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All was quiet in the lair, just how Master Splinter liked it. Peace was his greatest ally with his rambunctious sons trying to save the city from a whole assortment of colourful villains night after night. It gave him time to meditate and think to himself, clearing his mind to focus only on what he deemed to be important. Very little could break him out of his routine once he set himself in it.

One of the only things that could, however, was hunger, as his growling stomach was tough to ignore. With much chagrin, he pushed himself to his feet, trying his best to disregard his natural bodily noises despite how loud they could be.

The serenity was appreciated as he padded over to the kitchen, his spacious maroon robe flowing over his lanky frame. Perhaps it had been too long since he last ate. He usually sat down with his sons to eat breakfast, but that'd been hours ago by then. It made him realize that he needed to keep better track of the time.

And then there was the matter of what to eat. His normal diet consisted of anything that the turtles didn't care for, which worked out for him considering how little he desired consuming what they ate. He found pizza far too greasy for his liking in spite of the large cheese content. Humming, he opened the door to the fridge to see what-

A strange liquid flung itself at him the instant that he opened the door, drenching him as the glass container that held it clattered to the ground, miraculously intact. His mood had soured immediately. Food could wait, he had to clean up first.

Little did Splinter realize that the mysterious fluid was one of Donatello's recent experiments.

The turtle had been gifted an incredible intellect and a knack for inventing all sorts of things that improved the quality of life of everyone in the lair. It was too bad then that an oversight in his latest undertaking potentially jeopardized both the results that he'd been looking for as well as his sensei. It made sense to him at the time, though - the reaction needed to be refrigerated in order to remain stable, so why not keep it in the refrigerator?

It turned out to be a terrible idea thanks to the turtle's uncharacteristic absent-mindedness. The way that the flask leaned against the door meant that it'd splash its contents onto whoever was the next to open it. The sticky note explaining the possible dangers inherent with any and all contact had flown behind the jar of pickles with the sudden change in air pressure, well out of the way of the vial. It wasn't just Splinter being oblivious - no one would've seen it if they didn't know to look for it.

Regardless of not seeing the note, Splinter knew right away who the culprit of the unexpected mess was. He grumbled to himself as he tried to wash his hands as best as he could, though understood that accidents happen and that it wasn't healthy to harbour any ill feelings towards his son.

Maybe his tune would change if he knew what the experiment was supposed to be.

Donnie had been toying with the concept of matter duplication through a number of different means, ultimately settling on a liquid solution as that'd produced the only result in the numerous attempts that he'd made. It worked well on the one thing that he'd tried it out on - a pebble on the floor of his lab - but he'd not applied it to anything else.

Which meant that there wasn't any telling what would happen to organic material, not that he'd thought that he was even close to trying it out.

Once content with how clean he'd gotten, Splinter grabbed a granola bar to munch on so that he wouldn't incur the wrath of the fridge again. He needed to get back to his meditating anyway.

Time seemed to slow to a crawl the deeper that he fell into a peaceful trance. His thoughts flowed like water, harmonious with one another as any fears and doubts moved out of his conscious mind. It was times like this that he relished most, with nothing around to-

He grunted, breaking his daze as his mind came crashing back down to reality. Something felt wrong, like he'd just become uncomfortable in the short while that he'd been sitting down. He'd thought that he'd have noticed at the beginning, but he couldn't recall anything wrong. Maybe he just needed to ignore it.

Centring his breathing, Splinter resumed his meditation, hoping to ease back into the calming state that he'd bounced out of. All appeared to be going well, his breathing returning to its slowed rate, tempering his heart beat.

And then the discomfort got worse.

It was official, he couldn't ignore it any longer. His face contorted in annoyance as he pushed himself to his feet, upset that something else had gone wrong that day. He needed to see what the matter was. In one swift motion, he tugged the drawstring to his robe and-

Gasped when he saw how ripped his body had gotten. He'd been toned throughout his life thanks to years of diligent practice in the art of ninjutsu, but not like this! His brain almost couldn't process what his eyes were telling him. He looked like a calendar pinup! No, he was bigger.

And still Splinter's body didn't cease its growth. The barrel chest that he'd never had before in his life swelled before his very eyes, as did the rest of him. He couldn't see much because of his robe, but he could certainly feel everything that was happening to him, including how his arms began making his sleeves feel rather snug.

It was a good thing that he'd opened his robe as his torso had begun widening to make room for more beef to pile onto his formerly lithe frame. His midsection tightened into a wall of bricks, abs firm to the touch like he'd never had before. He could even feel the way that his growing back pushed at the fabric of his garment despite it being free. What was happening to him!

His eyes bulged wide when he remembered the event from earlier and how he got soaked in the strange solution. Was that what caused this? It couldn't have been the granola bar, unless there was a recall on it that he was unaware of.

Splinter's growth hadn't abated in the slightest, instead ramping up the more that time passed. His pectorals bloated into view for the first time, startling him that he could see them without needing a reflective surface. It was the perfect timing to obscure his burgeoning quads, the muscle groups blimping up like party balloons.

But his attention was elsewhere as his robe continued to tighten, though he'd become far too stunned by the abrupt changes to do anything about it. He could only watch as his swollen arms persisted in their expansion, busting out of the sleeves with unruly bulk that bulged with every movement. He was aghast with the size of his limbs, his triceps alone seemed bigger than his son's arms!

And then there was his back - the only thing still challenging the fabric of his garment. It broadened out profusely as densely-packed heft crammed itself under his pelt, forcing it to grow hilly with impossible muscle mass. The combination of expanding in every direction caused the robs to shred to pieces in a matter of moments, rendering it unwearable, especially on his ever-swelling frame!

The sudden feeling of nakedness terrified Splinter at first before he forced himself to relax and take stock of the situation. He'd felt like this when he'd initially mutated, so it wasn't like he didn't know what to do.

But still, this was unheard of. Nobody grows in a matter of seconds, let alone getting this aggressively muscular. It was surreal to witness the flourishing of his body in real-time. He couldn't think of anything else but to see if he was dreaming.

A tentative touch indicated that, no, this was all very real, and all very him. He sucked air in through gritted teeth as his hand recoiled, not anticipating just how pleasurable it was to caress his growing enormity. As much as he was embarrassed to admit it, the sensation of groping such a colossal pectoral turned him on big time.

Still, Splinter wasn't content with only what he could see for himself, he wanted help to view the rest of him. He ambled over to the washroom to observe himself in the mirror, needing a second to adjust to his now-weighty gait.

What stared back at him was shocking not only because of the magnitude of his changes, but also the fact that they were still going. He had trouble trying to keep himself in the frame thanks to how much his torso persisted in its growth.

His cock had throbbed to life as a result of his earlier fondling, though he couldn't believe just how gigantic it'd grown. What was an average-sized phallus had positively exploded past any realms of reality to become something significantly more masculine, pulsating with the need to release his load. Truth be told, he hadn't let himself have any fun in quite some time.

And yet, Splinter's body still wasn't done. His already gargantuan frame continued its ascension into grotesque territory, well beyond his robe's capability. Hot from exertion, his body pulsed in sync with his heart beat, veins snaking along his limbs the more that his bulk blossomed. It was all so much to handle, yet he found himself enjoying it thoroughly.

Craning his neck to his side, he watched his arm gradually enlarge, though it couldn't compare to when he flexed it. His jaw nearly fell to the floor when his bicep tensed into split-peaks, bunching up twice as big as where it started, though he noticed that even when flexed it was still growing. Just how much more of this was going to happen?!

Splinter couldn't be sure, but he was certain that he'd seen people at this size before on television and magazines. These kinds of heavyweight bodybuilders seemed like something made for entertainment media, and yet here he was with the exact same build. The one difference with him was that he wasn't done growing yet.

Already massive, his chest expanded even more, swallowing up more of his field of view until his entire peripheral vision was nothing but his brown-furred bulk. His shoulders, too, swelled in time, those cannonballs accentuating the titanic traps that rose to his ears. He huffed from the sensation, his face growing flush from how much he was liking it.

Arms that put steel cables to shame surged with beef, engorging themselves with muscle mass to put even the biggest men on the planet to shame. He couldn't stop himself from relishing in how they fought with his billowing lats, those wings flaring out wider than doorways could handle. It only occurred to him then that he might have some trouble getting out of the restroom.

Well-hidden by the rest of his immensity, his legs were also getting in on the action. Over the course of seconds his quads doubled, tripled, then quadrupled in size, bursting with muscle to the point that he'd crush anything that happened to get in between them. He almost wished that something would.

At this point it'd be impossible for him to see in any fathomable way, but his ass also ballooned in mass to keep up with the rest of him. Flourishing mass beefed up his cheeks into dimpled glutes more befitting of the behemoth that he'd become, making him wonder if he'd be able to even use the couch now. He could easily find out, but he didn't want to be rude to his sons.

Not to be outdone, Splinter's prodigious shaft followed suit with the rest of his gorgeous physique, thickening wide as veins crept along his cockflesh like roads on a map. He groaned in delight as he felt the head of his dick shove up under his humongous pec shelf, nestling in further as it continued swelling.

His balls, too, fattened from the growth, bloating out past his knees with hot, virile ratbatter, waiting to unleash it. The sensation was electric, his nerves fraying from the intense pleasure rocketing through him. He'd never felt quite so heavy before in his life and he loved it!

And still he kept growing. Inches added to his measurements as he took on hundreds of pounds of delicious beef in a matter of moments. His mind was so awash with his new enormity that he struggled remembering what he used to look like for a point of comparison. All his brain could do was take in everything that was laid out in front of him, all senses activated.

Splinter's expansive chest had billowed out so much that his muzzle was scant centimetres from their mammothian heft, allowing him the ability to bury his snout in his pec valley. He basked in his vastness, nostrils flared out in order to huff his heady, masculine scent while his tongue lashed at his dense, sweat-matted fur to try and coax more out. No matter how much he managed to release, it wasn't enough.

His body flexed on its own as pleasure coursed through his veins, tensing bigger than any bodybuilder could ever hope to achieve. He'd grown so swollen with hypermasculine beef that his mind had solely focused on it, wanting to push himself as far as he could feasibly go. Considering that he'd not gained a single inch in height, he might not have much more growth left in him.

But that didn't matter, he was far too horny to care about what would happen to him after. More and more he whuffed his intoxicating scent, unconcerned with how unsightly it was for the ninja master to be partaking in such a lewd display. He'd grown far too engrossed to stop now.

His arousal came to a fever pitch as his orbs audibly gurgled with need before pulling up to his crotch, letting loose everything that they'd produced thus far. He moaned low and loud as his cumpipe bulged out between his pecs, blasting his muzzle with rich, creamy spunk that only made him love himself that much more. He took in everything that he could, never quite reaching his cock with his mouth, though what little his tongue contacted sent shockwaves of ecstasy rippling through his tremendous form. That was an orgasm for the ages!

Splinter was beside himself in euphoric bliss, reveling in his explosive climax. Never before had the thought of cultivating mass like this crossed his mind, but now he didn't know what he'd do without it. Sure, he'd have to think of how best to adjust to being a rodent colossus, but a ninjutsu master like him was more than capable of the task.

Now he just needed to think of how to incorporate his inconceivable mass into his training.