Pumping Up

by Megapone

Rating: mature
Tags: Anthro
Length: 4725

A stallion experiments with an air pump while his marefriend is away. Full-body expansion and full-body pleasure follow.

A stallion experiments with an air pump while his marefriend is away. Full-body expansion and full-body pleasure follow.

Contains: Anal insertion, air inflation, cock/balls/belly/muscle expansion, hyper genitalia. A Patreon snippet for Icicle Frost.

Published 1970-01-01 00:00:00 UTC
Last updated 2016-09-30 18:49:36 UTC

Pumping Up

Icicle sucked in a breath, his chest tightening, as he felt the tip of the air pump first prod against his ass. Carefully, biting down on his lip, he forced himself to relax. Seconds later, his enthused, winking asshole happily gulped the rubber nozzle down, the pressure of it a gentle echo what Midnight tended to put him through.

Still… He wiggled his toes, and squished his plump ass further against the mattress. The nozzle pushed up into him, firmly lodging itself in his rump. He gave his tight ring a squeeze, and squealed happily as a familiar resistance pushed back. His cock firmly hard and throbbing against his belly, Icicle smiled, turned to the pump, and flicked it on.

There was an instant rush of pressure up and into his middle. Icicle groaned lewdly, cradling his gut with both arms as he felt the tightness in his ass redouble. Then, with gentle awe, he watched as his belly began to bloat out with air, its curves growing rounder, tauter, yet light, pulling him and relaxing him rather than forcing him down. His stomach trembled, each pump of air inside his ass making it swell larger in size, pressing his wiggling cock down and straight. He giggled airily, giving his belly a squeeze, and grinned when it barely even squished.

Already looking like he’d downed a meal fit for a family of four - or else grown pregnant for ten months - Icicle let out a grunt as he felt the pressure begin to flow to other parts of his body. A swell of motion caught his attention in the corner of his eye, and he held his arm up, noting with awe that it had begun to thicken as well. His eyes widened, bulging from more than air.  Both arms were inflating larger: biceps that had once been flimsy, floppy little things were rounding out, packing on what looked like pounds and pounds of meat as their radius swelled larger by the second.

Icicle let out a squeal of delight as the welcome pressure in his rectum doubled and redoubled again. The speed of the pump was picking up, the influx of air into his body intensifying. A groan slipped - or forced - past his lips as he moved his broadening hands down to his smoothly, rounded belly, his gut fast growing past the capacity of his lap to hold it. A wide, inflated sphere heavy with dense, well-packed air sat above a pair of thick, curvaceous thighs that even the sexiest of porn queens would kill for.

He giggled to himself as he caught sight of his reflection in the mirror. His buff arms flexed and peaked, their radii passing the thirty-inch mark as a pair of balloon-like pecs pushed out from his chest. Both of his pecs were fast approaching Midnight’s lovely breasts in size, and rested comfortably on the horizon of his belly. Said belly was, of course, far larger than it’d been mere seconds previously - with the constant influx of air from the pump below, he’d long since passed “pregnant” and was now starting to better resemble “fat” - except for the fact that there wasn’t a single fold of flab on him.

Icicle drifted back on the bed, chest heaving as he inhaled greedily. His cute asshole clenched and puckered around the insistent nozzle, his thick asscheeks clamping around it as they, too, bloated up larger and larger. Up and up he rose, his flanks thickening as each cheek of his growing, wobbly ass widened into a massive, soft pillow. Icicle struck another flexing pose, grinning as the veins on his reflection’s muscles bulged out hugely, in sharp contrast to the gently rolling, enormous curves the rest of him was gaining.

An intensely pleasurable sensation reminded him that there was something else growing, too. Icicle gasped in ecstasy, his eyes briefly rolling back with pleasure as he felt an incredibly sensitive hum of pleasure somewhere beneath the weight of his swelling gut. Seconds later, he saw it: a simply enormous, pre-drooling slab of stallion meat poking out from beneath the shadow of his balloon-shaped middle. Icicle moaned, feeling his luscious legs pushing apart as his already hefty nuts groaned and grew, demanding space, their contents sloshing as their volume increased to quarts, and then gallons.

He’d never felt such a nexus, such a bombshell of sexual pleasure. Groaning delightedly, Icicle began to knead and fondle his growing gut as its diameter passed his muzzle for height. He had to lean back, pressing himself heavily against the bed as his ass ballooned up and his belly weighed against his chest. It spilled over his lap - over everywhere, really - now, an enormous, bulbous sphere of wobbling curves and mass. Each twitch and shift of his hips frotted his growing cock against it; by now, though he could no longer see it, Icicle felt sure that his stallionhood must be at least two-thirds as tall as he was, and growing. The stream of precum dripping from his slit had fast become a river, a spray of its own, and his panting thrusts echoed the mechanical hum-thrum-fwum of the air pump as he grinded his shaft against the underside of his inflated gut like a mare in heat.

His asshole winked delightedly, its obscene suction slurping in even more of the nozzle into his rump. Icicle moaned, his eyelashes flittering as he jerked his hips forward and back. With each thrust, he felt the airy bloat of his eight-foot belly pressing down against his trembling shaft; with each pull, he felt the nozzle spread his ass even wider, the pressure of it pressing every one of his buttons as he let it fuck him mercilessly.

Fevered moans mixed with messy slaps as Icicle’s ass began to lift him completely off of the bed. He continued to frantically knead his belly, by now large enough to fit three or four ponies inside without breaking a sweat. The lovely air pressure - the pure tightness of it had him wheezing, sweat streaming down his face as his cock trembled and flexed. His nuts had to be the size of beach balls now, his “pecs” half again as large. Whimpers and soft, piercing moans slipped from his full lips, half whistles of escaping wind. His ass grinded against the nozzle as the air pump finally reached a roaring crescendo of pressure.

And as that pressure grew, and grew, and grew, Icicle felt a similar urgent tension building somewhere else. His shaft lurched, the muscles at the base of his cock locking up as he felt an inescapable rumbling begin deep in his balls. His arms and legs splayed wide from their massive thickness, his whole body dominated by his mountain of a gut, Icicle felt his jerking thrusts pick up in speed, his whole body slaving away to reach that final, incredible climax -

With a squeal of absolute pleasure, Icicle came. Thick ropes of spunk spewed from his shaft, painting the opposite wall and underside of his wagon-sized belly white with jizz. His massive balls, each one large enough to hold an ocean of seed all its own, were more than happy to share their load, making each eruption of spunk larger than the last. The tightness in Icicle’s body only intensified his pleasure, his eyes opening wide with joyous abandon as his thick limbs flexed and clenched, still massaging every inch of his gigantic body that they could reach.

Finally, Icicle felt himself coming down off of his peak. His cock gave a few final spasms - once, twice, three times - and then fell to a shuddering halt. With a grunt of effort, he rolled over onto his belly (which was now large enough to lift his body nearly to the ceiling) and, with some difficulty and no little regret, jerked the air nozzle out of his ass.

The pump fell silent a beat later, its motors winding down to a low, purring ambiance, almost smug. Icicle panted, his tongue lolling out of his mouth with exhaustion as he felt his enormous cock pressing between the mattress and his gigantic gut. He rocked his hips gently, and half-giggled, half-moaned when he felt a twinge of phantom arousal surge in his over-bloated body.

The weight of his pony-sized nuts was his next distraction - at least until the faraway sound of a door clicking open reached his eardrums. “Icicle?” he heard Midnight call. “I’m home!”

He blanched. Oh, no. Midnight couldn’t - shouldn’t be allowed to find out about him like this. To his rising horror, though, he realized that his belly was just too big to let him roll back down to his feet...and his ass had grown round and hefty enough to lodge his body firmly between the bed and the ceiling. He was well and truly stuck, incapable of doing anything but wiggling in place until he deflated like a balloon.

Icicle swallowed as he heard Midnight’s steady footsteps approaching. Well, he told himself, grinning nervously. Maybe she wouldn’t think too poorly of him…

Far below him, his cock gave a monstrous, lustful lurch. Icicle moaned as a healthy spurt of cum splattered against the far window, covering it completely.

Well, he thought, as Midnight’s hand began to turn the bedroom doorknob. At the very least, if she wanted him to be...he was very usable.

Getting Caught

“Well, well, well.”

Icicle grunted, squirmed atop his water tank-sized belly. His puffy arms and legs wriggled uselessly, each one blown up to nearly the size of a pony themselves. No dice. He grunted, exhausted, as his bloated belly rocked gently over the wreckage of his bed.

In the corner of the room, he could hear Midnight’s footsteps come to a stop. He couldn’t see her over the enormous curve of his rotund belly. He groaned, then a low belch burst from his lips, a tiny fraction of the extra air in his body escaping from his taut, over-stuffed coat. Below him - though not too far - he heard Midnight giggle.

A few more even footsteps brought the top of her swirling, starry mane into the bottom of his vision. “What,” she murmured, glancing up at his grossly swollen body, “have we here?” A smirk played across her lips, a glint of surprise and mischief in her eyes.

Icicle grunted, then collapsed on top of his ten-foot belly. Panting, he grinned weakly down at his marefriend. To be honest, this was rather a new perspective for him - at seven feet even, Midnight was far more used to looking down on him, the top of his six-foot head barely reaching the top of her expansive bust.

And oh, what a bust it was.

Lovely, perfectly round tits stretched out a bust that could have held a foal in either cup, each one ripe and perky enough to squeeze. A pair of slender, manicured hands nestled neatly against Midnight's wide-flared hips as her impressive biceps flexed and relaxed idly. Her dark-lidded eyes flickered, and he caught sight of the deep, reptilian pupils dilating within them, eyeing him with a mixture of mirth and delight.

"You're certainly quite a bit bigger than I recall, Icicle," Midnight said, tasting the words deliciously. She took a step toward him, her thick hips swaying as her luscious thighs rubbed together. She stopped just before the gigantic curve of his belly, paused, and then placed a palm against his coat. Icicle exhaled, the tiny spurt of air barely enough to relieve any of the titanic pressure that had swollen him up to this size. Midnight bounced her palm against his taut middle for a moment, fingers flexing lightly as a smile twitched at her lips.

He chuckled, more than a bit awkwardly. "Um," he said, blushing. "I s'pose so, yeah."

"And - oh, my." Midnight's other hand went to her lips, and she slid her palm up around Icicle's bloated navel. He grunted, gasped for breath as her fingers brushed across his cock's shaft, so bloated with air and swollen in size that it could have fit two ponies inside, side by side. Nearly ten feet long and almost half that across, it was a monument of pulsating, flexing masculinity. Even drooling with spunk from his prior ejaculation, it was still throbbing with an arousal that Midnight's gentle touch only worsened.

His cock stiffened at her touch, his flare pressing upward against the ceiling as he ogled her massive rump shamelessly. From this perspective, the whole of her body was laid out before him - her huge, sculpted shoulders, her wide, foalbearing hips, her big, bouncing booty. So jiggly were her cheeks as she leaned forward, hands stretching wide around his flare, that he felt his balls swell at the sight of them. Icicle moaned, his titanic length growing longer and thicker still as his hundred-pound testicles crushed the debris of their bed further beneath their weight.

His cock was oozing so much pre that a normal pony would have found themselves drowning in it; Midnight, though, kept her muzzle open, slurping, drinking down his arousal as she explored his mountainous manhood with both hands - and both arms. Her breasts pressed gently against the underside of his member, turgid nipples pressing against the engorged veins of his length. Slowly, chuckling softly, Midnight began to jerk him off with her upper body, both muscular arms wrapped lovingly around his chode as her breasts smooshed beneath his rock-hard length.

"But how..." she murmured, her expression vacant. Icicle saw her vision drift over to the side, where his pump lay. Eyes widening with sudden glee, she caught sight of the nozzle; a moment later, Icicle felt a hard, wide-palmed telekinetic force spank him across the rump.

"Such a big boy," Midnight purred up at him. His cock throbbed appreciatively in her grasp, drenching her in another flood of precum. "You've been such a *naughty* colt."

With the ease of a practiced accomplice, she disrobed, her dress flowing off of her figure like water. Icicle groaned aloud, the warmth of her clit grinding against his flare suddenly more than he could bear. Smiling as though she knew a particularly juicy secret, Midnight leaned even further forward and laid a kiss across a particularly fat vein on his shaft.

Her hands found his belly, squeezed it appreciatively. So *taut*. He groaned, belched. Midnight laughed softly, her voice deep and rich like velvet.

"My little colt wanted to get bigger," she rumbled. Her nude breasts ground wonderfully against his cock, her cleavage spread just wide enough now for her nipples to press against his ballooned belly. "But he forgets that his mistress is bigger still."

Lost in a haze of lust, Icicle could scarcely respond to Midnight's words. He blinked blearily down at her, then moaned as his cock seized up again. Pre drooled down his shaft in waterfalls, cascading over Icicle's tits in a wash of milky-white. He'd cum just moments ago, and already his huge balls felt full again. He couldn't see them, but he could *feel* them, a pair of twin orbs the size of whole ponies that were already bloated, sloshing, and gurgling with an excess of seed.

So caught up in the throes of his own arousal - and, simultaneously, unable to tend to himself, given how big and bloated and *useless* his massive, bulging limbs were - Icicle barely even noticed it as Midnight's lip curled upward, her head beginning to slowly inch upward in the air. Her shoulders broadened, arms and legs thickening to the girth of tree-trunks themselves, as her enormous bust grew upwards, downwards, and ever-outwards, her mountainous tits wrapping lovingly around his cock as her entire body lengthened.

Shimmering waves of deep-blue magic flickered around her coat, sparkling with the light of distant stars as the already-amazonian Midnight grew into a *giant.* Beside Icicle's enormous, inflated body, any pony would seem small...but Midnight's steadily growing form left her more than a match for him. Her bulging, perfectly sculpted physique flexed with obscene power, her tits pushing outward as her height passed eight foot, moving over nine without even breaking a sweat. The floor creaked and groaned as she passed *ten* feet, her looming, tight-packed body matching his for weight as eleven feet, too, became a distant memory.

His eyelids fluttering, Icicle groaned softly - and locked eyes with a grinning, twelve-foot alicorn. Licking her lips, Midnight fluttered her own eyelashes and blew him a soft kiss.

All of the blood rushed to his face. Below and above him, his cock throbbed. Even now, she looked down on him, her horn and ears pressing against the ceiling as her massive bulk filled up the room. Beside her, he felt - not small, but round, his gigantic muscles almost paling in comparison to her awesome biceps.

He shivered as she leaned in close, her breath hot on his nose.

"I always thought you would look cute plump," she cooed. "This is even more so." She gave him a wink, grinding her huge, puffy clit not-so-subtly against his shaft. He groaned again, his toes wiggling in delight.

Still smiling, she turned her head to the side, where his monstrous, throbbing manhood gushed geysers of precum onto the carpet below. Already, an inch-deep sea of arousal had dampened the floor...and from the look in Midnight's eyes, it wasn't nearly enough.

"Mm." Icicle nearly choked as Midnight planted a kiss on the top of his swollen, bulging flare; his cockslit, drooling a river of pre large enough to drown a small stallion, seemed only to push his lover on with her steady lust. She grinned wickedly at him, winked. "You smell so good when you're big like this," she purred.

She kissed him again, right above his slit. He groaned, eyes flicking shut as his rotund, immobile body rocked gently back and forth. Midnight pushed further as the flow of pre redoubled, her steady kisses moving up the width of his flare as her chin was bathed in milky-white pre. Icicle gasped as her luscious, full lips pressed against his slit - and then moaned, whimpering and helpless, as her tongue lashed out to lap at his overflowing slit. His moans filled the air, melding with her appreciative grunts and groans, as her long, almost prehensile tongue wriggled down the length of his shaft, his slit actually widening with each *blorp* of precum that he spewed forth.

A strange pressure - even more pronounced than what he already felt - filled him. Eyes widening, he realized that Midnight was blowing *into*, his slit. Her cheeks puffed out, red filling her dimpling face as she exhaled steadily into his mountainous cock. His enormous stallionhood grew even more so, his cock and balls thickening, lengthening, as his massive marefriend expelled her breath into his over-inflated genitalia.

He felt...hot. Tight. *Stretched*. As he squirmed, he felt the ceiling crack above him. The bed groaned, the bedposts splintering beneath his massive, growing weight. His cock and balls swelled up with each breath Midnight puffed into him, the veins on his shaft growing more pronounced, the contents of his balls sloshing and bloating until he felt as though each orb held an ocean.

Slowly, Midnight pulled back. Her muzzle dripped with his precum, her face painted a clear, milky-white with his arousal. She pulled in a low, shuddering breath, and gave him a sultry little smile.

Just then, his cock bulged, lurched in her grip. A thick wad of precum - not spunk proper, but large enough in volume to have been twice the size of one of his prior loads - splattered all over her face and huge, busty cleavage. He stared at her in horror, flushed, panting with pent-up need, as she licked her lips and cheeks, her long tongue flicking almost teasingly against her chin as she lapped up a thick glob of his arousal.

"Horny, dear?" she purred. She wrapped both hands around his massive shoulders and grinned.

He swallowed. Far below him, beneath his room-sized belly, he could feel his balls rumbling with pressure.

"Y-yes," he mumbled. Midnight's smile only widened.

Big and Sexy

Before Icicle knew it, Midnight was leaning forward again toward him. Her lips puckered - and then settled into a suckle around his own lips, kissing him deeply. Icicle moaned into it, letting Midnight's much larger tongue invade his muzzle and savoring the power of her oral muscles as she kissed and fondled him to her heart's desire. Her great, hefty giantess' breasts, each one large enough to hold a full apple cart, squished like water balloons against his air-swollen belly, the pleasure of contact more than enough to make his little, useless limbs flail in near-ecstasy.

And then she began to blow.

It started as an exhale - a gentle sigh, almost - but soon picked up into a much stronger gust of wind. His marefriend's lungs, likely larger than he'd been before beginning, inflated powerfully as they pushed her mega-tits further out against his bloated belly. Then she exhaled, breathing out right into his muzzle - and, by extension, his gut.

Icicle groaned as his marefriend forced him bigger. His belly began to expand, his size further fueled by Midnight's oral ministrations. His shoulder blades pressed harder against the ceiling. He heard the crack of plaster - felt the tension against his back suddenly give way. The floor was groaning, the walls creaking as his massive belly and form expanded to fill every inch of their overstuffed bedroom -

With a mighty crack!, the floor shattered. Icicle found himself tumbling downward - before rebounding, bouncing off the ground floor like a giant beach ball. He thought he heard the crack of his splintering sofa beneath his mega-gut, but it might as well have been the bite of a gnat for all he felt it. His belly depressed, and then expanded again, its incredible pressure hungry to assert its dominance and size over its new environment.

Midnight didn't descend so much as grow downward. Her size increased as she fell, and she stepped gracefully onto the ground floor at the same time that his bubble-blown booty bounced against the top of the ceiling. She caught him, spun him, then laughed softly at the dazed look in his eyes.

"Enjoying the ride?" she purred.

"Yessss," Icicle slurred. Midnight's smirk grew wider.

"Good," she said. "Because you wanted big - and you're nowhere near big enough!"

This time, he expected her muzzle on his lips - though he hadn't quite expected her slender, gorgeous hand wrapping around his hypercock. His shaft was nearly half as wide as his belly by now; as she exhaled into his muzzle again, he felt every part of him growing bigger, growing wider, growing stretched. Icicle drank down the air and size of Midnight's gift greedily, like a foal guzzling down it's mother's milk - and Midnight was more than happy to provide.

Her cheeks puffed out, pulling in all the air she could - and then she breathed it all out, forcing her load down Icicle's esophagus and into his oxygen-bloated belly. Icicle's hooves wiggled happily - and then froze as he felt his sides press against the walls of his house once again. His and Midnight's expanding forms had rolled over each wall, each floor, each item of furniture until the building was little more than one gigantic room - and now, even now, it was about to become too small for the growing couple.

With a great, splintering crash, the house burst around them. Icicle's nostrils flared, his eyes widening as he toppled backward. His gigantic, roly-poly form bounced and rolled over the wreckage of his house. He settled in the debris-scattered remnants of his front yard, his air-bloated body taking up the entire space, with his head around the same height as the second story had once been.

And over him loomed Midnight, her deep indigo hide gleaming in the sunlight. Her enormous nude form was lewdly and shamelessly displayed before the neighborhood. Her tits, each a dozen feet across, bounced and wobbled at the level of the highest roofs on the block; her eyes, narrowed and slitted with lust, towered above the trees.

"Poor little Icicle," she cooed. She took a step forward - and the ground shook. "So big and plumped-up and round" - she took another step, and the earth rumbled - "that you can't even move." Her muzzle curled into a smirk, and she stopped just before his tremendous, twenty-foot ballsack. "I suppose it means I'll have to take care of you."

Puffy cheeks puffed out further. Icicle gasped, trying to hold all the air inside of him in. "Y-yes, please!"

Midnight's smirk split into a predator grin. "Mm," she crooned. She leaned forward, placing both cart-sized hands along his swollen, throbbing stallionhood. Twenty-five feet if it were an inch, it loomed above the both of them, pulsing as if possessed of a heart all its own. "I'm sure you'll make a wonderful pillow."

He grinned. "F-for a goddess like you?" Her eyes flittered down at him, and she began to nuzzle her cheek against his throbbing cock. "A-absolutely!"

"But of course," Midnight cooed. "You're just so tubby and plump." She leaned forward until her breasts were wrapping around his mountain of a member; slowly, she began to shift her weight onto his house-sized belly, pulling herself up along the length of his shaft until she could position her mega-marehood over his hyper-cock. "Ooh - oh!"

Icicle sucked in a breath - inflating an infinitesimally amount larger - as he felt his fat flare pierce his marefriend's pussy lips. Midnight moaned, her spine arching as she slid herself down, spearing herself on his meat. She groaned, both hands moving up to rub at the bulge in her belly where his cock strained against her velvet insides. Then, slowly, humming and stroking her overstuffed womb, she leaned forward and down against him.

Her belly pressed against his. Hers was hard, but hot, filled with his meat. His was softer, cooler, bouncier. She growled playfully under her breath, grinding her weight down against his - and then began to grow even bigger.

"Show me a good time, big boy," Midnight growled. She leaned forward, took his muzzle in hers, and exhaled.

Icicle groaned in elation. He could feel her weight increasing - at first slowly, then doubling, then tripling. He could feel his member growing smaller inside of her - but no, she was getting bigger. But the next exhale pushed him larger still. He inflated, squirmed, wriggled, as his every limb and belly were inflated to bigger and bigger sizes -

With a whimpering grunt, he unleashed his orgasm. Midnight cooed lovingly, her tongue twirling around his, as his hot, steaming load of sperm gushed inside of her. He could feel her womb drinking it down, swelling, bloating, sloshing until she looked heavily, impossibly pregnant. He could feel the tide of his own semen churning around his cock, weighing against his belly through the overstretched hide of hers. He could feel her cunt welcoming each flex of his shaft as her walls clenched and flexed and grew and grew.

More air. More size. More weight. More air. He was feeling so tight - so bloated - so full -

With an earthshaking pop!, he blew. His body, which by then had grown to swallow up most of the property, exploded from the sheer pressure of all the air that had been forced inside of him. It was simply too much.

Midnight groaned. Her giantess' form sprawled across the front and back yards, her abused cunt leaking her mate's seed all over the wreckage. "Unf," she murmured, kneading her hefty cum-gut. "I-icicle?"

She felt something rub against her midsection.

She blinked, then glanced down. Great tufts of hide and fur floated down through the air, the remnants of the explosion - and there, at the center of the storm, was a tiny, pony-sized Icicle lying prone on her popped-out, pregnant-looking belly button.

Midnight smiled, then lifted one five-foot finger to stroke his unconscious body gently. He squirmed beneath its weight - but then relaxed, moaning happily in his sleep.

"That's my Icicle," she murmured, petting his little body. "Just big enough."