Universal Expansion (Patreon)

Brandi and Kama stared at the elusive breastpansion gummies; gummies said to make your boobs grow as big as whoever eats them desires. Brandi was a blonde with blue eyes, and Kama was a brunette with brown eyes. Brandi was an extreme extrovert, always seen walking out of her house meeting up with one of nearly a hundred friends, while Kama was an introvert, never leaving her house unless she absolutely had to. They saw themselves as fundamentally different individuals, and thought they would never interact in any meaningful way in their lives.

So the two were surprised to see each other in the store after the announcement of the new breastpansion gummies. These gummies were made to efficiently store fat and influence the body to distribute it wherever it desired. In this specific case it was the breasts, allowing for the user to gain quickly growing and completely natural breasts. Despite some criticism these were immediately quite popular, supply overtaking demand as they have become increasingly hard to find.

Brandi and Kama looked at each other's chests, realizing that both of them had the same breast size, and that was none. It was as if the two had never gone through puberty, having chests flatter than many of the boys they've met. This has disheartened and embarrassed them quite a bit, so they've been searching for these for a while. They've finally found a pack in the store, the final one available, only to then crash into each other trying to get it.

"Um... hi."

"Hello there..."

The two waved at each other awkwardly, not really knowing what one was supposed to say in this situation.

"Your name... it was Kam..."

"Kama, it's Kama."

"Oh, sorry. So it's pronounced Kama."

"Yeah, that is correct. Um... and I guess yours was... um..."

"My name's Brandi."

"Oh. Um, thanks Brandi."

The two were awkwardly shuffling about and glancing at each other, not sure on how to carry the conversation or what to say next. Their arms shifted towards the pack of gummies, both of them trying to grab it at the same time. They felt each other's hands grab the box at the same time, blushing a bit from embarrassment.

"So... I guess you need these as well..." Kama tried to continue the conversation as well as she could.

"Unfortunately yeah..." Brandi was a bit annoyed at the implication of this comment. "Although I feel you probably need this more than me."

"What!? No no no no no!" Social situations like this tended to overwhelm Kama, and she didn't like to be reminded of her lack of assets. "Go ahead and take it, I don't need this as much as you."

This made Brandi really annoyed. "I don't mind, take it! I bet my boobs would end up too big if I have these anyways!"

Kama started to sweat a bit from the nervousness. "Actually I heard that the expansion effect is multiplicative. So I might end up with absolutely massive breasts compared to you."

"Are you trying to imply you're bigger than me?"

"I'm just trying to imply that you need this more than me."

"Don't make me laugh." Brandi scoffed, trying to hide the rage she felt inside with a veil of overconfidence. "A single gummy would probably fail to make them grow an inch!"

"That's not true!" Kama found her eyes watering from the insult, not used to being insulted like this. "If anything, they would at least be bigger than yours!"

"You must be kidding!"

"Want to prove it then coward!? We'll both eat a gummy and compare, and I bet you I'll be bigger!"

"Fine! Don't complain when I end up winning though!"

The two pooled their money and bought the gummies together. They agreed to meet the next day, going to an empty public park to start their little competition. Each of them took a single gummy from the pack, quickly swallowing in order to try and prove each other wrong.

In an instant they could feel their shirts starting to become tight. Kama unbuttoned her button-down shirt, while Brandi took off her T-shirt, the both of them revealing their newly formed breasts. Before they could barely be considered A cup, but now they looked like Double Ds.

"See?" Brandi posed, exposing her bare chest for all to see. "My chest grew bigger than yours!"

"It doesn't look like that to me!" Kama, a bit awkwardly, uncovered her chest and showed off her new set of boobs. "Mine still look bigger."

"Maybe we didn't take enough. If we take more the difference would be obvious."

"Just one more though, I'm sure you've seen the warning labels."

There were warning on every pack of these gummies warning users not to eat more than three within an hour of each other. It was warned that consuming too many before one had the chance to settle could cause disastrous issues.

So the two only took one extra gummy each, and immediately their chests immediately started to swell. The Double Ds that they just had grew much bigger, now bigger than their heads. The two didn't have any idea how big this was considered, only that it was a much bigger growth than before.

"See, I'm bigger!" The two faced each other, groaning as they saw each other's new chests.

"Let's compare them closer," Brandi said, pressing her chest into Kama's.

"Y-Yes." Kama jumped a bit from the nipple contact, but steeled her nerves and pressed her chest into Kama's. Brandi didn't expect Kama to actually fight back, pressing harder as a result.

The two pushed their breasts into each other as hard as they could. They tried to cover up each other's breasts as much as possible, to make the other appear smaller while their breasts looked bigger, but they still seemed completely equal.

"I'm bigger!" The two groaned, starting to get tired of this.

"One more," Brandi said.

"This is the last one," Kama replied.

And so the both of them took their third gummies from the package. Once more the breasts swelled, reaching a size that was simply inhuman. The breasts started to reach their stomachs in size, going past them and touching their legs, becoming so heavy that the two couldn't stand up anymore. They were forced to lay them on the ground, and they felt like this big might be a bit inconvenient. But at least they had the bigger pair, right?

The two dragged their breasts across the ground and pushed them into each other. They pressed as hard as they could, looking as close as they could, yet the breasts looked like complete mirror images of each other.

"If you look closely," Brandi said. "It looks like I'm an inch bigger."

"No way," Kama said. "I'm at least two inches bigger than you."

"No way! Isn't it obvious that I'm dominating here!?"

"Not to me! From here it looks like I'm clearly bigger!"

Brandi didn't really care about who had the bigger breasts, it was likely she never did in the first place. Her previously small chest was a source of pain for her, making this fight feel personal. But it all seemed hopeless, until she saw the gummies in the distance.

She reached for the pack of gummies between them, the result pushing her chest further into Kama's. Kama gasped from the suddenness of it all, instantly realizing what Brandi was trying to do. Not willing to let Brandi get to them, Kama reached out for the gummies herself.

"You can't take another," Kama warned Brandi. "Didn't you see the warning!?"

"It probably isn't serious," Brandi scoffed. "I bet you just want to take them for yourself and become bigger than me!"

"That's not true at all!" Kama reached further and further, pushing their breasts together harder and harder.

"Then why are you reaching for them too!?" Brandi reached further and further, pushing their breasts together harder and harder.

With how large their breasts were at this point it was impossible for the two to reach the gummies between them. They pushed and pushed and pushed, their nipples feeling like they'd burn right off from the friction. Recognizing the situation they began to slowly turn their bodies towards the gummies. Their position slowly but surely changed, with the two eventually being shoulder by shoulder with a box of gummies still between them. Their breasts were still wide enough that even at this position the sides pressed into each other.

The two grabbed onto opposite ends of the box, pulling on it relentlessly. The box burst open, and the two rushed to grab any they can and drop them in their mouths. Not willing to let her opponent swallow any, Kama took the initiative and kissed Brandi. Brandi was shocked, but tried to use it to her advantage, the two of them wrestling within their mouths in an attempt to get the gummies. With one slight squeeze a bit of the juices flew into both of their mouths, triggering the next bit of growth.

Even a tenth over three is still more than three, and like the warning said the results were disastrous. The breasts rapidly expanded, quickly filling up the rest of the park in their size. Benches and trees were crushed beneath their flesh, completely overpowered by the sudden growth of flesh.

More and more gummy juices were sucked into the mouths of Brandi and Kama, the two now roughly back to back as they both attempted to grow their breasts as much as they could. The breasts started to become as large as whales, every shake they made knocking over buildings and skyscrapers.

But new matter can't be created out of nothing. The breasts still aim to expand despite not having the mass for it. So the surrounding get absorbed into the flesh and transformed into part of the breast. The land itself was getting transformed into part of their breasts, buildings and people as well. The more and more they swallowed, the more their breasts did as well, becoming bigger than the country itself.

Their breasts absorbed everything around as they expanded, even the people around them. Some of the people they absorbed ate their own breastpansion gummies, getting absorbed into their systems and having the same effect on them. The expansion accelerated instantly, with their breasts covering the entire planet in no time. The Earth was crushed under their weight, with no one left to here them scream.

But whether they screamed or not they still had one goal, and they fought for it as much as they could. Their breasts expanded more and more, stretching out into the rest of the solar system. Mars was swallowed up, Jupiter and Saturn were as well, and even the Sun was eventually caught within the mass. They stretched further and further, light years in diameter. Multiple stars were swallowed up, black holes couldn't compare to their growth, and soon the entire galaxy was simply part of their breasts.

They didn't stop there. Another galaxy was swallowed up in their mass, and another and another. Clusters of galaxies ended up as simply part of their ever expanding tits. Alien planets didn't even have time to react, as it wasn't long before the entire universe was getting swallowed up in their flesh.

But they weren't content. They had to beat each other, no matter how much it took. They pushed and pushed and pushed, until the walls of the multiverse itself started to break down. The breasts stretched out into infinite universes, absorbing infinite alternate versions of themselves and growing infinitely in size. Multiple universes and timelines found themselves becoming part of these girls' breasts, expanding out as far as they could until all of time, all of existence itself, was simply their breasts.

But there still wasn't a victor. The two didn't care anymore, trying to make their breasts grow as much as possible, but this was the limit. The two were still equal, but their breasts couldn't grow anymore. They hit the edge of the omniverse itself, it was impossible to grow any larger.

But they still pushed. They pushed and pushed and pushed and pushed, hoping that they could grow by even one more inch. As if the universe agreed to their will they could feel a crack. The walls that contained all of everything itself started to crack, breaking and crumbling under the might of their wills. They pushed and pushed and pushed until...

,

"I'M BIGGER," they both yelled.