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CM: Yang/Weiss Giantess
🕑 Added 2025-11-13 17:19:53 +0000 UTCSlight schedule altering because I haven't figured out what to do with RWBY VR yet
Series: RWBY
Characters: Yang, Weiss
Contains: Weight gain, giantess TF
Commission
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Weiss had spent months working on her latest experiment. The idea to make some sort of elixir that would boost aura production had been a popular one. Unfortunately, no one had the means to experiment…
No one, except Weiss. With the SDC backing, she had all the resources she needed. Costs were further cut by only having her work on it. She was in the midst of her latest experiment when the door swung open.
“Yo, Weiss!” Yang exclaimed. She wasted no time in hovering over Weiss. “Working on a new batch? It almost done? Here, let me try it!”
The exchange had happened too quickly to stop it. Yang, proving her and Ruby were indeed sisters, snatched up a beaker of pink liquid and drank some of it.
“What is wrong with you?!” Weiss shot out of her seat and squared up to Yang. “How do you even know that was the final product? It could have been a waste container! It could have been toxic!”
Yang blinked. “Ok…but was it?”
The two waited in silence.
“I don’t feel stronger,” Yang said and flexed. “I also don’t feel like I’m dying.”
Weiss sighed and slumped back into her chair. She had been working tirelessly on this, and Yang’s entrance had agitated her. The spike of agitated energy subsided, and fatigue flowed back in. “I’ll rework the recipe and-”
Yang’s stomach suddenly grumbled. “On second thought, I feel a little bloated.” She rubbed her gut, which had gained a subtle softness. “Uh…yeah, maybe call an ambulance or-WOAHOOOOOUUUUURRRRRRPPPPP!”
A gasp of surprise turned into a room-shaking belch. After which, Yang seemed more relaxed.
“Ha! That fixed it…Weiss? What’s with the look?” Yang asked as Weiss stared wide-eyed at her. “And are you wearing your heels? You look a little short.” She squinted and couldn’t understand why Weiss seemed to get smaller by the second.
Weiss’s perspective was the opposite. She watched Yang’s head grow closer to the ceiling. The blonde’s height increased with each second. Her limbs and torso elongated, her body seeming to upscale as if she were naturally eight feet tall. Despite that, her eyes dragged lower to Yang’s breasts. They seemed to grow much more rapidly. They swelled like fleshy balloons and stretched her tank top. Beneath them, a soft mound of belly fat rose like dough. Additionally, her hips rolled out with soft mounds of fat that threatened to rip her shorts in two.
“This was supposed to enhance aura and physical strength,” Weiss murmured and looked at her workbench. “What here could have caused you to gain height and weight?!”
Yang grabbed her breasts and bounced them. “Wow, look at my girls.” She glanced over her shoulder. “Even my butt is huge. Heh, no way Blake’s can compare.” Yang smacked her ass and grinned. She took the increase in height and weight in stride. Plus, the uncomfortable bloating sensation faded the more she grew.
Yang’s height started to taper off after she reached ten feet tall. This was the limit the room had to offer, too. Her head was right at the ceiling, but she didn’t yet have to hunch over.
However, she wouldn’t fit out the door even if she did. Yang’s weight already surpassed the door’s width three times over. Her breasts were her most prominent assets. They had continued to grow until they were wider and thicker than her mattress. These were so large that Weiss could have lain atop one and have room to spread out. They reached so far that even her elongated arms struggled to cup their furthest curves. However, her arms would require their own adjusting, too. They hung with heavy slabs of fat that threatened to roll past Yang’s elbows. She felt their weight combined with her bust and pulled down on her shoulders, but thankfully, her belly offered support.
Yang’s gut sagged down to her knees. It was heavy and thick, forming two rolls. The entire mass of her gut was larger than one of her breasts, but their combined weight beat the singular glob. Yang slid her hands down and felt the curves and fold in the middle. Everywhere she grabbed was marshmallow soft but heavy like a weighted blanket. She got a little distracted in this. The fondling turned more perverse and bold.
It was her gut, so who would care?!
Her hands moved to her hips, which had helped shape a fat, boxy butt. It wasn’t as bubbly as some rumps, but it had incredible width and thickness. She smacked the cheeks a few times and chuckled. The sound reverberated in meaty WHAPS. Yang had expected sharper smacks, but this was nice. It was more percussive. She felt it fit her~
Yang’s form was rounded out with legs taller and wider than Weiss’s entire body. Maybe there was some strength boosting to the potion because Yang’s legs didn’t feel exhausted. Although that could be thanks to her scaled-up physique and natural strength.
“Give me a week or two and I’ll get used to this…” Yang trailed off and eyed the remaining elixir. “That being said, why not give me a little more to adjust to!”
Weiss seized the beaker and pressed it to her lips. She swallowed it all in one gulp. Yang’s earlier imbibing was a mere sip compared to what Weiss threw back. Her project might not have worked as intended, but that didn’t make it a failure. Yang was sure to be more intimidating, and her padding and curves would make her the center of attention.
Unless Weiss was much larger!
“This is my invention. So no one has more of a right to it than me! BOOOOOOOUUUUUUUUURRRRRRRRRRPPPPPPPPPP!!!” Weiss felt her belly groan before her height started to increase. She felt the new pounds flow across her like a river. It built in speed and momentum as she matched Yang’s size in seconds.
Yang was prepared to laugh this off with Weiss. She had intended to tease the girl a bit and probably see what more of the mixture would do. It would have been all in good fun, but her laughter turned nervous as Weiss continued to grow. Her friend grew until she had to hunch over, but her head and stooped back still rose to touch the ceiling. Her belly swelled and touched the floor. It expanded outward like a fleshy wall that encroached on Yang’s space. Yang reached out to brace her hand against it only to be pushed back. She still felt the softness enveloping up to her wrist, but there was still the force to shove her. This was atop Weiss growing wide enough that she was about to touch the walls on opposing sides of the dorm.
“Hehe…yeah, this is an impending disaster…huh.” Yang swallowed nervously before she waddled around Weiss’s side. She had to squeeze between her teammate and the wall to reach the door. Yang felt her butt and back fat squish against the flat surface. She tried to suck her gut in, but she still had to drag it against Weiss’s growing body. There was nothing she could do about her breasts. Those were squished firmly against Weiss’s body. Soft breasts pressed to even softer belly fat and eventual hip fat.
Yang opened the door and tried to squeeze through it. It wasn’t possible given her enlarged body. She managed to poke her head and one arm through before she could go no further. She wriggled a bit, and part of her right boob pushed free, but no more. The width of her shoulders was too broad to squeeze through, even if she were on her side. If that couldn’t be done, then there was no hope of getting the rest of her out. “I think it’d be a good idea if everyone evacuated!” Yang shouted. Thankfully, the building had started to rumble under Weiss’s weight, so people had already started to poke their heads into the hallway. A glance at Yang was enough to make a few run.
A shaking building and an inexplicably massive woman were by no means ordinary.
Yang tried to think of how she would join the evacuating students when she felt something touch her butt. “Woah!” She exclaimed and tried to look behind her. Her bulk blocked any visual, and whatever pressed against her prevented her from moving back.
It was abundantly clear that this was Weiss’s butt. It’s unseen mass pushed back like a bulldozer and pressed against Yang. Physics tried to push Yang through the doorway, but the passage was still too small.
“Hey, no pushing! I’m a bit too big for this!” Yang grunted before the wall and doorframe around her burst outward. Yang rolled into the hall and bumped the opposing wall with enough force to break it. “Ow…holy-” Yang was disoriented, but she looked at where the door to her dorm had been. It was clear where the wall had been broken, but the entire space was filled with two fleshy globs.
There was no time for jokes, even if Yang had a great one in mind. She was too tall for the hallway, and Weiss was about to grow into the limited space. There was no telling how wide her hips had gotten, or when her weight would become too great for the floor beneath them. So, Yang frantically crawled. Her bust and gut dragged against the carpeted floor, while her hips swung and bashed the walls. This caused further noise, which brought others into the hallway. They saw Yang’s massive state and frantic pace, so they were inspired to run in the opposite direction.
Until more walls gave way, and Weiss’s pale butt cheeks surged into the hallway. Her growth had accelerated in time with the evacuation. Some students reached the stairwells. Others utilized their training and aura to leap from the windows.
Either way, all the students and teachers had made it outside before the dormitory broke apart. In place was Weiss. She stood taller than the building had, and she continued to grow taller. Her height soared upward until it was higher than Beacon Tower.
Height was not all she boasted. Her width had become just as grand as the dorm’s had. Though the dorm had been a rigid structure. Weiss’s width was much softer and curvaceous. Sheer walls had been demolished by the outward rush and weight of supple flesh. The heiress stood proudly as her dust mixture had tremendous effects.
It wasn’t the effect she had sought after, but part of her thought this was better. She could smash entire hordes of Grimm with the width of her cheeks. Her weight would obliterate any that stood in her path.
And she looked gorgeous as well.
Weiss ran her hands across her belly. Fat fingers traced the rolls of an upper belly that was larger than an airship. The fat piled and swelled more by the second. It was all in perfect view as Weiss’s chest had not grown with the rest of her. That was fine. She enjoyed the supple and malleable texture of her belly fat. She teased and squeezed it before she noticed the second, larger roll beneath it. She had to stretch her arms out to reach it. Even with her increased stature and arms longer than buses, she failed to reach the furthest curves of her belly. All she could do was grope and squeeze it. She relished the feeling of fat as it bulged between her fingers. This indulgent act confirmed that Weiss continued to grow. She could feel more fat build and push against her hands without ceasing. It was clear that she had much more room to grow.
Her hips stretched further by the second. Fat surged and rolled over itself as rolls struggled to establish themselves. There was a cycle of rolls forming, merging, and dividing again. Part of this was due to gravity as it pulled on Weiss’s skyrocketing weight. A constant was that Weiss’s hips were coated in puffy, thick fat. It retained a basic amount of stability, but the furthest edges sagged and drooped until they hung to the middle of her thighs.
These hips helped to support the largest of Weiss’s assets. Her butt cheeks wobbled due to their rapid growth. The surface of the cheeks waved and rippled with the constant increase. A continuous wobble that couldn’t cease or settle. The cheeks grew taller just as they did wider, and they partially sagged like the apex of Weiss’s hips. They were rounded and mountainous toward the upper curves, and flabbier and slightly sagged toward the lower halves.
Weiss’s thighs had grown wide, too. This helped support her massive stature, but it was likely her body type that dictated their growth. Their combined width matched her hips. They were firmly pressed together, and so thick that Weiss couldn’t separate them if she tried. They rolled out in mostly barrel-like shapes, with the exception of some wavering toward the middle. This dip looked like it could become a roll eventually, but had yet to. It was still thick and bulging with fat. Muscle might have been buried somewhere deep beneath it all, but currently, Weiss was more fat than anything else. This gave her thighs a pure and luxuriously soft texture. Hefty fat and flab that jiggled with the slightest adjustment of her posture. The blubber rolled past her knees, sagging around all sides of the labored joint. Her lower legs were markedly smaller, but they were still as wide as the dormitory building. With girth like that, smaller meant practically nothing.
These sights that all of Beacon hardly meant a thing as those proportions were dwarfed after a few minutes. Weiss’s growth was simply that fast. Lower belly and lower body continued to surge out in tidal waves of fat as her height continued to climb. Her ass grew thicker, her belly rolled further past her knees, her thighs and hips spread toward the horizons. Despite all this growth, Weiss’s uppermost portions seemed little more than scaled up. Her arms were long and thick, far more than Beacon Tower, but that meant little compared to the rest of her grandeur. Her bust was negligible. The bounds that had grown there were like hills to normal people. To Weiss, they were hardly higher than they used to be. Similarly, her face had not developed excessively thick cheeks nor a double chin. That didn’t stop her from smiling eagerly as she grew.
Weiss certainly didn’t mind. The rest of her was enormous! She had so much of her body to enjoy. A belly that would soon crest mountains, an ass that could overtake the Emerald Forest, and thighs that would tower over cities. Weiss was in love with every part of her body, and she intended to marvel at every part of it.
The greatest part of all was that it didn’t seem like her growth would end anytime soon. She stood multiple hundreds of feet above Beacon, her width far exceeding its grounds, but she continued to grow taller and fatter…seemingly with no end soon to come.
Down on the ground, Yang stared at this and silently mused that it was a good idea she didn’t drink the rest of Weiss’s elixir. She’d probably get in trouble if she caused this amount of destruction.
“Yang,” Ruby had approached her sister. It was easy to spot the blonde in the crowd. Though Ruby’s expression was accusatory and judgmental.
“I didn’t do this!” Yang immediately launched a defense.
Ruby just crossed her arms and shook her head. “I don’t believe you.” She sighed and looked up at Weiss. “This is really gonna complicate our combo moves.”
THE END
