Busting out of Jail

by Borealium

Rating: mature
Tags: Sex, My Little Pony: Friendship is Magic, Anthro, Porn, Fetish, Gilda
Length: 4994

A prison designed to contain hyper-sized criminals finds a test subject in the form of a griffon with near-limitless growth powers.

In a world where some criminals are too large or powerful to be contained in a normal prison, Equestria's top minds are working hard on technology to keep them contained.

Gilda the griffon is perhaps the most large and powerful individual in the land, her godlike feats of growth and strength unparalleled. There's no one better to give the new prison a thorough test.

Includes: impossible powers, very curvy hyper futa Gilda, growth (including growth to macro size), super strength, hyper density, ass/cock/balls/breast expansion, multicock/balls, and cloning.

Cover art by jupiter_jyohti used without permission, will remove upon request.

Published 2017-12-29 20:20:07 UTC
Last updated 2017-12-29 20:20:07 UTC

This jail ain't big enough for the one of me

After a long journey through the tranquil, remote desert, Gilda was finally approaching her destination.

Rising in the distance was a large and foreboding complex - a new prison, far more secure than anything that had ever been designed or built before. A prison designed to contain the toughest occupants; hypers and growers. Before lining up the offenders and shipping them out here, though, the jail needed testing. Thoroughly.

And that’s where the big, curvaceous tawny griffon came in. She was a hyper, and a grower. She was very strong and could grow very, very big. So the prison management got in touch, and here she was.

It was nice to be out on a sunny day like today, even if it was in open, baking desert. The air con in the bus (which she had to herself) was pleasant enough against her feathers, and her shafts drooped lazily over each meaty thigh. She was looking forward to today, looking forward to putting her body to the test. It was satisfying knowing that at a whim, without the slightest bit of effort, she could make each cock grow bigger than the bus she was riding in, in the blink of an eye. They fattened up a little at that thought.

The bus began to slow as it approached a tall perimeter wall that stretched away from the road in both directions, topped with masses of thick, highly electrified razor wire.

Pff, Gilda thought. Could stroll through that.

And that was the problem faced by the builders of this prison - some criminals were just too big or too strong to contain in, well… anything. They had to keep, trying, though, and this time a test occupant would be a big asset in more ways than one.

Gilda was quite excited. She knew at the back of her mind that the chances of her being contained by this prison were so incredibly small that the guys here were wasting their time, but it would be fun to test out her abilities in a new environment - and fun to break a few things without consequences for once.

She squeezed her eight-foot, curvaceous body through a steel door into a processing area. The staff behind the desk eyed her with a mixture of desire and interest. Soon, if the trials went to plan, there'd be a lot of hypers coming through these doors, but for many of the staff this was their first up-close-and-personal experience with one. And what a specimen!

"Gilda, I assume? Straight along the corridor, left, then first door on the right."

She gave a smiled and nodded, her incredibly wide hips pushing quite firmly against the wall on one side of her and the metal mesh on the other.

"This could do with a widening, I'd say!" she called to the desk on the far side of the mesh. Not even started growing, and she already felt like she was rather too big for her surroundings. The attendant behind the computer monitor raised an eyebrow, nodded, and began to murmur to the woman beside him.

Gilda ducked, and squished herself through the second reinforced doorway at the far end of the narrow processing corridor. Her hips bounced back out, and she couldn't resist giving them a little shimmy as a guard walked past her in the corridor. He blushed, forcing himself to drag his eyes away as he walked off to the next of many meetings before the jail would open and hoping she didn’t notice the pink tinge to his cheeks. Gilda knew a fan of hers when she saw one, though.

Her first assignment was to test out the standard-issue cell, which most inmates would be held in. The details of its construction were highly classified, but suffice to say the bars and walls were very, very tough - it had to be to withstand the superpony strength, and growth abilities, of many of the occupants who’d call them home. It was essentially a metal box, with things like shelves and the sink drilled directly into its sides. The only thing not made of dull, shiny metallic material was the mattress, pillow and bedsheets, and the minimal comforts allowed to the prisoner. There was a window of sorts: a small rectangle, about four inches tall and twenty inches long set up near the ceiling on the back wall.

Gilda turned left as instructed, and saw stretching before her a hallway with fifteen or so cells on each side. One had a green light above it rather than a red, and she turned the big, heavy latch, stepping inside. She shut it behind her and took the room in. She already felt a little bored just looking at it, and was glad she wasn’t going to be cooped up here for a long time. A speaker in the hallway crackled.

“Okay, Gilda, the administrative team are all ready, we can see you on the monitor.”

There was a little camera with a flashing red LED up in the corner. Gilda gave it a wave.

“First assignment brief is here in front of me. You know why you’re here, to test our prison to its limits. Starting off very straightforward today, simply try to break out. If and when you manage to make yourself an exit, see what kind of damage you’re able to do to the walls, they’re the strongest part of the cell. In your own time.”

The speaker crackled again, and Gilda took a seat on the bed, her big, wide hips covering almost half its length. She felt like a kid in a candy shop.

“Alrighty, let’s have a little fun.”

She gave her shoulders a roll, followed by her neck. Her hips began to creep out either side of her, her ass cheeks packing on pounds of weight as they sank deeper into the thin mattress. Her breasts slowly oozed their way down her chest until they were resting comfortably against mid-thigh. Her entire body subtly grew in size, creeping past nine feet. Although it was hard to tell from an outside perspective, she was rapidly increasing her density, packing hundreds, then thousands, of pounds onto her body. If she did this sort of thing often enough she could probably manage it without growing, but there’s something of a mental crossover when it comes to willing herself larger as well as heavier that she hadn’t quite managed to distinguish perfectly between in her psyche just yet. It’s not like she was going to complain about having a bigger ass, anyway.

By the time her badonk was large enough to rival a couple of yoga balls, she weighed more than everyone else currently on the grounds of the prison combined. Several times more, in fact. By the time she was tipping the scale at fifteen thousand pounds, the bed made a quiet creaking sound, but it didn’t seem particularly fazed.

“Stubborn, hm? Okay, then…”

Rather than letting her weight increase like a cap slowly being unscrewed from a lid, she put a little effort into it. The bed groaned as her hips spread out further. The tip of her lowermost cock kissed the metal floor, leaving a little dent in it. She was gaining a thousand pounds every two or three seconds now, and it was only speeding up. Finally, by the time she was approaching the weight of Ponyville town hall, putting a good 150 thousand pounds onto the bed’s structure, it started to sag slightly beneath her giant butt.

With another brief surge of effort, quickly taking her up to 220,000lb, the bed frame began to split into two halves, the metal slowly sloughing away beneath her as if it were melting. She pushed her hips down, and the frame buckled. A good five feet across, her ass forced its way through the metal, and slammed against the thick floor, making a deafening noise and leaving a pair of circular craters in its shiny surface a good four inches deep.

Satisfied, she pulled herself up with a smirk, her feet slowly sinking into the floor. She gave a thumbs up to the camera, turning round to admire her handywork.

"I did a pretty good job, dontcha think?"

The analysts on the other end of the feed note down the readings from the weight sensors in the floor. It'll hold her, for now anyway.

"Okay, Gilda, don't make yourself any heavier, we don't want you falling through the floor and getting hurt."

Pff, her get hurt? They should be more concerned about the prison.

"Now we've got a rough idea of the strength of the floor, and the, uh, bed, see what you make of the bars."

Gilda turned, and stepped over to the dozen or so metallic bars making up the front wall of the cell, the door set in the middle. She still weighed more than 200 tons, she had to remind herself. It felt amazing, though - the incredible strength of gravity pulling her downward, compensated automatically by the incredible innate strength her body was generating to keep her upright. She felt so powerful with every step, like she could just walk straight through anything put in her way. And she probably could!

"Okay, I'll give it a go."

She placed her hand around one of the bars, roughly the circumference of a domestic drain pipe. With a thought, she began to pile muscle onto her right arm. The rest of her body stayed the same, but her arm blossomed with thick muscular mass. Her tricep expanded out and downwards, her bicep grew into a glorious hemisphere nestled between her rising shoulder and rock-hard forearm. Within seconds, she could put the biggest bodybuilder on earth to shame. She began to squeeze, the metal feeling hard in her grip, but not unmoving.

With more and more pressure, it began to crumple at a molecular level. She willed more strength into her arm, encouraging it to greater and greater sizes, until it was simply enormous, like the arm of a twenty foot tall bodybuilder Gilda shoehorned onto her eleven foot self. She began to rotate her wrist, and the bar squealed in protest, bending into a curve as her immense strength subjected it to her will. With a jerk back, she tore the bar in two, the lower half turning towards her like a broken candy lace. She breathed out, letting her arm shrink back down to a gentle, toned form. The bar was very much compromised, and again, the analysts studied the data.

Gilda had subjected it to enough force to turn Celestia's chariot into a little cube of metal. She hadn't used nearly all of her strength, but most inmates here wouldn't come close to that - whatever it was, she couldn't be absolutely certain herself.

"Good work, Gilda, this is very helpful information. Oh, if you wouldn't mind making yourself your normal weight again, it's starting to make a bit of a mess of the floor.”

Gilda looked down. Where she’d been standing still for the last minute or so, her feet had sunk into the floor nearly up to her ankles. She willed herself lighter once again, shrinking down to eight feet and a mere five hundred pounds.

“Alrighty! Time to give the bars a real run for their money.”

With great enthusiasm, she gripped two bars in her hands and shoved her nearly-rigid cocks between them. They immediately warped, being pushed aside as her night-black shafts quickly stiffened up from the delicious stimulation being piled upon them. A few quick hip thrusts made her feel very good indeed, her dicks fattening up almost of their own accord as the bars were pushed further and further apart. With a very firm hip thrust, she pushed herself down to the hilt; she grunted, and her cocks bucked as twin ropes of cum spurted from their heads, thwacking against the far wall and leaving two fist-sized dents in their surface. She shivered with delight - she couldn’t remember the last time her dicks had been wedged between something that offered this much resistance to her ungodly strength, and it felt fantastic. She wanted to just stand there and cum her brains out all day, but with an amount of willpower only she could manage, she slid her dicks back out and reluctantly walked back out through the metal door, dribbles of jizz spattering on the floor as she walked down the corridor to her next assignment.

She walked down the hall until she reached a small door, smaller than the last. She squeezed her big, wide frame through. Inside, she found a padded cell, and a couple of prison staff, one of which was holding what looked like a straitjacket. This is where the most non-compliant inmates would end up.

The straitjacket looked strange. It was shiny, not unlike the bars and walls of the cell. No doubt that wasn't a coincidence. The staff member not holding the jacket, older and apparently more senior, gave her the lowdown.

"Welcome, Gilda. What you see before you would have made Houdini weep - it's easily the toughest personal movement inhibitor on the planet. We struggled to put as much as a tear in it with the most potent equipment at our disposal. No doubt you've got the capability to give it a more thorough test, if your last assignment was anything to go by."

The corner of Gilda's mouth rose in a smirk.

"Mhm, I expect so. Should be straightforward. Have the cameras ready, wouldn't want you to miss anything."

She strolled up to the little 5'4 pony holding the jacket, her footsteps perceptively shaking the room. He gulped, and tentatively stretched out his arms as a big hand took a hold of it. She brought it up to her eyes and studied it. It didn't look quite the same as the cell walls - there was a new, brilliant luster. Sort of akin to carbon fibre, there was a weave running through the material, giving it a two-tone appearance - bright silver, and a darker, shiny grey.

"I should think," the older pony spoke up again, "this will provide a little more resistance, despite appearances. This has been in the works about twice as long as the alloy the cell was composed of. I hope it will prove more of a challenge.

Gilda would like that. She doubted it would be particularly difficult, but whenever her powers of strength and growth were actually tested, even to a limited degree, it was a pleasant and stimulating (albeit rare) experience. The older pony walked towards the door, turning just before disappearing.

"Oh, nearly forgot. The walls should provide a bit more resistance too. This stuff may look like plain old cushioned padding, but that's quite deceptive. We'd like you to try and crack open this little citadel. If you can."

He smirked, nodded, and walked out, door closing behind him. Gilda snorted at that last remark. Still, should be fun! The remaining younger pony, aided by Gilda kneeling, put on the straitjacket, slipping her arms through which stretched out to accommodate her size. The series of fasteners and clips along the back clicked and clunked, and with that, he joined his superior outside, the door closing behind him with a satisfying whump. Gilda was left alone, kneeling, in the centre of the room with her arms wrapped across her chest. This was the nearest she'd come to feeling restricted for many years.

She started off with a test of the jacket's strength, trying to pull her arms out of the jacket's embrace. It budged, but returned to its normal shape when she stopped putting effort in. So, she was going to have to put some effort in. That was a novelty!

She forced pounds of thick brawn into her frame, building upon her physique until she was beyond toned. The jacket seemed to grow with her, gaps between the fibres developing and accommodating for her bigger bulk but not giving. She made her entire body enlarge, and kept piling on the muscle. Still it grew with her, the material proving remarkably stretchy. She stretched past teen feet, now almost as wide as she was tall with the enormous muscles bulging all over her. Biceps and triceps the size of yoga balls, traps that a man could sit on, diamond-hard abs that could resist a cannon shell. And still the material stretched.

It was starting to give out, though. She had an idea to deliver the coup de grace. She forced a great deal of muscle into only her arms, and they bulged obscenely. This seemed to surprise the material, and the line between the areas that needed to rapidly stretch and the areas that didn't was suddenly subject to a great deal of force. At the same time, Gilda lifted her arms up and out, and managed to pull the fasteners off, allowing them freedom of movement. She focused on her cocks next, expanding them to an enormous size in mere seconds, spearing the material in the crotch and violently tearing it apart. The material the other side of her midsection was torn asunder as she piled pounds of meat into her ass, the great, fat, burgeoning ass cheeks rising like yoga ball-sized loaves in an enormous oven coming into the open as they pile-drove through the seat of the suit. With another surge of growth, all over this time, the game was up. The material groaned and screeched as the metallic fibres were dismantled. Gilda was satisfied. She hadn't found it particularly difficult, but she didn't achieve a breakthrough with zero effort, and that was an experience she'd not had for a long time. Her next task: breaking out of the wall.

Her size doubled rapidly, her bodybuilder-shaming amazonian frame sprawling out across the floor as she grew and grew. She soon had her hands against the ceiling and the soles of her feet pressing against the wall - both parts of her body perceptively pushing the metal away from her. But it was her glorious dickmeat, those ebony shafts of unparalleled rigidity, that whacked against the wall and began to push into it like a finger being poked through butter. She flexed her kegel muscles, her dicks fattening and throbbing with unbridled power as they grew longer and thicker and harder. With a little pistoning of her hips, the metal wailed and tore, her fat mega cocks spilling through the wall and into the next room. She sighed in pleasure, the hole in the wall forming a tight embrace on her shafts as she happily blew hundreds of gallons of jizz into the cell next door.

"Uh, nice work once again, Gilda. I think you've earned yourself a break. Come back to reception in half an hour, I've got something else planned."

Gilda spent some time in the recently-completed prison staff cafeteria, receiving a meal large enough to feed a few dozen ponies that should keep her satisfied for a few hours. Growing sure made her hungry! Her enormous body was a little too large to squeeze in beneath the fixed table, and her giant ass would probably swallow up the entire stool like a little butt plug, so she sat on the table instead which she covered up much like a normal person would cover the stool.

A short while later, she found herself in a room with peculiar equipment built into the walls and suspended from the ceiling. She had been sent further into the bowels of the prison, where the most technologically advanced and powerful equipment was being tested - perfect for perhaps the most powerful being the designers could call on that they had at their disposal today.

A couple of scientists had given Gilda the lowdown. A large, lazily-spinning metal object resembling a television aerial sat in the centre of the ceiling. Smaller copies of this antenna sat at the top of each of the four walls, rotating at the same RPM and emitting an almost-soundless hum. The purpose of this equipment was, they explained, to inhibit an increase in mass of living creatures. In layman's terms, it should make it very difficult (impossible, they hoped) for Gilda to grow while she was in this room and the equipment was running.

They barely had an inkling of her godlike powers, unique as far as she was aware, so they were perhaps more optimistic than was warranted. That didn't have to be a bad thing, though - in fact, giving the staff an idea of the technology's limits would be very helpful. And no doubt the big, tawny griffon would reach that limit and smash through it.

The equipment was deadly to regular ponies due to the incredible pressure it exerted on the occupants of the room, something that a hyper grower could sustain from the abundance of potent potential mass and energy locked inside them that even when it wasn't being utilised still existed in a latent form. When she was alone, the heavy door was sealed and the equipment hummed to life at 50% power, Gilda felt as though she'd been performing light exercise for a few hours, her limbs a little heavy and a slight physical fatigue coming over her. She began to flex the mental muscle that allowed her to grow, but instead of rising up a foot or two she barely gained a centimetre. Her body felt like an overstuffed sausage casing - all that effort put into growth was still trying to let itself out, but it had nowhere to go so just lingered within her. She put more effort in, enough to make her double in size under normal circumstances, but she gained three inches. Again, she put in enough effort to create what would be an enormous growth spurt, perhaps six or seven hundred feet, but she just managed to reach eleven. By now, she felt an incredibly powerful sense of 'fullness', comparable to eating an enormous meal but present in every atom of her being.

It was a feeling she had no recollection of experiencing before. It was especially powerful in her crotch, almost as if a cock a kilometre long was locked inside one a few feet in length. Her balls felt a similar way, as if a lake of jizz was packed into a couple of beach balls. Fuck, she felt horny. So horny that she felt as though she could cum for a year and still feel full enough to burst. Still she tried to grow. Pints of jizz flowed from her sopping pussy, soaking the insides of her thighs and pooling beneath her. She juuuust edged herself up past fifteen feet with enough growing power to usually make the tip of her head feathers compete with a skyscraper, and her cocks large enough to flatten several city blocks. She had never, ever felt so sexually charged in her life. But she couldn't cum! She furiously jacked off, muscles in her arms flexing and slick with the sheen of perspiration. She succeeded in making her dicks feel incredibly good, but orgasm eluded her. She felt as though she was just on the edge of blowing an apocalyptic nut, but she couldn't do it. This was incredible.

She had an idea, though, one that the scientists may not have planned for, and may just let her take the upper hand. Shivering in orgasmic pleasure, cocks drizzling pre like a pair of partially-ruptured fire hydrants, she forced a second right arm out from the one already there. Then, slowly, what seemed to be an exact replica of Gilda began to emerge from her being, as if her soul was stepping out from within. This was no ghostly apparition, however - Gilda had spawned a clone of herself, and it had just separated from her, standing beside her and bearing a similar grimace to the original - a grimace brought on by overwhelming and unfulfillable sexual hunger. It seemed to be fully independent, but was in fact linked directly to Gilda's mind, and the clone was fully under Gilda's control - it was essentially more of her own body portioned off into a second form.

The scientists watched the energy readout spike. They had to increase the power of the antennae to keep up with Gilda's growth energy, which had just doubled near-instantly with the introduction of the clone. Their mouths flopped open as both the clone and Gilda repeated the process, each making copies of themselves. The energy readout doubled again. The antennae were now operating at full power to prevent Gilda (now Gildas) from growing past sixteen feet.

Four Gildas became eight. The antennae were losing ground rapidly. The original Gilda grinned salaciously as she stretched her arms out either side of her, rising up to forty feet, just below the ceiling. Her throbbing cocks began to multiply now, the pair of dark shafts splitting into a pair of pairs, swelling and stretching and rumbling ominously as they vomited out great gouts of thick pre-jizz that began to gather on the floor of the room.

"You certainly put up a good fight," she said to the large central antennae, now at eye level, "but I guess this bird was just too much to handle. "Well, birds..." the octet of griffones said in unison, the rest happy to kiss and fondle and grope one another as Gilda's over-abundance of lust and lewd thoughts filtered into their minds. As the energy levels rose exponentially, leaving the computer software scrabbling to keep up, the scientists hastily evacuated the observation booth and encouraged anyone else in the nearby rooms and hallways to do the same.

Gilda reached out with one hand and quickly clasped her fingers together, stopping the central antenna. Four of her clones did the same with the smaller wall antennae. Then, with a final, satisfied smirk, all five closed their boulder-sized fists, crumpling the machinery and sending forks of electricity dancing harmlessly across their feathered hands.

"Ohh, fuck."

All the Gildas groaned in orgasmic bliss as all of the trapped growth was suddenly freed. Gilda cried out in ecstasy as her forty-foot body exploded in all directions, along with the clones. This wing of the prison was obliterated as they tore through the roof, rising up thousands of feet into the air in seconds, their overcrowded loins packed with thick, fat, overstuffed cocks and balls jostling for space. Columns of jizz the width of office blocks blasted off into the stratosphere. No effort, physical or otherwise, was required for Gilda to reach this mind-numbing orgasm, the backlog of spunk combined with the sensation of relief and release as her restrained growth tore into reality was much more than enough to make her cocks explode with cum. She collapsed to her knees, slack-jawed, jacking off a couple of shafts amongst her cock bouquet as her conglomeration of testes tried in vain to empty themselves. There was a thundering rumble as ropes of jizz she had blown a minute ago crashed back to earth, splattering the desert several kilometres away with millions of gallons of steaming jizz, her seed completely altering the landscape. She felt everything her clones felt - that meant eight impossibly enormous orgasms, only sending her to greater heights of pleasure.

None of them could stop cumming. It would be like trying to plug a hole in the Hoover dam with a sticking plaster - this load would have to run its course until the backlog had been unleashed. The clones strolled over, their cocks swaying to and fro and still blasting jizz, and began stuffing Gilda’s cocks up their enormous, squirting pussies. Their bellies bulged out in mere moments as Gilda’s explosive orgasm stuffed their wombs full of her seed. Gilda’s eight cocks each had a clone’s pussy wedged over them, flexing and relaxing and squeezing and caressing her shafts, sending her to greater heights of pleasure. Her hips gave a hard jerk as the pleasure peaked, the sensation of having dozens of kilometres worth of dick meat stuffed into divinely soft, puffy pussy was approaching incomprehension even for the veritable goddess of sex she was. The apex of the climax washed over all of them, the columns of jizz growing in size as their balls worked overdrive to blow out the last remaining dregs of the backlog, never mind what was in their testes after that excess of built-up cum.

Finally, the Gildas felt able to wind down the orgasm which had gone one for the best part of twenty minutes. Their balls were still full of jizz (when weren’t they?) but the uncontrollable urge to cum had passed. The desert had been reduced to a white, frothing sea of griffon spunk. The prison complex was looking a little worse for wear, white waves splashing halfway up the walls of the eighty foot tall cell blocks.The clones were content to coo and sigh as the powerful afterglow sent waves of pleasure up and down their bodies, flexing their ass cheeks and gyrating their hips over Gilda’s still-hard cocks.

Gilda leaned back and rested on one arm, peering down at the prison buffeted with rivers of thick jizz that were flowing throughout the compound. Her mountain-sized boob flopped across her chest and smashed against the ground, creating a small tsunami of jizz that broke against the compound wall and surged over it, filling the courtyards and fields with a fresh layer of cum. A nipple large enough for a truck to drive into oozed milk that mixed with the sea of spunk. She grinned at the throngs of ponies stranded on the roofs of several buildings, gazing up in wonder at the feathered goddess above.

“Guess you could call this a breakout. Hope you got what you needed!”