Twilight Sparkle nervously toyed with her mane as she walked down the long hallway towards the throne room in Canterlot. She was always a little apprehensive about meeting the princesses, but today was going to be different.

Twilight kept telling herself that everything would be alright. She had studied. She had prepared. It was what she had been training for ever since she was old enough. Her racing pulse, her tense nerves, and the butterflies in her stomach the size of griffons begged to differ.

The guards along the hallway turned their eyes up to the twelve-foot-tall unicorn as she passed by them. Twilight’s throbbing member always got where she was walking a few steps ahead of her. Nothing new to Twilight; it had been years since she had gone for long without an erection. Her hefty balls gently rubbed against her thighs as she walked, still feeling full despite Twilight’s best efforts at stress relief earlier that morning. Her near-infinite capacity as a hyper meant it would take far more to drain them than a simple rub of her cock. She’d convinced herself that it worked right up until the first moment she walked into the castle.

The last two guards stood at attention as Twilight approached the throne room, stopping in front of the massive double doors. She put her hand to her collarbone, inhaled, then slowly exhaled. Just like Cadance had always taught her to calm down.

Then Twilight did it again. And again. And again. It wasn’t helping.

“Milady Sparkle…” said the guard to Twilight’s left. “If you’re nervous about your test, I’m sure the princesses can afford a little more time.”

“Nervous?” said Twilight, instinctively grabbing the base of her thick meat, causing her tip to flare. “Who’s nervous? Why would I be nervous? I mean, it’s only the biggest exam of my life! The princesses have only been training me for it personally! It’s only to gain the title of Princess of the Sexual Equestrian Kingdom State! It’s only with Celestia and Luna, the two most beautiful and most powerful ponies in the entire world! Why would I be nervous?!”

Tower Shield was too well-trained to let her laughter escape. She was just about to comment when loud hoofsteps began trotting around the corner.

“You should be nervous, Sparkle. You have some very rough competition.”

Twilight rolled her eyes as Sunset Shimmer came into view. Similar to Twilight, Sunset towered over the average pony at twelve feet tall, her own thick cock throbbing as small shots of her cum leaked down her shaft in an unending flow. Her titanic breasts jiggled pleasantly as she came to a stop, a testament to how soft they were.

“And good morning to you too, Sunset…” Twilight said, her barbs hardly hidden as her hands rested on her own hips.

“Oh, changed your tone all of a sudden? Well, fine. It doesn’t matter whether you’re nervous or not, actually. I’m going to be the one crowned Princess today. Though I will admit that you’ll make a fine royal cock sock once I win. That booty of yours has always been a perfect fit…” Sunset gently patted her meat, giving it a few tender, loving rubs, the flow of her cum delicately increasing.

Twilight’s tail swayed gently across her massive purple ass. She knew that Sunset was going to push her advantage in the tits department, but Luna always had an eye for huge butts, which Twilight still outclassed Sunset in.

“And I thought you would have paid more attention to those big tits of yours,” said Twilight, staring intently at a particularly blank spot on the far wall. “Yet here you are, so eager to start that you’ve already got yourself in orgasm.”

“My tits are magnificent, Sparkle. Certainly more than the bee stings you call boobs. But I’ve finally become the total package that Celestia wants,” said Sunset, wearing her usual confident smile. “I’ve been cumming the last twenty-four hours straight to prepare for her.”

Twilight’s arms crossed over her hefty bosom, turning her attention more towards her rival. “First of all, my final project last year involved cumming for two weeks straight, you’ll recall. Forgive me if I withhold my enthusiasm for your achievement. And second, if you’re gushing before we even walk in the door, what makes you think you’ll maintain control once the exam actually starts?”

“See, that right there’s why you’re going to lose, Sparkle. No imagination. I maintained my flow despite all my preparation for the exam! If I can concentrate this much when I study, just imagine how dangerous I’m going to be on the test!”

Twilight scoffed, but the barbs still found their mark. The butterflies in Twilight's stomach stirred again.

A tense moment of silence was broken by Tower Shield, trying to be professional. “Good morning, Lady Shimmer.”

Sunset turned her attention towards the guard with a sneer. “Did you not hear me just a second ago? I’m going to become Princess today! So start calling me ‘Princess Sunset Shimmer,’ as of right now. I’d like to get used to the idea.”

“But, my lady, as powerful a hyper as you are, you’re not a princess yet. I’m sure you’ll be a fine ruler one day, but-”

Tower Shield was cut off by a sudden blast of cum to the face, Sunset’s cock gushing a wave of her potent seed over the guard.

“Sunset!” Twilight shouted. Her horn glowed, trying to cast a spell to stop Sunset, but the flow had already gone back down. Too late; Tower Shield’s moans were already growing, dropping her spear and tugging on her armor. She threw off her helmet and tugged at her breastplate with increasing lustful fury, grunting in sudden intense passion.

“What?” said Sunset incredulously, her cock back to only lightly gushing. “She wasn’t showing respect to her superiors! And besides, she’s lucky that all I’m doing is turning her into a helpless bimbo!”

“I think you misunderstand how a hyper is supposed to use their powers…” said Twilight with an annoyed grunt, looking down at the guard. Tower Shield’s armor was even affected by Sunset’s cum, going from clanking and firm to starting to jiggle and bounce with her breasts. A good thing, too, as Tower’s tits were growing rapidly. Her ass swelled out behind her, her grunting giving way to shouts of pleasure as her nethers began to gush on their own. Tower’s fingers dove into her pussy, the flow of honey across the carpet more than doubling.

“UNNH! Fuck me! Somepony, please, fuck me! FUCK ME!” screamed Tower Shield as Twilight looked over the intensely horny guard. It was unfortunate, but that was the power of a hyper. Her purple cock throbbed as she watched Tower Shield beg for somepony in intense lust, Twilight just taking a step away and pretending to not see her.

Sunset, meanwhile, looked very pleased with herself. “Ha. You’re lecturing me about turning ponies into helpless sluts? That’s a laugh, Sparkle. Tell me, is Moondancer still working to overcome those daily ‘cravings’ she has thanks to you?”

Twilight tried not to think about what she’d done before learning how to control her power, calming herself down. She and Sunset had ridden each other’s cocks many times before, and Twilight had never turned so mindless as Tower Shield was right now. Or as slutty as Moondancer had become the first time she’d gotten even a taste of Twilight’s seed.

Seeing as how hiding her nerves was useless now, Twilight inhaled sharply through her nose and stood at attention in front of the door.

“It’s going to take a lot more than that to break me, Sunset,” said Twilight. “I’ve been studying just as hard as you. And once I become Princess, you’ll be using your powers for good, instead of turning everyone who badmouths you into a slut.”

Sunset smirked, seeing the nervousness trickle into Twilight’s words. “Oh, don’t you worry your pretty little head, Sparkle. It won’t just be on the ponies who badmouth me.”

Before Twilight could counter with something else, the doors began to creak open on their own. Slowly, the passageway revealed a small entry to the throne room, just large enough for one of them to fit through at a time.

Sunset wasted no time in taking the lead, walking forward and giving her ass a shake at Twilight. “Hope you’re ready to lose!” said Sunset, her cocky smirk growing into a confident smile as she strolled into the throne room, dripping more loads of her cum onto the carpet.

Twilight gulped. She clutched a gentle hold of her own cock, then slowly strode in behind Sunset. Just as Twilight walked through the doors, they slowly slid to a close, leaving only the helplessly horny form of Tower Shield behind. Soft cries of “please” and “need it” permeated the otherwise quiet hallway as the guard kept helplessly cumming.

Even having seen the throne room countless times, Twilight was still impressed by its lavish beauty. The red silk and velvet pillows strewn across the room added a pleasant color to the already incredible bodies of the princesses. Celestia and Luna laid across couches at the far end of the throne room, the soft scent of vanilla permeating the air around them. Even jewels strewn about the curtains seemed oddly appropriate for such perfection.

Sitting up slowly on her throne, Celestia’s shimmering mane waved in a persistent flow. Her body wasn’t laced with any clothing, but the gold that adorned her ears, wrists, fingers, and the crown upon her head said more than enough. Her sister Luna laid next to her, covered in much the same, except in silver. Small necklaces hung around each of their necks, holding a symbol of the sun and the moon that rested on their collarbones, just above each beautiful pair of breasts.

“There you are, Sunset,” came Celestia’s smooth, sultry voice as the unicorn approached the two sisters. “Eager to start your exams, I see?”

Sunset puffed up her ample chest, her soft breasts jiggling before the sun goddess. “Eager to get crowned princess!”

Twilight walked in behind Sunset, stopping to her right, standing more submissively, partially drawn into herself. The butterflies in her stomach violently fluttered as Luna began to sit up on her padded throne. Even the way the moon princess sat up was so utterly beautiful that Twilight’s eyes were transfixed.

“And there is the lovely Twilight Sparkle, as tantalizing as ever,” said Luna, standing up from her throne. At sixteen feet tall, she and her sister towered over everypony else in their kingdom, even their faithful and beloved students. Luna’s breasts softly bounced with an enticing sway as she walked closer to Twilight.

The little ways that Luna moved her hips, flexed her legs, even puffed out her chest just oozed sexuality. Everything about her body language told volumes about how confident, powerful, and sexy this mare was. Even Sunset was staring at Luna as she walked towards Twilight, who was feeling her lust rapidly build for her princess. And all Luna was doing was walking!

Twilight couldn’t take it. Her cock throbbed for a moment before she gently began to cum.

Sunset’s smirk returned. “Well, now who’s lacking self-control, Sparkle?”

“Shut up, Sunset… “ Twilight said with a wince. She maintained her composure by taking in a slow breath through her nose, even as she allowed her cock to keep cumming. There was no point in stopping it now, especially not with Luna getting close.

Luna leaned down towards both students, rubbing their shafts with her soft delicate hands. Twilight and Sunset both gently moaned as Luna rubbed, their flows briefly increasing with their seed pouring across Luna’s hands, and soon enough, her chest. Luna smirked as she saw Twilight and Sunset keep both their eyes open, their hungry eyes staring at her coated breasts. A few more delicate rubs were all Luna gave the two huge cocks, slowly stepping backwards. Luna’s horn glowed as her perfect body was clean of their cum in an instant.

“I would say these two are suitably prepared for the examination, Tia,” said Luna, even though she kept her eyes closer to Twilight. Sunset was about to make another snide comment when she felt another soft hand grab her butt from behind. Then came a small grunt from Twilight, who got much the same from Princess Celestia.

“I don’t know, Lulu. They do seem to be rather easily distracted…” The gentle kneading and caressing of Celestia’s soft hands was enough to make both unicorns stifle further low moans. Their cocks each throbbed, growing a few inches, their flows increasing from a steady drip to a small stream in a constant leak.

Luna chuckled to herself as she slid back onto the velvet throne. Celestia walked between the two horny students, standing at the head of her sister’s throne, her hand instinctively running through Luna’s starry mane. Twilight and Sunset managed to open one eye apiece, managing to keep their focus despite themselves. Just as they’d been trained to do.

“Now then, my sweet girls,” said Celestia, “It’s time we get to the meat of this exam.” The obvious innuendo made Sunset’s eyes almost roll out of her head.

“You’ve spent countless hours with your fellow students, your peers, and your friends, mastering your sexual power, and becoming two of the most beautiful students to ever grace these halls,” Celestia continued, a soft blush coming to Twilight’s face from her praise. “I’ve seen you two flood hallways, grow past your limits, milk each other for days, and turn the most celibate of ponies into the most mindless of sluts.”

Celestia’s lips curled into a smirk. “And with that in mind… There is only one real test you two have left to overcome.”

A hard spurt was enough to send Twilight’s mind out of focus for a moment, leaving Sunset to speak up. “And what’s that? What could I… er, we possibly do that hasn’t already been done? We’re the most powerful hypers in all of Canterlot!”

Celestia took a few steps towards Sunset. Luna turned back around from her throne, walking slowly towards Twilight. As the princesses approached, their balls visibly swelled and the immense cocks that rested beneath stood at attention. Twilight’s eyes opened as she saw the princesses walking.

Luna was the first to speak up. “Not quite the most powerful, Sunset Shimmer.”

The two genius-level students deciphered the meaning quickly. In an instant, the confidence that had been written all across Sunset’s face vanished. Sunset had clasped the base of her cock with both hands, another gush staining the throne before her. Twilight’s eyes grew wide, almost choking on her air. Her thick purple cock jerked as she kept her eyes on Luna, who sensually strode behind her.

“P-Princess Luna,” said Twilight, staying perfectly still, only her eyes watching Luna’s movements. “You can’t mean…”

Twilight was cut off by a sudden spank. Luna’s large blue hands clasped around her marshmallow soft booty. To their left, Celestia had grabbed Sunset by her huge pillowy tits, lifting her up to her level. Sunset winced, looking up at the huge alicorn, feeling Celestia’s own huge breasts pushing into her back.

“Lost your nerve?” said Luna, her thick member growing even faster than Twilight’s. “If you can’t handle the absolute best in the Sexual Equestrian Kingdom State, then you won’t be fit to be a princess.” Another grab to the plump ass of Twilight barely even registered as Twilight grew more nervous at the prospect of this coming exam.

Celestia and Luna’s dicks had been plunged into many a being across the millennia of their rule. Neither of the Two Sisters could even begin to recite the names of all the ponies that they’d plunged, pounded, and inflated with the size of their immense loads. Twilight could name ten random ancient, mythical figures of Equestria off the top of her head, and smart money that the Sisters had carnal knowledge of all ten of them.

Which is why Twilight’s body tensed with all her might the instant she felt the top of Luna’s cock touch against her ass. Already, Twilight was wondering how impossibly she was going to be stretched. Sunset had stretched her plenty of times, but nothing like what she’d read of Luna doing. Even as it grew, Twilight could feel the raw power behind Luna’s cock. Even the steady flow Twilight was already leaking was going to be a drop in the bucket compared to her loads.

Sunset wasn’t far behind. She was putting on as brave a face as she could, but Celestia’s dick was already in prime position for Sunset’s dripping wet pussy. She saw the golden glow of Celestia’s horn over her shoulder, the strong soft hands of the princess kneading into Sunset’s ample chest. She could already feel her breasts beginning to grow under Celestia’s spell, though she didn’t dare resist.

The goddesses grinned as they leered over their students. It was Celestia who spoke before the exam truly began.

“Now, faithful students, you both have earned a very rare privilege: witnessing the full power of the Two Sisters!”

The powerful cock of Celestia pushed its way into Sunset’s folds as her tits began rapidly growing under the spell of the sun goddess. Twilight’s plump purple ass gave way as Luna’s dick pounded its way in, a ferocious heat surging through Twilight’s body.

In an instant, the two students began to scream with lust. Sunset’s flow of cum went from a steady drip to a firehose, spraying the thrones in front of her in a thick white. Twilight’s cock surged in size as she felt Luna pump into her magnificent ass, gushing cum so hard that she would swear she’d hit Cloudsdale. Her seed rained down on the stained glass windows behind the throne, somehow avoiding shattering them with the cannonball-like force behind her orgasm.

Celestia’s magic poured through Sunset’s body, who watched as her breasts swelled, bigger and bigger, larger than her head and still increasing. As she poured her cum from her massive cock, Sunset’s senses finally returned. This was a test, and there was no way in Tartarus that Twilight Sparkle was going to be a better hyper than her! She turned her cock towards Celestia’s throne, favoring it over Luna’s as she coated the velvet couch in her spunk.

Celestia chuckled to herself, releasing Sunset’s breasts from her spell. They bounced and jiggled in an endless dance across her chest, big enough to titfuck herself. That brought Celestia back to the third year of Advanced Hyper Studies where Sunset had done just that, swallowing so much of her own load that her stomach swelled… A brief but blissful nostalgic thought. And one that gave Celestia an idea, her horn sparking again as her hands kneaded into the massive mounds, letting her own royal scepter grow further inside of her student.

“My word, Sunset. You certainly are devoted to your studies, aren’t you? Even for the advanced classes, your power is incredible…”

Sunset grinned, her eyes partially opening as she heard Celestia’s praise. It was more than enough to set Sunset’s focus back on the right path, even as Celestia’s cock began to stretch out Sunset. For all of the worry she’d had when she heard of Celestia’s full power, Sunset was keeping herself relatively under control.

“N-Nngh… Of course, Princess! It’s nothing for me! In fact, through the rest of this exam, I’ll show you I’m way more devoted than- anh! Aaah! AAH! AAAAAAH~!”

A second cock suddenly jutted from Sunset’s hips, growing rapidly to match the size of her first, surrounded by Celestia’s magic. Her new cock began cumming instantly, her pussy clamping down on Celestia’s meat with a vice grip. What brief levels of confidence and control Sunset had were blasted away by Celestia’s show of dominance, with Sunset just trying to not give into her maddening lust.

Twilight’s eyes widened as she saw what Sunset was going through. Her gaze was interrupted when Luna turned Twilight’s head towards the throne, then slid her hands down the unicorn’s body to her hips. Twilight felt the distinctive sensual touch as Luna caressed around her hips.

“Now, now, Twilight Sparkle. Keep your focus on your own exam,” said Luna, whispering into her ear while the massaging hands of the goddess caressed her. “Are you concerned that Sunset Shimmer’s cocks will overpower your own?”

Twilight gulped, glancing over again. It was impossible not to compare. And it didn’t look good for her. Twilight’s dick had only just grown past the tip of her horn, whereas both of Sunset’s cocks were at least an arms-length longer. And, naturally, twice the cocks meant twice the cum. Sunset and Twilight were gushing so heavily that the floor of the throne room was starting to be coated in a thin layer of seed, yet Twilight’s own flow was still less than half of Sunset’s.

“Nnngh… y-you’re right. I have to… I have to focus…!” Twilight’s hands gripped as low as she could on her huge cock, grabbing and jerking herself suddenly. The shaft began growing again, swelling in size as she pulled it towards her chest.

Then, in a display that many who might have seen her thought insane, began to push backwards.

Luna was hardly one to protest as Twilight slid further down her cock, pushing that ass that she’d used so well further and further down the immense shaft. Twilight’s legs wobbled beneath her, fighting down for every inch of the shaft. Her pussy was leaking with her intense heat as she grunted, sweat rolling down her forehead, her cum flow pouring onto the floor like cream.

Her teacher wasn’t far behind. Twilight felt Luna’s cock flare deep inside of her, a leaked few gallons of pre-cum pouring into Twilight, her belly suddenly, albeit slightly, swollen from the size of Luna’s momentary lapse in control. Luna’s fat balls grew as well, sliding across her legs as the princess grabbed Twilight’s hips, helping her down another few inches.

“Ooh! Twilight Sparkle! You’ve taken your studies to heart after all!” shouted Luna, the scent of her sweet musk managing to reach Twilight’s nose, in spite of the layer of cum flowing over the floor. Luna’s horn glowed with a bright blue aura as she suddenly latched her hands onto Twilight’s dick from behind.

“Then you will surely appreciate quality over quantity!”

The magic flowed into Twilight’s cock from Luna’s soft hands, accelerating its growth explosively. It was Twilight’s turn to scream in lustful bliss as her shaft rapidly reached the size of Sunset’s pricks, and growing further still. Her cumming increased just as much, a steady flow of cream becoming a deluge of thick seed. Her balls swelled until they reached the floor, her own loads coating around the titanic sack, her heat building within despite her massive release.

It was all Twilight could do to keep herself from completely losing herself to this lust and plowing anyone in front of her until it subsided, whenever in the next decade that might have been. Sunset’s tits bobbed and bounced as both of her immense cocks poured over everything in the throne room, the wall behind the throne covered in her sticky paste. Both of them weren’t at their breaking points yet, but each of them knew that their near-infinite levels of seed would find a way to be properly drained before the exam was over.

Then, a rather ominous sound filled the ears of Twilight and Sunset. Over all of the lustful screams to the heavens, the twitching marehoods, the unending rivers of cum and the wet sloshing of their mixed flows across the floor, they both heard it.

It shouldn’t have been so scary. And yet it was. They both heard it. They saw it on each other clear as day. They both saw the dread in the other’s eyes. They saw the sweat pouring down the other’s pretty face.

Celestia’s soft chuckling echoed through the room. Luna’s smirk betrayed her own amusement.

“Enjoying yourselves, girls?” said Celestia, her voice oozing with succulent malice. “I hope you’re not too worn out. That was the easy part of the test.”

Twilight’s stomach dropped. “T-The easy part?!” she shouted.

Sunset’s throat clamped close, refusing to open to let her speak. She thought she had seen the limits of Celestia’s power. Sunset had cum more in a few minutes than the average pony did in an entire lifetime. And that was the easy part?

A firm white hand grabbed each of Sunset’s two cocks with blinding speed. The grip was so suddenly intense that her flow came to a near instant stop. Even Twilight, whose cock had grown larger than her own body, felt her valves close the moment Luna held onto her shaft.

“My cum!” shouted Sunset. “B-But that’s… That’s impossible!"

“Hardly, Sunset Shimmer,” said Luna as Sunset and Twilight were lurched forward. Celestia and Luna picked them up off the ground, driving them further down their cocks with their divine strength. Both students’ cocks swelled at their bases, still refusing to unleash the torrential loads contained within.

The horns of the two sisters began to glow. Celestia slowly licked her lips.

“Now for the hard part.”

Author's Note

Testing the proverbial waters with this one.