"A Hearth's Warming Ball! In Ponyville!"
Rarity was ecstatic. Between the success of her new winter designs and learning of the Ponyville Hearth's Warming Ball, she could barely contain her excitement. The two of you were getting ready to leave for the ball, you dressed in the fine suit Rarity made for you. There was some difficulty in making an outfit that wasn't for a pony, but Rarity was able to work something out and made you something both stylish and comfortable. Your outfit was modest, a plain black suit and a red tie, the stereotypical Anonymous couture.
Rarity, meanwhile, had designed herself a dress that was the antithesis to your plain suit. The outfit drew inspiration from the winter holidays, much like the rest of "Frolicking Flurry", though hers was much grander by comparison. The colors evoked the image of a blizzard, the silvery dress sparkled with pearls and white jewels, and her mane was adorned with a snowflake-shaped pin. And, of course, the contours of her outfit accentuated the lovely curves she'd gained over the season, from her shapely round flanks to her huge, bountiful belly. Her dress made it for all the world to see that she was in the spirit of the holidays.
 
After slipping into your suit and pinning the little snowflake pin Rarity made onto your tie, you hurry down the hall to her dressing room. Peeking inside, you see her in front of the mirror, posing in her ball dress. Her eyes flick back, seeing you at the door.
"Ah, there you are!" she trills, "How is the suit treating you?" You tell her it fits perfectly, commending her craft. "Why, thank you, darling," she says with a dainty smile, "I always aim to please my clients." Her horn lights, and a glittering white ribbon floats from a nearby shelf. With a flash and sparkle, the ribbon tied itself neatly around her waist, hugging her belly. "Consider this your Hearth's Warming present, darling~." she purred, a smug smile on her face as a cold sweat broke across your brow. "But that's enough playing around for now," she said, "The Ball will begin soon and we musn't be late!" You tried to regain composure, wiping the sweat from your brow as Rarity strutted out of the room. "Come! A carriage for us should be here soon!"
 
As the two of you make your way downstairs, you ask why she went out of her way for a carriage for just a short ride across town. "Anonymous, darling, do you really expect me to trudge through the cold in my latest, greatest creation?" Rarity says haughtily, "Not to mention I was invited as a guest of honor. I must look my best from the moment I enter to the moment we depart." She then flashes you another racy smile. "Besides, you'd have a nice, comfortable pillow to keep you warm on the ride." You try to stay calm, and keep following your plump date. The boutique's door flew open, a chilling breeze blowing over you and Rarity. Outside, a white and downright toyetic carriage stood outside, pulled by two coachponies. "Ah, there you are, Miss Rarity," called one of the carriage-drivers, "Hop right in, the Ball's opening soon!" Hurrying to get out of the cold, the two of you climb into the carriage. With a shrill whinny, the drivers pull away into the snowy streets of Ponyville.
 
Inside the carriage, you admire the scenery passing by the windows. Great piles of snow cover every rooftop, and festive banners and flags fly from house to house. Snow-ponies of every shape and size line the side of the road, every door bore a wreath, and every windowsill was lit by candles. Though the winter evening was bitterly cold, you were kept nice and warm from the portly pony snuggled up against you. You smiled as you reached an arm around Rarity and gently hugged her, while your other hand rubbed her belly. Rarity purred, burying her face in your chest. "You've been such a gentlecolt...or gentleman, whatever you call it," she said with a sigh. Her compliments soon devolve into soft "thank yous", her train of thought derailed by your wonderful bellyrubs. As Rarity slumps onto you, your thoughts turn inward. You begin to think of what the future would be like for the two of you. You certainly fancied her in the time you first started working for her, even more so once she began her winter line. She knows your tastes, and though she's sometimes loathed the thought of being overweight, she's taken it in great stride with your help, and with the success of "Frolicking Flurry". Despite all that, you're still unsure of her. There has to be something else...
 
Your ruminations are interrupted by the sudden bang of the carriage stopping. "Here we are, everypony!" the lead driver called. Rarity stirred awake, bolting upright.
"Ah, at last!" she exclaimed, "Anonymous, would you be a dear and help me down?" With a smile, you hop out of the carriage, then opened the door on Rarity's side. You take her hoof, letting her step out and present herself in her full glory. "Well, Anonymous?" she said, fluttering her eyes, "Shall we?" You nod, grinning like a fool. Taking your place by her side, the two of you stroll up to the town hall and into the Hearth's Warming Ball.
 
Ponyviile's town hall was a glorious sight. From the outside, it had been decorated in such a way as to resemble a great Hearth's Warming tree, decked with bright green banners and an assortment of other decorations in bright red, gold and silver. The inside had been converted into a modest ballroom, with a great decorated fir tree as the centerpiece, and lanterns hanging above bathing the room with a warm glow. Ponies from all around town, some even from across Equestria, were in attendance, all in various forms of fine attire. Rarity could barely contain her glee as she spotted some heavyset mares wearing her "Frolicking Flurry" designs.
 
A short crier pony stepped up and shouted, "Announcing our guest of honor! Miss Rarity and her plus one!" Ponies all around the ballroom clapped their hooves as the two of you stepped in. You meekly waved back while Rarity beamed with pride, striking a pose for the crowd. You could see just how proud Rarity was with each stance showing off her massive curves. She would definitely be the toast of the evening. "Come, Anonymous. Let's greet the other guests." You fall in behind, following Rarity into the crowd.
 
The two of you had a wonderful time once the ball got going. Rarity had a spirited reunion with her friends, who she'd sadly estranged herself to while she was working on her newest line. You had heard that Pinkie Pie had put on pounds to promote Rarity's new dresses, and now wore a custom piece Rarity had made her for the Ball. While she was nice and shapely, like the other mares in attendance who wore Rarity's new outfits, they all paled in comparison to Rarity herself. After several conversations with the other guests, Rarity rejoined you on the dance floor, where the two of you enjoyed a long, lovely waltz. Despite her heavy stature, she moved like a graceful swan.
 
As the evening wore on, everypony soon gathered at the tables for a Hearth's Warming feast. A wide assortment of winter treats adorned the tables, looking like something out of Harry Potter. Sumptuous cakes and other sweets abound, along with many baskets of breads, hay and fruits. Bubbling pots of soups and stews bathed the room with steam, carrying the sweet and savory scents of mixed vegetables. Rarity had already served herself a generous portion, as well as everyone close to her. Rarity immediately dug in, and you make the effort not to ogle her, instead focusing on your own meal. The feast itself was delectable, with many of the treats provided by Ponyville's chief culinary authorities, particularly Sugarcube Corner and the local Apple Clan. You had your fill after two plates, consisting of some apples, a bowl of stew, and a few slices of cake. Rarity, meanwhile, continued to chow down, your eyes drifting down to her belly beneath the table. You expected that whatever dalliances you had in the past would be put to shame by the end of tonight.
 
As Rarity finished her last plate, she slumped back in her seat, her hooves cradling her stuffed tummy. You scoot over, a hand already rubbing away. "Mmf...They have really...outdone themselves with all this..." Rarity panted. Of course, her dresses for this season were made with this sort of celebration in mind. Though she was stuffed to the gills, her dress showed no signs of strain against the bloated gut it contained. Nevertheless, she was tuckered out from tucking in, and was just about ready to drift off into a blissful food coma.
 
After the feast, the tables were cleared, the mayor of Ponyville rose and walked to the center of the room. "Fillies and gentlecolts," she began, smiling warmly, "Guests from abroad and from home, we hope that you've enjoyed our Heath's Warming Ball. Know that tonight we celebrate the spirit of harmony and friendship that our fair land of Equestria was founded on, and that we commemorate our continued peace and prosperity we have enjoyed over these many years..." Across the tables, ponies looked to each other, hugging one another, couples kissing. You pulled yourself closer to Rarity, a warm smile on your faces. "So, as mayor of Ponyville, I wish you all a happy Hearth's Warming, and look forward to another year of love and friendship for all!"
 
Cheers erupted from across the room, bells ringing and, seemingly out of nowhere, an orchestra began playing that familiar Heath's Warming carol. All ponies in attendance rose, and sang as one. When it was over, another cheer spread throughout the room, signaling the end of the Hearth's Warming Ball.
 
"Well, darling," Rarity whispered to you once the cheers settled down, "I believe it's time for us to retire." You agree with a smile, helping Rarity to her hooves, and escorting her out of the town hall among the throng of departing ponies.
 
When you had at last returned to the boutique, you carried up to the bedroom, still tired from her heavy meal. Once there, you try to lay her on the bed, but then she stops you. "N-no. I can stand. Put me down." Gingerly, you lower her to the ground, letting her stand. Her legs quivered, making you worry she'll fall. Thankfully, she keeps her balance. Then her horn lit up, casting a blue aura around her dress. "Anonymous...if you would do the honors?" she asks, looking back at you with lustful eyes. With a knowing smile, you grab the ribbon tied to her back, and with a ceremonious tug, pull it off in a single yank. Satisfied with your showmanship, Rarity casts her spell, instantly disrobing herself in a bright flash.
 
You can now fully appreciate what the evening has done to her figure. She had put on quite a bit more weight since your last documented misadventure. Her flanks were like great cushions, and her rounded cheeks framed her seductive grin. In the middle of it all was that great, swollen belly, now bloated even further and nearly reaching the floor. Your boner stood at attention as she shook her rear provocatively.
 
Rarity pulled herself onto the bed with a grunt, rolling over and presenting her nearly spherical belly. You move in slowly, but then her hoof shoots up, stopping you. "Ah ah ah." she tuts teasingly, "There's still one treat left for us..." Her horn flashes again, summoning forth a hitherto unknown brass pot "Pinkie was able to smuggle out some of the melted chocolate for the ball's smorgasbord. I figured you'd like some extra filling for your marshmallow~." All you could do was nod stupidly as her magic popped the top of the pot open. A ladle dipped in and scooped out a big spoonful of thick chocolate, which she slowly sucked down with a moan. You watched her expectantly, your dick threatening to burst on its own. "Ah, but who am I to deny you your fair share?" she purred. At that, she began to drizzle chocolate all over the top of her belly, the syrupy brown sweetness oozing down the sides of her gut and pooling in her deep bellybutton. "Go ahead, enjoy~!"
 
You needed no further convincing. In a flash, you were on top of her, sensually licking the chocolate off her belly. As you slathered your tongue across her chocolate-coated tummy, Rarity grabbed a hose hooked up the the pot, intended for use in a chocolate fountain, and plugged it into her mouth. She started sucking the stuff down, and you could feel her belly subtly swelling out with each mouthful of chocolate. You finished lapping up the chocolate round the sides of her belly, then planted your lips around her navel, sucking what was left out of the deep pit of her bellybutton.
 
"Mmmm..mmmm...MMMM!"
Rarity's moans and bloating belly drove you to new heights of lust. Unable to bear it anymore, you slammed your hips against Rarity, going balls deep into her soaked pussy. Rarity nearly gagged on her chocolaty drink, yet kept the hose held in her mouth as you started to thrust. Her belly jiggled with each twitch of your crotch, sloshing from the sheer volume of sweets therein. Your hands locked to the swollen white mass, squeezing hard as you pounded her tight snatch. Rarity, unable to take it anymore, spat out the hose, gasping for air. "Oh! Ah! Anoneeemous! I-I'm~...!" Whatever she was about to say was lost in a wild scream of ecstasy as both of you hit climax, your seed rocketing down her love tunnel amidst a torrent of her own marecum.
 
Exhausted, you collapse next to Rarity, resting a hand on her sticky, chocolate-stained belly. Rarity herself purred, her hooves rubbing the huge white hill in front of her. "Hmmm...this was...lovely..." she mumbled, her drowsiness coming back in full force, "Anon...thank you so much...I..Love you..." At that, she's out stone cold, a smile on her face as she drifts to sleep. You pull yourself closer, nestled against your stuffed marshmallow. The sheets would have to be washed, and Rarity would need a luxurious bath to clean her chocolate-stained belly and face. But for now, you snuggle up to Rarity. Whatever reservations you had up til now vanish as you whisper "I love you" to your wonderful marshmallow waifu.