Winter Weight: Up

by Liquid Savage

Rating: teen
Tags: Random, Pinkie Pie, Discord, Slice of Life, My Little Pony: Friendship is Magic, Comedy
Length: 5018

A strange stallion arrives at Sugarcube Corner with some Hearth's Warming snacks for Pinkie to try...

Pinkie Pie has been baking up a storm for the Hearth's Warming rush, making sure cakes, cookies and pies get sold to everypony she can manage.

But one day, a peculiar stallion emerged in the bakery, with some magically delicious cake for Pinkie Pie to try, said to contain a 'special ingredient'.

What will happen when such a treat comes in contact with the sweetest tooth in Equestria?

A new story I just finished a few minutes ago! I really hope it's up to par for you all :fluttercry:

Merry Christmas/Happy Hearth's Warming! :yay:

Published 2016-12-25 04:00:01 UTC
Last updated 2016-12-25 04:00:01 UTC

"I'm not giving him cake, I'm ASSAULTING him with cake!"

The afternoon sky over Ponyville was cloaked with dark clouds as far as the eye could see, causing snowflakes to float gently down from above and cover the central Equestria village in a rich, white blanket.
Ponies clad in hats, boots and coats walked this way and that, most toting bags and even small carts of Hearth's Warming gifts. The holiday was right around the corner, and from the flickering lights, ribbons, bells and wreaths all over town, along with festive music playing through speakers set up around the town square, Ponyville was in full holiday cheer despite the bleak weather.

But nopony's spirits were higher than Pinkie Pie's. The curly-maned earth pony, Element of Laughter, and resident party queen, was zipping this way and that all over the kitchen of Sugarcube Corner. Being an employee at Ponyville's premier bakery, Pinkie's skills with a mixing bowl and an oven were almost unparalleled, second only to her employers, the Cakes.

When Hearth's Warming rolls around, Pinkie goes into overdrive, nearly burying Sugarcube Corner in gingerbread ponies and houses, sugar cookies, candy canes and many other kinds of sweet treats to fit the season. They sold like hotcakes every Hearth's Warming season, and a successful Nightmare Night beforehoof meant the Cakes were always rolling in bits come new year.

Pinkie was sure that this year would be no exception. She knew how good a baker she was - because she always did plenty of taste testing. Some might say a bit too much taste testing, considering how...plump she would get come autumn. Even her famous metabolism and energy couldn't keep up with the Nightmare Night candy and Hearth's Warming treats she shoved into her mouth every year.
She looked more like a giant bubblegum ball that grew legs, a face and got some pink fluff stuck on it. The balloons of her cutie mark had inflated themselves to keep up with how big her thunderflanks had gotten. Her chubby cheeks breached her peripheral vision just a bit, and she had a slab of double chin beneath her mouth. Nopony could figure out how she could zip around at such a size, but with Pinkie Pie, one tends to abandon logic altogether.

The morning had been just like any other morning. Sugarcube Corner, like the rest of Ponyville, had been decked out with the nicest Hearth's Warming decorations, with delicious cookies, cakes and pies for the season in the display window. With Mr Cake and his wife (who had also gotten a tad 'fluffier' in the colder seasons) handling business around town, Pinkie was left to watch the bakery. They could trust her with their lives, and their foals' lives as they found out a while ago, but her self-control around baked goods wasn't the best. Especially near Hearth's Warming.
The plump pink pony was preparing to throw another batch of ginger and eggnog cookies with white chocolate chips into the oven, when her ear pricked up at the ding-a-ling of the front door. Wasting no time, she rushed out to behind the counter, and saw a grey unicorn stallion with a short black mane, amber eyes and a peculiar blue horn, saunter up to the counter. Craning her head, she could see he was carrying a silver domed dish in his magic, and she caught a glimpse of his cutie mark - a tornado, she figured.

"What can I do ya for, stranger?" She beamed, then pointed a thick hoof at the dome, "And what've ya got there?"
"Good morning, my good pony," the stallion began, in a strangely familiar voice, and gave a small bow of his head, "who I am isn't important, but what I do certainly is. I'm sure a connoisseur of fine confections such as yourself wouldn't mind judging an aspiring fellow baker's little experiment?"
"Oooo!" Pinkie squeaked, pattering her hooves on the counter and sending rippling waves through her blubbery form, "I love taste testing! Lemme at it!"

The stallion, seemingly satisfied at Pinkie's lack of suspicion, happily lifted the dome. Beneath it was a rather large, plump chocolate cupcake, about the size of a pony's head, with a generous topping of cream and sprinkles.
"I made it with my own special ingredient," he explained to the wide-eyed, drooling Pinkie, "and I wondered if I could get an expert's opinion, if you're not too busy."
"Too busy for baked goods?!" Pinkie yelped, and breathed in a loud, long-winded gasp, "NEVER!" And with that, she grabbed the cupcake in her hooves and took a large bite.

The second it entered her mouth, she froze. Her eyes went from blue plates to little marbles, and a cascade of chocolate and frosting burst onto her taste buds like nothing she'd ever tasted before. A seed of urge inside her head quickly sprouted roots. A desire for more of this amazingly delicious treat. Not just one bite would do, she needed another. Another nice big mouthful.

And she took another. Then two more. Then three more. And she only stopped chomping when she realised she was just eating air.

"I get the feeling I have your approval?" The stallion chuckled, noting the near desperate look in Pinkie's eyes.
Pinkie wasn't satisfied. Not yet. "Do ya have more? Two more even? Or a baker's dozen? Three baker's dozens?!" She pleaded, while licking crumbs and cream off her mouth at great speed.
"I'm afraid I only had that one sample with me," he admitted, then levitated a little vial of see-through liquid from behind his head, "But I'll tell you what - I'll let you have my little secret ingredient here, on one condition."
"What do ya want for it?!" Pinkie yelped, "I'll give ya anything! All the cakes we got! All the bits we got! All the cakes AND bits we got!"
The stallion chuckled and raised his hoof dismissively. "Oh no no, nothing like that. I just want you to make sure everypony in town gets a taste of this ingredient here. Use it in your baking and get everypony in town a piece, and I'll keep bringing you more."
"I...I can have some too, right...?" Pinkie almost whimpered, "I gotta have more of this yummy nummies in my tummy!"
"Of course you can," he snickered, patting her poofy pink mane, "You can have as much as you want...as long as the town keeps getting them too."
"DEAL!" The party pony squeaked, and grabbed the vial out of his magic, "You got a good point too. Why should I keep all these delicious treats to myself when I can share them with everypony~?"

The stallion smirked rather darkly, watching as Pinkie's eyes spiralled in many colours as if she were being hypnotised. Or discorded. A wide, vacant smile was plastered across her muzzle, causing a bigger squint in her eyes from her chubby cheeks.

"Exactly the idea," he chuckled, and turned right around, "I'll expect some good results within the week. Tata~"

A few moments after the stallion left, Pinkie's eyes continued to spiral, until a little ding! sounded in her brain and they returned to their normal blue. The vacant smile became a smirk of motivation. She thundered into the kitchen and wasted no time in sprinkling this 'secret ingredient' over the cookies she'd been preparing. No doubt they'd soak right into the batter in the oven.

"Give everypony a taste," Pinkie purred under her breath, a mischievous smirk forming on her fat face. "A nice big taste~"

The next day, Twilight Sparkle took a seat on her throne in her castle's meeting room. While she got comfortable, she watched four of her friends settle down in their own thrones. Spike, her baby dragon and number one assistant, settled down in a cushion next to Twilight.

"Okay," she began once everypony was sat down, "Pinkie Pie called us all here for something...um, how did she put it? 'Super ultra mega importantly important'?"
Rainbow Dash cocked one of her eyebrows. "She told me it was superly mega-super-duper crucial."
"Ah heard it was incredibly mega-ultra-super big," Applejack added.
"Um..." Fluttershy murmured from her throne, "she told me it was super crucially ultra importantly mega big of a deal."
"Look," Rarity spoke up, sitting proper on her seat, "I think we've confirmed that whatever Pinkie Pie has called us for, it's important to her."
Everypony else nodded and muttered agreement, but before another syllable could be spoken, the throne room doors burst open, with Pinkie Pie strutting in.

Well, it was less a strut and more a waddle. Strapped to her bulbous body was a large pink cart, with a huge stack of cakes, pies, cookies, and all other kinds of Hearth's Warming treats. Pinkie had certainly been busy since yesterday morning.
"Super-duper-perfecto! Everypony's here!" She chirped, then unstrapped herself from her cart and, with no trouble it all, lifted it onto the table before plodding to her chair.
Everypony in the room just stared at the plentiful pile, some in confusion, some in hunger.
"Um, Pinkie, darling," Rarity piped up after a long silence, "not to sound insensitive, but...you called us all here to let us see your Hearth's Warning baking?"
"What? No!" Pinkie giggled into her plump hoof, "I called ya all here to set you taste it!"

"S'that all?" Applejack asked, cocking an eyebrow, "Ah was here thinkin' it was some kinda emergency."
"It is an emergency!" Pinkie argued, "Hearth's Warming is a few weeks away, and I gotta have these tasty new treats perfect in time! Or Hearth's Warming won't be nearly as warm! And we can't let anypony's Hearth's Warming be not as warm without some nice warm cakes and cookies! It'll be a Heart's Colding!"
"Pinkie, it's really not..." Rainbow Dash began, but trailed off as she locked her eyes onto the cart of confections, "Well...to be fair, that stuff does look good..."

Everypony (except Pinkie, somehow) jumped when Spike burst out from the mountain of treats, cheeks bulging with pie.
"It tastes great!" The baby dragon declared after swallowing, and grabbed a hearty slice to push into the alicorn princess's face, "Twilight, you've gotta try this!"

Twilight blinked slowly, and immediately spotting something...off with Spike. His eyes were spiralling in different colours.
"Spike, are you feeling oka- mmph!"

She was cut off by the dragon stuffing the pie into her mouth. Her first instinct was to spit it out, but it was too late. A delicious blend of minced fruit, cinnamon and cream exploded onto her taste buds, her eyes widened, and her next, and conquering instinct was to chew and swallow with a giddy giggle.

The same spiral appeared on her eyes for just a moment.

"Mmm, ooh~!" She purred, and stuffed more of the slice into her mouth, "You weren't kidding Spike! Everypony, you've gotta try this!"

The rest of the ponies, bar Pinkie, exchanged glances. Rainbow Dash shrugged and reached over for a hooffull of cookies.
"Well if Twilight says they're safe," she decided, then tossed them into the air, "down the hatch!" She hovered in the air and caught every cookie in her mouth, one by one, her cheeks bulging and mouth covered in crumbs.

She underwent the same reaction as Twilight. Eyes spiralled, crumbs quickly licked off. "Whoa Pinkie, you really outdid yourself this time!"

Rarity, Applejack and Fluttershy decided to give in to their curiosity and try out Pinkie's concoctions. And of course, within moments, everypony (and dragon) was almost fighting to get another mouthful of what was on the cart.

Crumbs flew. Frosting splattered bodies and furniture. Jaws chewed. Bellies distended.

Pinkie watched, after sneaking a generous helping of cinnamon cake, and giggled to herself.

"I've shared with my friends," she muttered, "but I gotta get it to the town."

"Pinkie, please tell me you got more!" Rainbow Dash cried, "This stuff is so awesome!" She burped, and rubbed her rounded belly.
"Actually, I may have judged it a bit too early myself," Rarity purred, "I would love some more too."
"Um...me too," Fluttershy near whispered.
"Hoo-wee, this stuff's nearly as good as mah own apple fritters!" Applejack declared, "Ah'd love some more'a this mahself, sugarcube!"

The pink baker smirked. "Come by Sugarcube Corner anytime, I'll have some ready to sell~"

Just like she promised.

In just a week, Pinkie Pie's new recipe for Hearth's Warming treats had passed through every pony's mouth in Ponyville. And like her friends, everypony who tasted it fell in love right away. Orders for more and more had exploded in the past week, and Pinkie had more than enough energy to oblige. Her friends seemed to be particularly fond of them, especially Rarity with her infamous sweet tooth that came second only to Pinkie's when it came to the Mane 6.

However, it wasn't just demand that was expanding. Everypony had begun incorporating the desserts into their every day meals, and snacking between them. And with the amount of sugar and calories packed into each one, combined with the super-addictive additive constantly provided by the mysterious grey unicorn, the effects were clear to see.
A stallion's stomach bloated into a barrel shape, a mare's plot expanded like a pair of fur-coated globes with her cutie mark stretching to attempt covering it all, a filly's legs thickened like tree trunks with a roll on each of her knees, and a colt's cheeks puffed up on his face to cause a squint and grew a slab of fat pooching out beneath his chin.

Pinkie Pie, of course, was no exception. Dedicated to her craft, she felt obligated to take a taste test or two (dozen) of each sweet every day before putting them in the display window. This job, or freedom, allowed her to have as much as she wanted, and she blew up from a pink balloon to a large bubblegum mass of pony, with the appearance of a partially melted scoop of ice cream with added rolls of blubber on her sides and back. The balloons on her flanks had inflated even bigger to fit her thunder-and-lightning flanks, and her barrel-like belly wobbled side to side like a furry pendulum when she waddled around, which also sent quaking ripples through her oversized upper legs and plot. Her cheeks protruded from her face like a pair of tennis balls, giving her a squint and her crumb-coated muzzle always forced into a smile. Not that she needed to be forced to smile, with how happy she was in her current situation.

"Thank ya kindly, sugarcube," Applejack said to her large pink friend, before grabbing the large bag of chocolate-apple cupcakes she'd ordered. Thanks to her strong hind legs, while she only got a little round in the middle, her flanks were enormous orange domes with three plump apples on each side. While her new size and gluttony hadn't halted her work ethic, she had certainly slowed down in the past week.
"Anytime, AJ!" Pinkie chirped, "Enjoy~"
The big-bottom belle chuckled greedily to herself as she turned, and her great backside wobbled and swayed side to side as she plodded toward the door. Presumably for a mid-work snack.

Though, Pinkie was caught by surprise. Not only had she just noticed the line of ponies that was hidden by Applejack's prodigious posterior, but the next pony in line was the grey unicorn who kept supplying her with her special ingredient.
"Oh, hiya!" She beamed, "Have ya got more of that--?"
"Naturally," he purred, and produced a large vial of the familiar and oh so precious liquid, "But, I've had an idea to increase sales for the Hearth's Warming season."
"But I got everypony to try the treats," Pinkie muttered, reaching her plump hooves for the vial, "And they're huge! ...kinda like everypony else lately. Hehe~"
"Oh I know you have," he chuckled, "and I'm very pleased with the results. But what I mean is, why don't we expand to outside Ponyville? Like...the princesses, perhaps~?"
"Oooo!" Pinkie grinned, "Ya mean bake for Princess Celestia and Luna?"
"Exactly," he smirked, "It's no surprise Celestia has quite a sweet tooth, so why not see what she makes of them?"
"Yeah!" Pinkie giggled and swiped the vial as soon as it was close enough, "Maybe she'll get everypony in Canterlot to try 'em too! And Appleloosa! And Manehattan!"
"And everywhere else in Equestria," he added with a chuckle, "so, I'll make the arrangements and let you know when to expect them. Perhaps this weekend?"
"Okie-dokie-lokie!" Pinkie chirped, "And now I gotta get some bakin' up in here!" She added, meekly looking at the line of grumpy-looking blob ponies behind the petite-in-comparison stallion.
"Of course, of course," he chuckled and trotted out of the line and toward the door, "Don't let me keep you, I'll see you in a bit~"

Before Pinkie could yell for the next pony, a familiar voice cut over the ruckus.
"PINKIE, DARLING!"
Ponies and foals were bumped and shoved to the side as a mare looking more like a squashed snowball with purple on top sauntered up to the front. Her massive diamond-flanked rump bumped remorselessly into everypony it passed. Her huge, almost saggy cheeks had a permanent blush.
"I need some chocolate ice cream cake! Two full ones to be precise!" She ordered, her voice deeper from having her neck fat pressed against her throat.

Pinkie giggled and looked at the vial. More special ingredients for more happy ponies, and Sugarcube Corner would be rolling in bits come Hearth's Warming!

"Comin' right up, Rarity~"

That following weekend, the meeting was on. Somehow, that grey stallion had convinced the Princesses to come to Sugarcube Corner and have a look at what was causing the confections craze across Ponyville.

Pinkie, somehow, kept zipping from one part of the bakery's kitchen to the other. She had already grown so much from sampling her own wares.
Her soft, wobbling pendulum of a belly was just inches from the ground, and her flanks were so large that just one of them was bigger than a grown pony's head. Each of her legs sported a big thick roll of flab that sagged over her knees, and her sides and back grew even more soft, blubbery rolls. Her cheeks had begun to sag, and she had even more of a squint. Her sheer width, which made her look like an overstuffed pink puff of candy, gave her quite a lumbering, waddling gait that often had her panting for air.

Two large, multi-layer chocolate and ice cream cakes - one white and the other blue - were set at the side in the kitchen while Pinkie worked on some more cookies and pies for the hungry crowd. The two cakes made just for the princesses to sample. And hopefully devour.

A fanfare of trumpets from outside caused her to freeze. They were here!
"Pinkie, dear!" Mrs Cake poked her very round head in from the storefront, "The Princesses are here! Bring out their cakes!"
"Yes ma'am, sir, ma'am!" Pinkie saluted her employer and balanced the cakes on her fold-laden back. Given her width, standing with them was no problem at all, but her waddling made it a little awkward thanks to them slightly sliding along her flabby rolls, but she moved surprisingly fast for her size.

As soon as she exited the kitchen doors, something huge, blue and round stopped her momentum right away. She squished right into the round dome, causing the cakes to fly over her head.
"Oh, sorry honey!" Mrs Cake said, her voice slightly muffled. Pinkie pulled her head out of the squishy blue thing, watching it ripple like pond water disturbed by a pebble. A trio of large, plump cupcakes were on one side, and on the other was a curly pink tail. She had bumped her head into Mrs Cake's flank, and her plot had to be the size of a carriage!

"No worries," Pinkie giggled and leaned her fat front hooves on the counter, "I landed on something soft!"
Mrs Cake chuckled and did the same next to her, causing both massive mare's flanks to squish together in the cramped space behind the desk.
"Oh my, Pinkie," The older mare purred, staring at the two cakes that had somehow landed harmlessly on the counter, "you really outdid yourself this time...mmm, maybe I should take a little-"
"Ah ah!" Pinkie chided her softly, giving the blue hoof reaching for the cakes a little slap, "Those're for the princesses! Buuuuuut, I can always make ya some after~"
"Oooh, if you don't mind," Mrs Cake giggled, "I don't know how you did it, but lately you've really had the touch~"

Pinkie only had time to let out a hefty squee before a pair of royal guards walked into the bakery. Right behind them was the tall, svelte and pure-white alicorn princess of Equestria, with a slightly shorter, dark blue alicorn following right behind her. Their shimmering manes waved elegently at their sides.
While they usually wore warm, friendly smiles when they walked amongst their subjects, Pinkie could tell their smiles on that day were laced with underlying concern. No doubt they were wondering why Ponyville had gotten so...portly lately.

"Your majesties," Mrs Cake began, she and Pinkie bowing their flabby heads, "We've been expecting you. Thank you for coming to try our new Hearth's Warming treats!"
"Yes," The taller alicorn kept up her smile, even as she looked out the window at the obese ponies staring from outside, "We've heard they're...quite big here."
"They're not the only things," Luna snarked under her breath, earning a subtle nudge in the knee by her sister's hind leg.

"We made some super-duper-delish cakes just for you two!" Pinkie chimed in, pointing a flabby hoof to the two cakes, "Try some!"
The two princesses eyed up the cakes, with differing expressions. While Luna looked mildly intrigued, Celestia's tongue quickly slid across her lips. Her legendary sweet tooth was renown across Equestria.
"That does certainly look delicious," she chuckled, and used her magic to lift a slice of the white cake to her mouth, "I assume this one is mine? Luna, why not try some too?"
"Sister, are you sure?" Luna asked, while lifting a slice of the blue cake with her own magic, "You know how your diet gets in the winter season."
"It's the season of indulgence, isn't it?" Celestia smiled, "Come on, what harm is just one slice?"

Luna looked at the blue cake, seeing the chocolate and ice cream inside, and sighed. "I suppose...fine, but just one."
Both princesses simultaneously took a bite of their cake and took a few chews.

Both sisters froze. Their eyes widened, and wide smiles crept across their muzzles as chocolate and ice cream made themselves at home in their taste buds.
Wasting no more time, they crammed the rest of the slices rather greedily into their mouths, moaning and wriggling while crumbs and cream coated their muzzles.

"Mother of me," Luna gasped, "this is good!"
"I told you~!" Celestia cheered, and grabbed the whole cake in her magic, shoving her face in it, "Mmm! Ooh, we must have some of your Hearth's Warming treats for the palace party!"
Luna did the same with her own cake, cramming a mouthful into her muzzle. "And we shall tell all of Canterlot to come and try some!"

"Really?!" Mrs Cake and Pinkie squeaked in joy. The princesses simply grunted in reply, their eyes spiralling colourfully in the split moments they opened them.
"We must make the announcement right away," the older alicorn declared, before turning to exit the café with the royal guards, "Coming, sister?"
The darker sister simply burped in response, and took her own cake too as she followed. "Good day, and our thanks."

As soon as the princesses were gone, employer and employee squee'd and embraced in a soft, blubbery hug. Their chubby cheeks squished together as they nuzzled.
"Oh Pinkie!" Mrs Cake squealed, "Your new treats are a hit! Now everypony is going to get some!"
"Ooooh, I know!" Pinkie giggled, her massive plot wiggling with glee, "I'm so happy, I could--"

She was silenced by what sounded like a pair of irate manticores. The feeling of their bellies bouncing against each other made them looked down, and they realised the growls were coming from their hungry bellies.

"I think this calls for a celebration~" Mrs Cake purred, rubbing a plump blue hoof over her waterbed of a middle.

Hearth's Warming Eve was now just a few days away, and despite Equestria's population blowing up like balloons all over, everypony's preparations were complete. Gifts were ready, decorations were up, and treats were prepared.

And eaten.

Pinkie Pie had been baking up a storm, with ponies from every corner of the kingdom coming to Sugarcube Corner to sample the famous treats for the season. And the effects were really starting to show.
Bellies touched floors. Flanks crushed couches. Stallions collapsed beds. Mares got stuck in doorways. Foals outgrew school desks and crunched benches.

But nopony gave it much thought. They just ate and ate, and then ate some more.

Being the first town hit with the craze, or plague, Ponyville's residents were more like blobs than ponies. They either slowly lumbered around on plump tree-trunk like legs, or just relaxed on their plush, roll-laden plots and enjoyed more sweets.

But nopony in all of Equestria, not even Rarity or Princess Celestia, were affected as much as Pinkie Pie.

To call Pinkie a pony would be incredibly generous. She wasn't even a blob anymore. She had transcended into a house-sized, tremendous mass of quivering pink fur and blubber. All that remained visible of her legs were the plump stubs of hoof squirming out of a plethora of folds, which her legs had sucked right into. Her flanks, and the pony-sized balloons of her cutie mark on them, had grown to the size of a pair of carriages, with her curly tail almost comically tiny in comparison. Her front was a pink avalanche of chin folds, beneath a pair of cheeks that looked more like giant, deflated hoofballs that nearly made her face invisible. Slits of her eyes and her mouth could just barely be seen...even if she did need some magical help with eating and baking.

And despite how gigantic she was, she could still get around. Back when she was smaller, she used her strong legs to bounce around town. But at this great girth, she used her belly to do that. The squishy mass of pink fat surprisingly had some springiness to it, and the ground shook and even cracked a little as the massive pink puffball bounced around town. She didn't feel any cold at all either - she had so much padding that she actually *sweated* in the snowy winter.

Rhythmical tremors shook every blubbery body in town, inside or outside, as the great mass of pink rubber blubber bounced through the town streets, minding her own business. Her smile was almost impossible to see through all that cheek blubber pushing against it.

It took Pinkie a few moments to realise that her bouncing had somehow come to a halt, and something prickly against her belly tickled and sent her jiggly mass wobbling and sloshing from giggling.
"Hehehe...what'sh...goin' on...?" She mumbled, her voice deepened from the neck fat pressed against her vocal chords, lisped from the cheek fat covering her mouth, and slowed from the sheer exertion of speaking.

"I just wanted your attention," the grey unicorn's voice sounded from right behind her, causing her ears to slowly flick up, "so I put a little bail of hay under you to stop your bouncing around. Goodness knows you can't stop yourself."
Pinkie giggled as she felt his small body pressing into the fat on the back of her neck. "Ya have...more of that...-"
"Oh, I just thought I'd come to tell you a few things," he easily interrupted her, "like my name. I can't believe I never thought to tell you it."
Pinkie let out another deep, wobbling giggle. "I know...it'sh you...Dishcord~"

The stallion went silent for a few moments, then chuckled. A flash of light appeared above Pinkie's peripheral vision, and suddenly a long, overbite-toting face appeared upside down before her. "How'd you figure it out?"
"Jusht...a guesh," Pinkie rumbled, "and...recognished...your voishe...!"
"Ah, that's definitely a giveaway," the draconequiis muttered, almost to himself, "well, I'm sure you're wondering a few things? My motives, the special ingredient and such?"
The enormous earth pony nodded as much as her fat neck, or lack thereof, allowed.

The Spirit of Chaos stretched his long body across the length of Pinkie's flabby back.
"It's simple, really," he explained, "see, ponies are known to get rather fat and lazy around Hearth's Warming, don't they? Well I figured, wouldn't it be funny if they became the fattest and laziest ponies in Equestria? Or the world? The pure irony, it's a hoot! As for that special ingredient...I just took some water and hit it with some magic~"

Pinkie took a few moments to process all this, the fact that Discord had been playing along as a joke all this time.

"Though," he went on, "getting your bakery all successful was a nice bonus. I just wanted to have some fun."
"Ish thish...perma...p-perm..." she panted, struggling to get the multi-syllabic word out with how easy she was to get out of breath, "...gonna lasht...forever...?"
"Oh goodness, no," he chuckled, "it'll wear off in time for Hearth's Warming...for the most part. The spell will wear off, and ponies will shrink down to...waddling size~"

Hearing that, and knowing Discord was (mostly) good now, gave Pinkie a moment of clarity. If she was going to be back down to a somewhat normal size soon, then...

"In that cashe..." she chuckled, and ran her tongue across her plump lips, "you got...any more...of that...shpecial ingredient? I got a mood...for food~!"

Discord chuckled and made a pyramid of his fingers. This would be a rather merry Hearth's Warming indeed.