Winter is in full swing. Across the skies of Ponyville, thick grey clouds pour out a torrential flurry of snow. The holiday season was finally in full swing, with Hearth's Warming Eve not that far along. All around town, ponies celebrated the holiday season.
 
As for you, you continued your work as Rarity's assistant. After that one incident in her private modeling room, she's become more accustomed to you as a companion rather than an employee. She's even offered you a spare room at her boutique. It had taken some time, but with her help, you cleared things with your old landlord and are now comfortably settled in with her.
You couldn't be happier for it.
 
It's late in the evening, the setting sun casting an orange haze through the windows. You and Rarity are tidying up the dresses on display before the two of you turn in for the night.
"Ah...Such delightful pieces, wouldn't you say?" trilled Rarity, "I cannot wait to see these at the Hearth's Warming Festival." She struts around the display, her heavy figure putting an exaggerated sway in her steps.
Cold sweat beads at your forehead as you watch her. "Oh, and I'm sure you can't wait to see all those mares with these on...showing off their luscious curves~." You shake your head tentatively. You've only got eyes for her...and her assets.
Rarity giggles. "Oh, don't you worry! As long as "assets" stay in season, you won't have a lack of these!" She accents her point with a firm slap to her belly, which had grown rounder and softer since the holidays began. "Come, let's retire. We've much to do tomorrow, and we could use the rest."
You couldn't agree more. With the displays all set, the two of you head back to the den for an evening of relaxation.
 
Soon, you're cuddling with Rarity on the couch. The lights are out save for the fireplace, warming the room and throwing flickering shadows across the walls. The two of you nurse a cozy hot mug of cocoa. As Rarity sips her drink, you idly rub her tummy, listening to her hum at your touch. She's carried her new weight rather well. Her flanks and thighs have a fine roundness to them, and her cheeks are adorably puffy, especially when she smiles. The real prize, however, is the great alabaster dome in your arms. When she stands, her belly hung almost to her knees and bulged out at the sides, yet showed no signs of sag. She's started to look more and more like an overpuffed marshmallow, and you love every soft, smooth, delectable inch of her.
 
"Mmm...I can't believe I'm saying this, but I'm going to miss all this..." Rarity moaned, a hoof cradling her fat tummy, "In any other circumstance, I'd want nothing to do with such excesses as this...but you..you relish this..."
She brings her mug to her lips, only to find her sipping on air. "Oh bother...Could you be a dear and fetch me some more cocoa?" You get and head to the kitchen, pouring another steaming cup of cocoa. But as you pour the drink, a thought struck you (not an original one, but a good one). Reaching into a nearby cupboard, you withdraw a bag of marshmallows.
 
You return to the den and cuddle up next to Rarity again. She makes a mock-aghast face as you present the marshmallows. "Oh sweetie, really? Two mugs of hot chocolate and now this?" A hand on her belly silences any further protests. She practically melts as you massage her pearly gut, and you feel the warmth from the cocoa in her stomach. Your fingers sink into her softness, each squeeze making her moan sensually.
 
Soon, she's finished with the cocoa, the mug placed aside on a coffee table. "Mmnnah...Now...those..." gasps Rarity, so relaxed she could barely think straight. Eagerly, you pick out a marshmallow and pop it in her mouth. The sweet morsel muffles her moaning,
and her puffy face is all scrunched up in a silly grin. You pass the bag to Rarity, asking if she'd rather have two hands on her. "Ah...that sounds...wonderful..." she pants, her horn flickering to life. Eagerly, you grab hold of her tummy, rhythmically pressing down across the smooth, supple surface. At this, Rarity seemed to snap, and she shoves her muzzle into the bag, munching down on the marshmallows. "Mmf! This whole bag...will do terr-ah-rible things to my waist...and you love it!" She gulps down the next sticky mouthful and starts panting, her hot expressing matching your own. "Come on, darling~. I, ah, know you love all this. You love my new figure~! You love my wide flanks, my chubby cheeks~..."
Her hooves grasp her middle, squishing down into its doughy mass.
"And best of all...my huge...soft...swollen...marshmallow tummy~!"
 
You've done your best to suppress your boner, but now there's no stopping it. The wily grin on her face shows she knows. "You've been a very good assistant, and I intend to reward you...with all my 'assets'..." At this, she heaves herself from the couch, her legs trembling to compensate for her heavy tummy. "Come with me~..." You need no convincing. Guided by your crotch compass, you follow Rarity to the bedroom, her plump ass and belly bobbing and swaying seductively.
 
As you reach the bedroom, something suddenly tugs at your clothes. You nearly fall to the floor as Rarity's magic sends them flying across the room
"Now, darling..." she says with a seductive purr, "Show me how much you love these curves~." With a grunt, she pulls herself onto the bed and rolls onto her back, presenting her huge milky-white stomach. Grinning, you drop to your knees, bringing your face down to her belly. Your hands run across its silky surface, your hot and heavy breathing sending shivers down her spine, making her belly quiver at your touch.
"Nnf! Yes..yes!"
You start planting kisses across her belly, practically mashing your face into her warm chub. Rarity's moans grow louder, and your hands grip her belly harder.
"Tha...That's enough! Get in me! Now!"
All you needed to hear. Practically pouncing her, your dick runs Rarity through, her belly cushioning the impact. Your lips lock immediately as you start thrusting, hard and deep.
"Yes...YES! RAVISH ME LIKE YOUR FAT LITTLE STRUMPET~!"
Gripping her wobbling belly for dear life, you pound her harder and faster. Your vision blurs, stars streaking across your vision. Rarity screams as both of you hit climax, your seed exploding into her pussy while her marecum splashes onto your crotch.
 
After that sudden display of carnality, the two of you lie there, you resting atop her belly, now damp and slick with sweat. You feel yourself subtly rise and fall with her breathing, as her pants make her belly heave up and down. Eventually, you slide out of her, curling up beside Rarity with an arm round her tummy, cooling her off with bellyrubs.
"Mmmh~...Well, I dare say...you convinced me..." Rarity says after a long pause, "Perhaps I'll keep all this fluff...At least until the next summer." You give her belly a gentle squeeze, silently voicing your approval and making her giggle. "Oh, you're simply incorrigible!" she says with a laugh. Chuckling, you then pull yourself closer, hugging your plump marshmallow tight. "Mmm...Goodnight, dear Anonymous..." Sleep soon finds you both, the cold of the winter evening warded off by your pillowy marshmallow pony.