Mutagenic Madness [PTRN][RWD]

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#21 of Patreon Stories

October reward story for Erian Zoutman!

A flood of mutagen ambushes Splinter and his sons while in their lair, imbuing them with size well beyond what the sewers can hold, and in some cases the universe itself~

2476 wordsORIGINAL POST


Life in the sewers was quiet, just how it ought to be. It rarely ever was with Splinter and his boys having to defend the city above them from various parties looking to destroy it, but they did so with a self-assuredness that could only come from years of doing it. It made things peaceful.

They continued to train in their lair to keep their skills as honed as possible, never sure when something unexpected could rear its ugly head. It was fortuitous that they did so to combat most enemies, but there was one that none of them could have prepared for.

A mutagenic flood rushed through the sewers, catching all five of them in its path. Unstable in nature, the ooze made quick work of their genetic material, mutating them further than they already had been. They wouldn't turn into anything else - instead the glowing goop saw fit to affect them in other ways.

The mutagen worked its magic instantaneously. In seconds they all began to grow, busting through the ground like tissue paper as their forms burgeoned. None of them had a chance to react until it happened.

Feeling the open air of the city when he was just underground mere moments ago felt surreal to Master Splinter, whose heart beat out of his chest as he suddenly found himself on the surface. He couldn't explain what happened as it'd occurred far too quickly for his mind to fully process.

His senses were assaulted with various sights and sounds that overwhelmed him from transpiring all at once. Time felt like a blur. It took him a few seconds to reset his brain to better understand his state of being, needing to rub his eyes as well. The abrupt change in his environment begged the question - if he was suddenly above ground, then what happened to New York City?

The brown-furred rat quickly discovered the answer when he regained his bearings - he was smothering the city under his bulk. His nostrils flared when he saw his body become the size of the city in what felt like a blink of an eye. Skyscrapers that towered over him before now looked like children's toys in comparison.

He supported himself by leaning onto Staten Island, in shock that the rest of him stretched from Brooklyn to the Bronx; he hadn't even noticed that his musky balls smothered Queens. Words failed to leave his mouth as he surveyed his inexplicable expansion.

If that wasn't enough, Splinter only then realized that he'd grown in more ways than one. While he'd always been fit as a master of ninjutsu, he'd never been quite this defined before. Thick beef rippled down his torso as he inspected himself, giving him the appearance of the bodybuilders that he'd only seen in various forms of entertainment. Never before would he have thought that he'd look the same way; he never intended to be so heavy!

It felt very strange to him that the mutagen affected him in this way, in both size and muscularity. Why didn't it do that when he initially transformed? Was this somehow a different solution than what he'd dealt with before? How did his sons fare?

And that's when something struck him as odd - where were his sons? They were with him when the lair got flooded. Were they still in the city? Surely at his incredible size he'd have noticed them by now.

And then he saw it. Out in space was something other than the stars, nearby the planet and green as grass.

In the unfeeling void of the cosmos was Raphael, unaware that the Earth was in between the two toes on one of his feet. He, too, had been stunned by his rapid ascension beyond the scope of the planet, having never thought that he'd ever be out in space at any point in his life.

What shocked him even more was the fact that he had no issues breathing. That wasn't to say that there was much that he could breathe out there, but it meant that he was alive. Somehow.

Unlike the others, he maintained a level of fitness that neither his brothers nor his sensei particularly tried to match. His love for exercise had him regularly working out, maintaining a muscular physique as a result of all his hard work. And while he was never about to equal the likes of people who pretty much spent their whole lives in a gym, the amount of effort that he put in was nothing short of impressive. It was something that he could be proud of.

And yet, being blasted by that rogue wave of ooze pushed his body beyond what he thought that he could achieve. His defined muscles that he kept as lean as possible were now well above-average. He'd become shredded as all hell, with a chest that puffed out with rock-hard muscle whenever he brought his arms close to his sides. That was when he noticed that his shell had disappeared - it must not have grown along with the rest of him. Weird.

Huh, he was actually kinda liking this! His arms seemed to have doubled in size as his triceps dominated the limbs with their bulky horseshoe shape. Abs that he could at least trace with a finger before now popped out like brickwork. Already large before, his legs looked competition ready with how thick with beef they'd become, flexing even huger as he tensed them. They perfectly framed his turgid turtlehood, complete with heavy testicles positively begging to be emptied.

But none of that became of a concern to Raph when he realized that he was alone. Where was everyone?! He looked among the planets that orbited around his galactic mass, yet he sadly didn't see anything. Did they all survive the flood too? They had to have; his family was as tough as he was.

Still would be nice to know where they were, though.

Were he aware of it, he'd have noticed the enormous green mass directly behind him, which, in actuality, was his brother's balls. Leonardo barely had any idea of what had happened before he suddenly found himself spanning to the farthest reaches of the universe. His recollection of the event was hazy at best - one moment he was with the others, and then he was here in a matter of moments. But how?

He'd been in the middle of the pack as the mutagen slammed into the five of them, though he remembered that he surprisingly hadn't been washed away in the flood. Everything had happened so quickly that he couldn't remember who was where when it hit them. He did remember feeling the growth happen, however.

Apparently that was something that he did a lot of considering how gigantic he'd grown to be. Entire galaxies swirled around him, black holes being pulled into his gravitational field as he existed in the empty vacuum of space. His size was unfathomable, and yet there was still more to him than he initially noticed.

A quick glance down revealed that a surprising amount of muscle mass had been piled onto his frame, well past what he normally kept himself at. The way that his newfound bulk bulged with every errant movement had him mesmerized, especially when he happened to pull some other celestial body towards him. If he didn't know any better he might say that he got as big as Raph, though he knew for a fact that his brother was a far cry from waltzing onstage and posing.

Poking his chest led Leonardo to understand that his eyes weren't deceiving him and that he was, in fact, relatively muscular in size, moreso than when he woke up that day. It was strange to see biceps that swelled up into what looked like baseballs to him, the different muscles on his arms plainly visible thanks to how developed they'd gotten.

Looking around the universe was a genuine treat to behold. Stars of all sizes and brightnesses illuminated what would have otherwise been total darkness, even though they looked like specks of dust to him. These were sights that he'd only be able to see on the internet. If only his family could witness all of this.

One thing that he couldn't understand was where the rest of them were. He knew for a fact that they were caught in the same mess that he was, yet he barely registered their whereabouts after it happened. Hmm, he'd definitely be able to see them if they were also universe-sized - there literally wouldn't be any room for him if they were - which meant that they must have been affected in different ways. Could they be smaller than them? Could they be bigger? Wait, was that even possible? What realm of existence lay past the universe?

The universe that he overwhelmed with his bulk wasn't the biggest thing around as it had neatly nestled between Donatello's pecs. In spite of being the smartest of the bunch, he couldn't comprehend the impossible events that led him to be viewing multiple universes at once. Realities of all shapes and sizes whirled around him, allowing him the ability to peer into as many as he wanted to.

It fascinated him that something like this was even possible. This theory - of all theories - happened to be correct! It was the scientific discovery of a lifetime, and he had no way of communicating his findings to anyone. The realization would have maddened him had he not been so engaged in analyzing the sights before him.

Every universe seemed to be contained in a bubble of some spatial material unknown to humanity, but why would they ever have known that this existed when they couldn't traverse the bounds of even the galaxy? Hmm, which one was the one that he came from?

Had he looked anywhere other than directly in front of him, he might have noticed that he was now sporting quite a bit more heft than he normally did. As he was the scientist out of the four of them he never really kept up much of a fitness regimen in order to hone his body. It kept him pretty lithe in comparison with his brothers who trained a lot harder than he did in that regard.

But that was all in the past as he now possessed a body worthy of admiration, jacked like those who worked out for a living. Since his shell didn't grow along with him, it gave his back a chance to shine, displaying sumptuous musculature like an expert sculptor had chiseled out of a large block of marble. He was truly a sight to behold in his own right.

While aesthetically pleasing, his bulk likely wasn't something he'd paid all that much attention to when he finally did notice it. Arms that stretched out to hold dozens of ever-expanding universes looked like he'd been training them for years with how much they tensed when moved. He'd never even realized that the one reality that used to house him was getting lost amongst the others that he'd collected.

As daunting a task it was, Donnie was sure that he'd find his brothers eventually. It might take him a few eternities to accomplish the task given how many universes there actually ended up being, but he was certain that it'd happen at some point. The question was, of course, when.

He'd become so caught up in studying his environment that he failed to notice just how masculine it all smelled. That was because he'd been situated at the base of Michelangelo's crotch - by his musky pubic brush - who absorbed the brunt of the cascading ooze and had since grown bigger than existence. His ascension was the most magnificent out of any member of his family and he knew that none of them could even fathom just how mighty he'd gotten.

The amount of energy cascading around him from all realities felt incredible. The kind of forces at play from the various multiverses that housed all living beings couldn't even faze him as they'd been rendered insignificant to a turtle of his magnitude.

And he wasn't just thinking that either. As part of his breakneck expansion, his body had beefed up like he'd decided to pivot his life into becoming a gym rat, pushing himself as far as his limits would take him. Had he done that it would have clearly paid off as his bulk had swelled to the point that he would give professional bodybuilders a run for their money. Dude, this was awesome!

A giddy grin on his face, he got the feel for flexing his chest before bouncing each pectoral one at a time in rhythmic succession, watching each mound rise and fall after the other did the same. He could've done that forever - literally - but he had other things that he wanted to check out as well.

The rest of his torso was just as impressive in his mind. He couldn't see it, but he could feel how his back undulated when he moved his arms in various directions. His traps had grown noticeable as they began the process of swallowing his neck while his lats flared out to give him a wide wingspan. The feeling inundating him was simply out of this world and he couldn't get enough.

And that's when Mikey noticed how hard his self-inspection was making him. Oh man, he hadn't noticed that had gotten bigger too! Both his cock and balls were impressive specimens of turtle masculinity that would go unmatched with no competition around. Heh, he could actually jerk off right now and no one would tell him off. Not like he'd listen to them at this point anyway - he was at the top of the reality food chain now.

Wait, if he was currently the biggest thing in existence - even bigger than existence itself - did that mean that he'd become some kind of God now? Could he manipulate things as he pleased? The thought thrilled him to his core! But what would he even do first?

The thought to potentially make himself even bigger crossed his mind, but he wasn't completely sold on the idea as he'd at least wanted to explore his current physique just a little bit more. Wasn't this around the size that Raph usually was? It made him wonder if his brother got horny from his own body a lot or if that was something that he'd come up with just then.

Oh wait, that was a thought; maybe he'd get Splinter and his brothers to join him up here. Godhood sounded like it could get pretty lonely and he could sure use the company.

Right after he jerked off, of course. There was no way that he could ignore his urges now.