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This piece has ridiculous breast expansion and extreme hyper breast sizes, so beware!
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Ada was breathing hard. Really hard.

The head physicist would never imagine herself brisk-walking through this corridor at this hour with such fervent urgency, and certainly not with blaring sirens and flashing red lights all around her. She dabbed her forehead intermittently of her cold sweat that trickled slowly down her temples from her short blonde hair, an apparent indication of her current physical exertion as well as her welling nervousness.

“It’s too soon… It can’t be…!”, she spoke to herself with exacerbated breath.

Her clammy hands fumbled with her keycard in her breast pocket when she finally reached her destination, a large heavy automated metal door sealed by a locked access system. The large red light bulb flashed brightly above the metal plaque that labelled the place that Ada was about to step into: the Dimensional Containment Chamber. It took her another few agonizing seconds to get a firm grip of her access card and brought it to the scanner where it granted her entry with a green glow, hastily squeezing her way through the slim gap that appeared as the doors parted slowly with the whir of hydraulics.

The room that Ada just entered was one of the most impressive places in the laboratory, a large dome-shaped room the size of the football field and embossed in metal and glass. Rows upon rows of servers and electronic equipment lined the walls and floors of the chamber, with nearly twenty scientists and technicians scattered all over the room as they tended to the sensitive machinery. In the middle of the dome was something that was frequently hailed as the greatest achievement located in the entire facility: a series of giant tubes and power cords connected from the ceilings down to apartment-sized container encased in super-thick glass, referred to by staff of the lab as the ‘Miniature Universe’.

But Ada didn’t care for what was around the chamber or the marvel of equipment that was within. Only one thing was on her mind which was right in front of her: a small girl barely 1.5 metres in height who was standing in the glass container and wearing a white dress. Her frame was petite from her slim arms to her slender legs, and the smooth white fabric that wrapped her pale-skinned body contrasted against her silky black pigtailed hair. The only thing that was extremely bizarre was the huge mass in front of her that was seemingly attached to her chest and covered in grey satin cloth, appearing like a wall as it filled the container end to end.

This person was someone that Ada treasured dearly, as well as someone that she feared the most. She shared the same hazel eyes and pale pink lips as herself, and she was none other than her own little sister, Alice.

“What’s the current status?”, asked Ada abruptly to a scientist who was handling the main control panel.

“Not good, ma’am. The compression brasserie has already reached 90% capacity, and it has been increasing steadily faster the moment we placed her in…”, the scientist glanced at the monitor worriedly as he spoke.

“N-ninety percent?! But how? We just placed a new one over her just a few days ago!”

The scientist just looked at her with lost eyes, equally helpless with no answer. Ada bit her right thumbnail subconsciously while the worry in her heart grew.

Is she really growing that fast?

Her current predicament started merely a few months ago, when she saw her loving younger sister began her journey in high school. It was there when her family saw the astonishing progress that Alice’s breasts made as she went from being completely flat to outgrowing her own mother’s bra in just a week, and achieving the status quo of having the largest breasts in her school with her F-cups. Shortly after, Alice exceeded the normal standard of cup sizes by waking up to a pair of boobs that could double as beanbag chairs each, stirring great concern among her family members that she now had literally the biggest pair of natural breasts in the world. Despite that, Alice’s growth never backed down and instead accelerated its pace, swelling up to be able to crush buses with a single tit within the next day. The day after, her boobs could no longer be contained in the house and even encroached the neighbours’ lawnspace. Another day passed, and the entire neighbourhood disappeared under her breastflesh. Her own sister Ada, who was a leading physicist, was commissioned by the government to come up with a countermeasure for Alice’s burgeoning breasts before it causes widespread chaos to the world, and what she created as a result stirred great waves within the scientific community: a bra that contained a pocket dimension within, allowing for unhindered growth of Alice’s boobs and its containment without destroying the globe. A magnificent accomplishment even from the one who pioneered space-time manipulation.

Although the world celebrated her achievement, Ada and her team knew that they were only delaying the inevitable as the main problem still remained: Alice’s breasts were still growing. Her concerns were justified when her sister complained one day that her chest felt tight that led to the horrendous discovery that the dimensional bra had indeed reached capacity, a feat thought impossible by convention. Removing the bra was considered a terribly dangerous thing to do and hence the only choice that Ada had was to put on another dimensional bra on top of the current one, acting as a secondary barrier to contain any breach from the first pocket dimension. Since then, Alice had been wearing bra after bra continuously whenever her previous one reached breaking point, while Ada’s team cautiously watched her growth progress to predict her next bra-breaking moment.

But it seemed that there was some sort of miscalculation or misjudgement, because Ada was suddenly called in from her slumber regarding a ‘containment breach’.

“What was the last measurement of her growth rate?”, Ada fired off anxiously.

“The previous shift team had reported that Alice’s growth was estimated to be roughly 2000 googolplexes of exponential size multiplications.”, the scientist flipped through the report in his hand frantically, just as perplexed and nervous as she.

Shit, I forgot that we're at exponents now…, she thought with a heavy heart. Each exponent multiplication indicated that Alice's breasts were growing to double its previous size per second, and her growth rate increases exponentially for every multiplier value increment.

“2000… And what’s her growth rate now?”

“Um…”

She looked over at her sister while the scientist looked over his panel of instruments for an answer. In the midst of all the pandemonium that was spreading throughout the room, Alice seemed to be the only person that was not in a flurry of panic. Instead, she was fidgeting her fingers behind her back and fighting back the buckling of her knees as if she was holding back something. She looked over at her sister from the confines of the glass chamber to show her flushed cheeks towards her, the corners of her lips curling up in pleasure. It was very obvious to Ada that Alice was enjoying every moment of her immense breast expansion, well aware of the wonderful sensations that she shared about with her during every testimonial. And with the bra approaching its limits, it was no surprise that the imminent relief of size decompression would send much stronger waves of pleasure through her body than usual.

“Ah, got it! It’s...uh...shit…”

“Quickly, what’s the reading?”, Ada snapped at the trailing scientist.

“...it’s nearly a million googolplexes now…”

“Huh?!”

Ada looked down at the monitor and sure enough, the reading given off from Alice’s bra showed the incredible 7-digit numeral, and was rising rapidly with every passing second.

How is this possible? This kind of rate wasn’t expected to be until next month!

A loud groaning noise snapped Ada’s attention to the glass container, where visible blue sparks began to fly off the main central locking mechanism of Alice’s current dimensional bra. An audible gasp could be heard emitted from her lips.

“The bra’s 98 percent full! It can’t take much longer!”, the scientist exclaimed in a heightened pitch.

“Dammit, is the next dimensional bra ready?”, Ada yelled.

“The assembly team’s working as fast as they can, ma’am! They’re at full capacity!”

“Shit…”

Desperate measures for desperate times, she thought as she decided to do the unthinkable. Breaching the protocols of the lab, Ada ran down from the control panel and overrode the primary controls with her authorisation, forcing the container door open. The surrounding staff were too slow to stop the sister from entering the container without the designated special suit to be in the physical presence of Alice. There was a special reason why Ada’s sister was placed in this glass container and it was that the container was the only equipment in the entire world that was capable of freely manipulating space and time, designed by Ada herself. The space-time chamber has the ability to open new tears to access new universes and dimensions, of which enabled them to place Alice in a separate alternative dimensional space in the event that the bra does break. Ada took extreme precaution with every step taken towards her sister, as she wasn’t wearing any protective gear and could be ripped apart by space-time ripples on one misstep, the same thought running through the minds of the other scientists outside the container who were watching in horror of their chief physicist performing this suicide act. But Ada didn’t care at this point: all she wanted was to speak to Alice directly.

5 suspenseful seconds passed and Ada miraculously made it to Alice’s side, where she could hear her held-back moans and gasps as she experienced her growth. Ada could feel the intense warmth and raw energy that emanated from her massive bra-clad wall of tit, a powerful source that she believed was responsible for Alice’s immunity to space-time manipulation. It was also reassuring to her that she could feel this energy from her, meaning that she was within the safe zone established by her sister’s own boobs.

“Alice…”, Ada spoke softly.

“Hey, sis.’, Alice managed to croak in the midst of her pleasurable moans.

“Um, could you hold back a bit more, please? We just need a little more time…”, Ada felt as if she was pleading.

“I’m trying my best Ada, I really am. But my breasts won’t let meaaa-a-a-ahhhh…”, Alice began to trail off as another wave of sensation swept through her comparatively small body.

“Hang in there, sis! We’re trying as hard as we can t-“

“Chief!”

Ada flipped her head quickly to her rear to see a scientist at the control panel waving at her frantically. She glared at him to alert him that he had her attention.

“We’ve processed the raw real-time data of the pocket dimension status in her bra!”, the scientist shouted to get through the thick glass of the container.

“Hurry up and show it to me!”

A flip of a switch and a couple of button presses from the panel by the telling personnel triggered another monitor to blink to life in front of her and the rest of the staff, revealing the live status of the pocket dimension that was currently containing Alice’s breasts. Several eyes stared at the figures on the screen in shock of what was really occurring inside the bra.

“I-I didn’t know that the bra contained multiverses…”, one of the staff whispered in awe.

“It’s not just multiverses…it’s an infinite number of them! She’s outgrowing all of them?!”

Ada, too, was flabbergasted at the numbers. In the act of the numerous layers of dimensional bras that Alice had worn, she never realised that the dimension that her sister was filling at this moment was actually the Gigaverse, an existential plane several limits above that of a universe. And now, her monumental chest globes were about to overcome it all very shortly.

The brief moment of silence in the room as everyone was staring at the live results of the bra’s containment was brought to a close by a panicky shout from one of the white-faced scientist manning the main panel.

“Emergency! Her growth rate has spiked drastically! Readings are at 500 million googolplexes exponents!"

Ada felt her breathing halt briefly from the moment she heard his announcement. She couldn’t bear to glance over at the measurement reading adjacent to the growth rate monitor, but did so anyway which nearly caused her to faint. On the next screen, the bra containment capacity read 100 percent.

“20 billion googolplexes...3 trillion googolplexes...6000 googolduplexes...fuck…”

Right before Ada’s eyes, she saw the blue sparks flying off the bra’s locking mechanism growing increasingly intense and visible tears appearing on the bra itself. But upon closer inspection, she realised that those tears were not fabric tears from the bra but rather actual tears of space-time that were suspended in thin air. Alice’s breathing was becoming heavier and more laborious as she felt the welling within her grow stronger and stronger.

“Alice, hold it in!”, Ada cried out helplessly.

Alice was too overwhelmed with pleasure to reply, but acknowledged by grunting and clenching her fists as she did her best.

Just a split second later, there was a distinguishable, unforgettable, loud snap.

“Ah~”, Alice squeaked sensually.

And then all hell broke loose.

To the people in the room, it looked like a massive inflatable flesh-coloured wall swelled in front of them to occupy the entire lab in a blink of an eye, bursting through the ceiling and walls and shaking the ground with a powerful earthquake. In reality, the Universe encountered something that was insurmountably more immense than the Big Bang as Alice’s breasts exploded in girth to gain back to its former size, swelling from a few metres wide inside the glass container to trillions of light years and eradicating everything within it instantly. Billions to trillions of neighbouring universes followed suit in the next nanosecond as her twin pair of boobs broke the Multiverse’s barrier with laughable ease and began to fill out the Megaverse, their sizes beyond any measurement in existence to fathom.

Alice was shaking and trembling at the incredible amounts of lust held within her that was released at once like a tsunami throughout her body, moaning and gasping loudly as her breasts surged forth unrestrained. The countless multiverses within the Megaverse fell to the same fate as fast as the galaxies within her home universe, her dominating breasts popping the Megaverse’s barrier like an overfilled balloon. The inter-dimensional space of the Gigaverse shuddered violently to the arrival of Alice’s rapidly-swelling mammaries which were overtaking great swaths of its realm at unfathomable speed, filling and annihilating megaverses like insignificant dust specks. The inconceivable levels of destruction that she was causing sent more tingling sensations from the infinite existential bodies that came in contact with her chest, further fuelling the relentless growth that she was experiencing.

As much as she was against wiping out everything that ever existed beyond her own home, the euphoric relief of release was too much for Alice to withheld as evident by her buckling knees and the clawing of her hands on her endless wall of breastflesh. And consequently, Alice had also unknowingly released the untold quantities of suppressed growth that she had been holding back for all these months. Even though the machines in the lab briefly estimated that her breasts would grow to the size of the Gigaverse just before their demise, Alice would go ahead and super-abound those approximations by breaking the Gigaverse’s barrier like she did the Megaverse, her infinite breasts swelling out to overwhelm the Hyperverse in no time flat and bulldozing through millions of gigaverses in a few nanoseconds. And all this while her growth never receded, her breasts’ appetite for size insatiable as it continued to outdo its previous speed of growth over and over again at an inexorable rate such that no figure of exponents could quantify.

Back at the source of it all, a partially-destroyed Earth was nestled comfortably against the soft expanses of endless breastflesh. In spite of the cosmic havoc that Alice was wrecking, Ada was still alive and well along with the rest of the people in the crumbling lab chamber, although pretty much all of them had ran away in cowering fear of the explosion of breasts that happened faster than light. Ada remained still at her sister’s side, watching her expanding chest go as they were finally set free from their brasserie prison. The warm sensation that she felt earlier was much stronger now like she was standing by a heater wrapped in a blanket, and Alice herself was breaking in cold sweat from the continuous lustful attacks that her body was subjected to from her growth.

So much for the precautionary dimensional space…, Ada thought quietly as she glanced around at the remains of the ‘Miniature Universe’. It did bring relief to her heart that Alice was completely unharmed during the whole process of her bra bursting, although Ada honestly was feeling extremely lost to what she was to do next. Her sister’s endlessly growing boobs had finally been free and would not stop growing until they've attained their who-knows-how-big actual size, meaning that she had failed her assigned task. It didn’t help either that her own failure had also led to the annihilation of Earth and everything that existed, leaving nothing for the Human race, the future generations or anything to discover.

“Ada…”

Ada's head jerked up from her wallowing state to look at her sister’s glowing face.

“You did bring that, didn’t you?”, Alice asked softly.

“What are you referring to?”, Ada gave a puzzled expression.

“Come on, you know! That thing? That the man told us to bring in times like this?”

Ada knew what she was referring to, and cursed at herself for that.

“What? Would you think that a respectable scientist like me would bring around something like that?”, Ada scoffed.

“Would you think that I wouldn’t know that you’re lying?”, Alice cornered her with a smile.

“...”

“So?”

“...I won’t use it. Its function is beyond the explanation of science, so how can I use it?"

“It doesn’t matter if it works, no?”

“Well…”

“Come on. You know it’s your only solution.”

“Ugh, fine.”, Ada sighed and conceded.

Swallowing her pride as a physicist, she dug her hand into her left lab coat pocket and fished out a ornate artifact: a golden hourglass on a fixed rotating axle with mysterious engravings of runes.

“I just have to turn it until the desired timeframe, right?”

“Yep.That’s what the seller said!”, Alice expression lightened to her sister’s concession.

“I still don’t understand this thing, but here goes…”, Ada prepared to rotate the hourglass.

“Wait!”, Alice outstretched her hand.

“What?”

“Um, could you let me finish my growth first before you do that?”. Alice asked sheepishly.

“Uh…”

“Pleeeease? It feels so good to let my girls go. Would you at least me let my sweater puppies have a little breather without that really uncomfortable bra?”

“Hmmm…”, Ada squinted her eyes slightly in consideration while Alice gazed at her with glimmering eyes of hope.

“...Fine.”

“Yay! Thanks, sis!”, Alice spread her arms and pulled Ada towards her wall of breasts into a tight embrace, glomping her entire body in her soft, plush body warmth.

“Just don’t take too long, alright?”, Adas voice was muffled by Alice’s tits enveloping her entire body and face.

“Don’t worry. My boobs have been REALLY pent up, so it shouldn’t take them too long to reach their original size…”

With that particular matter resolved, Alice leaned back onto her chest pillows and allowed the amazing feelings of her growth take over her body again. She moaned happily as her breasts broke free from the confines of the Omniverse like paper, surging out into the Reality plane with unstoppable fervour of swelling bigger and bigger, and Alice knew that she's bound to break Reality's limit as well judging by the immeasurable amounts of energy and power still mounting within her boobs and urging for release.

"Hey, Alice?", Ada broke Alice's lustful stupor with a question.

"Mmm?"

"Why did your breasts suddenly start growing so fast? I know your growth is incredible, but I still don't understand how they've attained this new pace…", she gestured to her great expanses of titflesh.

When Ada finished her sentence, she noticed Alice's cheeks blushing. She looked towards her sister with a sheepish smile.

"Ah, I kinda snuck a taste of your ice-cream in the fridge…", Alice laughed awkwardly.