cool wash of comfort mixed with extreme pleasure as she welcomed the Princess into her asshole like a prodigal daughter. Twilight showed a startled expression as she abruptly sensed Mary’s hole stretching in a way that no human’s should have been able to, and she craned her head to glare daggers at the alicorn behind her, mindlessly forcing her way deeper into the doctor’s sticky rectum.

“You dare?” Twilight roared with pure indignation as her stubby horn blazed with power. “You presume to bring that disgusting pillar of flesh near your mistress’ holy vagina, you cretin? You would even use magic when I expressly forbade it? I should strike you dead for such sins!” Celestia’s big body levitated, pulling backward until the tip of her cock slipped out of Mary’s ass with a pop, and then the Princess was spinning wildly through the air toward the open ocean while Mary watched the arc of her flight with a dumbfounded look.

Mary tracked Celestia until she hit the warm afternoon waters at least a kilometer from shore with an enormous splash, right in the path of a massive wave that had not been there a second ago. It rolled over the spot where she landed like a blue-green train, and the next moment, she was gone.

The doctor wanted to cry out, but she forced herself to believe in Celestia’s preternatural toughness. She had her own problems to worry about as Twilight turned to face her again — the young legend’s face was wroth as she slammed herself into Mary, wrenching open the human’s cervix a little more with each thrust.

“What did you think would happen?” Twilight hissed as that final barrier began to give way. “Did you think Celestia would save you? She’s a shell, hollowed out, emptied of everything except whatever I want to fill her with…and believe me, I have a lot to give. What I’m doing to you, I’m going to do to her…over, and over, and over again. Mmm…I can feel you fluttering in there. Is that fear, or lust? If you’re still alive after all this, I suppose I can appoint you my official semen cleaner. I’m sure there’ll be plenty to…NNNGH!”

And Celestia said Mary talked too much. In her righteous fury, Twilight hadn’t noticed the doctor’s expert manipulation of her internal muscles against the prick that was now well buried inside that stretched-out womb. The Princess’ magic was still working, allowing Mary to use all her dirty tricks to massage a grape-flavored gift from those purple balls, rippling her core in ways that would make a belly dancer hang up her bells. Between the natural tightness of Mary’s cunt and the crushing pressure of her cervix around the head, Twilight’s inexperienced cock hadn’t a chance.

“No…I won’t…I can still…nnn…no! No, no, no!”

But it was pointless to hold back the inevitable. Twilight gave one last bone-crushing slam against Mary’s upturned hips, then the doctor felt those grapefruit-sized nuts tense up, pulling against the base of the legend’s horsecock before they began to pulse with an uncontrollable rhythm. Twilight’s howl was a mixture of disbelief, anger and ecstasy as her prick throbbed, firing shot after shot of thick come deep inside the human beneath her — though it wasn’t a patch on Celestia’s legendary loads, the young alicorn produced much more than a human’s, or even a normal horse’s emissions.

Mary watched as her belly swelled with the deluge, until it looked like she’d swallowed a beach ball. She felt chilled to the bone, as if the magical fluid inside her was right out of a deep freeze, and she marveled at how different the sensation was from Celestia’s blazing heat. The doctor bit her lip as she felt the backsplash pulse from around the tight seal of her cunt, trying not to let her eyes wander to where the Princess had been thrown. If Twilight’s fearsome expression was anything to go by, Mary was going to need to focus her attention on what was right in front of her.

Twilight stumbled backward, groaning as her softening prick slipped from Mary’s soiled gash. With a flash of light, the magicked prick vanished, revealing the young alicorn’s blown-out cunny once again, still twitching and trembling with orgasm. Twilight’s knees buckled, but she did not fall to the sand, only letting the waves of pleasure roll over her where she stood.

“You…are a devious one, Dr. Parvotti,” Twilight gasped. “Now. Tell me why I shouldn’t murder you and everyone you love. Celestia disobeyed me. You know the penalty for that, don’t you?”

Mary licked her cracked lips. “You’re the one who drove her out of her mind. I can’t control her, and it looks like neither can you. Did you want her to kill me?” The doctor put a hand to her full belly. “Did you want to kill me?”

Twilight hesitated, and Mary could read the indecision in her expression before it settled into resignation. “No. I suppose I didn’t.”

Mary couldn’t help letting out a sigh of relief.

Twilight glowered down at the human. “I do now, however. Take a few more deep breaths, Dr. Parvotti. The atmosphere gets a little thin up there.”

Before Mary could guess what that meant, she felt her body growing lighter. Her butt left the sand, along with the rest of her as it floated into the air, rising higher and higher, faster and faster, until she was falling into the sky, her arms and legs flailing uselessly. For a precious moment, she could see the tiny figure of Twilight staring up at her from the dwindling island, then the young alicorn shrank into a speck, while the curvature of the planet stretched out into a full, horrifying panorama.

Chapter 3

Mary always knew her dumb fucking libido would be the death of her, but not like this.

Tragic bondage accident involving nipple clamps and an arc welder? Sure. Head-on collision due to creative yet ill-advised stick shift usage? Yeah, that tracked. Shot by a jealous lover after torrid getaway photos ended up on social media? Honestly, fair.

Yeeted into orbit by a pissed-off purple alien unicorn before the come could even drain out of her overstuffed womb? Not on the bingo card.

Swirls of Twilight’s pearly seed surrounded Mary, caught up by the same gravity inversion magic that was currently hurtling the doctor butt-naked through the stratosphere. The drops sparkled in the sunlight along with errant rocky grains, all suspended in place as if they were just floating merrily instead of moving at terminal velocity.

As Mary tumbled, the lines between heaven and earth blurred, inverting the domains over and over until she could scarcely tell the difference between them. She reached out frantically, her hands groping toward the detritus girdling her as if, by a touch, she could cancel the terrible enchantment and at least allow herself to reach an apex, ending it all with a hot splat instead of staying with her current frigid trajectory. But her fingers slipped past the shining crystals of sand and semen, and she felt only the breathtaking cold of the wide blue sky, quickly shifting to black, that was already stiffening her extremities.

Twilight could have at least tossed her a jacket. Or pants, or socks…anything would have been good, really. Mary’s sense of time was understandably skewed, but it had probably only been seconds since she left the ground, though it felt like forever. How much longer did she have? Another minute, two at the most? The draining sensation of her body heat fleeing was turning her inside out. Mary was going to die of exposure, without even being able to do the doomed snowstorm victim thing of passing away blissfully in her sleep. Life was unfair.

A white haze covered her vision, and a sudden chilly wetness soaked her skin as if she’d been plunged into an icy lake. Of course, she had to pass through the one cloud in the entire sky this high up, damn near flash freezing her and cutting her survival time in half. At least she was growing numb now, feeling less pain in her lips and toes…which was actually a very, very bad thing, but what difference did it make? The sooner this all ended, the better. What was she waiting for?

Mary broke out of the other side of the wispy curtain, noting in her existential terror that the droplets of come still pouring out of her gaping cunt had solidified in mid-air. The gleaming bits twinkled against the darkness of space, forming strange asterisms, and Mary admired their ethereal beauty before remembering what they were and where they’d come from. Then, she wanted to crunch the stupid crystals between her teeth like grape Pez.

Fucking mule couldn’t even let her have a lyrical death. So unfair.

A crust of ice began to develop on her body as Mary approached the boundary of space. She blinked, but her eyes did not re-open as the brutal cold froze her eyelids shut. Her existence became nothing but darkness and howling wind in the frostbitten ears of a body in motion, though even that constant sound was starting to fade as her senses dulled, and her mind turned inward in the way of all sentient creatures on the verge of death.

If she ran into Newton in the afterlife, Mary wondered if he’d laugh or cry as she tried to explain the principle behind magical acceleration. It was an idle thought that was unlike her, and a corner of her awareness knew that she was now deep in delirious shock, but that was fine. Mary had never been very religious; she’d grown up Catholic, though as her natural proclivities made themselves apparent upon adulthood — before that, if she was honest — she soon came to understand just how incompatible her personal morals were with the tenets of Christianity. And so, staying true to herself, she clung only to those ideals that resonated with her, treating the rest as unnecessary baggage.

Bullshit…that was too kind. Mary used others’ values as surgical tools, cutting deeply into the people around her while desperately trying not to let the scalpel slip. She hadn’t always been successful.

Facing annihilation now, would Mary have done anything different? No. She was astonished to realize that she harbored no regrets, now that it was all coming to an end. The doctor felt a little cheated about not having the full measure of her life pass before her eyes like she’d expected, but from the bits and pieces floating through her dying mind, she knew she could face eternity with her head held high.

Well…there was one thing. As Mary began to slip away, her last conscious thought was her wish to see Twilight take the ass-kicking she had coming to her. Or barring that, the mental healing and reconciliation that she also deserved. Justice was weird like that. People were weird like that. She knew Celestia would have agreed…

Mary felt a jolt of softness, as if she’d landed deep in a pile of feather pillows. Had she breached that final barrier at last? She wanted to open her eyes to behold the splendor of the next world, but her body wouldn’t obey her commands. The doctor only felt an unusual sensation that she eventually recognized as heat, fierce yet kind, burning away the piercing chill that had been her constant companion and replacing it with healing warmth.

“Forgive my tardiness, little pony. I’ve been a bit…indisposed.”

It seemed that Mary wasn’t dead quite yet. Her body was clearly shutting down, however, and now she was hearing the one voice she wished to hear above all others. It was a hideously cruel trick, but instead of crying out in rage, she only croaked a word out of a throat that was, at last, beginning to thaw.

“Tia?”

A shudder went through the plush something against Mary’s skin, and she heard a relieved exhalation of breath. “Yes, Mary. I’m here.”

Fingers with a new wealth of feeling recognized the short, soft fur covering a chest that was working like a forge bellows, stoking hot blood and breath to feed a dire need. Mary felt the frozen scales fall from her disbelieving eyes, and she gazed up at a snowy equine face topped with a horn that shone with perfect resplendence.

Celestia — beautiful, maddening, perverted, wondrous Celestia — looked down at Mary with an expression filled with such happiness it almost made the whole ordeal worthwhile. She was wreathed in a corona that burned with all the colors of the rainbow, and the icy particles around them sizzled and evaporated upon contact, unable to withstand such overwhelming flame. The doctor felt life returning to her exhausted limbs, and she could no longer deny the truth that now embraced her. The Princess was real, and Mary would not die. Not yet, anyway.

Mary wanted to laugh, or shout, or dance a jig in mid-air, but instead she felt hot tears streaming across her cheeks, billowing out into the wind. Rationally, she knew she was feeling a mixture of relief, elation, and any number of other extreme emotions, but there was a deceptively simple core underneath all the rest. Mary said the first thing that came into her head as she sobbed against her lover with complete abandon, and they were the most genuine two words that had ever sprung from the lips of such a born liar.

“Thank you.”

Celestia returned Mary’s heartfelt regard with a gentle smile of her own, but it was strained with effort. Her eyes were bagged and ringed with dark circles, making her look like she hadn’t slept in days, though it had been no more than a quarter of an hour since they’d last seen each other. “Your thanks are a bit premature, Doctor. You know I like being appreciated, but let’s shelve the happy reunion for now.”

Mary struggled to contain herself, wiping her eyes with new determination as she took stock of their situation. They were still rising fast, and the doctor looked up to see stars shining with a diamond-bright intensity that she’d never seen from the ground. The disc of the moon hung in the black sky like a hole in reality, and the contours of its great mountains and valleys stood out in sharp relief, as if they’d been painted in oils by an old master.

They were almost in orbit, and now the only thing keeping Mary’s insides from boiling into space was Celestia’s fiery protection. But it was starting to look like that might not be enough to get them out of their predicament, as Twilight’s spell was still going strong, and their current vector was somewhere between Gemini and Orion. Being saved from freezing to death wasn’t that great if the alternative was spending the rest of that life drifting through the interstellar void.

“This is…the part where you say everything’s going to be all right,” Mary rasped, struggling to find her voice again as she fought off panic. “What’s the problem? Why are we still headed out of the Solar System?”

“Someone’s demanding,” Celestia grunted as beads of sweat poured from her forehead. This was a frighteningly unique phenomenon, as Mary had never seen the Princess sweat, not even in Erin’s dream. “The problem is that Twilight locked her spell with one of her cute puzzles. It must be an original creation, because I’ve never seen one so complicated. Just…give me a moment.”

Mary felt a spike of cold fear overcome Celestia’s blazing fire for a brief second. She clenched her teeth to keep from saying the thought that came unbidden: “You’ve never been able to solve any of Twilight’s puzzles.” That was the last thing either of them needed to hear right now. Celestia would figure something out…she always did. Doing crazy shit like this was like her superpower, right? Mary couldn’t give up hope, not now. Maybe they could-

“There we go.” Celestia’s horn blazed with a final burst of power before settling into a weak incandescence, and the Princess let out a hiss of breath, yet the strain in her face did not lessen. “Hold on tight, little pony. The ride down is going to get rough.”

“Huh.” Mary couldn’t quite think of a better response.

Then the bottom dropped out of her stomach, and she gulped down a wave of nausea as their demented elevator ride slowed to an abrupt stop, offering a momentary taste of weightlessness at the vertex of a terrible parabola. Celestia’s technicolor mane wreathed her like a lion’s majesty, floating wild and free, and the strands tickled the doctor’s face as she clung to the Princess’ barrel. Far, far beyond, the stars seemed to call to her, and before she could stop herself, Mary reached out a hand to grasp one of those faraway points of light, knowing that she would never be more fully surrounded by such perfect beauty than she was at this exact moment in time.

But before Mary could claim her shining prize, the natural pull of gravity reasserted itself, and the cold perfection of those heavenly bodies retreated for all time. The doctor felt herself starting to slip out of the Princess’ clutches as they both began to drop, and Mary wrapped her arms tightly around Celestia’s neck, fiercely digging her fingers into the cashmere-soft hide as she watched the world below grow in her view. She felt her legs come up above her as their descent picked up speed, and the two lovers plunged head-first back to the pale blue dot that was their home, in this dimension and the next.

Mary wasn’t ready to die yet. She knew this now, without a glimmer of a doubt. She wanted to see Erin become the best version of herself she could be. She wanted to convince Luna to extract the stick from her ass and live a little, instead of watching others do so. She wanted to make tight little Julie scream her name again. She would have even liked to hear Lt. Kurosawa give her grief one more time.

More than anything, however, Mary wanted to get to know the true Sun Princess Celestia, instead of the distorted version in her head that had led her to such pitiful misjudgment. Somewhere along the way, she had started to conflate “ageless” with “unchanging,” and the doctor cursed herself for doing the Princess such a disservice. Why did she think that Twilight was the only one who could grow and learn over the long centuries? Why did she take the younger alicorn’s brilliance for granted, while discounting Celestia’s intelligence, wisdom and innumerable experiences? How had she failed to understand someone she cared so much for, so badly?

Mary scarcely heard the cold air whistling past as she plummeted, so mortified was she at her own hubris. She could only hope that Twilight had underestimated her former mentor just as thoroughly.

“Guess you’ve been practicing your solving skills, huh?” Mary shouted over the howling winds as the blue-green Atlantic stretched out beneath them. “You use an algorithm, or just brute force it?” The doctor knew she was babbling at this point, but she needed to unburden herself, even if this wasn’t exactly the perfect time. “Look. I didn’t mean to doubt you, okay? I, uh…I need you to know that. I should’ve believed in you the whole time. You may be a weird fucking deviant, but you haven’t let me down yet. And I know you won’t let Twilight down, either.”

The Princess didn’t respond right away. This did little to calm Mary’s nerves as the air blew past her ears, and the doctor risked craning her neck away from the protection of Celestia’s barrel to get her bearings on the alicorn’s condition. She was shocked to see eyes tightly closed, and a face furrowed in pain.

“Hey. Stupid question, but you all right? I know you’ve been putting in work, but they say communication’s the key to a good relationship, especially when you’re in freefall from a few miles up. Talk to me, Tia.”

Celestia gave a dry chuckle that turned into a rattling groan, and the sounds were barely audible over the atmospheric noise of their descent. “I’m afraid…that I’m not all right, little pony. My magic…has been tapped…that puzzle…harder…than I imagined…” Each word was hard-won, drawing from reserves that were quickly running dry. “I’ll try to…keep you alive somehow…when we alight…but no promises.”

When we alight…as if they would come to a gentle rest on the tiny island like dragonflies on a fucking rosebush, instead of leaving a smoking crater on the beach or slamming face-first into the Atlantic. Mary was starting to feel more of the cold flowing across her bare skin now, which told her that Celestia’s protection was waning fast, and suddenly their chances of survival began to approach a percentage that was much too low for comfort.

“Your plan does not inspire confidence!” Mary gripped Celestia’s underbelly tighter with her thick thighs, brushing the alicorn’s feathered pinions with the soles of her feet. “How ‘bout you show off what these wings can do? Or are they just there to look cool?”

“I regret to inform you…that my ass is even less aerodynamic…than it looks,” Celestia grunted. “I can’t even glide…without my magic. I’m so sorry…little pony.”

“You can apologize after I’m dead,” Mary said fiercely, though the outburst was more to hide her fear than anything else. Of course, Celestia was right. Unless she was hiding a two-stage booster rocket up her rectum, she couldn’t have made it from under the ocean to the edge of space without mystical assistance. All the costs of her rescue began to add up in Mary’s head — the flight, the comforting halo against the cosmic vacuum, the cracking of an unprecedented spell lock — and suddenly it was the doctor who wanted to beg forgiveness, even as Twilight’s coup de grâce became all too clear.

Meanwhile, they were still in a tailspin toward an island that was growing larger every second.

It couldn’t end this way. Mary was going to go out with a cute girl munching her box and a dildo the size of a caber up her ass, not splattered into a fine mist against the merciless ground. There had to be something…she needed to think…

Mary began to carefully climb around to Celestia’s withers, taking each hand and toehold one at a time, knowing that if she lost her grip, it was all over. The Princess stirred as she felt the doctor working her way across her limp body.

“What are you…please…you need to hold on tight…”

“Shut the fuck up for a second. I want to try something.” Mary meant to tell Celestia to conserve her strength, but her haste blunted her words. And it was less a try and more of a desperate gamble, but the doctor didn’t see any other options as she clambered onto the top of that broad white back.

With a strong enough magical kick, one could jump-start a spell though an alicorn’s horn. If that was the case, was it possible to do a direct transfer of power, without a conjuration in progress? Celestia had once said that Mary possessed a spark of magic somewhat higher than the human average. If so, the doctor had to hope it was enough to get some flight going, or at least a more controlled fall. And she had to do it post-fucking-haste.

Mary took a deep breath, feeling chilled air enter her lungs as she reached for Celestia’s spiral of ivory. Though it was no longer illuminated with magical energy, the doctor still found the foot-long spike dangerously imposing, representing a depth of power that she had to hope was not yet completely spent.

At any other occasion, Mary might have been hesitant to touch Celestia’s equipment after such intensive use, but she had no time to consider any lingering effects. The doctor firmly took the horn in both hands, feeling a current of electric warmth under her palms that sent tingles up her arms and across her chest in heart-stopping cycles. She began to stroke the pale spire like a cock as her body instinctively reacted to the familiar form factor, and she licked her lips in preparation for the next step.

Mary was playing all of this by ear now, and she tried not to think about scary concepts like magical feedback or overloading as she brought her face closer. Fortune favored the bold…and the desperate.

The flat of Mary’s tongue caressed the textured ridges of Celestia’s horn, and the doctor felt a jolt that momentarily overwhelmed her, as if she’d licked a charged 9-volt battery. She forced herself to stillness, and the intense sensation unfolded like a flower upon her taste buds, revealing itself to be an ultra-concentrated flavor that took a few seconds to decipher as she brought her lips to bear, licking and sucking the surface of the proud spiral with practiced skill.

It was vanilla. And not in the sense of default blandness…no, this was anything but. It was the taste of vanilla beans, pure and sweet, infusing Mary’s mouth with the impression of the creamiest root-beer float she’d ever drank. Or maybe it was a devil’s food cake, fluffy and moist, piled high with frosting so rich she felt her butt grow another inch just imagining it.

The taste of Celestia was a decadent melange, and Mary’s original mission became secondary as she brought her mouth to the rounded tip of the horn, opening herself wider to admit the candied spiral into her gullet. It was impossible to take much more than the first few inches, unfortunately — Mary wasn’t completely heedless of the danger to herself sans shaping magic, and the turbulence rocking her didn’t help — but she was able to swallow enough to light up her more submissive pleasure centers, causing her to give an inadvertent horn job as her head went up and down. The doctor whimpered in confused bliss, while her hands stroked the bottom of the shaft, working it to completion.

Mary felt Celestia shudder underneath her tender manipulations, and she hummed deep in her throat, knowing that the sensitive spiral was transmitting each lick and suck to the Princess’ body like an antenna. Then Celestia twitched with a bolt-of-lightning sharpness, almost bucking the doctor loose, and Mary grunted, struggling to hold on tight.

She quickly extracted the horn from her esophagus with a moaning gasp, as if awakening from a blissful dream. As she did so, she felt the tingle of an energy she’d never felt before in her life, and her limbs suddenly became heavy, like she’d just run a hundred-meter sprint. Something had happened.

“Celestia?” Mary said, her voice slurred. “How you feeling? Did that do it for you? I swear to god, if I have to climb up and stick this thing in my-“

Before Mary could finish her thought, Celestia’s horn blazed with a stark radiance that defeated her vision, leaving ethereal afterimages in the encroaching darkness of late afternoon. Then there was another jostle, and Celestia’s no longer vestigial wings unfurled, inexplicably growing to twice their original size as they cupped the wind, freed from the shackles of conventional physics at last.

“We’ll revisit that later tonight,” Celestia said in a teasing drawl that promised much. Her voice had a new strength, and Mary was relieved to see that some of the exhaustion was gone from the Princess’ face…some, but not all. There was still a lifetime of tension in her expression, enough that even Celestia’s famed composure couldn’t completely erase it from the corners of her mouth. “For now, little pony, there’s something I need to finish. A certain purple alicorn needs to learn one last lesson…whether she wants to or not.”

“Cough…shit, yeah. Go off, Princess.” Though they were both running on fumes, Mary wouldn’t have bet against Celestia in the conflict to come, no matter what form it took. She almost felt sorry for Twilight…almost, but not really. Despite the shattering trauma the young alicorn had suffered in the past, attempted murder could not be so easily swept aside. There was about to be a goddamned reckoning, and Mary was all the way down.

Fuck that little fizzy-pop tyrant. This wasn’t over yet, not by a damn sight.

Celestia wheeled over the small island, banking toward the beach where destiny awaited. Mary was impressed at how natural their flight felt — if she didn’t know any better, she wouldn’t have guessed that they were being held aloft by wishes and will alone. It spoke to the Princess’ expert spell casting and fanatical control in the face of extreme pressure, becoming just one more reason why the doctor could no longer deny her feelings for the eccentric alien creature.

Mary had never been in love before…not really. She’d had some crushes, and she even thought she knew what true love was at certain points in her life, but those instances faded into darkness before Celestia’s glorious sunrise. She could only hope the Princess felt the same.

They’d have to have a nice, long talk, interspersed with frantic bouts of anal, when all this was over…assuming they were still alive, which had just become a much more reasonable presumption.

Mary could see the oceanfront now. The sparkling motes of salt crystal made the landscape look as though she’d gone in the opposite direction, drawing starry formations reflecting the red nebula of sunset against brilliant sands that might have spilled from the basin of the Milky Way. And in the midst of such magnificence was the small figure of Twilight, looking up at their approach with an infuriatingly relaxed posture. If she was surprised or disappointed by her foes’ miraculous return, it didn’t show.

Twilight watched as Celestia made her landing on the wide beach, kicking up gouts of sand as she trotted to a stop, her hooves digging in deep to stop her motion. The cessation of velocity felt almost as strange to Mary as the unnerving way the Princess’ wings shrank to their usual size, but she was glad for such a long-awaited dose of stability. She slid off Celestia’s back, floating down to the cool earth cradled in a mystical cocoon of feather-lightness.

Mary could still barely move — the magical transfer had taken more out of her than she expected — but the doctor forced herself to at least sit upright, not wanting to miss what was coming for anything in the world. “Hey,” she called.

Celestia turned her head toward the doctor.

There was a lot Mary wanted to say, but she settled on what was foremost in her thoughts. “Don’t die.”

The Princess’ gentle smile, as unguarded and genuine as Mary had ever seen, was the sun after a storm. “That’s the plan, little pony. Now, stay there. I’ll be done in a moment.”

And she turned away, walking along the lonely beach toward Twilight.

Master and student squared up, posturing like territorial wolves as each carefully approached the other, watching for the slightest hint of weakness. The sun was dipping below the horizon, and the sacred darkness of the ocean conjured up nameless fears from the depths of Mary’s primal mind, yet she knew that nothing beneath the waves or above it could stop this pair of demigods from doing what they came here to do. This was a battle of blood, salt and semen, inevitable as the turning of the world…except it felt like the world stopped to watch, too.

Celestia’s monstrous cock was a thick lance three feet long, as hard and dangerous as forged steel, and Mary noticed how easy her movement was with such a weapon between her legs. This was not the first time the Princess had used her royal pride as an engine of war, and from the throbbing and rumbling of her massive balls, she’d missed the good old days. Twilight gazed at Celestia’s mighty piece with an expression that was equal parts disgust and admiration as the two went round and round.

“You’ve gotten stronger.” Even Mary could hear Twilight’s note of grudging respect.

Celestia didn’t respond straight away, but her cock lurched and released a spurt of precome that sizzled as it hit the cooling sands. The older alicorn tilted her head as she listened to a different sound, reacting with a mirthless smile to a certain insidious voice.

Twilight frowned at the strange motion. “I’m sorry. Am I bothering you? Did you hear what I-“

“You tried to kill Mary.” It was a simple statement, said simply. “You’ve exceeded our…my expectations, Twilight.”

“I’ve been doing that my whole life. Although in this case, I was only putting into practice what you taught me.” Twilight’s voice rose a few octaves, and now she sounded hundreds of years younger and more naive. “Use your enemies’ assumptions against them. Play up perceived weaknesses, and hide your true strength until the critical moment.”

The slight twitch in Celestia’s cheek was the only sign that she was affected by Twilight’s childish tone. “I never wanted to make you an enemy, but I suppose we’re well past that now. I’m going to fuck you until you love me again, Twilight. And then, I’m going to stop all of this.” Celestia gestured with her horn at the sodium chloride crystals doing their deadly work along the shore. “If you truly want to understand what it’s like to force your will upon another, I’ll show you.” The Princess let out a low chuckle. “Or maybe I should say…I’ll remind you.”

A spasm of rage passed over Twilight’s face, but it quickly faded as the young alicorn ignored the weak bait. “Whenever you’re ready,” she said through gritted teeth.

Then, she waved a hoof toward Celestia’s fat cock. “But I must admit, you have me at a disadvantage. The great Sun Princess wouldn’t want to be unfair, would she?”

“Do not give that bitch a dick!”

The words flew out of Mary’s mouth unbidden, but she didn’t care. Celestia wouldn’t fall for this obvious trap, would she? This wasn’t fencing at the Olympics, it was a battle for the fate of the world! Use a Glock if you have to! Dual wield that shit! Fuck fair!

Mary wanted to say all this, but the exertion of her outburst drained the rest of the energy from her, allowing only an annoyed groan. Celestia ignored the doctor, only nodding as her horn lit up the night.

Twilight winced, and she looked down at the new length between her thighs. Instead of something like her previous size, she had been granted an exact replica of Celestia’s own cock, except colored a mottled purple with dark blue spots. It was comically big on her smaller body, with the tip extending past her front legs, but she seemed to know how to sling the massive instrument as she walked a few paces, at the same time getting used to the extreme weight and balance of the massive indigo balls hanging almost to the sand.

Celestia’s glow faded, and the night rushed in once again. “There. Now, then.”

The only warning was a deep, rumbling growl from the depths of the Princess’ graceful throat before she pounced upon Twilight like a panther on prey.

Caught flat-footed by Celestia’s sudden attack, Twilight tried to dodge out of the way, but she was far too slow. The Princess slammed her former student down hard onto her back, with the impact stealing the wind from her lungs. Pressing the advantage, Celestia climbed atop her opponent’s short thighs, shoving a gold-shod hoof against Twilight’s neck as she bit down hard against the tip of the young alicorn’s sensitive prick, making her cry out in pained anger. And yet, Twilight's purple balls lurched as a spray of precome launched from her cock over her shoulder, befouling the tide-soaked sands behind her. There was a thin line between ecstasy and agony, and Celestia knew how to play it like a violin string.

Mary couldn’t help feeling a glimmer of pride. She really did learn!

Twilight tried to break free, but Celestia held on with just the right amount of leverage. The distraction of erotic pain gave the Princess enough time to line her cock up against Twilight’s twitching, upturned asshole, and the young legend’s entire body spasmed as Celestia began to force her meat into that resisting, inexperienced orifice.

Celestia removed her teeth from Twilight’s cock as she bent down to her foe’s snarling face, enjoying her struggles as she kept pressure under the chin with a sure hoof. “At last. I finally get to sample my Faithful Student’s precious anus. You have no idea how long I’ve been waiting…dreaming about this tight little hole, wondering night after night how it would feel wrapped around my thick cock. Fuck…it’s even better than I imagined. Whatever exercises you’ve been doing to keep your rear so…compact have been working wonders.”

“Don’t…call me that! Don’t you dare! You no longer have the right!” Her youthful voice was strident as she fought against the unnatural strength holding her down. “You should never have influence over another pony for as long as you live!”

Celestia did not deny a thing. “If that’s what you think, then try to stop me. Be the heroine everyone thinks you are. Or have you given all that up, too?”

Slowly, methodically, Celestia began to work her cock into Twilight’s rear entrance, stretching it with steady force until the flat head of her prick popped into the narrow channel, causing the younger alicorn to scream and flail wildly.

“Fuck…oh, my Faithful Student. Take my fat dick. Nnnn…yeah, good pony. Good, good pony. You know what this asshole is for, don’t you? It’s for taking big cocks like mine. Normally, alicorns like us can go either way, but you…you like it from the bottom, don’t you? My word, I’ve never tasted such natural born rapebait in all my years. Nnnfff…no, don’t try to push me out. You’re going to take all this dick, until my balls hunch up against your cute little butt and inject you with 300 years’ worth of spunk. That’s the kind of pony you are, Twilight.”

Celestia’s serpentine tongue uncoiled and stole a drop of sweat from Twilight’s cheek. “That’s the kind of pony I made you.”

Twilight roared as she strained every muscle in her body to buck herself off the ground, making Celestia lose her grip just long enough to land a double-hooved kick to the Princess’ barrel, knocking her away and extracting the head of that fat cock from her asshole with a loud pop. Celestia brought herself upright in a flash, but Twilight was hot on top of her, and soon Mary was watching in disbelief as the two prideful creatures wrestled like feral beasts coupling in the surf, snapping and growling as they kicked up explosions of sand and seawater that could likely be seen from orbit.

Not a quantum of light shone from either horn. This wasn’t the kind of problem that could be solved with magic. It was a battle for dominance in the purest, most literal sense of the term, a desperate conflict where the loser would find themselves enslaved, forced to become a snug hole under the winner’s conquering prick. The pure savagery of the alicorns’ struggle as they tumbled across the beach, knocking over salt plinths that silently regenerated as they passed, shocked Mary as much as it excited her. Twisting like angry snakes, each tried to fuck the other into submission, and for a while it was impossible to tell who had the upper hoof.

But if Twilight made the first mistake, Celestia committed the second. The Princess was not used to trying to immobilize an opponent so low to the ground, and Twilight made the most of this as she slipped underneath the older alicorn, flipping her onto her back with a quick shift of her balance. Before Celestia could regain her bearings, the legend got her foe onto her belly, and she went for a mount, climbing atop that fat ass while twisting their rear legs together in a nigh unbreakable joint lock. The Princess’ wide buttocks naturally curved upward, ready for penetration.

Despite the adverse outcome, Mary was impressed. It looked like the whole MMA training thing had some truth to it.

“It’s all so clear to me now,” Twilight hissed as she hot-dogged her big cock between Celestia’s massive flanks, anticipating the wonders to come. “This whole time…everything you did, every manipulation or familial thought you ever put into my accepting little head. Even the stupid poison joke. It was all so one day, I would finally lose it and f…f…fff…fuck you like you deserve! Like you’ve always deserved!”

Celestia craned her neck to give a doggy-style look back, fixing Twilight with a defiant sneer. “Interesting hypothesis. Only one way to test it…but be warned, Faithful Student. Many have tried. And frankly, I don’t think you have the balls to fuck the bitch out of me.” She flexed her haunches, making the thick booty clap against Twilight’s purple truncheon. “You think you know how to use that thing? Silly little pony. Why don’t you stop now, before you embarrass yourself?”

As they sparred, Mary saw that the tide was going out again…way out, farther than normal, revealing the hidden shelf of coral and undersea muck closest to the beach. But she was scarcely able to consider this detail before Twilight’s moans demanded her attention.

The young alicorn was rutting against Celestia’s ass, sinking her cock further into the snowy cheeks until the flat tip at last kissed the clasping star of the Princess’ anus. Celestia jerked and writhed as she tried to throw off her attacker, but Twilight kept a sure hold while her pert, purple bottom jabbed and thrust downward, forcing her massive cock against that hole with ever increasing fervor until, with a juicy schlup, the first third of her prick sank into Celestia’s suddenly stretched-out rectum.

“Oh…oh, fuck! I can feel your soft membranes…so sticky against my…Nnnn! What is this? It’s so…so good! So sweet! I need it! I have to take it!” It was like Twilight was trying to fit her entire body inside Celestia’s succulent asshole as she took her pleasure, forcing every delicious inch of herself as deep as she could reach. Mary could only pant in sympathy, having had first-hand experience with the effect of the Princess’ colon on an unsuspecting cock.

Celestia reached behind herself, grabbing one fat flank in each hoof and spreading her pale cheeks wide, showing herself off as her own mighty prick dug deeper into the sand with each frantic slam of the alicorn taking her. “If this is an ass-fucking, I’m still a virgin. Are you afraid of it? Understandable, really. This pretty hole has driven ponies much more motivated than you out of their minds. They couldn’t take the heat…the pressure. They all came as soon as they got the barest taste. How long do you think you’ll last, Faithful Student?”

“I’m going to fuck you into the Earth’s core!” Twilight screamed into the night as another foot sank home into Celestia’s rear, then she pulled back and slammed in again, over and over, settling into a savage breeding rhythm that made the Princess’ buttocks wobble like jelly as they were clapped red by big, candy-colored nuts. ”I’m going to fuck you until you love me! Your ass is mine! Your smart mouth, your skinny horn, your ridiculous mane…it's all mine! Mine!”

There was a strange tension in the air, beyond the obvious. Mary couldn’t hear any birds, or insects, or any other animals. Even the sounds of the sea were muted, as if the old gods were holding their breath, waiting to pass judgment on the participants of this titanic showdown. The tide had still not come in, and a crawling sensation raised the hackles on Mary’s neck. Something was coming…something big, something menacing.

“Nnff…nnff…nnff…soon…soon I’m gonna show you what being a slave is like, Celestia! You think you’ll enjoy it? You think you’ll manipulate me into letting you go? If you believe that, you really are…nnn…so tight…gonna fill your fat bottom with my seed! Gonna keep you stuffed with my come for the rest of your life! Ohhh…I have such plans…nnnfff…but your ass…so hot…so good!”

Twilight didn’t notice right away, but Mary did. Celestia certainly did. Yet the young alicorn pressed on with her anal invasion, slapping her fat nuts against the Princess’ wide-open rear until she could finally, finally feel the tears rolling down her cheeks, falling into the cleft of Celestia’s ass and pooling between their straining thighs.

Twilight put a hoof to her face in wonder, even as her hips kept up their wild motion. “What…is this? What did you do to me? This ache in my stomach…and in my crotch……so…so hungry! Why can’t I stop? What did you do, Celestia?”

Mary saw Celestia’s balls start to tremble, and the older alicorn sighed at the familiar sensations as she turned away from Twilight, staring out into the cold, unfathomable ocean. “I’ve given you my final lecture, Twilight. It’s an apology…and a warning. It’s a deadly weapon, and an offer of truce.”

Celestia’s eyes shone as she turned back to face her former student, who was beginning to panic and whine at the intensity of the urges roiling her body. “It’s a gift I wouldn’t give to my worst enemy, but you’ll need it in order to become what you were meant to be. This, my dear, dear little pony…is one percent.”

Twilight’s expression was maddened. “You lie! That is a lie! This is impossible! You can’t live this way…it’s a waking nightmare! You’d have to be insane!” She screeched as Celestia began to work her interior muscles. “Stop! Please! I can’t take this!”

“You can, and you will. Five percent.”

Twilight began to gibber, and saliva flew from her slack jaws as she humped like a monkey against Celestia’s ass, barely holding onto her sanity as her body betrayed her. “Nooo! I can’t! I’m going to die!”

“You won’t. You were my student, after all. Ten percent.”

Against the foreground of Twilight’s dissolution, Mary spied a black wall of water on the ocean horizon that was getting closer every second, growing taller and taller until it blotted out the stars, and a hazy roar entered the doctor’s ears. But somehow, this calamity seemed secondary to what was happening right in front of her.

Mary’s new understanding made her feel like she’d never known anything at all.

Celestia’s lust was an awesome power. It was a force that even the most talented alicorn in hundreds of years was utterly helpless against. A mere ten percent of it — fifteen, now — had the vanquished Twilight grunting like a primitive beast, caring for nothing except the feel of a tight asshole around her cock and the drive to empty her full nuts. Celestia gazed at her former charge with the sympathetic face of a goddess, knowing that this lesson would be engraved upon Twilight’s soul forever. Because now, they all knew the truth.

That truth was this: though Celestia’s passions were strong, there was a power greater still.

It was the power needed for an alicorn to compartmentalize twisting manias that would drive other ponies to tears, making the act look like the most natural thing in the world. It was the power required to deal with affairs of state and calamities of every scope with perfect grace, even when one’s most basic needs were screaming for release. It was the power that had guided Celestia for a thousand years, and would for as many more as needed, until Canterlot’s eternal beauty had been assured.

That power was love. Only that, but it was more than enough.

“I love you,” Celestia said to Twilight, although the young alicorn was beyond hearing. “And I love you, Dr. Mary Parvotti. I love my ponies, every one, and I love my kingdom. If it wasn’t for that love, all would have been consumed within my flames long ago, but I’ll never let that happen. I know that such burning ardor is dangerous...and wild…and maybe I don’t deserve to hold the beautiful, pure jewel that is Canterlot in my hooves, but it is mine to safeguard, and I shall. I can do nothing less for those I love.”

The low roar was now deafening, but Mary scarcely noticed the skyscraper-sized wave that was about to engulf them. Twilight’s broken wail heralded her coming, and spurts of tacky cream splattered from around Celestia’s sucking asshole, combining with the Princess’ own emissions as her pearlescent balls emptied underneath them both. And as the dark curtain fell upon all, Mary’s only wish was that she might have lived to see a more completed version of Twilight, one as brilliant as the original, yet imbued with Celestia’s unyielding love.

What a perfectly beautiful heroine that would be.

Epilogue

“Aaaaand, Tia for the save.”

Mary muttered to herself as she watched the sunrise from a small hill of sand a few meters away, so as not to impose upon the two alicorns as they spoke of old times. They both lay on the beach on their backs, one with a deflated yet defiantly impressive cock, the other with a cunt drooling with silky fluids, and their heads were close enough that they could speak softly, allowing the natural sounds of an island morning to drift across the salty air as their two horns touched in a tender, familiar way.

The doctor had awakened only an hour previous, her strength restored just enough to drag herself upright, and for a while, she let the conversation about shared friends and enemies pass in and out of her awareness as she luxuriated in her continued existence. All around her were the signs of a once-in-a-century tidal wave, with pulverized sand, detritus from the sea and hapless ocean creatures covering the beach for kilometers around. But in a clearing a few meters wide, containing exactly three individuals, the sand was still pristine and sparkling. Celestia’s magical protection was not to be trifled with: if Mary had ever had any doubts about that, they had been extinguished as surely as the plinths of sodium chloride that were even now dissolving into puddles all over the shore.

“They’re all gone. I can’t sense even one.” Twilight sounded more bemused than anything else as she marveled at Celestia’s feat. “I always knew there might be such a flaw in the plan, but I considered it totally theoretical. I never dreamed, for even a moment, that you’d be able to send waves down on every coastline around the world. So much for redundancy.”

Celestia chuckled, managing to sound cutely self-conscious. “It wasn’t a bad idea. Connect a series of magical objects to each other, as well as to a material source — in this case, the seas — and any countermeasures become very limited. That little dip in the ocean just happened to give me the opportunity I needed to weave the solution. If your toys couldn’t be destroyed individually, there was only one way to proceed. I did what was necessary.”

Twilight’s nod was slow and tired. “No wonder you’d drained your mana. Any other pony would’ve sent themselves into a coma trying to do what you did. And that’s not even mentioning that dirty trick with your penis. I never want to hear you even breathe the words 'fair play' ever again.”

Celestia gave another, cheekier laugh. “Why, I’ve never been so offended in my life. How dare you suggest I might have wrapped a spell within a spell faster than you would have ever expected, right before attacking so you wouldn’t have time to notice what I’d done? Harumph.”

The younger alicorn shook her head. “‘Underestimate the Princess at your peril.’ I’d heard that saying often, but I’ve never felt the truth of it until now. You never stopped learning, growing, fighting for your ponies. And here I am, screwing up a plot like a third-rate cartoon villain.” Twilight put a foreleg to her eyes, shielding them from the glare coming off the waves. “Fifteen percent, huh?”

Celestia touched Twilight’s flank with a gentle hoof. “It’ll get stronger as you age, I'm afraid. Cadance had to deal with it, too, although she’s…never had as much impulse control as I might have wished.”

“Obviously,” Twilight said in a flat tone. Then, she sighed deeply. “Well, if both of you can handle it, then I can. I’ll consider it…psychic training, or something.”

Celestia’s smile held pride and sadness in equal measure. “You could have kept running away from what you are, but now you’re facing everything head on. That’s wonderful, Twilight. I’ll help you as much as I can, I promise.”

Twilight said nothing, only staring into space, as if seeing all her future challenges laid out before her. Her eyes abruptly hardened with a new resolve as she rose from the sand on steady legs. She turned to Celestia as the older alicorn followed suit, brushing debris from her normally pristine coat.

“So. What happens now?”

Celestia gave her former charge a somber look, seeming to dread saying what had to be said. “Now, I’m going to send you to the dungeons to await trial, although since we’ve implemented the prison reforms you brought up before you left, the experience has become much less nasty than it used to be. Still…justice must be served, and I am a servant of justice. I’ll be with you every step of the way. Afterward…well, you’re young. You have much yet to learn, and I have much to teach.”

Again, Twilight went silent, knowing that there was little more she could add. She only squared her small shoulders, preparing for her fate as Celestia’s horn glowed with the transportation magic.

Before the spell could be completed, however, the Princess furrowed her brow. “Oh. Before I forget. Your dear brother Shining Armor is going to lead a delegation to the dragons in another week. Since I’d hate for Cadance to get lonely, I’ve invited her to stay over at the castle. Doubtless she’ll want to visit you in your cell sometime…right when the guards just happen to be away on patrol. It might even take a few hours, although I’m sure nothing untoward will happen in the meantime. Take care, dear Twilight.”

The look on the young alicorn’s face before she vanished into the ether made Mary shudder, and her cunt clench. She made a mental note to speak to Luna about getting something set up before everything went down. She didn’t want to miss a thing.

As Mary rose from her spot she caught Celestia’s eye, and the Princess’ expression said that she understood some of what the doctor was thinking.

“Three gifts have I given that pony now. The gift of her hymen that was stolen by one she trusted most, the terrible legacy of her alicorn heritage, and a drop of vengeance to cool her burning thirst. Yet, she threatened your life. Do you find my justice unfair, Doctor?”

Mary laughed as if she’d just heard the funniest joke in the world. “Princess, I don’t know what the fuck justice means in this scenario. Everything’s all screwed up. But recognizing that is probably the first step forward. I trust you, and Twilight trusts you. There’s not much more to it.”

Celestia looked thoughtful as she stepped toward Mary, picking up her pace as she saw the doctor sag to to her knees in a sudden swoon. “Climb up. I’ll take you home. I’d float you, but I’m rather done in, too.”

Mary grinned as she clambered onto Celestia’s back. “Hi-ho, Silver. You know I’m never gonna let you live this down, right?”

Celestia gave a last look out toward the bright sunrise before turning toward home. “Just don’t tell my sister. She might get the wrong idea, especially if she finds my bit and bridle. Now heal thyself, Doctor, and get some rest.”

Mary’s tinkling laugh faded as sleep overtook her.