Fireworks and streamers, a cavalcade of shouts. The crowd had been gathered, the contestants assembled, and the stage set for the show of a lifetime. It would be a grand contest, stretching willpower, endurance, and the contestants to the absolute limit. Ponies watched with bated breath as the curtains were drawn, a banner unfurling from above:

THE GREAT CUMFLATION CUMPETITION!

The first cumpetitor, Princess Twilight herself, emerged from the left. The crowd was already more than excited by then, but they reached fever pitch when her most noticeable aspect nosed its way on stage long before the rest of her. There was simply no mistaking the royal scepter, that obscene endowment, as it bobbed and swayed into view. It glistened in the light, an impossible length of deep, majestic purple that suited its owner quite nicely. Drips and drops of thick precum pearled at its fat, flared head and fell to the stage in steady rhythm; unmistakable warnings of the the impossible potency its owner possessed.

Having been formally introduced by her ‘personal staff’, Twilight strutted on-stage. Everything about her, from her cocky posture, to the cheery smile on her lips, suggested the peak of confidence, an alpha mare in her element. She was dressed, to abuse the definition, for a performance. Above, a pair of long gloves and a sleeveless white top, capped with a cute little bowtie. Below, a short black skirt that hung at her waist that was hardly more than a formality, worn just for the occasion. The flimsy garment would barely conceal anything on a normal mare, and on Twilight in particular it couldn’t dare to hide the phallic leviathan lurking between her legs. And perish the very thought of panties! Her plentifully plump and pent-up balls swayed gently at her every move, the smooth, shiny purple of her endowment matched perfectly with the smooth, shiny black of her thigh-high leggings. The crowd whistled and howled to see her, of course, smitten already with their princess and doubly so with so much of her on display.

The stage rumbled and shook as the ever-eager Pinkie Pie bounded in behind her. Cupcake after cupcake had certainly left their mark on her figure, and every part of her adorably squeezable body seemed to curve, and curve, and curve. Pinkie was generously proportioned on the most casual of days, and stuffed into her stage attire… well, she seemed almost too much. Her tensely clinging leotard seemed desperate to constrain her, with mouthwatering swells of pleasant pink flesh oozing out from every last edge. To say she fit into her own black thigh-high leggings would be a stretch, and stretch them she did, in all the best ways. Her legs looked as if they had been poured in like strawberry cake batter, because the material looked quite ready to rip at even the slightest provocation. Hard as Rarity had tried, not even her greatest work was equal to the task of containing such a superlatively thick, voluptuous pony.

And while Pinkie was occupied waddling on stage, Twilight was firing up the crowd. She strutted and swayed like she’d practiced for this moment her whole life, hips grown strong and powerful from wielding such an impressive weapon for so long. The crowd’s attention danced between contrasts: petite, boyish Twilight, slender and svelte but for the one massive exception dangling between her legs... and Pinkamena Diane Pie. Hardly more had to be said. Every last scrumptious inch of her, and there were many, was a jiggling invitation to be touched, hugged, loved, as only a truly good friend could. And who better than Twilight Sparkle for the task?

“Hey there, everypony!” she shouted out to the crowd, waving one hand cheerfully above her head. “Are you ready for the most super-duperest show you’ve ever seen?”

“Yes!” the crowd shouted, in one booming voice.

“I can’t heaaaar you!”

“YES!”

“Then give it up for the both of us! That means Twilight and me! Together, we’re Teeeaaam Twinkie!”

“Team Twinkie?” Twilight cocked her head, and the head of her cock followed, shifting weightily over toward its side. “Pinkie, that wasn’t the name I picked for us last night!”

“I know!” Pinkie said cheerfully. “But this sounds so much better than Team Scientifically Guaranteed Victory! Team Scientifically Guaranteed Victory! Team Scientastically Gua... Guara... Garish...” She giggled, laughter rippling through her curves. “See? I can’t say it ten times fast!”

“Hm! I wouldn’t have thought such a talented tongue would struggle with something so simple. A little worn out from last night, maybe?” Twilight chuckled, cheeks flushed the same plum purple as her obscene endowment below. “Alright! We’re Team Twinkie!”

“That’s right, Twilight!” Pinkie began, putting her best stage voice on for the crowd. “But today’s a contest, and you know what that means! Team Twinkie are gonna have their work cut out for them facing off against some seriously staunch opposition today!”

With a theatrical flourish, she thrust her arms out, shaking her hands to the side of the stage: “Mares and gentlecolts, please stamp your hooves for Team... Ahh!”

She didn’t get to finish as the second team burst in from the right, to plenty of their own welcoming cheers - and some resentful jeers beside. Many in Ponyville knew the face, and plush rack, of the Great and Powerful Trixie , and plenty of them were still sore over her past actions. But they were all here to gaze on at the spectacle, and when Trixie herself appeared in a shower of dazzling sparks, the audience knew they were in for one. Say what they could of Trixie herself, she understood how to put on a great and theatrical performance.

She was dressed precisely the same as her princessly counterpart - a magical counterfeit of Rarity’s handiwork - but the royal purple of Twilight’s fur was Trixie’s brilliant blue. It was a good look on both of them, of course, but put side by side, it was clear which pony was the cream of the crop. The cerulean python swaying beneath her skirt could never have been ignored, but Princess Twilight’s was clearly the better fed. Thicker, longer, fatter, it simply dominated the space between them. Trixie couldn’t help but shudder - with repulsion, she assured herself! - as her endowment slid wetly beneath her competitor’s. Massive as Trixie’s magic wand was, it could only bow in deference before Twilight’s truly gargantuan scepter, cowed entirely by royal virility.

“Ahem!” Trixie growled, even as Twilight’s endowment drooled a warm, sticky ‘Hello’ all over her submissive shaft. “The Grrrrreat and Powerful Trixie is well aware of how much space she takes up, but she would thank you to keep your obscene and unladylike… cock to yourself, Sparkle.”

“Mm… Mm?” Twilight was so lost in the crowd’s admiration, she hardly noticed her girthy member weighing down her rival’s. When it did eventually come to her attention, a slight turn of her hips was all Trixie got to help her escape from the princessly prick’s oppressive weight. “Oh, yes, you’re welcome, Trixie. May the best team win!”

“Hmph!” Trixie snorted. Though most of her seemed a pale shadow of Twilight, she had one sole advantage to hold over her rival: potential. No, she wasn’t so hulkingly massive as her opposite, but that was not all it took to succeed. It took grace, skill, and balls holding bigger loads than any pony could possibly guess from their size. She simply overflowed with faith that The Great and Powerful Trixie was the better mare of the two, and the gentle roar of her balls as they gurgled and churned between her toned thighs only confirmed in her mind that she would win the day. “Where is Trixie’s assistant?” she shouted, balling her fists and stamping a hoof. “Don’t tell me you’ve already resorted to scare tactics, Twilight.”

“Nothing of the sort, Trixie. She just has a hard time with live audiences, is all,” laughed Twilight. “Come on out, Fluttershy!”

“Um… okay.” Too timid to refuse and certainly too large to hide, Fluttershy sidled in as well. She, too, was dressed the same as her opposite on Team Twinkie, but while Pinkie’s figure was plump and well-rounded, Fluttershy’s body had decided to specialize. All pegasi grew quite fully up top, to balance the weight of their spreading wings, but neither magic nor science could explain Fluttershy’s assets. Massive, wobbling mountains rested heavily on her chest, meeting together in a deep, butter-yellow canyon. She was hardly comfortable in anything but the roomiest tops, and now she had been smooshed and squished into a stage outfit that could barely hold Pinkie. The straps of her leotard strained audibly to hold her, the poor overworked outfit stuffed to the brim with breast, breast, and more breast still. They seemed destined to snap at any moment, and surely would before the day was done.

“Cheer!” Trixie commanded the crowd. “Applaud and shout for Team The Great and Powerful Trixie and Her Huge-Titted Pony Bitch!”

Fluttershy could only squeak helplessly at the attention. But Trixie reveled in it, basked in it like a cat in the sun with a side of cream. She held her arms out wide, drawing energy from the crowd. Yes, this was her element; her truest magic. There was no chance that she could ever lose here.

“Well, Trixie," Twilight said. “That’s all of us!” She shot Fluttershy a friendly wink, while Pinkie waved enthusiastically from behind her. “Would you like to do the honors?”

“Naturally. ” Trixie’s horn glowed and a hush fell over the audience. Slowly, majestically, the velvet red stage curtain lifted to reveal a giant hourglass, nearly taller than the contestants themselves. “Fillies and gentlecolts!” she shouted in her loudest, most attention-grabbing voice. “The Great and Potent Trixie has challenged your Princess Twilight Sparkle to a duel!”

“I tried to warn her no~ot to,” Twilight cut in, in a playful sing-song tone. She smiled and patted her pulsing cock, rousing it to full length with long, luxurious strokes. “But she was simply too insistent on paying me back for our last duel. I suppose some ponies are just gluttons for punishment~”

“Stick to the script, Sparkle,” Trixie huffed. “Tell them the rules.”

“Oh, yes!” Twilight’s eyes brightened. “The rules are very simple. We have one hour to prove which of us is the most productive pony.” She beamed at Pinkie, and then Fluttershy. “Our assistants will be helping us demonstrate, of course. The biggest belly wins!”

“That’s us!” Pinkie shouted, pointing to both herself and Fluttershy. “Be sure to cheer for both of us! Especially Fluttershy. She looks really, really cute in that outfit!”

“Um…” Fluttershy tried to shrink away, but her outfit had already failed to compress her proportions to reasonable size, and she couldn’t hope to do better herself. “Could, could somepony - anypony - else volunteer, instead?

“I don’t know if I could handle such a big...” She paused for a deep breath and her eyes dropped like a stone to the velvet-blue endowment throbbing in sinister fashion between Trixie’s legs. Fluttershy swallowed down a loud gulp, her tongue momentarily hanging from her mouth as she stared herself cross-eyed. “...Responsibility!”

“You can, and you will!” Trixie snapped. “The Great and Powerful Trixie is simply too talented to be held back by such a meek and unworthy assistant.” She grinned gleefully at Twilight, a predatory spark dancing in her eyes. “Besides that, your only role here is to ease Trixie’s great and unfathomable pressure. Once Trixie finishes this contest with a complete, humiliating victory, Twilight Sparkle will become a much more fitting assistant for Trixie’s performances.”

“Oh?” Twilight put a finger to her chin, as if deep in thought. She shifted her hips, the pendulous weight of her swaying balls slapping gently against her thighs. “Well, that wasn’t what I was planning after I beat you in front of the whole town... again. I was planning on making you a royal consort - with your own uniform, of course! I get so pent-up while I’m studying, you see.”

Twilight kicked her hips the other way before continuing: “I could be nearly twice as efficient with a cute assistant to drain me! Goodness, all the things I could get accomplished with a cute unicorn study buddy...”

A thin stream of drool trickled from the corner of Twilight’s mouth, and the head of her cock drooled with something much thicker and muskier. She wiped her mouth and winked at the crowd. “Spike, I know you’re watching us~ Go schedule Rarity for an appointment with Trixie, won’t you?”

“T-the nerve!” Trixie stuttered, nostrils flared. “Fine! We shall settle this here and now!” She grabbed her timid assistant roughly by the arm and led her over to their half of the stage, glaring at Twilight as her rival casually beckoned Pinkie to hop on their side. Trixie’s horn glowed and the hourglass flipped itself. A great, pillowy wumph sounded as a heap of sand settled, and began to pour from top to bottom - grain by miniscule grain.

The crowd hushed, the only sounds the steady tinkle of sand in the hourglass, and Pinkie’s anxious bouncing and bobbing. Though the hourglass had started, tradition still demanded that the challenger declare the start in any duel. Twilight waved silently at Trixie, a very smug smirk spread across her face. She only mouthed the words, but it was clear as crystal what she’d said.

“Ready to lose?” Trixie muttered venomously. “Well, Sparkle, we shall see who gets the last orgasm now, won’t we? Who tastes the sweet, sensual glory of victory, and who tastes the salty seed of defeat!” She took a deep breath, mustering all the air her lungs could hold to make the announcement: “The Great and Powerful Trixie declares this contest... begun!”