The following week had been an eventful one for the rapidly plumping mare. More rhythm. More consumption and gluttony. Rainbow Dash wondered and fluttered at how big she would get, her mind aswirl with a fantasy that rapidly became real. The morning reviews in the mirror had been telling. Each day, pushing her limits. Three boxes of sweets and two cartons of heavy cream. Then four and three. Then five and four. Hours of blissfull fullness and scandalous self-stimulation. Now that she caved and was truly gaining, a few extra inches on top of the bulbous belly and sumptuous, curvaceous butt were hard to notice day by day, but the results were there. And she took her time inspecting every last detail. The soft, jiggly roll between her legs pulsed over the course of the day, first as packed, taught fullness and then back down into squishy, pliable flab. The roll receded less and less after each bloat as the endless calories packed on the pounds, leaving her with a permeant pot belly which was soft to the touch and happily protruded as she sat, usually eating even more. It needed to expand again, after all. Her butt swelled to impressive proportions, jiggling with every step. Rainbow Dash found sitting on it remarkably comfortable. Like a seat cushion. Like pillowy dough that supported and upheld her permanently lazy lifestyle. The fact that it was her, it was her getting cushy and soft proved very thrilling.

Fluttershy did not have the luxury of seeing the results of daily, calorie packed binging like Rainbow Dash was witnessing. So, the sight before her that day was a bit of a shock.

“Goodness, Rainbow Dash, um…you are looking rather…generous today.”

The yellow Pegasus sought polite words to describe the enlarged friend before her. She observed that where once there was toned muscle that made skinny mares like her a bit jealous, there was now a sizeable layer of padding. Around her stomach, a solid roll of fat, draping downwards in front of her hindlegs. Cutie marks stood engorged and exaggerated, desperately covering a mass of flank that every stallion in Ponyville marveled and imagined privately during ‘me time’ in their homes. She was not quite ‘fat.’ Nopony could quite call her fat. But good heavens above and Celestia below, she was thick like some mares could only ever dream of.

“Thanks, Fluttershy. Impressive, isn’t it?! I’m really throwing myself head first into my training.”

Fluttershy hid her scoff and maintained her cordial tone, but the screaming ‘more like stomach and butt first’ nagged at her mind.

“I remember you talking about animals hibernating, and something about you gaining a few extra pounds at the same time.”

“Oh, yes, during this last winter I prepared a special calorie-enriched oatmeal mix that would help the predators in my care fatten up without hurting the other creatures. It’s um…quite flavorful, I can confirm that. I could barely fit in my holiday sweater by the end of the batch I made. But um…are you sure you would need a thing like that? It’s not something that’ll make your appetite bigger. It’s quite filling, actually. And besides, you’re uh…you don’t exactly need-“

Fluttershy searched her mind for a kind way of telling her friend that she was getting chubby. Some way to say ‘you look ready to hibernate and then some!’ Quite a few mares liked having some extra padding. Fluttershy noted that some creatures especially enjoyed sleeping on her softened lap when she got a bit heavier. But this was really starting to push it. Rainbow Dash simply scoffed and bulged in.

“If anything is going to help me demolish the competition in Las Pegasus, it’s the sort of thing that’ll knock out a bear! Think you can hook me up with some of that special oatmeal?”

“I um…if it’ll help you reach your goal, I’d be happy to help.”

Rainbow started having a hard time climbing back up to her house, her wings strained to capacity. And the mirror, apparently, was not a liar. After Dash supplemented her absurd ‘diet’ of pastries, cream, and sugar with a an honest-to-goddess weight-gain supplement, it was no longer possible to keep track of when she was ‘just bloated’ or truly, seriously fatter than usual. Her grin beamed with an absurd but sincere glee. She was clearly getting fatter. It was inevitable. Unmistakable. With the facts of her protruding belly and bouncing bubble butt firmly – or rather, softly – established, all they did now was swell, more and more each day. She noted a heavy wobble with every step. Her gait widened to accommodate the round belly between her legs, bumping against them no matter how she tried to adjust her gait. The new sensation was intoxicating. She couldn’t help but purr to herself as chub rubbed against chub.

The past few weeks had been a whirlwind of food and enlarging. But after a few days of gorging herself on the oatmeal, Dash sought out Rarity for her special, ‘mood-altering’ comfort ice cream. She was bulleting through the chubby stage, but she knew there could be more. Even more, even faster. Clearly, more help was needed. At least in her ravenous mind. Two more stops.

“Darling, are you sure you’re not going a bit…too far? I mean, I would still like to tailor your dress by the end of this.”

Evidently, Dash had passed some threshold of bigness because Rarity was clearly alarmed and trying her best to hide it. This was approaching plus-sized model territory! She wondered if Rainbow’s gigantic behind could even be contained by her usual catalogue. Rarity feared that even the scratchiest fabric would tear open and the strongest buttons would pop.

“It’s not the end of the world Rares. Twilight is cooking up that spell, so it’ll all be over once I’m done competing.”

Generosity apparently trumps a truly awkward intervention. Dash seemed sure of herself, at least. There was no way she hadn’t noticed by now. And besides, after a few tubs of extra fattening ice cream, surely the chubby Pegasus will give it a rest. Surely. Rarity scrambled to justify it to herself as she watched the globular blue flanks of her friend lumber down the street, eliciting some very alarmed glances from the citizens of Ponyville. Thick was one thing, but this?

“That pony isn’t going to be able to move at this rate.”

Author's Note

Finally managed to reorganize some events and make a more coherent story progression.