Keys to the Kingdom

Rarity opened a large wooden closet with a smile on her face. Her trips to the castle these last few evenings had been like she’d pictured them when she’d first come to Canterlot; elegantly beautiful, lusciously vibrant, and spectacularly decadent. Perhaps with Celestia and Luna on vacation, the level of stress and worry had truly gone down for everypony.

Although Rarity had her own stresses to consider. Thoughts of ballrooms and next week’s formal festivities had been stirring in her head for months. What would she wear? It wasn’t every day that a celebration like Twilight’s four-hundredth year of rule came along.

“A nice purple and silver combination? No doubt it would send all the right messages if I matched it to Twilight’s coat! T’would be a lovely compliment, indeed.”

Rarity took a step backwards, enough to catch her image in a full-length mirror. She held her arms over her head, her horn glowing a soft blue as her dress slid smoothly away from her curved form, sliding onto a hook in the closet. Her pert white breasts and supple rear end each received a few soft pats as Rarity examined herself head to hoof.

“Although, ‘tis not everypony who looks this good naked,” Rarity chuckled as she adjusted her pendant tighter around her neck. The silver star charm at the front glowed a gentle purple as it was locked into place, her breasts swelling up a cup size before the glow faded.

“All these years, it still hadn’t lost its magic. I should expect no less from the great Twilight Sparkle! Now, enough dawdling. The princess needs her spirits kept aloft, and I am just the pony for the job!”

Rarity stepped from the servants’ quarters and strolled down the hallway towards the throne room wearing nothing but the high-class pendant around her neck. The sun had set moments ago, and Twilight’s nightly reign would need to start on a high note.

And who better to start it than I?

Rarity couldn’t help but run one of her hands from her waist to her breast, even giving it a soft tease with her fingertips. Even the well-trained guards, who saw all of those who served the princesses, gave her a few stares as she passed. Rarity had heard all their whispers. She let them do it. She worked hard to look as good as she did. The fact her pendant could only slightly enhance her beauty was proof enough.

The creak of the throne room doors saw Princess Sunset Shimmer walk past, one of her own servants planted on both of her shafts. Rarity did her best to try and ignore the servant’s muffled grunts, bowing respectfully to the tall alicorn.

“Your Majesty.”

Sunset stopped when she saw Rarity, only to break into a chuckle a moment later. “Good luck tonight, little lady. Sparkle needs all the help she can get,” she said before arrogantly strolling past.

Odd… thought Rarity. For one so brash as Princess Sunset, a response so indirect was a bit unusual. But Rarity had her meetings to attend, and thought no more on it. There was only one princess that took space in her heart.

The throne room’s doors opened to Twilight sprawled across her throne, that gigantic cock of hers at full attention. It must have been at least the size of the rest of Twilight’s full sexy frame, throbbing in all its majesty and filling the room with a thick alicorn musk.

To Rarity, the hyper princess being this aroused was a common sight. What was unusual was the distress written across Twilight’s face. Her eyes were closed and her breathing was sharp, struggling against herself. Rarity at first thought Twilight had been impatient and begun rubbing her royal scepter, until she saw Twilight’s hands gripped into the soft cushions.

A slow inhale through her nose helped clear Rarity’s mind. The scent of Twilight’s musk helped; Rarity could already feel herself becoming wet with anticipation. The servant stood up straight as she approached the throne with her warmest smile.

“Good evening, Mistress!”

Twilight turned her head, opening her eyes to the beautiful unicorn. In an instant, her cock grew another few inches. Rarity’s gorgeous feminine frame had always been Twilight’s favorite. Any other night, she’d be overjoyed. Now, it was the last thing she needed to see.

“Rarity!” said Twilight, her grip tightening on the sofa throne. “R-Right on time, as always!”

“I am a mare who prides myself on many things, darling. One of them is my exceptional punctuality,” said Rarity as her hand graced Twilight’s huge shaft, feeling its heat and every little pulse. “And another is my grace around my princess..”

“Nnngh!” Twilight’s hands instinctively gripped the base of her cock as Rarity touched it. A load of her cum just barely stayed contained, almost ready to shoot up to the ceiling. “R-Rarity! Stop!”

Rarity’s brows raised, but she removed her hand as she was told. “Stop? But, whatever for?” A moment, and no answer. Twilight was still desperately trying to struggling with her cock, her grip fierce on what she could reach of its base.

“My stars, whatever is the matter, darling?”

Twilight felt a bead of sweat run down her face as she opened one eye at Rarity. “I-I swore to Sunset Shimmer that I wouldn’t spill a drop of cum tonight! If I… MMPH! If I release, I’ll n-never hear the end of it!”

With Sunset, Twilight meant that completely literally.

Rarity could only frown. Clearly, this is what Sunset Shimmer had meant by Twilight needing help. To think that such a brash boast could stop her from doing what she loved to do! It was unacceptable.

At least it was before Rarity’s lips curled back up into a smile. A very different smile than the one before she’d walked into the throne room. Her narrowed eyes were framed in the shadow of her luscious purple mane.

“So you will not… spill a drop?”

Twilight managed to get both eyes open. Her cock was still rumbling with the urgent need to cum, only managing to prevent it from getting any bigger with all of her concentration.

Rarity’s arms crossed over her chest, hiding her large white breasts from view. “Correct me if I am wrong Mistress, but you only swore not to spill your cum. In my years of service, I’ve pleasured you many times without letting any of that succulence slip away…”

Even in her struggle, a light bulb went off in Twilight’s head. It might have been cheating, but Sunset was never one to play fair. And besides, Rarity’s horn was already glowing with magic. Whatever Rarity had in mind, Twilight was too focused to protest.

As Rarity’s magic enveloped her body, the charm on her pendant began to glow brighter and brighter. In a slow wave, Rarity grew in size, her curves staying in perfectly balanced grace the entire time. The charm aided her in the effort, the size-shifting spell made effortless as Rarity got bigger. A soft jiggle of her breasts with every soft pulse of growth kept Twilight’s eyes going upwards. Rarity’s eyes, meanwhile, were fixated on the flared tip of Twilight’s royal scepter. A hungry look betrayed her calm, collected poise.

“You’ll have to forgive me, darling… I passed on dinner this evening, and I’m simply famished,” said Rarity, continuing to grow as she got to her knees, approaching thirty feet in height. “And I know you can give me enough to fill me up!”

Rarity’s large hands latched onto Twilight’s cock with a sudden intense grip.

“AAANH! R-RARITY!” Twilight shouted, falling back onto her throne. She instantly lost control of herself, but luckily, Rarity’s huge grip stemmed the tide of cum. Twilight felt her balls start to swell from the backlog of cum that was building up. The moment Rarity so much as wavered, it would be over.

“Hold on tight, darling!” Rarity’s growth stopped around fifty feet, kneeling just to fit within the throne room, her hands wrapped around the base of the titanic alicorn dick. Rarity’s large white breasts slid against the shaft, the softness and warmth flowing through every inch of the massive meat. It was enough to make Twilight scream even louder, her cock throbbing forth at least another foot in length.

“I-I can’t… hold on… with you! UNH! You’re the BEST!”

Rarity’s cheeks flushed a soft shade of pink. Her grip tightened and her tits bounced. Her soft lips slid across the flared tip.

“Only the best for the beautiful princess of Equestria.”

Rarity’s mouth plunged onto Twilight’s tip, locking her lips around it. She clasped her eyes shut. The gem on her pendant glowed again. Its magic hadn’t let her down yet. She could only hope it wouldn’t now.

She let go.

Given a release at long last, a massive torrent of cum burst from Twilight’s dick. The princess screamed in a primal passion as it all began its flow. What felt like thousands of gallons of the warm sticky alicorn seed rushed into Rarity’s mouth, the pendant’s magic sparing her from bloating in an instant.

Rarity was prepared for this challenge. Her lips stayed locked hard around the shaft as it sprayed uncontrollably, not letting a single drop past them. All the while, Rarity’s massive tits, each as big as an entire pony, bounced and brushed over the divine shaft, only compounding the release.

“UNH! Rarity!” Twilight bucked her hips with her godly strength, finding the sweet spot that let it all flow down Rarity’s throat. “YES! YES YES YEEEEES!”

Somehow, Twilight came even harder, the titanic purple cock gushing with a mind of its own. Rarity’s soft lips did more than just spare Twilight humiliation; they were very well saving Canterlot from a torrential flood.

The pendant around Rarity’s neck glowed bright, needing to spend more and more of its power just to maintain Rarity’s shape. Being fifty feet tall was one thing. Stemming the flow of a horny alicorn who was pumping hard enough to refill an ocean was quite another.

And still, Rarity didn’t let up. Her hands grabbed her massive white mountains, pushing them around the titanic purple meat, stroking the shaft in a soft massage. Rarity felt every pulse from that cock.

Much as it was unladylike to say aloud, she loved it. Rarity loved seeing her mistress grow so horny that she couldn’t contain herself. The taste was richer than the thickest whipped creams from a wedding cake. The pendant protested with a spark of magic, managing to hold on. Rarity could only keep drinking, too lost in bliss as Twilight’s balls emptied.

Or at least, tried to empty. It was Twilight’s providence and her right to cum as much as she wanted, as long as she wanted, without limit. As much as Rarity had given Twilight, she could scarcely remember the last time Twilight had orgasmed this hard.

Those thoughts soon faded in the thick mist that filled the room. The heavy scent of Twilight’s musk and sweat, combined with the smell of all that delicious cum, was clouding Rarity’s mind to anything but sucking cock.

After a few minutes, the pendant gave out a loud hum that neither of them could ignore. It was nearing its limit. If Rarity didn’t pull off now…

Rarity looked down to Twilight, who was locked onto the pendant, still cumming without mercy. That cock was deep in Rarity’s throat, testing her loyalty. Rarity could pull off now and save herself. Or she could stay, and prove herself.

It wasn’t a hard decision. Rarity’s eyes sparked with a fierce determination, clasping her giant tits together around the relentless cock.

I am a loyal servant. And I will serve my mistress.

The pendant sparked its last few pitiful protests as its magic faded.

“Oooh! Rarity! Unh! Y-You’re…!” Twilight could feel her orgasm approaching control, the broken dam from her balls starting to slow. But there was no saving Rarity now.

It started off slow. Rarity’s flat belly curved outward into a cute bump as the cum flowed down into her stomach. But it wasn’t going to be that easy. As Twilight’s cum flowed, Rarity’s soft lips sucked in every last drop, the cute bump turning into a thick padded pillow. The perfect breasts and curvy ass of the beautiful unicorn started to swell shortly after as Rarity swallowed and gulped.

Even kneeling, Rarity began to fill the room. The flow of cum refused to give her an ounce of relief, flooding her form and making those luscious curves into a bloated, cum-filled balloon as her stomach kept growing. Despite her beautiful body being swollen into hugeness, her expression just glowed with delight. Her mouth was curved into a smile, her face soaked with sweat.

The room shook as Rarity’s huge cum-filled body pushed against its walls. The ceiling would be the next to go if Rarity kept growing. And there was no telling how much longer Twilight royal scepter could keep up with her.

At last, through the murky haze of lust and sweat, Twilight wrestled control of her cock back. The divine infinite maelstrom had finally died down as her balls relented, shrunk back to their original size. The last few trickles of cum slicked their way onto Rarity’s tongue before, finally, her orgasm stopped.

Twilight quickly pulled her cock from Rarity’s lips, careful to keep the last bits of her seed contained before shrinking its size down to a mere twenty inches. Even the sixteen-foot Twilight was dwarfed by the immense cum balloon that was Rarity, who gurgled and grunted her satisfaction.

Not a drop spilled.

A smile came to Twilight’s face. Rarity had never looked more beautiful.

“Nnngh… oh, Rarity… my dear, sweet Rarity.” Twilight stood from her battered throne and rubbed Rarity’s soft swollen stomach, round and warm with an untold amount of seed.

Rarity panted, whimpering with delight as her stomach was rubbed. “Anything… anything for you…”

Twilight stepped back, glancing up past the round hill to Rarity’s face. “I know what I have to do now. And once I finish, I’ll come back to shrink you down and power up your pendant. Because tomorrow night…” She flew up to Rarity’s cute round face, holding her cheeks and planting a kiss.

“Tomorrow night, you and I are really going to see how far I can go.”

Rarity smiled back, peppering Twilight with a few small kisses. As much as she could reach, anyways.

“Mmmh, Twilight, darling… That sounds delightful! But what are you…”

Twilight put a finger to Rarity’s lips. “Remember: not a drop!” A little wink, and Twilight’s horn sparked with magic, teleporting her out of the room in a violet burst, leaving Rarity to herself. Rarity gently hugged as much of her belly as her arms could reach, straining against the walls, ceiling and floor. A content sigh escaped her lips as she bloated unicorn snuggled down into herself.

“How fortunate I skipped dinner after all…”

Out in the royal hallway, Twilight reappeared, standing tall and stretching her arms over her head. The silver crown and jewelry sparkled in the hallway torch light.

“Oh! Princess Twilight!” said Justice Heart, standing at attention. “Your Highness, is something amiss?”

Twilight turned, smirking down at the guardpony. “Not at all. In fact, I haven’t felt this good in a long time! And why shouldn't I, being one of the strongest hypers in Equestria?"

Another little turn, and Twilight's massive prick stared Justice Heart right in the face. The guard braced herself, expecting to be hit with a burst of Twilight's seed. A few tense moments later, Justice Heart opened one eye, only to see her princess already walking away.

"Now if you’ll please excuse me…” said Twilight, walking down the hall, the hyper princess bouncing her pillowy tits and swaying her large booty with every step.

Justice Heart only momentarily fought the urge to stare. “M-My lady, where are you going?”

Twilight’s smirk spread across her face.

“To see Princess Sunset Shimmer.”