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(Warning: This story contains hyperscat, belly expansion, burps, farting, and just all that kind of gross stuff. If you don't like that, you probably won't enjoy this very much.)

God, she had put it off too long.

A low rumble escaped her midsection, and she leaned with one arm against the wall while the other gripped her belly. While all was still on the outside for the moment, just this light touch let her feel the mounting chaos boiling within. How long had it been now, exactly? She tried to remember as she rubbed at her aching stomach, biting her lower lip. A few months? Maybe more? Far longer than she was supposed to wait, to be sure; every two weeks was supposed to be the maximum!

Another rumble, this one more insistent, causing a moan to slip through her lips. She rubbed her stomach even more firmly, flexing her abdominal muscles and straining for any form of relief. If she could just break through the..

“Orrp”

She sighed as a small burp escaped her lips. It was a scrawny thing, one that she was glad to get out, but that hardly made a difference in her overloaded recesses. “Come on..” She groaned, her disappointment at such a tiny release rapidly overpowering her relief. And to make matters worse, no matter how hard she struggled, that seemed to be the extent of what her body was willing to grant her. Nothing else was forthcoming.

“No.. God, don’t make me go in there.. Not after all this time..” She groaned, gripping her stomach tighter as it started to bloat outwards in her hands, causing her to grit her teeth. “Just.. Come out!”

---

“Girls don’t fart” as an idea tended to die out by middle school age for most people, only continuing ironically beyond that, if at all. But it wasn’t until her last semester of high school the 18 year-old Cassandra learned the truth behind the statement.

Of course, it wasn’t the case for all girls. The secret needed to be well-kept, obviously. If you knew the right people, however, were part of the right clique, you could get an in.

Her friends introduced her, a secret setup in some women’s restrooms--”You gotta remember which ones, though!”--that held the key to never having to worry about embarrassing slips ever again.

“It helps keep your figure, too!” Nicki, Cassandra’s recently-acquired best-friend-forever enthused quietly during a sleepover. She was convinced the girl was bluffing, but let her carry on. “You can eat whatever you want, the compression takes care of all the excess and holds onto it for you!”

Cassandra paused for a moment, trying to gauge whether this was some elaborate prank to test how gullible she was.. Still, thinking back, she’d never seen Nicki belch even once, not even after drinking soda. And she certainly seemed genuine, so maybe..

“So you just.. Release all your gas and shit at once? That doesn’t sound fun..” She said, uncertain.

Nicki shook her head, smiling. “Nah.. It’s not too bad. Well, not for me anyways. Some girls don’t enjoy the process as much, but it’s totally worth it! And some people really get into it, they say the sudden buildup and relief is the best thing they’ve ever felt.” She crossed her arms, nodding assuredly before winking and putting a hand on Cassandra’s shoulder.

“And of course, you’ll never know until you try.”

---

And so she went through with the compression. For the first week, she found herself increasingly enamored with the newfound freedom it granted. She ate just about anything she wanted, and a lot of it, too. Cakes, sugary sodas, greasy chilli dogs, the works. All the things she’d abstained from for years, now finally she could enjoy without any stress or worry. And god, no burping, either! She drank bottles and bottles of soda, and not a once did she have to worry about stifling a belch depending on who was around, she didn’t even feel an urge! There was no holding her farts in class, no worries about having to make her bathroom breaks quicker so nobody would know she was pooping.. She could really get used to this.

Of course, that was until the decompression.

Nicki was waiting for her as Cassandra descended into the hidden room. “Right, you ready? I can step out if you want while it happens, but I figured since it’s your first time I should show you how to get started.”

Cassandra blushed, embarrassed as someone knowing what she was about to, well, do. “Th-thanks.. But yeah, I’d like to be alone when, um, it happens, I think.”

Nicki nodded, understanding. “Of course, yeah.” She led Cassandra over to the control panel. “So all you do for a decompression is..” She started going over the knobs, switches, and dials to set. “Since you’ve already gone through the first compression, it’ll recompress you automatically after each session. Plus, it’ll clean itself after you leave! Nice and easy!” She beamed, shooting Cassandra a winning smile. “Welp, good luck, Cassie! See you at lunch!” And with that, the girl stepped out.

Waving goodbye, Cassandra took a deep breath, letting it out slowly to steady herself. Well, no sense waiting. She followed Nicki’s instructions, a noise of machinery humming tickling at her ears, and then stepped over to the vault. A room all to itself in a way, it was like a large box, with a sealed metal door and what looked like frosted glass looking into the enclosed area. Dropping her clothes to the floor, Cassandra unsealed the door, stepped inside, and closed it behind her. She gulped, not knowing exactly what to expect.

“Decompression activated.”

A robotic voice signalled the start, and as Cassandra looked up instinctively, she was caught off-guard by the loud “Oooaaaarrrpp” that escaped her lips.

She blinked, clapping a hand to her mouth. A bubbling feeling was building in her stomach, things were shifting around for the first time in a week. Pressure built up, and in spite of instinctively trying to hold back she couldn’t stop a triple-barrage of belches from bursting out of her mouth, each going on longer than the last.

“Oohhh, nnnn…” She moaned, leaning over forward as the pressure doubled and shifted, a rude blast escaping her backside. And then another, and another.

“W-wait.. StoOAAARP.” She tried to protest, pressure mounting to untenable amounts of discomfort within her belly. Each release had so much power behind it and, god, it actually kind of hurt. Every expulsion sounded louder, shook her frame more as her body jerked about, instinctively flexing to try and rid itself of everything. “Oh-” Another bubbly burp interrupted her. “-godd!” She cried out, falling to her knees and groaning as a massive, ten-second fart transitioned to a massive spray of diarrhea which launched with such force it sprayed up against the far wall. She yelled in shock, biting her lip and straining as more bubbled and sprayed out. It varied from moment to moment, some pushes and bodily contractions forcing out watery sprays which spattered haphazardly behind her. Others produced more solid masses, stretching her hole before being flung out by her straining and the incredible pressure behind them. Gas forced itself from her endlessly, her eyes watering as her asshole strained with everything battling for freedom from her colon, and from the increasingly frantic belches that were burning her throat.

She let out a noise which was half massive burp, half yell as a rope of shit thick as her wrist burst from her ass, piling up behind her. God, she couldn’t take it, it was too mu-

Just as suddenly as it had all began, the burp ended, and the massive quantity of dung tapered off and splatted to the ground, narrowly missing her foot. She remained tensed up, expecting more, when a faint whirring sound echoed through the room, followed by a return of the robotic voice from earlier.

“Decompression complete.”

She stayed tensed for a moment longer before finally relaxing, sighing in relief. That had been a lot more intense than Nicki had implied; she had half a mind not to ever do it again… But she did feel pretty good afterwards, and being able to eat anything she wanted…

Well, it certainly couldn’t hurt to give it a few more weeks to try it out, right?

---

A few weeks turned to months, then years. Cassandra found that the process never quite got any better, but the allure of the positives pushed her on with the habit well into college. It wasn’t until her junior year after a week of drinking and binge-eating led to one of the worst decompression sessions she’d ever had--beer shits and burps coupled with incredible amounts of bulk turned out to be a bad combo in the chamber--that she decided she’d had enough. Surely, she could just stop, right? She’d lost contact with Nicki and the rest of her friend group after high school, so she didn’t have anyone she could ask.. But eventually her body had to sort itself out, it just had to. It’d probably suck, but hey, then she could go back to how things were before and never have to step into one of those awful chambers ever again. Steeling herself, she made up her mind.

And so weeks passed, and then months.

Despite occasionally stealing off to the bathroom in the middle of the night to try and strain out any waste, nothing seemed to want to come out. Hell, she didn’t even feel an urge. After a while, Cassandra unwittingly stopped remembering to try. There was no discomfort, nothing seemed wrong by all perception. The only clue that something might be amiss was the occasional bubbling noise from deep within her middle, but it always faded quickly and never hurt, so she shrugged it off.

Eventually, as concern faded, pride began to take its place; it felt almost like a superpower of hers at this point. Her body was taking everything like a champ with no issues! Even without decompressing herself, she quickly reverted to the eating habits she’d had while while she’d been doing so.. And then rapidly increased them tenfold. It was a source of confidence on its own, being able to put away larger and larger amounts of food without any negative backlash, which turned her into a bit of a marvel in her social group. There was something undeniably fun about a small girl who could put away enough food for three people, after all.

And so life continued in relative normalcy like that, until she hardly remembered it wasn’t normal at all. But in the end, what goes in, must come out.

Cassandra been walking to class when it happened, feeling up until then as normal as ever. Suddenly, she took note of the familiar bubbling sensation within the pit of her belly, but this time it didn’t seem quick to stop. Pausing in her tracks to look down and place a hand on her stomach, she tried to reassure herself that it was nothing and carry on with her day. As she took a seat in class the bubbling pressed on insistently, but still wasn’t audible, so she tried to just focus on taking notes, her pride in her body’s newfound abilities leading her to doubt anything could be wrong at all. She’d wedged however much she wanted of whatever she wanted into her stomach without concern for so long, it seemed positively alien to think it could have a limit now.

GroaaaAAnnnnn…

She went pink, wrapping an arm around her stomach and glancing around to make sure nobody had noticed the upset noise that her guts had just produced. Thankfully, nobody had, but it was still alarming. That was new, it hadn’t made a single peep for as long as she could remember. Just as she was starting to let her guard back down, the bubbling came back with avengeance, this time audibly so. Cassandra didn’t want to even try and take the time to determine if it was loud enough for others to hear or not, she quickly packed up her things and ducked out of the lecture, biting her lip as she went.

---

“Ohhh.. What’s going on? What’s the matter?” She asked her stomach, as if it could respond. It did, in a way, with a strained gurgle and light cramping emanating from some deep, unfathomable place within her.

“Oh god.. Oh god is it time? Oh..” She wrapped her arms around her center, ducking off to the nearest restroom and hurriedly planting herself inside a stall. Yanking down her pants, she quickly got to straining.

“Come on.. Please..” She moaned, the bubbling getting louder. “Just a little to… Ngghhhh… Relieve the pressure..” Despite her abdominal discomfort, nothing wanted to move, it seemed. “What am I gonna do..?” She whined, holding her head in her hands. She needed to do something, her stomach was clearly upset and she needed to break the seal keeping her blocked up somehow. She ran through possible solutions in her head, before coming to rest on what had to be the worst idea she’d ever come up with. But damn, she was desperate. With an ugly squelching noise and a sharp cramp, she pulled up her pants and hurried out the bathroom door.

---

Cassandra opened the door to her dorm, juggling three plastic bags looped in her hands and held between her arms. God, this was an awful idea.

She sat down on the ground and reached into one of the bags, producing a two-liter of cola. Hesitating for only a moment, she removed the cap and started to chug. If she could just focus a quick buildup of gas in one area before her body could adjust, maybe it’d force the seal to break? Fuck, she wasn’t a science major, but it sounded okay. She chugged the first one like a champ, then the second. She started to slow down around the third, and by the fourth she was really starting to regret this idea.

BlugrihgubrrROaanGbublrrrrrrrr

The bubbling in her middle had only gotten more intense, the cramps more frequent. This had to work. She forced herself to believe the increased activity was a good sign and pressed on, chugging the last three bottles before collapsing onto her back, holding her stomach in both hands and whining in misery and regret. The pressure was nigh unbearable.

“Pleeaaase.. Oh god, please, come out..” She tried to change position, holding her knees to her chest, standing up and walking around, nothing seemed to work, and the pained noises from her center were becoming disturbingly loud.

A low rumble escaped her midsection, and she leaned with one arm against the wall while the other gripped her belly. While all was still on the outside for the moment, just this light touch let her feel the mounting chaos boiling within. How could she put it off for this long? Why did she let it get this bad?

Another rumble, this one more insistent, caused a moan to slip through her lips. She rubbed her stomach even more firmly, flexing her abdominal muscles and straining for any form of relief. If she could just break through the..

“Orrp”

She sighed as a small burp escaped her lips. It was a scrawny thing, one that she was glad to get out, but that hardly made a difference in her overloaded recesses. “Come on..” She groaned, her disappointment at such a tiny release rapidly overpowering her relief. And to make matters worse, no matter how hard she struggled, that seemed to be the extent of what her body was willing to grant her. Nothing else was forthcoming.

“No.. God, don’t make me go in there.. Not after all this time..” She groaned, gripping her stomach tighter as it started to bloat outwards in her hands, causing her to grit her teeth. “Just.. Come out!”

She cried out in both fear and pain as her stomach continued to bloat out. She couldn’t wait any longer, there wasn’t another option. Her stomach groaned discontentedly, and as she stumbled for the door it lurched, forcing out another tiny belch and kickstarting a storm of hiccups. She could feel her insides roiling and bloating under her hand as she held her belly, making her way for the nearest restroom she knew contained what would be her only salvation.

---

“Nnhh..”

Cassandra moaned aloud, kicking off her pants and struggling with her top and bra with one hand while the other cradled her trembling, overloaded tummy. Too long, way too long. All the binges, all the greasy, heavy foods she’d indulged in over the previous months haunted her mind as the gurgles from her gut echoed around the empty room. She fumbled with the switches and dials, the proper instructions still etched into her mind after all this time. Her eyes watered as she gripped the wheel to unseal the door like it was a lifeline, terrified of what she was about to endure, and the vengeance her body was about to wreak upon her.

She stumbled inside, whimpering and clutching her distended middle, before bracing herself with both hands against the frosted glass.

“Decompression activated.”

The bubbling became deafening in almost an instant, sending pangs of warning and fear shooting up Cassandra’s spine. She had no time to prepare as a lips-flapping belch exploded out from her mouth and extended on for seven seconds. She clenched her hands to fists, leaning further into the glass and tilting her head up in a desperate attempt to grant her body easier release as her stomach flexed, each visible contraction forced out more and more gas, each burp going on longer than the last.

“Ohh..” A loud loud BRAPT burst out from between her asscheeks. It was really getting started now as loud, brassy farts exploded out from deep within her, ass lurching out with each expulsion as she gripped the sides of the chamber, yelling out between belches as the pain of both her emissions and the chaos inside her belly worsened. All the while, the gurgling, heaving, roiling, bubbling, and roaring of her stomach only intensified, and with it so did it increase further and further in mass.

“Oh god, nOOAAARRRPPP- not enoOAUURR-ugh is coming ouUUUUUUUUUUURRRRRP.” She cried inbetween belches, breaking out in a sweat and crying in pain as her stomach gave a sickly lurch downward, forcing her lower to the ground as her gut grew out another few inches.

She grit her teeth, straining and letting loose the largest fart of her life. It gaped her asshole, caused her eyes to water, seemed to shake the confines of her sealed prison, and it went on and on for seemingly ever, until..

“NGH!” She cried as something solid lodged itself firmly in her asshole, stopping all further progress. She let out another extended “Oouuuurrrp” and a storm of smaller, sharp burps as she strained to keep things moving. Already she could tell it was huge, but how wide exactly was a mystery. Five inches at least? It was impossible to tell what its maximum girth could even be at this stage, as it merely domed her asshole out as she strained, her sore rim refusing to let the monster pass.

“Oh no, no, no, no!” She cried, stomach letting out louder and louder complaints as its secondary vantage point for release was blocked off. It swelled further, bulges forming and rolling across her stomach as her insides thrashed about. She tried to burp as much as she could, one hand squeezing her stomach in an attempt to force as much out as possible, but it just wasn’t enough to counteract the vast quantity of waste and gas blowing her up from the inside.

The pressure continued to build, her asshole straining to stretch enough to let the plug loose. Slowly, slowly, it started to move, the pressure from within her wailing recesses pushing against it like water pushing against a clog in a pipe. But if that clog refused to move quickly enough..

“Oh god.. My stomach, it’s gonna-!”

Her stomach let out a horrible, deafening roar, and with a scream of pain and effort the massive, eight-inch plug of scat finally passed through, launching across the room and slamming into the opposite wall, followed by a storm of massive turds averaging the length and width of one of her legs.

She screamed, falling to her knees as her ass positively exploded. She belched consecutively, some going on for so long and coming in such frequency that she struggled to breath. Tears ran down her face, her belly spilling out on the floor. It could have been a living being all its own, moaning and shifting about like it was.

The storm from Cassandra’s ass continued like she was a mortar cannon, loud blasts of gas following each one as her colon fought to release whatever it could. Each massive piece of crap slammed the opposite wall, launched with as much power as they were, and began to form a pile which rapidly overtook the woman herself in size.

The texture of her shit began to shift, first, her belly let out sickly wet, gurgling noises and wet, sloppy, bubbling farts signaled the forthcoming of chunky, explosive diarrhea. It blasted out from her gassily, spraying everywhere and burning her asshole. She cried out between belches, cursing herself for all of her greasy food binges. “Fifty chilli dogs in OORRRPP one URP sitting.. Oh gOOOORRRRRR.” She moaned, her mess continuing to sputter and splatter out behind her and add to the mess fouling the room.

Then, it shifted again. Now it was pure liquid, gushing out from her uninterrupted save for the intermittent loud blasts of air emerging from deep within her bowels. She felt like a fire hydrant, or like someone trying to funnel a waterfall through a drinking straw. She grunted hard, straining for as long as possible at a time to keep the blasts coming. She couldn’t let up, not for a second.

Now her stomach made a noise more like a loud, agonized groaning. It visibly heaved, bulging out on one side before its entire mass took to bloating out considerably. It was like a large bean bag chair at this point, and the noises coming from within were positively monstrous. She belched long and hard, bracing herself as storm of mostly-solid shit burst out in one consecutive stream.

It went on, and on. Most of it was solid, but long spurts of liquid would occasionally escape alongside one of the oversized logs, or maybe they’d sputter out on their own, squirting painfully into the air as her ass lurched, helpless against the internal pressure. Other times, it’d come out in long, painful sharts, which grew so powerful Cassandra was now certain the area surrounding her was shaking.. Or perhaps that was just the force of her stomach’s movements vibrating everything, it was hard to tell.

She was making progress, expelling such incomprehensible quantities of waste that she was, and yet it still didn’t seem to be enough. She cried out, leaning into her stomach, the writhing testament to her mistakes, and sticking her ass up in the air as a trio of violent farts bursted out from her. It wasn’t enough, something had to give.

She wailed, her stomach shaking beneath her like there was an earthquake occuring within. It lurched, once, twice, the pressure mounting, the bloating increasing…

Cassandra let out a scream as, with a roar which shook not only her entire middle, but echoed out so loudly it could be heard well beyond the lonely chamber she was sealed in, her stomach squeezed in on itself and her ass exploded.

She screamed in agony, gripping her slowly deflating stomach as the force and width of her crap doubled. The room was rapidly filling, but she could hardly notice as she cried out, slamming her hand against the frosted glass. Her ass florped out rope after rope of slippery, oversized waste. The pressure was so great that regardless of whether she pushed or not, the birthing of months worth of shit hardly slowed.

“OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOORRRRRUUUUUUUUUURRRRRRRRRRRRR-”

A massive belch let loose from deep within the pit of her stomach, continuing on and on alongside the bursts of scat being forced from her ass, both increasing and lowering in intensity with each contraction-like squeezing of her quaking belly. Tears streamed down Cassandra’s face, it didn’t feel like it was going to end, like she’d be stuck shitting out the product of her gluttony and pride for the rest of her life.

Eventually, though, as slow as it was, her stomach did deflate. With one last loud blast of gas misting the last of her shit for good measure, Cassandra was finally, after all that time, empty.

She collapsed, propping herself up against the glass. To her horror and shock, her mess nearly filled the room; had there been any more, she likely would’ve been swimming in it. It reached to the ceiling entirely, and, to her chagrin, blocked the door. That was gonna be a pain to deal with.

But god, she felt so much better. Sighing, she let out one last satisfied burp, never having felt so blissfully empty in her entire life before.

“Decompression complete.”

She didn’t move from her spot, taking a moment to catch her breath before she’d have to dig her way out of the room. Her ass burned and her stomach had a residual ache to it, but now accompanied with feeling light as a feather there was just something so uniquely satisfying about it all. She wanted to live in that exact moment forever.

She thought to herself, as she looked over the mess she’d created, if she felt this much better after expelling a few month’s worth of waste, how would would it feel to hold on for a year?