Keys to the Kingdom

Princess Celestia started off slow with Sunset Shimmer. A few thrusts of an inch or two inside of Sunset’s wet pussy while keeping her hands clamped on the twin cocks were enough to cause Sunset’s balls to start swelling into further hugeness. All the while, a small smirk stayed etched across Celestia’s beautiful face. It had been ages since anypony besides her sister had felt her full power.

“Nngh! P-Princess! UNH! Princess!” shouted Sunset. Even though the floor and thrones were already covered in cum, Sunset felt Celestia’s grip holding back her flow. She desperately bucked both of her cocks, hoping, praying, pleading that Celestia would let even a drop of it through. Sunset’s balls swelled, fast. That near-infinite seed had to go somewhere.

Luna took a different approach, gripping onto Twilight’s hips and plowing that plump marshmallow ass with her immense strength. A bit more every time, Luna’s powerful cock drove its way into Twilight without mercy. Every thrust made Luna’s dick swell just a bit more. Every thrust of that cock was more powerful than the last. Every pump made her own cock surge higher than the last. Twilight was sweating profusely, just trying to hold on. A daunting task with Luna holding her off of the ground, titanic house-sized cock and all.

Twilight’s heavy nuts were still on the floor. She was sure they were the biggest they’d ever been. Maybe except for that one time when Sunset had pranked her with the cum-doubling spell... In a few moments, it wasn’t going to matter. Twilight felt Luna’s own cum almost bubbling just underneath the surface of her cock, ready to be fired out like a shot from a cannon.

“Ooh, Twilight Sparkle!” said Luna with another spank and a fierce grab of a handful of purple booty. “You feel so deep! A truly wonderful hyper, indeed! But… We see you still trailing far behind Sunset Shimmer where your tits are concerned.”

Twilight pried an eye open to look at her rival, plunged on Celestia. Sunset was starting to slip through the cracks, grabbing one of her cocks in her hands, rubbing and twisting with a ferocity that Sunset had only shown a few times before. Her cocks had both grown well past her head, but nothing compared to the titan bobbing and pulsing in front of Twilight.

Celestia’s cock was pumping with speed beyond most mortals. She was lifting Sunset from the cum-covered floor with her godly strength, pumping at such an angle to make Sunset’s balls swell towards the thrones. Throughout it all, Celestia retained the pleasant, confident smirk on her face, which only further unnerved Twilight.

Just as Celestia leaned in to whisper something to Sunset, Twilight’s attentions were forced back to Luna by another seismic slam into her tight ass. Twilight’s mind became so suddenly fogged with lust and adrenaline, she hardly registered it as her body violently respond with a thrust of her own. Her cock surged in size so hard that the tip slammed against the high ceiling.

“UNNH! G-GH! C-Can’t… Can’t stop iiiit!” Twilight shouted.

The pressure built up fast. Twilight could still feel her cock trying to grow against the ceiling, sending shivers through her much smaller frame down below. The only thing preventing Twilight from bursting through was what little sense of self-control she had left. Even in the years upon years she’d studied the finer points of hyperdom, Twilight’s dick had never been this big. The entire room rumbled as the involuntary thrust of her hips pushed the towering cock upward, though any one of her thrusts might break through. She thrashed as much as she could on Luna’s dick, still stretching her out more and more.

Luna’s free hand gently squeezed one of Twilight’s tits, leaning over her neck and licking across her cheek. “Do not fret, my young apprentice. We will see to it that your tits are spoken of with reverence…”

“NNNGH! AAAANH~!” shouted Sunset in a lewd plea. “Please! PLEASE let me cum, Princess! My goddess! My MISTRESS!” she pleaded again as the holy monolith of Celestia pounded her with a power and speed greater than anyone ever had before. Between her and Twilight, the incredible growth of their sacks was threatening to fill up the throne room.

Celestia grinned, a momentary shiver giving away her real feelings. Even as she forcefully, exquisitely rammed Sunset’s pussy like a jackhammer, she was a picture of grace and elegance. “Oh, my dear sweet student, Sunset… your release will be legendary.” Celestia kept a tight grip on both of Sunset’s throbbing members, leaning in to whisper again. “You will release only when you promise me that you will drain those heavy balls. Even if that means washing away Canterlot in a tidal wave. You will only release when you can prove to me that you are a hyper of the highest caliber. You will take what is yours, and hold nothing back. Nothing. Do you understand?”

“Yeeeeeeees!” cried Sunset, unable to do anything but scream. “I’ll make every last mare and colt ride my cocks! I’ll flood the whole fucking world for you! I swear I will I swear upon the sun and the moon and the huge perfect tits of my goddess oh goddess sweet mistress just please please please PLEASE PLEASE PLEASE LET ME CUUUUUM!”

Celestia only kept smirking, glancing over at Luna. Both of Twilight’s eyes were closed, audible cracks in the wood echoing across the throne room like fireworks as her towering cock kept trying to break through it. Any second, Twilight knew she was going to lose this fight. Luna’s massive meat just felt too good to contain it.

All of a sudden, a spurt of several gallons of cum gushed inside Twilight. The sudden jolt should have made her belly balloon in size, but she felt a heavy weight on her chest instead. She audibly gasped in between her cries of lust, feeling her tits swell as Luna came. The few synapses in Twilight’s brain that weren’t screaming at her to plow through the roof knew there was no such thing as “too big” for the most accomplished of hypers. But between her monolithic cock, her intensely swelling balls, and now her tits growing at Luna’s will, she was beginning to understand what it really meant.

“But first!” cried Luna, one last intense grip at the base of Twilight’s cock making it break through the support beams. “Show them all the power of a princess! Show them why you deserve to be called a GOD!”

At once, Celestia and Luna let go.

Twilight and Sunset’s screams echoed to the heavens.

A flood instantly blasted from Sunset’s twin cannons. It broke through the throne room’s doors, a massive wave surging through with the force of a tsunami. The helpless Tower Shield and her fellow guardponies were swept away as the halls were filled with Sunset’s cum in mere moments. Even at the lower floors, the scent of Sunset was so intense that ponies grunted and tore their clothes off. It wouldn’t be long before the wave after wave after wave of cum cascaded down to them.

Those on the higher floors fared no better. As Twilight’s monstrous cock added another tower to the castle, her cum shot into the sky and rained back down across the grounds. Foot after foot, yard after yard of Twilight’s dick kept growing out of the hole in the roof, crashing through with each thrust. The guards and guests outside were splattered, their surprise quickly giving way to unbridled lust as Twilight’s potent seed flooded their senses.

The throne room itself was once again flooded as Sunset and Twilight’s cum coated everything. The earth-shaking rumbles of their balls trying to desperately empty shook the floor. Sunset wasn’t controlling herself, as her mistress wanted. The force of her twin dicks blasting out her sticky cum forced her back against Celestia, who was all too happy to plunge deep inside of Sunset’s overtaxed pussy. Twilight’s single titan of a cock was spraying so intensely that the castle was already getting coated.

“Aaaanh! NNNGH! F-FUUUUCK!” cried Sunset, thrashing her body on Celestia’s divine dick.

“That’s it, my faithful student! Don’t let up for an instant!” said Celestia, letting her passions finally break through as she plowed Sunset’s tight pussy mercilessly. As she pounded, the holy balls of the sun goddess finally graced Sunset with their blessing. Celestia’s seed finally began to flow inside of Sunset, the pure unbridled heat of it all making Sunset sweat even harder. She was turning into a filthy, sticky mess, and she loved it.

Luna drew back her cock, grabbing onto Twilight’s ass again with that firm grip before plowing inside of the purple booty one more time. Twilight could feel another spurt of Luna’s cum. Then another. Then another. Then another. Luna was moaning openly, her horn sparking with her magic as the balls of the goddess finally let loose. Despite cumming infinitely harder than the princess, Twilight’s tits swelled into further hugeness, pressing against the titanic cock in front of her and swelling rapidly.

Somewhere, deep in the back of Twilight’s mind, she wondered how she might escape. This pleasure was rocking her down to her very core. Her tits were still growing bigger from Luna’s magic, and they showed no signs of stopping. Those titanic boobs were pushing against her monstrous cock so hard that, any moment, they’d slide around her shaft and she’d be titfucking herself.

But then... why fight it at all, she thought? Maybe… Maybe Twilight didn’t have to escape it.

Sweet Celestia’s tits, it all felt so good. Like she could just pass out and let her consciousness drift away as Luna’s toy. She’d never stop spraying. And that blessing of a cock could coat all of Equus in cum. Every pony, dragon and griffin would be mindless in their passions. All of them would be bowing to Twilight. Bowing to Luna. They’d all be so horny that the entire planet could be one giant orgy nonstop.

It could all be glorious… All she had to do was let go…

A small voice in Twilight’s mind suddenly shouted. “No! NO! This isn’t me! I don’t turn ponies into sluts! I want to be a princess who loves her subjects, not controls them! Nngh, but it’s so hard to think… I can’t stop cumming! Got to… got to… fight it!”

Luna’s cock wasn’t making things any easier for Twilight. And with Luna’s centuries of experience, there was no doubt that she’d only stop cumming when she wanted to. Twilight was still swelling, still watching that titanic cock of her own spray across the castle. Sunset’s twin marehoods weren’t far behind, the throne room’s floor hidden beneath a river of whiteness as the cum flowed from the castle into the streets of Canterlot.

Gritting her teeth against the pleasure, the small voice in Twilight’s head fought against the raging torrent of lust that was flooding her mind. Her horn began to glow softly at first, but soon, it began lighting up the room. Twilight’s monstrous cock shuddered as she tried to cast a shrinking spell on herself in an attempt to stem the tide. But, no matter how much of her power she pumped in, her cock just wouldn’t stop.

A soft chuckle came from behind Twilight as Luna gave her ass a prompt spank. “Oh sweetest Twilight Sparkle, you’re going to have to be a little more creative than that.” Twilight felt Luna’s cumflow increase, even more of the divine seed pumping into her as punishment.

“AAAAH! YES YES YES YES YEEEES P-PRINCEEEEEESS~!” Twilight screamed again, her horn violently sparking with magic.

Across the room, Sunset appeared to be showing some signs of struggle as well, sweat pouring down her pretty face as she clenched her pussy, trying to slow Celestia down. Her hefty nuts were still nowhere close to empty. Sunset had realized that cumming nonstop like this could mean weeks before she emptied, and that was if Celestia allowed it. Sunset couldn’t have that. Nopony bested her. Not even her princess.

It was Sunset’s horn that glowed next, Celestia’s balls feeling a distinct tingle as Sunset’s magic enveloped them. The princess smirked, licking Sunset’s neck with a slow drag. “And just what do you think you’re doing?”

Twilght, in her haze, wondered the same thing. Coating the balls of an alicorn in magic? What was Sunset planning? Was she trying to prevent Celestia from cumming? Such a thing would be impossible, given the difference in their power…

Suddenly, the idea struck Twilight like a thunderbolt. That was it! Power! She and Sunset were at the top of their class, and even they paled in comparison to their princesses. Twilight needed power to stop herself from cumming into complete submission.

And Twilight had her source. Sunset had her source. That was what they needed. They’d told them right from the start. The full power of the Two Sisters.

The idea was completely insane. If Twilight couldn’t pull it off, she knew that she would only be sending herself into lustful madness even faster. If Twilight slipped, even for a moment, she really would be nothing but a royal cocksock.

It was risky. But it was the only way.

Twilight’s magic violently jolted from her horn, enveloping Luna’s cock in a pale purple aura. Luna chuckled, just about to comment before she felt a distinct pull on her balls. The flow of cum into her student suddenly increased, causing Luna to suddenly slam forward, dropping Twilight and grabbing onto her hips.

“NGH! Twilight Sparkle, what is this meaning of THIIIIIS?!” It was Luna’s turn to shout as her gushing spiked. Her loads were more than twice as big as a moment ago, a constant stream of divine spunk pouring into Twilight. The princess had expected her student to try and stop her endless orgasm; instead, she was increasing it. That brief moment of surprise had let Twilight’s magic overtake Luna’s mastery of her cock.

Across the throne room, Sunset had begun casting and recasting an instant orgasm spell on Celestia. As much magic as she poured into her spell, it still wasn’t working. Celestia was just too strong, and too experienced. Sunset must have overestimated her own talents.

Celestia’s hands kneaded into Sunset’s breasts. “Oh, Sunset. I know you want to pleasure your mistress, but you’re just not strong enough. Maybe if you’d only- NNGH!”

Celestia’s pussy suddenly clenched as she felt her honey run down her legs. Sunset’s spell had simply changed direction. In the ensuing moment, Sunset took advantage to clench down as tight as she could on Celestia, who was cumming harder than ever.

The horns of Twilight and Sunset glowed ever brighter. The divine cum pumping into them in literal waves was still forcing them to dig deep just to stay in control, as their own marehoods were still gushing uncontrollably. Now was the real test. Drawing from that divine power source for their magic.

Twilight was the first to strike. Her horn filled the room with an eldritch purple light, drawing on the power from Luna’s cum to make herself resist. She could already feel the oceans of cum bubbling inside of her sack start to subside, her cock’s intense growth finally coming to a stop, most of the roof of the throne room now gone from her sheer size.

The sprays of cum into Canterlot were still endlessly flowing as the two students gushed. Only the select few pegasi guards who had made it into the air were spared the instantaneous change into a horny mob scene in the castle. Tower Shield, in particular, had been swept out to the castle gardens by Sunset’s first wave, grabbing a random stallion and plunging herself onto his cock with a furious need. He didn’t seem to mind, the way he had pinned her to the grass and pounded her tight pussy with his own maddened lust clouding his thoughts.

Inside the throne room, Celestia and Luna’s brief lapse in control was turning into a struggle. As much as the two of them were gushing, Sunset and Twilight weren’t getting any bigger. In fact, Luna saw, to her amazement, that Twilight’s bust and cock were actually getting smaller. Twilight’s horn was not only glowing as bright as a flare, but her eyes had begun to glow with the same light. Her huge purple ass grabbed onto Luna’s cock and pulled, and pulled, and pulled until Luna found herself buried as deep as she’d ever been in anypony. Luna grabbed onto Twilight’s ass with her alicorn might and pulled back, but she could hardly budge her cock. All the while, her gushing was getting more intense, fueling Twilight’s power.

“T-Twi! Light! UNH! Sparkle! Y-You! UNNNNH! More! MORE!” Luna shouted, her royal voice echoing across the castle grounds.

Sunset’s face had regained the confident smirk she was accustomed to wearing as she heard Celestia’s passioned cries. Her fervent cries and grunts through gritted teeth made Sunset knew just how close she was coming to overpowering this goddess.

The ethereal light that had spread over Twilight’s horn began to envelope the rest of her body. Twilight’s sexy frame shone with a brilliant light as Luna’s cock was driven to cumming harder than she’d cum in the past century. Luna screamed with passion as she felt herself gushing what must have been lakes of cum at a time, yet she couldn’t so much as tug herself an inch away from Twilight.

“Aaah! I-I can’t stop her! UNGH!”

Sunset’s body began to glow from within, a white light spreading from her stomach towards the rest of her powerful frame as both of her cocks came down to the tip of her horn. Pulses of power pumped through her frame as she greedily fed on the holy power of Celestia, and every pulse felt like another orgasm was rocking through Celestia’s dick.

Then, they all saw it. Twilight and Sunset, clear as day, were growing.

Twilight grew in a slow and steady wave, her horn getting longer. Sunset’s body grew in pulses, inches at a time. Their voices echoed like a heavenly choir. What anyone could see of their bodies was beautiful beyond mere words. Their light grew brighter and brighter, glowing hotter than the sun.

It felt incredible. This was beyond any mere orgasm. This was beyond the sensations of sharing such a miraculous release with their beloved teachers. This transcended everything they’d done in their studies as hypers. It was a sensation that pierced straight into their souls. It was unlike anything in heaven and earth. Their cries of pleasure couldn’t do it justice.

There were no other words.

It was divine.

Celestia and Luna, through their sweating and helplessly intense release, looked up to see Sunset and Twilight’s bodies transform. Giant wings fanned out from each of their backs, the tips of their horns sparkling like diamonds.

The light began to fade, and their eyes adjusted as it slowly dimmed.

Twilight and Sunset had each grown to a perfect sixteen feet tall. Twilight’s mountainous purple ass was jiggling harder than ever, her tits swollen to Sunset’s level of beauty. Her cock had throbbed up to the tip of her horn, and her balls were nearly to her knees.

Sunset retained both of her cocks, the tool that Celestia added still gushing its loads while her tits bounced from their softness. Her clenched pussy was still milking Celestia for all it was worth, but she could feel the clouding fog in her mind rapidly lifting away.

Twilight turned to inspect her fellow student. Sunset turned to gloat to her rival. Their eyes laid upon the other. When they did, they went from half-lidded glances to wide-eyed stares. A moment of heavy silence hung in the air.

“Sunset!” said Twilight, the first to speak up among the four. “You’ve got wings!?”

“I’ve got wings!?” Sunset snapped back. “How in Tartarus did you get wings?!”

Twilight looked behind her. A soft flap of her light feathery wings said all they needed to say. Her plan, crazy as it was, had worked better than she could have ever anticipated.

“We’re… alicorns?”

It was a soft grab from below that finally drew their attentions away. The flow of Twilight’s cum that had coated the entire castle had come to a stop. The rush of Sunset’s cum that had flooded the hallways had come to a stop. Below them both, the proud smiles of Celestia and Luna shone brightly.

“Congratulations, girls,” said Celestia, panting and coated in a thick layer of sweat. “The exam is over.”

Eight hours later, most of the guardsponies and castle staff had been cured of their rampant need by the magic of the princesses. And repairing a few destroyed roofs and doors was even easier, most of the mages’ court lending their horns for a speedy repair. As massive as it was, the titanic flood was being cleaned up quite quickly, even if those assigned to the clean-up did suffer a few ‘relapses.’

Twilight watched out the window overlooking the gardens from the guest bedroom. She fluttered her new wings, trying to get a sense of this shift in weight. Being four feet taller and growing several cup sizes wasn’t doing her many favors, but she’d dealt with massive shifts in weight before. At least she could find a way to control the size of her cock. Appealing as the thought sounded, having a cock that was big enough to block her vision just didn’t seem worth the trouble.

Behind Twilight, Sunset Shimmer stood with her hands on her hips, impatiently drumming her fingers, staring at the bedroom’s double doors. Both of her cocks were still hard, but she’d managed to stop cumming for the moment. It had to be harder than it looked. Two cocks meant twice the stimulation, Twilight had reasoned.

Still, there was a tension in the room as the two newly-ascended alicorns waited. Twilight turned from the window and slowly walked towards Sunset, awkwardly stopping a few feet behind her.

“Um… so, Sunset! Are you thinking about keeping that second cock?”

Sunset rolled her eyes as she turned to face Twilight. “Of course I’m going to keep it, Sparkle. It’s a graduation present from Celestia herself! Once Celestia and Luna walk in and tell me that I’m the one they’ve chosen, my first royal act will be having my portrait painted with them on display!”

Twilight felt the butterflies in her stomach flare up again. “How do you know that you’re the one they’re going to pick? I ascended, too!” she said while fanning out her wings, almost losing her balance.

“Because you copied my idea!” Sunset would have stormed at Twilight, if not for fear of falling over. She resorted to pointing at herself. “I was the one who thought to use the divine power in Celestia’s cum before you tried it with Luna!”

“But you were also submitting to Celestia’s domination,” Twilight fired back. “I was focusing on finding a way to cope with Luna’s cum the entire time while you were ready to call her your mistress! And besides, you turned a guard into a slut for no reason before we started! I’m the one who should be Princess!”

Sunset was just about to shout at Twilight again when a creak of the doors cut her off. Both of the girls stood awkwardly at attention as Celestia and Luna walked in, slowly closing the doors behind them. It was hard not to start gushing again as Twilight saw Luna’s sexy sway, but she managed to restrain herself. Barely.

Celestia was wearing a smile on her face. The only thing she usually wore. “Sunset Shimmer? Twilight Sparkle?”

They stood up straight, both of them having to lean forward again when they almost toppled over backwards from the weight of their wings.
“You’ll be glad to know that the clean-up is almost finished,” Celestia continued. “You shouldn’t have to worry about any long-term damages to the castle or the ponies inside of it.”

Another long moment of silence hung in the air. Twilight was too scared to talk, worried her voice would crack from her nerves, and then there’d be no hope for her.

Luna chuckled to herself. “But that is not what you want to hear us say. You want to know who we have chosen to become Princess of the Sexual Equestrian Kingdom State.”

Twilight bobbed her head once. Sunset nodded quickly.

“We had come to a decision while we were recovering from your exam,” said Celestia as the two princesses stepped forward. Celestia stood in front of Sunset, and Luna in front of Twilight, both of them clearing their throats. Twilight thought how odd it was that she was seeing the princesses eye-to-eye now, but the thought vanished in an instant as her heartbeat quickened.

“Sunset Shimmer? Twilight Sparkle? You both performed admirably during the exam today,” said Luna. “You both had your flaws, to be certain, but you overall did exactly what you had to do. It was the ultimate test of your abilities as a hyper, and you both managed to pass in your own unique ways.”

“However,” said Celestia, running a hand down Sunset’s arm, “your performances forced us to think long and hard about who we would want on the throne. You both have different mindsets, different skillsets, and different accomplishments from your time in your studies. And after some debate between the two of us, there was really only one decision we could make.”

Twilight swore she was sweating harder now than during the exam. She could feel her heart ready to beat straight out of her chest.

Luna clasped a hand on Twilight’s shoulder. “We have decided… that you will both ascend to becoming Princesses of Equestria!”

Sunset and Twilight almost collapsed.

“Both of us!?” said Sunset. “But, but I thought you only wanted one princess! Why did you change your minds?”

“Why?” said Celestia. “Because, in the millennia we’ve been ruling this world, there has been no one capable of doing what the two of you have done. Anyone else who has tried to best us, even try and contain us, has failed. And our own students managed to match us! Such a talent coming along once in our reign was thought to be rare enough. But twice at the same time? We simply couldn’t let such fine students like you go to waste!”

“And aside from that,” said Luna, holding onto Twilight’s shoulders, “you two will see the world from the top of the mountain! As alicorns and princesses, you will be immortal! You will learn how to become rulers of the day and of the night, not just as students, but as the hand-chosen successors to the crown!”

Twilight’s jaw hung open. Sunset tried to speak, but couldn’t do more than uselessly stammer.

Celestia and Luna gave each of their soft butts a playful swat. It didn’t register.

“Now then,” said Celestia, pulling away, “it’s been a trying day. Use this room and get some well-deserved rest. We will see you both in the morning… Princess Twilight Sparkle. Princess Sunset Shimmer.” The two sisters turned and left the room, the doors creaking to a close. Outside, the clanking of metal armor told them that guards had taken position in front of the doors.

Twilight and Sunset both stared at the closed door for what felt like hours. Slowly, they turned towards one another, mouths still agape.
Twilight’s brain was the first to wake up. They’d done it. Both of them. They were princesses. They would rule alongside their teachers as the most powerful and wise hypers in the kingdom. Forever.

As much as Twilight wanted to jump and scream in pure joy, she’d also realized that meant she’d have to spend an eternity with Sunset Shimmer.

“Well, fuck.”