Marshmallow Wars (Rarity, Sweetie Belle, BE, GTS)

 

"You really should stop, Sweetie. There's absolutely no shame in being smaller. After all, you ARE my little sister."

 

"Ha! Are you sure about that, 'big sis'?"

 

Curiously, the dozen or so marshmallows that Sweetie had eaten over the past week had caused additional changes to the ones her sister had experienced. While her breasts had puffed up into prodigious pillows the rest of her had played catch up with her 'big' sister. The teenager had shot up tall enough to look Rarity in the eye and the increased curves she sported below her soft, small belly certainly gave her older sibling's a run for their money.

 

Not that Rarity's lower half hadn't benefited from the effect of so many mallowy treats either. The fashion designer's hips, which had always been rather slim, had widened well past her shoulders and her backside had attained proportions that could only be described as 'Daaayuuumn!'. She was pleased to note that her tummy was still relatively unaffected by all her changes, though it had gained a pleasant layer of pudge, just enough to soften her midsection up a bit.

 

Now both sisters tensed, waiting for the other to make a move.

 

"Where'd you get yours?" Sweetie indicated the pan of treats next to her rival.

 

"Spikey Wikey gathered the mallow plants for me and Pinkie made them."

 

"Ha! You're always making Spike do stuff like that for you. I hope you at least thanked him properly."

 

Rarity smiled and took a deep breath, shaking her tremendous ta-ta's back and forth, "Oh I think he was quite happy with his reward. How about you? Where did you get yours?"

 

"Apple Bloom helped me get the plants and we made them together."

 

"And you didn't burn them? I'm shocked." Rarity snarked.

 

"Oh, that is IT!" Sweetie Belle snatched up a marshmallow and ate it in two bites.

 

Rarity retaliated by grabbing one of her own confections and wolfed it down. Both young women glared at each other as they started munching their way through the trays of treats, a look of madness in their eyes brought on by their escalating rivalry.

 

Finally finishing them all off, Rarity and Sweetie Belle panted and smacked their lips as they swallowed the last of the sugary remains in their mouths. Then, with a slowly dawning sense of horror, sanity returned to the sisters and they realized that they had just consumed three times the number of marshmallows in the last few minutes then they had in the past week.

 

Before they could do anything though, their stomachs began to rumble. A horrible bloating sensation overwhelmed them and their breasts began to tingle. Both Rarity's and Sweetie Belle's boobs started to billow out gently, quickly gaining size and mass.

 

"What do we do Rarity?" Sweetie whined as her sun-dress, custom made to contain her once M-cup boobs, began to tear along the seams.

 

"I don't... I don't know!" Rarity gasped as her own dress started to fail.

 

By this time their prodigious paps had puffed up to the sized of beanbag chairs. Amazingly, each blimp-like bazoom was still full and round, projecting out several feet in front their owners. Because of their family curse, or perhaps in spite of it, both ladies were still able to stand upright despite their massive mammaries.

 

By the time their respective racks had reached below crotches both sisters realized that their boobs weren't the only things changing. The room seemed to start shrinking as their limbs started to lengthen. As though to make room for their increasing bulk, each female's body was growing bigger right along with their sweater puppies. It only took a few minutes before the rest of their clothing, panties included, snapped off their burgeoning bodies.

 

Carousel Boutique had high ceilings, but Rarity didn't want to risk her shop and she beckoned for her sibling to follow as she waddled over to the door leading outside. Unfortunately, by the time she got there, each one of her gazongas had grown to six feet across which, combined with her bulky backside and imposing new height, made getting out impossible. She slumped down on the floor in defeat, her prodigious pontoons coming to rest on the carpet beside her legs.

 

Sweetie meanwhile was pacing around nervously, thinking of a way out. The girl's jumbo juggs jutted out a firm nine feet from her upper chest. Despite their surprisingly round shape the only reason she was able to still able to move with such whopping wobblers was because her head was scraping the 18 foot high ceiling.

 

She looked in a mirror and caught a glimpse of the only part of her still visible in the full-length glass: her exposed, massive ass. Her thighs too looked like they belonged to a primeval fertility goddess. Desperately, she felt up along up huge hips.

She sighed in relief when her hands dipped in, indicating that her waist was still relatively narrow. Which, she realized looking over at her gigantic sibling, was probably a silly thing to be worried about at the moment.

 

By the time Sweetie's growth forced her to join Rarity on the floor, their expansion was slowing noticeably. A few more minutes and it was all over.

 

Rarity hesitantly reached a hand up to the ceiling. She could just barely brush it sitting down. Both sisters looked at each other in amazement. Just how big were they?

 

However large they were, their titanic tits were bigger. Each pair of breasts extended so far out that they nearly reached their owner's outstretched feet!

 

Curious, Sweetie rubbed her soft mounds. Each enormous mountain of flesh was so swollen and full that it was at least as tall as she was sitting up, but as she felt them, they gave way with a springy softness.

 

Like a marshmallow, she though in wonder.

 

Sweetie looked over to tell her sister about her discovery, when she saw that Rarity was busy feeling herself up as well. When they looked at each other they started giggling, finally succumbing to the absolute absurdity of the whole affair.

 

"I'm sorry I was so jealous, Sweetie." Rarity said.

 

"Ah, I'm sorry too, Sis. I shouldn't have tried to show you up."

 

"You know I..."

 

At that moment, Spike walked though the door, "Hey Rarity I... Urk!"

 

Thump!

 

"Wow Rarity, I think you gave him a heart attack!"

 

---

 

 

"So they're just staying put for now?" Applejack asked.

 

"That's right," Twilight responded. "Don't worry, Spike's more than happy to take care of them."

 

"And it's just until you can find a counter to their curse, right?"

 

"Oh, I found the counter-curse in Glockenspiel's 'Hex Infirmus' yesterday."

 

"Then why haven't you used it on 'em yet?"

 

"Well, because I think they both need to learn a little lesson in not abusing curses."

 

Applejack looked at Twilight intently. Then her eyes narrowed accusingly.

 

"Is that all?"

 

"Um, er, well..." Twilight looked at the ground, "Spike maaaaaay have bribed me with an incredibly rare book that he got on his last trip to Canterlot."

 

"I see."

 

"You won't say anything will you?"

 

"Twilight, my lips are sealed."

 

The End