Suggestion: Ruby and Weiss's Big, Fat Dust-Up (Breast Expansion, RWBY)

A light breeze blew through Beacon’s courtyard, rustling Ruby’s skirt and tussling her hair. Sitting back on the bench, she kicked her legs and groaned restlessly, wondering if her day could possibly get any worse.

She was soooooo bored. Booooooooored. Bored. Boooooooored. Yang had gone for a bike ride, Blake was busy in the library, and Weiss had yet to return from her trip home, so there was no one around for her to do anything with. Boooooored. 

“Hi, Ruby,” said Jaune, strolling past. “Are you all on your own? Me and Pyrrha are about to go training together, if you want to come with us?” 

“Ugh, pass,” said Ruby, spinning on the bench till she was upside down. 

Jaune shrugged. “Suit yourself.” 

As he left, Ruby kicked her legs and stared into the sky, picturing herself tumbling from the bench and up into the clouds. If gravity were reversed, could she fall all the way out of Remnant? How would she have to fall if she wanted to land on the moon?

Bored… Bored…

Bore…?

Just as she was about to accept that nothing would ever arrive to entertain her, her upturned gaze happened to catch sight of something that flipped all her switches.

The wheels of Weiss Schnee’s suitcase grumbled as they rolled across the flagstones of the courtyard. The heiress tugged her luggage along with a degree of paranoia normally reserved for amateur drug smugglers, flicking her eyes left and right and wincing each time someone came near her. She looked like she’d explode if someone so much as tapped her shoulder.

A mischievous smile split Ruby’s face. In a flurry of petals, she left the bench and zipped across the courtyard, coming to a stop right beside Weiss, her hands behind her back, leaning forward curiously. “Hiiiiii, Weiss. I didn’t expect to see you back from your trip so soon!” 

“Ruby!” Weiss jumped–almost literally. “I… I was able to catch an early flight.” 

“What have you got there?” said Ruby, peering at her luggage. 

Weiss put herself between Ruby and the suitcase. “Nothing,” she said. “Just some new clothes.” 

“Not more experimental Dust?” said Ruby, quirking an eyebrow. 

“No, it is not more experimental Dust! As a matter of fact, it’s none of your business at–Hey!” 

Zipping past her, Ruby knelt beside the case and input the combination (1-2-3-4-5–the same one Weiss always used for her luggage). With a click, it snapped open, revealing a plethora of colorful Dust capsules. Ruby’s eyes practically sparkled in delight. 

“Ruby! Ruby, don’t you dare! Ruby!” 

Too late. Ruby had already snatched one of the capsules out of its slot and raised it to her eyes for better examination. “Ooo, what kind of Dust is this? I’ve never seen it in bright pink before!” 

“Ruby! Ruby, give that back before you break it! These are highly unstable samples! They’re not meant to be juggled!” She made a grab for it, but Ruby simply darted out of her reach. 

“I’m being careful!” she said, cradling the vial to her chest like a small animal. “And you didn’t answer my question!” 

“It’s cosmetic Dust!” Weiss stamped her foot. “Now put it back in the case before you break it!”  

“Cosmetic Dust? Wow, I didn’t know they made cosmetic Dust.”

Weiss grit her teeth. “I told you, it’s experimental. Now put it back where it belongs.” 

Ruby’s smile drooped like a moldering banana. “Okay…” she said at last. “I’m putting it back.” She took a step towards the case–

–and tripped on an uneven stone. Her eyes went wide as the capsule flew from her hands.

“Ruby!” 

The vial struck the ground with a crash and exploded with a thoom, producing a miniature mushroom cloud of sparkling pink Dust. Ruby leapt to her feet in surprise, and together she and Weiss stumbled back, coughing and spluttering. Even as the Dust faded, the two of them remained covered in a light frosting of the glistening pink stuff. 

Weiss was the first to recover. Gritting her teeth, she raised her hands like she wanted to wring Ruby’s neck. “Look what you’ve done now!” 

“I-I didn’t mean to–!” cried Ruby, throwing herself to her knees and snatching up the shattered fragments of the Dust vial in a vague attempt to put everything right. 

“You’re incorrigible!” cried Weiss. “What am I supposed to tell my father now?” 

“I–” Ruby stood, working her jaw as she fumbled for an answer. The shards of the vial dropped from her hands, clattering as they struck the stones. “I– Weiss, I’m so–” No matter how hard she tried to speak, the words refused to come. Her lungs ached, as if empty, and her heart thudded as if she were in the middle of a tense exam. What was wrong with her? Things weren’t that bad, were they? It was only a vial of Dust. Weiss could replace it, couldn’t she? 

Whether it was guilt or an oncoming heart attack, she couldn’t tell, but the feeling soon settled in her chest as a painful knot, halting her breath and making her squirm in discomfort. She clasped her breast, breathing hard, her face flushed. It felt like she was about to blow up. 

Belatedly, she realized Weiss had stopped insulting her. Screwing up her eyes, the Schnee heiress clutched her own chest, sweat dripping from her forehead. Her legs shook as if she’d collapse at any second. 

The Dust dappling their bodies sparkled in the early morning sunshine. 

With every passing moment, the tension in Ruby’s chest grew greater, growing till it felt as if something were trying to claw its way out of her. Clasping herself in a great hug, she doubled over and moaned, her entire body shaking with exertion. Around them, other students stared in concern, clearly wondering whether to call a doctor. 

Fighting the pain, Ruby succeeded in parting her arms to get a better look at her chest: revealed, the bodice of her combat dress trembled, visibly straining to hold something in. Even as she stared, eyes wide in shock, the first seam split with a rrrip. 

Heart pounding, Ruby raised a trembling hand and placed a finger on her breast, as lightly as possible. And screamed as the greatest pleasure she’d ever felt tore through her. 

It was like she’d unlocked an overladen closet: with a snap, her bra broke, and with an awful tearing sound, her boobs ripped through her bodice and spilled out into the open in an endless deluge of titfat. Screaming, Ruby grabbed them, struggling to hold them, and screamed again as her hands sunk into her hyper-erogenous flesh. Oh Dust, there was so much of them–it was like holding a pair of pillows. Her legs trembled, straining to hold her up. 

Beside her, Weiss Schnee moaned. Ruby’s eyes snapped to her fellow huntress’s chest just in time to see her own boobs spill out of her bodice, flowing over its neckline like dough out of a baking tray. Stumbling, Weiss grabbed it, her face flush, moaning as she struggled to push it back in, but the growth was ceaseless–it was like trying to empty the ocean with a cup. 

“W-Weiss?!” cried Ruby, straining to lift her egregious new assets. “What kind of Dust is this?!” 

“RUUUUBY!” Weiss hugged her chest even tighter, gritting her teeth and throwing Ruby a gaze so fierce it could have melted steel. “Ruby!”

Ruby quailed. “I’m sorry! I’m sorry!” She tried to back away, but her swollen chest had thrown her completely off balance. Fortunately, Weiss’s hands were too full to slug her. 

“Holy crap! Look at their tits!” cried someone in the crowd.

Ruby and Weiss froze as they remembered where they were standing. The Academy’s courtyard wasn’t normally busy at this hour, but it was busy enough for a small crowd to have gathered around them, staring and taking pictures on their scrolls. The feeling of their eyes–all forty plus of them–roaming over Ruby’s chest made her want to melt. “Weiss, what do we do?!” 

With a flustered snarl, Weiss turned and marched away as fast as her new boobs would allow her, having apparently decided preserving her dignity was more important than preserving her luggage. Ruby hurried to follow, her bloated new breasts threatening to drag her down to the ground with every step. It felt like carrying Zwei–no, two Zwei! Vier! Within twenty meters, she was red-faced and panting. “Weiss, wait!” 

And their new assets’ weight wasn’t their only distracting feature. Each time she took a step, they bounced in her hands, their rise and their fall like a little orgasm in itself. Flushing, she bit her lip and tried to block it, but the feeling of her nipples hardening in her hands was impossible to deny. 

Weiss led them into the academy proper and from there into the nearest restroom. “GET OUT!” she screamed at an unfortunate Velvet, who fled without a word. Slamming the door behind them, Weiss hauled her new boobs over to the sinks and planted them on the porcelain as she rummaged in her purse for her scroll. 

Carrying her own breasts over, Ruby planted them in the sink beside her, shivering at the feeling of the cool porcelain against her skin. When she saw herself in the mirror, she couldn’t help but blush–never, not in her wildest fantasies, had she ever imagined she’d grow so large. Yang’s size, maybe, but nothing like this. How was she supposed to fight Grimm like this?! 

“Hello?” Weiss had her scroll to her face now. “Hello? Yes, of course it’s me. I– Look, I don’t have time for idle chitchat–this is an emergency! Lot 34! I need information on Lot 34! Yes, that’s the breast expansion Dust! I– No, I don’t care about the composition– I want to know how to reverse the effects! What? No, don’t put me on hold!”

As Weiss screamed at the person on the other end of the call, Ruby turned her attention back to her reflection and the ridiculous sacks of flesh dangling from her torso. They filled the sink and then some, flowing over the sides of it and threatening to sag all the way to the floor. Automatically, without thinking, she wrapped her hands around them and squeezed them, trying to fit it all back in–only to end up squealing as her fingers sank into her skin and a spear of pleasure lanced her from nipple to groin. “Nnn~! Ah! Oh Dust!” 

She slammed her legs tight, unable to ignore the fire raging in her groin. Breathing hard now, hard enough to fog the glass, she massaged herself, whimpering as her fingers slid over her soft, pliable flesh. There was so much of it–she’d never be able to fit in a bra again. 

Her fingers reached her hands. She hesitated for a second, conscious of Weiss still screaming at her scroll beside her, before wrapping her forefingers and thumbs around her fat, sensitive nipples–each almost as large as a hand itself–and pinching them like she wanted to tear them off. 

Pleasure seared her. Screwing up her eyes, she lurched forward with a moan, resting her chin on the pillows of her own chest and whimpering as she tweaked her nipples even harder. Spasm after spasm of erotic energy passed through her, making slam her thighs tight as juice slipped down her legs. Nnn~! Why did it feel so good?! 

She fought for control, but the feeling of her fingers digging into her flesh was simply incomparable. It might even be worth it, a part of her couldn’t help but thinking. It might actually be worth the hassle of having a pair of monstrosities like these, if it meant she got to keep groping them. 

A sudden spike of sanity snapped her to her senses. With a gasp, she snatched her hands away from her breasts. No! She couldn’t stay like this. How was she supposed to become a huntress with breasts like this?! She’d never be able to fight, even if she could ignore the pleasure. She’d have to drop out of Beacon, find another career… What options were even open to a girl with boobs this huge? She didn’t even want to think of it. They had to reverse it! They had to!

Weiss moaned like she’d been stabbed. “What do you mean it’s permanent?!”