Humantaur Phen
by Phen

She had passed the point of no return.

Phen stepped back from her chaotic lab-bench and took a deep breath. Lightning flashed appropriately across the night sky outside and cast long, ominous shadows through the sprawling research complex. Only one laboratory remained lit, as the cooperation's most brilliant - or at least the most bold - investigator experimented on herself.

It was not the first time that she had subjected her body to her newly synthesized samples, and she saw no reason to stop. She was a tallish woman, with hair the color of burning flame reaching down to the small of her back, and a pretty face twisted into the expression of manic passion that only a mad scientist could pull off. Her emerald eyes practically shone with fervor for her craft, and even her nickname 'Phen' had come from the world of chemistry.

She wore nothing but a white lab coat, stained with a dozen different colors, and a pair of slippers. Her biochemically enhanced body certainly deserved it, though there were no one else in the lab to appreciate her streak of exhibitionism. Huge, shapely tits ornamented her chest and made buttoning the labcoat a pain - so she didn't. Pink areolas the size of tea cups showed past the edge of her coat and her fat nipples made thick bulges in the white fabric. Further down, her hips widened into a sexy ass that was every bit as calculated as her bust.

The fat girlcock that hung between her thighs and hid her feminine sex from view was easily the most eye-catching of her features. Veering past the boundaries of her gender, she had experimented with both and liked the result enough to keep it. In addition, she was far more endowed than any man she had known, her enormous, feminine shaft swaying between her knees, and her heavy, hairless balls hung almost as low.

A simple necklace hung from her neck, adorned with a delicate red feather that all but disappeared in her deep cleavage. Her coat pockets were stuffed with pens and access cards, and in her hands she held the empty vial.

"I'm ready," she whispered and threw the vial down upon her bench as a powerful shudder went through her body, the prelude to her transformation. She took a deep breath, her poorly covered breasts threatening to spill out further. The familiar tingle that ran down her spine felt comforting, like an old friend.

The tingle spread through her synapses and throughout her whole body. Her nipples grew erect in its passing, and finally the tingle solidified in her lower limbs. A mix of sensations gripped her - Phen felt at once so bubbly and light that she could drift off into the sky, and at the same time the muscles in her legs cramped as if she had been cooped up in an airplane all night.

She chewed at her lower lip. "I'm ready." A nervous smile fluttered at the edge of her mouth as she repeated her mantra and drew herself up to release the building tension in her legs.

Phen took a step forward.

A kaleidoscope of sensations hit her brain, nonexistent colors bleeding into her vision as her mind adapted. She had taken a step, but an after-image of her lower body remained behind in their previous position. No mere image, the legs were flesh and blood, but the limbs had a formless quality about them, like a still of a painting caught the process of creation. The skin flowed, connecting the second pair of hips to Phen's backside in a seamless projection of her body. The segment between her four legs were another torso, as evidenced by the navel that manifested itself along the underside. She body had become that of a centaur, except all human - exchanging horse for smooth, silky skin and a sinful abundance of curves.

Phen gasped and gawked at herself. Every little movement made her shiver and the mere touch of her lab coat upon the virgin skin of her taur-back almost felt painful. "It worked!" she breathed raggedly and grinned like a loon. "I'm a fucking genius!"

Her shape continued to flow - her limbs grew long and slender, yet stronger than ever, as the bridge between her two sets of legs lengthened. The real jackpot had yet to show, however. The cock between her backmost legs, already oversized, began to swell. With arousal, to be sure, but it did not grow erect - it merely grew bigger, fattening immensely as the thick head dangled down between her shins. Phen's girldick stopped mere inches above the floor, which left a single drop of cum swinging from the crown of wrinkled foreskin to make contact with her left slipper.

She pushed her hands together and gripped until her knuckles turned white. Don't touch yourself yet, she intoned, just let it run its course. Then... Then we'll see... Her body had other plans. Her cheeks had grown flushed and her dual endowments ached for attention. She bit down, determined not to violate the sanctity of her experiment.

The storm of pleasurable sensations that wracked her body did not have any such restrains. The massive cock between her back legs, fully enough to shame the biggest stallion, widened immensely as it leaked cum into an equally impressive puddle on the floor. The ache of cramping muscles returned to her loins, building up tension until Phen felt like screaming for release. The tension hit a high point and finally, oh, finally released, into a second stage of her transformation. Her massive cock split down the middle, separating into two identical shafts with all the beauty and simplicity of multiplying cells. Her balls split likewise, two smooth sacs brimming with the virility of her beach ball-sized testicles. They weren't just for show - the amount of cum that splattered out across the room from all three of her cocks was nothing less than staggering, and it continued as the lower side of her taur-half was decorated with breasts of its own. Two sets, of course - and roughly twice the size of her regular, head-turning bust. Both pairs got in on the festivities as they expanded, her huge, pink teats erupting with regular showers of milk as they filled out with a tantalizing cleavage in the shape a four-leaf clover.

It was too much to bear. Phen moaned out loud, filling the spacious lab with her quivering voice as her cum filled the floor. Her knees, both sets, felt like jelly - but at the same time she became cognizant of the wonderful lightness of her limbs. Despite the massive weights materializing in her transformation, her body was light and nimble as a gymnasts. She smiled, then, tracing a finger along her breast. "Oh well. Might as well see what I've gotten myself into this time," she said and squeezed her cock.

Phen took a step forward and plunged herself into a renewed sensual chaos.

Another after-image materialized, another set of legs and torso adding to her existing two. The third segment blended as seamlessly into her second as before, and her limbs grew ever more sensual and light. With the fireworks between her legs, the widening of her hips seemed almost subtle, but in the whirlwind of emotion she found time to take pleasure in the simple, erotic swelling of ass and thighs.

It could not last, however. Phen shuddered involuntarily as her third loins bloomed. She craned her neck to see, to let her eyes participate in the feast of her body as it outgrew the constraints of sensuality, biology and sheer euclidian geometry.

There was a cock between her legs. A very sensitive one. Phen felt the higher functions of her frontal cortex unravel as her burgeoning girlcock swelled, expanded, grew - from merely big to inhuman, from inhuman to elephantine, from elephantine to - sweet heaven, how big am I going to get?

The shaft that hung between her plump, backmost thighs was beyond the mere worry of dragging on the floor. Rather, the question became 'Is my cock bigger than a normal human being?' Close to 5 feet long, it certainly felt heavy enough - and at the same time, seemed to weigh nothing at all. But it was big, and it pushed up against the back of her second pair of legs as she squirmed with primal pleasure.

In a way, Phen knew what had to come next. She simultaneously hoped and feared for it, but cried out in happiness all the same.

Her cock split in elegantly into four shafts, quadrupling the sexual power between her legs - and the weight! - in the blink of an eye. Her balls followed suit, the mighty orbs each big enough to touch the floor and bunching up in an disorganized pile as two became eight.

The subsequent blooming of tits along Phen's bare underside plunged her firmly into the side of impossible geometry. Small, shapely breasts became hand-filling hooters, which retained their enviable shape as they overflowed and grew past the size of her own head, past the size of any fruit or vegetable that you'd care to mention and settled for a size big enough for her dinner-plate nipples to settle heavily on the floor below and gush milk like broken water pipes! She sported a row of four pairs on the space of her third segment. Four - and while her connecting torsos were clearly longer and more flexible than her normal version, even two sets of those massive funbags would have been pushing it.

And yet they fit.

Phen couldn't stop smiling, even as her rapidly growing junk shoved against her lab bench and scattered plastic tips and carefully arranged solutions in every direction. She embraced her increasingly sexual nature and began to masturbate in earnest, while craning her neck to admire herself.

Her body responded eagerly, cocks firing again and again as her breasts doused her surroundings in milk. The laboratory was a big, airy affair, and yet her collected juices filled the floor up to her ankles already and rose steadily as she made love to herself.

The swirl of lust inside her head stepped up a notch as yet another stage of her ascension to an elemental of sex hit. Her pussy had contributed greatly to the mess around her, and the jolts of pleasure made her knees buckle as new slits flowered between her new sets of legs. Two and four, they mirrored the multiplicity of her male endowments in number... And in size as well, swelling up bigger, deeper, wetter. Huge, round clits engorged and just about drove Phen mad as they bumped and ground against her wonderland of curves. She squirted like a whole group of firefighters, coating her body as well as ceiling and walls in wild sprays of fragrant pussy juice.

Her mind blank, Phen sank to her knees - in her first segment, at least, where the size of her cocks and breasts didn't hold up her body. She jerked and fingered herself like a woman possessed, while the hormones and nerve signals inside her fired in a continual orgasm. Her fingers could hardly close around her fat, front-most cock, and her nipples set her on fire every time her frenzied arms grazed them. Every erogenous zone on her body went up to eleven, and her multiplied body only magnified the sensations.

As Phen collapsed and arched her spine, her transformation continued. A fourth segment pushed forth from her fertile hips, forming amidst the unstoppable waterworks that was her orgasm. A fourth set of long, sexy legs, and a groin promising to be the most heavily loaded yet.

"Fuck..." Phen moaned hoarsely, "Need to fuck..." She felt new crop of cocks grow fat and hard and decided through her haze of lust to act on it. It took a lot of squirming and flexing of her unfamiliar taur-back, but she managed to grasp one of her new cocks with her foot as it grew and guided it up to her waiting cluster of cunts.

The shaft was massive, a totem pole that she could not even hope to get her arms around, and it all went deep, deep into her sex. The mix of throbbing and pulses of expansion made her toes curl, but the copious amounts of ever-spurting cum made the entry smooth and easy. There really was no way for anyone human to take a shaft of that size, and even her body was too petite for the beast to fit - but it did, and her pussy was hungry for more as it rippled around her dick.

"Fuck!" Phen cried. No more words came, though the rest of her did, and did so copiously. She stared ahead and fought to get more dick inside herself, to spear her aching cunts with her likewise greedy cocks. Her legs moved clumsily amidst the eight gargantuan shafts at her fourth set of legs, but the flesh was more than willing.

One after another, Phen's monstrous girlcocks slid into herself in a wonderful display of self-love. She did not have enough holes, so she delved into double-penetration in her quest to sate herself and stretched her gushing pussies out wide while torturing her clits with the friction of seven simultaneous couplings. The deserted laboratory filled with the sounds of lovemaking, a cataphony of flesh striking flesh, of cocks and cunts uniting amidst endless showers of cum and the sloshing of her fat, swaying balls.

The level of fluid became too much to contain. It rose past her knees, past the level of the tables across the room and finally big enough to coat the lower part of the windows - until the glass gave out from pressure and the pungent mix of semen, milk and pussy-juice squirted out into the night like a waterfall of her own.

Phen kneaded her tits, sucking and drinking from her fat, pink nipple as her sets of hips gyrated like the motion of the sea. One segment fucked the next, filling her bottomless holes with a veritable lake of love. She humped, she sweated, she came. Time ceased to exist.

The room was erased by the flood of cum. Despite the open windows, it still rose and took everything that was not bolted down with it. The gang-bang on legs was buoyed up by her squirting endowments, but the bundle of pens and knick knacks in her pockets were not so lucky. She remained there, the eye of the storm...

Clarity dawned on her in flash. Phen closed her eyes and opened them again, too see the world of frothing, white fluid around her. She smiled. With all the calm of a zen master, she rose to her feet once more and padded out into the center of the room. Her gushing slowed to a trickle and one by one, she unsheathed her cocks from their pulsing scabbards. Thus situated, she walked her long body into a half circle and turned to her back end and the bundle of fat, floor-dragging balls that lay there.

A fifth segment grew out, a new pair of ever widening hips and plump thighs that flexed as they touched down upon the heap of balls. No hydra of sexes developed between those lovely legs, however. Instead, her sixth pair of legs and hips appeared, along with her eighth, ninth, tenth. Phen's train of legs went over her gargantuan ballsac for lack of space as it lengthened.

Phen giggled under her breath at the absurd sight of her bottom bumping against the door to the lab and extending out into the hallway. She was walking backwards, in a sense, although the rest of her stayed still. Her movements became more graceful by the second, going from tripping over her own legs to dancing backwards like a ballerina.

The centipede-like progression continued out of sight, threading its way through the labs and auditoriums in a complex pattern. It gave time for the room to empty of fluids, a good deal of it spilling out into the open hallway, though the intense scent of the sex of a goddess stayed around.

She traced a finger down the base of her fat, feminine cock, through several layers of cum and milk. "Now," she whispered, and watched her form intensely.

The flesh obeyed. A lone shaft sprouted from her fifth set of legs and slapped to her knees with a meaty sound as it grew. Longer and longer, it raced down her mound of flesh, past her toes before it rose with blood and arousal to impact along the set in front of it. As before, its final dimensions were more than twice of its predecessor, which lead to a manhood as long as a container, a massive spire of fuck-flesh that quivered and throbbed with sexual power. Her balls fallowed suit, the pair of churning orbs filling with a downright dangerous amount of cum as they rose to the size of boulders.

Phen grinned.

The girlcock erupting from her sixth set of legs caught up in an instant, swelling with naked eagerness and disgorging a stream of cum as it hit the previous fleshy redwood on the way. Twice the size, it was bigger than a bus and much more reliable at cumming when needed!

The next one shot out like a train, punching through the wall as if it was made of paper and bringing the fountain of jizz out into the open. Then the rod from her eight's pair of legs emerged and took out the ceiling lights by its girth alone. Already Phen was becoming something more than just a sexual creature, as her body expanded to sizes and numbers unthought of.

The pleasure was unbearable, but Phen just smiled. One by one, she let her cocks disgorge from her waiting crotches, lifting her long train of legs into the air as endowments that could flatten a country emerged. "Beware the power of exponential growth," she chuckled and raised her hand to stroke a cock the size of a cruise ship as it slid past. Ungodly virile balls rose towards the sky, demolishing the research complex without as much as a thought.

She was past the point of no return. Her body kept lengthening, and one by one, she let out her ever-larger girlcocks. The unceasing doubling in size lead to shafts the size of skyscrapers and beyond, dicks and balls big enough to smother entire cities, spanning for miles upon miles and piercing the sky above.

"The dawn of a new era," Phen grinned. "Or at least, a really hot night out." She rubbed her swollen nipple and ran her tongue across her lips as she lit the fireworks.

Her cocks began to multiply. 16 horny lengths for her fifth segment, 32 for the next. The change rippled down her body with an earsplitting noise of growing, stretching skin, and in the blink of an eye her eternal orgasm started anew. Clusters of balls, numbering in the hundreds, churned and sloshed as if they contained the ocean itself - and perhaps they did. Every inch of her fair skin became drenched once more, generously helped by her blossoming pussies and their flooding wetness. At this point, she could have set the whole research complex under water by fingering and squirting from the single cunt between her front legs - and as ever, the magnitude of her sexuality multiplied uncontrollably as it ran down her hundreds of legs. And, of course, her bosoms returned to smother absolutely everything in soft, pliant flesh, in fountains of milk that ran and gushed from her mountainous nipples.

Phen looked up at the landscape of flesh that formed around her and the rivers of cum that poured through her fertile land. She rubbed her chin thoughtfully and muttered to herself. "I wonder if I can find my workbench again..." A wide smile appeared on her face. "I just had a fantastic idea for a new serum!"