My first ever commed story! New territory so I didn't know what to expect. In the end... this turned out great!

Expect some good tf, big flipper feets, big tail and lots of getting bigger in this story!

Thumbnail is from this art piece I got

Written by   lunarkeys

THE STORY
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“…yeah, looks like the alley’s closed, too. Tournament day coincided with a birthday event takes up all the lanes.” The luminari shrugged, setting the phone back down. Jordie found himself taking an extra long breath to keep himself from cursing.

Maybe the fates hated him. He’d come all this way to the manor, trying to be as normal as humanly possible in front of the magician. No, collar manufacturing was neat but not really his thing. The aviary was vaguely interesting, though he figured if he wanted that, he’d probably just go to a zoo proper. The rose garden was – well, he didn’t know how to feel about the idea of the rose garden yet.

Which left activities on a more reasonable scale. What was in the area? He’d not done the research, and opening with ‘look basically I couldn’t stop thinking about that time that I got into the coat and then grew flippers so big that my brain just kinda blew up from the sensation’ was exactly what he was trying to avoid projecting to the crafty luminari. He had kept his expression deadpan, serious, fixated on the vaguely vulpine expression, never allowing himself to look below the knees.

But now he was out of generic areas to hang out in. Which meant. Um.

“Oh, I had an idea, actually.” Keys piped up. Jordie let out the breath he didn’t realize he had been holding. The fish’s smile was coy, which could mean anything from thoughtful to playful to teasy to-

He should respond. “Yeah?”

“Well, it started with a little something like…this.”

The motion was almost too quick to process; the blur of fishy fingertips spread in an array of arcane gestures, and the dance of blue sparks from one fingertip to the next. And then the touch of fingertip to his spine, and his senses scrambled all at once. His eyesight blurred as tingle of electric blue raced down his body. A spasm took him from standing to stumbling, and the thump-thump-THUMP of frantic footsteps, a perilous lurch of his heart as he thought he might fall, and the abrupt slam of hands finding the wall, his nose stopping just shy of meeting it more intimately than he planned.

He turned halfway, looking behind to gasp out “What was TH-“ before he caught the arched lean of his shoes.

Oh. Oh.

The sneakers were distending, warped with the pressure of growth. Up front was the mash of toes tightly enough that he could almost see the way the digits were morphing, flattening as webbing began to draw between each toe. There was a tiny squish of softening flesh as the leather stretched in pointless protest, and then a crack-SNAP of laces bursting apart, one-two-three-four-five.

POP, and the front of the shoes blew open practically simultaneously.

The left set was already almost all changed, though he got quite the view of the right just starting to deform flatter, more flipper-like before Keys knelt next to him, prodding at the underside of each shoe, azure sparks dancing between his fingertips. Jordie gulped a breath as the next touch burnt straight through the leather and underlying fabric, pricking the underside. It took the next breath for the veins of cetacean rubber to race along the underside of each changing flipper, then just two more for the sides of each foot to clamp, vice-like over them before the crackling burst of them erupting fully free.

Oh, god, what a show.

But the smaller luminari – goodness how he was already thinking of himself as one again – seemed only to be getting started. Jordie bit his lip hard enough that he waited for the taste of blood as the fish’s fingers dug into the springy, pliant flesh, and he snorted air out of his nose as tendon snap-popped, pushing him up an additional inch. The damp texture was growing wetter, drawing in the droplets of the probing fingers as the webbing spread wide, the smallest toes upon each flipper glommed over with progressively more webbing as they deformed and strained, trying to keep up with the steady push of each flippered foot. A whimper, as he felt himself arch further upward, the luminari’s itching along the soles pushing crimson heat into his cheeks.

His eyes flicked from shoe leather to flippers and back again. They already had to be, what, half again as large? Another glance back at his legs, looking to find the strain of pants already tearing at the weight of thickened thighs and expanding tail, but he found only more of the flippers, still inching upwards, taking him with them. He must’ve looked a sight; awkwardly suggesting places to go, things to see just a minute ago, and now, trembling, shaky human body on increasingly huge flippered feet.

“D-did-“ He managed to sputter. “Did you…hHHf…plan this all along, or…”

“Oh, I was just making it up as I went.” The luminari hummed in response.

The fingers danced, and he swallowed as he lurched higher still. A tiny c-r-rRRk of tendon and bone interweaving and popping, pushing toes into a broader arch as hot breath spilled over his lips. How big was he going to make them? He opened his mouth to ask, to protest, to beg him to keep going, but the pleasurable push of flesh arched him higher still, and he forgot about what language to use for favor of a muffled groan. The feeling of growth, flippered feet steadily arching higher as his toes scrunched in the remnants of his socks, blotted out whatever coherency he might have been able to conjure, and the next surge took him over the two-foot mark.

“GhHhH…so…big…”

Thick puffs of expanding flesh squelched wetly against the carpet, and he again bit his lip. The pressure of growing sole pushing back against fingers was just so much! A squeeze caused his cheeks to fill out, and he was half-certain his nose blew steam at the poing of continued growth, the bulge of fresh rubber pushing his ankles up until they met Keys’ nose. It was like trying to keep an overloaded pressure cooker from bursting, and the thought that somehow, the changes were still confined to just those huge flippers did something to his brain. How much of this magic was just confined to the steady pop-snap of expanding feet, and how much was just waiting for something in his brain to -

-crack-

-the feet rushed up and over the luminari’s head, and this time, his mouth gasped for a breath, and something broke inside him. Whatever magic that brushed against his flippers raced like lightning through his ankles, tracing stray lines of teal over his legs and rump before tickling under his chest and throat. He could feel his mouth open, a croak escaping, and then the feeling of overpowering magic.
“URhk-“

The tail slammed from him, lump of pliant rubber forming around the tailbone before rapidly ballooning into thickened appendage and thumping into the seat of his jeans. The fabric resisted the first wave, only for the second – less than a moment later – to crush the seams in a ballooning burst of appendage. Tearing fabric echoed across the room as the seat of his pants blew out completely, his eyes barely able to follow the beginnings of flattening tailtip, outer spokes embracing webbed interior. The tail flew outward, pulled nearly four feet back before it remembered gravity enough to arch downwards towards the floor, crashing into the carpet with muted wumpf.

His breaths came in guttural gasps and groans. Another wave, and the tail skidded serpentine across the carpet, lunging from four feet to seven, eclipsing his growing height as his body remembered to play catch-up. Interweaving veins of teal rubber crossed back and forth as pant seams snapped tight against swelling thighs, the denim digging into the creasing skin for but moments before rupturing, tearing zipper-style up his legs as it exposed softening, creasing flesh. Jordie’s brace nearly toppled as he went to take a step forward against the growing pressure, only to find the rush of growing feet meeting the floor far too soon and sending him almost pinwheeling back to earth. The touch of fingertips seemed to magnetize him back to earth, and the surge of stretching flipper pushing his nose into the wall. A shuddered breath, another moan.

“H-how – how big is – whaA-Aah-AAHHh –“

“Like I said.” The fish’s eyes twinkling as he looked up, grinning. “Making it up as I go along.”

He didn’t know whether to be elated or terrified. Either? Both? Probably both.

The surge kept growing. The squeeze of flesh upon his thighs announced the beginnings of the support rods that built up his legfins, and the slow stretch of fins soon emerged as the disintegrating pants tumbled down over, briefly caught upon the fins before tumbling to earth. Jordie’s eyes bugged as he realized the pants wouldn’t even fit one of his feet, now, let alone his legs. The tail again poured from him, drawing furrows into the carpet as fluke twisted from edge to edge, then plowing into an impromptu scoop and catching, skidding, bumping over the carpet. A brief wince in anticipated pain as the tail thumped into an armchair, but the impact felt more a flick than a smash as it bumped away, and he realized just how big he was becoming. The teal stretched from flippertip up to just under his shirt, now, but the flippers alone had to be over three feet’s worth of still-straining tendon, pushing his head up somewhere in the vicinity of eight.

His torso, only just now starting to catch up, looked diminutive by comparison. A swallow as he felt his shirt begin to ride up, the veins of gleaming rubber exposed as they crept over his abdomen, what thin lines of human weight they could find consumed as they smoothed him further over into more a more overtly swimmer’s build. He took a half step – careful this time – and the shudder as flipper obediently grew back down towards the carpet, landing squarely in waiting fish fingers – forced a breath from him. He had some semblance of balance, now. Not much; he was still growing faster, the tail again lifting and cascading down, an idle sweep now pushing the armchair into a slow tip forward before it came crashing down. He grinned ruefully, looking down to make sure Keys still approved; it wasn’t like he was in control of his changes, after all.

“Aren’t you supposed to be enjoying yourself?”

He opened his mouth, trying for a witty reply, but none came. What was there? Hey, thanks for letting me come visit and turning me into an even bigger fish than last time. It’s, uh, it’s great. Fishtastic? Ugh.

“Y-y-yeah I’ll just – yeah.” He grimaced only long enough to flinch at the lameness of the response before the next step lifted him up to remind him at the flippered paws were still growing, and then his expression settled somewhere between a loopy smile and a dazed type of ecstacy. If Keys was endorsing him getting wild with it, well, why not get wild with it?

He braced, summoning up some intangible sense of inchoate desire, and pushed. “GnhAaAH….” His tail jolted and fins snapped to attention, bursting from the appendage as though they had been wedged inside all along, and the serpent’s length thudded into the far wall hard enough for the lamp overhead to shake. A sway – how he could sway that much, he didn’t know and didn’t overmuch care, now – and the chair was booted across the carpet, skidding over onto the opposite side of the room and knocking over its brethren like bowling pins. The loopy grin broadened, and he pushed again, the tail coiling and flexing, thickening over itself as the base bulged with new musculature, the heft injecting itself along its length as it fought to keep with his own growth.

The shirt was tearing, now, though he barely noticed; only the washboard-taut musculature of his building chest as more of the pale beige of his skin disappeared into luminari teal. Rubber swept onto his shoulders and rippled down his arms, and he squeezed into the wall just in time for blunted claws to dig into the plaster, feeling it scrunch underneath his shifting fingers as he grunted with exertion, relishing it. Goodness, but he was so big! The tail spooled like an unraveling ship’s anchor cable, twice his height and already racing to make it much more so as his stoop against the wall turned into a hunch, placing more of the weight upon his expanding flippers. The luminari’s fingers felt tiny, now – they had to be, as he eclipsed the double-digit height range – but the busy spark-driven claws dug in enough to draw forth a moan regardless.

Dignity increasingly felt less important than indulgence, and indulgence was looking all the more ludicrous as a result.

“Big…ggRrHHh…”

His head set upon the wall, glazed eyes only half-processing the distances and weight of billowing body. Moisture drew webbing tight between his fingertips, and an experimental flex clawed another chunk out of the plaster as his tail thudded into another wall, shaking a painting of some seaside view with a lighthouse free from its foundations. He willed the pak of armfins to life, and the same jolt of explosive growth adorning his tail erupted in short order. His tail sank in under itself, fluke acting as a wedge to slither under a coil and back over, and another groan escaped as the feel of couch compressing beneath a coil.

Another gasp, the briefest pinch of airflow as gills cut into his neck, and teal caressed under his chin. He pushed himself upright – oh, man, the flippers were enormous – and jerked as his head slammed into the ceiling. Hadn’t that been huge just a minute before? Twelve, thirteen feet? He was way beyond getting out of control at this point. Some prickly thought reminded him that his tail was turning furniture into kindling, that at his current pace, his ears were about to peek out of the ceiling.

He found himself not really caring. “BigGGH…HhHHRRRR…”

Teal lines were working into his throat, the sweep of rubber heavy enough that the thought of still having human cheekbones instead of his muzzle felt fundamentally wrong, somehow. He pushed his face into the wall with distinctly inhuman strength, a gleeful giggle escaping as the plaster again crumpled under him, and feel his head again slam into the ceiling. He barely felt it. Jordie hadn’t ever really been the destructive type, but the sounds of furniture turning into kindling, walls rattling with ever-more insistent tail growth, and plaster coming down around his ears were all reminders of bigger, bigger, bigger.

Were Keys standing at this point, he was pretty sure those flipperpaws alone would be bigger than the crafty magician. The fingertips were smaller than ever, but the magic – or at least whatever illusory capability the magic had upon the pleasure centers of his brain – felt more potent than ever. Jordie found his neck craned against the ceiling as his cheeks flushed in deep crimson, his ears tugging through the first few lines of deeper blue creeping through the sunny brown of his hair. His shoulders squared against the wall as he forced himself into a deeper squat, fixated ever-further upon the growth of weighty paws and tail, and his back contorted down until his rump was nearly high enough to reach the ceiling. The tail squished and squeezed against itself, roiling in its fervent cascade of unending growth. Had to be three times larger than he. Four? Five? It felt like not enough. It was a leviathan of playful coils and fins adorning its sides, a sea unto itself.

“BiG-GGUuURRR…”

Was that still his voice? A drunken giggle escaping as his butt met the ceiling, the latest surge of tail growth knocking against the boards beyond the plaster. The room was an increasingly tight box, filled far more with his bloated body than any semblance of whatever fineries had decorated it before. Keys somehow kept up his merry work beneath him, tucked under a tail loop. Maybe he had something keeping him from getting squished in all this mess. Some ward, some innate reality-diversion that let him continue tantalizing him ever-closer to breaking free.

His nose was dampened, now, his tongue slipping from his mouth as he groaned louder. The ears were unspooling, stretching broad into similar fins as those adorning limbs and tail. He was close. Close to filling the room utterly. Close enough to being changed properly, being back to luminari – albeit one that defied the physics and logic that normally made up the form.

Close enough to breaking that he –

“hhGAH-“

And then the room broke.

He hadn’t even realized he had dropped to hands and knees, but his head was still rubbing against the rafters as he heard the crunch of wood paneling snapping, and then the arms were no longer pushing against so much as through the wall in front of him. The tail, coiled over itself like a snake in a fishbowl, punched a hole through the opposite wall, spilling off into the dining room and thumping noisily into one of the chairs. A distant crash.

He shuddered with pleasure as he spilled fee, bursting out in every direction. As the first few walls broke apart, the support beams came crashing down with it, and he slowly slid down to all fours as the room gave out its support structure around him. Plaster rained harmlessly upon his stretching muzzle, the last remnants of humanity winking out as the brown of his eyes drifted into a heterochromatic blue-and-gold; for as much as one could see, anyway, as they slid back into his head in blissful release.

Huge.

He was beyond enormous.

It took a minute to process he was done. Keys somehow – what and how he did things still confused him – was next to him, still, dust-free as though the room in his house hadn’t just collapsed in a tidal wave of fishy growth. He was all smiles, grinning as if Jordie hadn’t just destroyed probably six figures in housing environment.

Knowing him, he probably had some crazy magical ability to put it all back together.

“Well, I’d say that went rather well.” Keys seemed almost as ebullient as him. He laid a hand upon a thigh, inspecting his handiwork before tracing along the curve of his knee and back over – he had to stretch just to reach the base of the tail, as thick as the small luminari’s torso – just to stroke along some of the tail length. Despite his gargantuan size, Jordie found himself shuddering at the touch. Some part of his brain wondered if he could keep going. The thought of Keys making the decision for him deepened the crimson in his cheeks towards somewhat near-purple.

“Amenable, pliant, the kind of magic that makes all this all the easier.” He hummed to himself. “How’s it feel?”

“Um.” Amazing? Incredible? He was sorry he had to stop? He was kinda sorry about breaking the whole room in the first place? “Pretty good?”

“Having trouble with the words for it?”

“Yyyyess. Yes. Great. Amazing.” He turned over, rolling back and grunting, biting back a groan as he found his backside laying upon dozens of feet of coil. He took in the flippers; each larger than Keys, with webbing spread far enough apart that he could have bridged most of the gap of a car lane. A flex of toes, curling them in deep enough that they nearly could reach his soles.

It took much to keep from drooling at the sight.

It was a minute before he noticed Keys clearing his throat. Trying to get his attention. “Um?”

“I thought you might have an idea as to what you wanted to do next.”

The crimson rose in his cheeks. More? Or if you wanted to show your own kind of shapeshifting – you can shapeshift, right? – no no no we’re trying to be normal here. As normal as…as this can be.

“…Are you gonna need help with the, um. All this?”

Keys barked a laugh at the thought. “Yeah, that’s its own process. Don’t worry about it.”

He considered another moment, then blinked, grinning slow.

“…you got any water parks in the area?”