Vincent struggled to avoid boxes and hop fences as he tore through the alley, chased by the eldritch abomination behind him. “NINA, JUST GIVE ME CONTROL OF MY SIZE AGAIN ALREADY! I CAN FIX THIS!” he yelled into his earpiece. A feminine voice tutted on the other end, alone with the quiet tapping of a keyboard.

“Vince, are you sure? The suit is still in beta stage right now anyway,” the lapine reminded him.

“It’s either that or I get violated by this horrendous nightmare. So undo the size lock already!”

Miles away in their superhero lair, Nina grinned. “Okay, you asked for it.” A few weeks of development time had ironed out most of the minor issues still plaguing the rookie superhero’s suit. But the most impressive glitch, the one she’d discovered during its first test run, was still definitely in place. Which suited her just fine. Things were going to get very cramped for her squirrel.

---
The male squirrel tugged at the black and purple suit he wore. The spandex clung tightly to his body, accentuating each curve of his muscles. His finger traced gently down his abs and across his arm. The suit was brand new, completely untested, and fit like a glove. It didn’t look any different from the previous incarnations of his supersuit, but according to his assistant Nina this one had been supercharged. Whatever that meant.

“So Nina, why all the upgrades? The last suit was working just fine wasn’t it?”

The lapine tapped away at the tablet in her dainty hands. Vince could never tell what her fingers were always so busy with but when it came to his superhero duties she was constantly busy. Never a dull moment. “Don’t worry, I’ll show you what I mean. Easier than explaining it,” she replied. She pressed down on a big green button on the screen. Vince didn’t need to ask just what she’d done. He could just feel it.

A sensual throbbing flooded his crotch. He moaned and grabbed at his junk with a hand. It filled his palm but each throb forced it larger. Vincent’s eyes widened. Soon his balls were each the size of a baseball. So this is what Nina had been working on. Sure he’d been able to change the size of his, ahem, assets before but never this quickly. His sack felt warm and soft; it gurgled and swelled until even using both hands to hold it up wasn’t an option. The suit stretched easily to match his package though without missing a beat.

It didn’t take long at all before he looked like someone had shoved a pair of basketballs down his pants along with a half-hard shaft that snaked up past his abs. Only then did Nina press a red button on her tablet to stop the growth. Vincent could scarcely speak he was so surprised. It felt amazing and he was so incredibly turned on. But he still felt like he could move around as though nothing had changed. Sure it was awkward moving his legs around the mass. But it wasn’t like before, where he had to struggle with the weight. Running and jumping were still options.

“That was… s-strong. Urf. What power level did you press that time?” he asked. He didn’t so much care what Nina actually said to answer so much as he cared about keeping his mind away from continuing to rub at his shaft.

“That was just Level One. It goes up to Ten now.”

“T-Ten? Nina are you crazy?”

She giggled and placed a hand on the squirrel’s chest. Slowly she dragged her fingertips down along the obscenely stretched fabric keeping his penis in check. “You don’t have to pretend you don’t like it you know. I already know you do. And now with the new mythril nanofiber material your suit is lightweight, super strong, and can help you lift all that poundage you’ll pack down there. Easily.”

Sweating and swearing under his breath, Vincent wrapped his arms around his shaft. “D-Do we need to do more tests or is this enough? I thought you just wanted to… show me what you’d changed?”

“I dunno. It’s so cute seeing you flustered like that. Another level or five couldn’t be that bad,” she said with a grin and a wink.

Fibers of muscle mass started building onto his frame at breakneck pace. Vincent hulked out to bodybuilder size. He struck a pose, a double bicep flex. His muscles throbbed all across his arm, doubling in size. “This is insane,” he whispered.

Superheroes are definitely supposed to be buff but this had gotten ridiculous. Vincent couldn’t argue with Nina; it definitely felt good. This was larger than he’d been in a long time. Even when Nina teased him by sloooowly pushing his size to the limit it was never this easy to handle, or this large for that matter. It would often feel like thick balloons were attached to his suit but right now he felt just as nimble as ever. He blushed as the fabric stretched against his biceps. The suit strained and squeezed but never gave way to the furry mass underneath. The squirrel puffed his chest out and set his fists to his torso in a superheroic pose.

The thickening shaft, barely held in check under the suit, leaked pre on the cold fabric.  Vincent’s arms struggled to stay bent in the pose as his muscles fought for space. His usual V-shape body was slowly being replaced by a much wider, thicker size. Doorways would be his new nemesis now. Balls hanging down to his shins forced his stance wider and wider. The ‘level’ monitor on the tablet switched over to four. His tongue licked carefully along the salty tip of the shaft poking at his mouth, causing the supersized superhero to shudder.

As large as he’d gotten, Vincent was feeling greedy. He wanted more. And Nina was certainly enjoying the show. So he figured a little more showing off couldn’t hurt. The sparks of energy were starting to subside, the warming of his muscles slowing. And his cock was so thick he couldn’t help running his hands across it.

“Guess we won’t be testing the hard light capabilities. Something else hard that’s more important right now,” he remarked. Inside the suit his cock spurted and the pre nestled its way into the wiring. And when it did, the tablet screen froze. A pop-up error replaced the long list of variables and data from the suit.

Nina’s eyes widened as she tapped at the screen once. Vincent shrugged, still holding onto his shaft. Nina was smart, she’d figure out whatever had gone wrong. He watched as her insistent tapping slowly became more frantic. That wasn’t normal.

The suit shuddered suddenly with electric energy and Vincent found himself growing at breakneck speed. His body felt like it was on fire. The energy crackled and snapped with power across his chest and crotch. The floor touched its underside as it became half as long as his whole body. And his shaft draped over his shoulder. It wouldn’t stop. And when his growth there slowed down he found his muscles starting to expand to keep up.

“Ninaaaa, what’s going on!?” he said. His pecs expanded out to rub further against his penis. With a grunt and another shot of pre the suit was soaked all the way down its front. The scent of musk permeated the air as Vincent struggled with his lusty thoughts. The wiring was failing catastrophically now as his buffening increased ten fold. He’d never fit through a door again. The wall was looking paper thin and terribly fragile now. Leg muscles swelled against his balls, now thick as tree trunks. And each pulse of energy doubled them in size. His pecs and back muscles surrounded his head slowly. The suit, strong as it was, slowly started to pop and rip. Now the squirrel hero was just as wide a wall of muscle as he was tall and Vincent hadn’t grown in height at all.

Just when he thought he was safe though, that changed dramatically. His sigh of relief turned to a moan of pleasure as he began to loom over Nina. Inches at a time he puffed up toward the ceiling. His tail swished along the ground as it knocked over Nina’s tech and potions. And the floor beneath him shuttered with each small step he took to readjust his stance. The ceiling approached ever closer, touching the top of his fully erect shaft in only seconds.

Bending over soon became a requirement if he wanted to stay within the room. Every part of him bulged at once, from his crotch to his muscles. They throbbed intensely, pulling at the suit’s seams. And just when the suit felt primed to give up and shred, the warmth subsided suddenly. It felt like the worst blueballing of all time. His body was primed and ready to finish the job but there was suddenly no more stimulation. And so he grabbed hold tight and rubbed all the way up and down his front with both enormous arms, stroking a shaft he’d never be able to reach all the way around.

Vincent could vaguely hear Nina in the background… “The suit isn’t running anymore, just try to calm down!” she yelled. But he couldn’t care any less. The hormones in his mind had spoken, and they wanted more. His eyes closed as every fiber of his body tensed at once for the release. The mammoth cock between his pecs tensed too and his balls pulled up. A torrent of sticky, white cum bloated the tip of his suit and shot out all over the ceiling, floor, walls, everywhere.

The techie rabbit sighed as she hid behind a computer to avoid getting covered. This wasn’t what she had meant by a stress test.

---
Back in the present, Vincent rounded a corner onto the street just as the enormous octopus skidded across the road and slammed into a car. The superhero squirrel looked behind his shoulder for only a second to see what had happened. It scurried along on each of its appendages like some horrific anime monster, mouth open and hissing as it struggled to untangle itself from the metal and rubber.

A small ding rang in his ear and a hologram flashed in front of him, a sliding bar labeled POWER. The cartoon lock shape over the bar unlocked. “Okay big guy, you’re on. Show ‘em what you’ve got,” Nina said.

Colors lit up along the bar as Vincent dragged his finger in the air across it. 11 spots in all. “Nina, you put another level onto it again?” Vincent chuckled.

“I already had to work on the system’s stability, so why not? Don’t pretend you aren’t interested.”

“Okay, maybe I am,” he mumbled as he pulled the bar all the way to the top. The hologram flashed FULL POWER and disappeared. The familiar warming deep inside the suit started to ripple across his fur and through his chest. And not a moment too soon either. A squishy appendage covered in suction cups ensnared Vincent with lightning speed. The floor rocketed away as he was lifted up and brought face to face with the monster.

It screeched in his face, and Vincent tried to move his face away. “Ugh, bad breath,” he said with his tongue stuck out. The tentacle struggled to keep hold of its adversary as Vincent thickened and widened. It didn’t take long for him to be able to pull it apart just by flexing. And he was still only on the first couple levels of growth. He’d need all 11 to take on a monster this size.

Vincent jumped to the ground and turned to face the octopus. He flexed a single bicep and winked at the creature. “You sure you want to take this on? Ain’t slowing down you know,” he said. The creature, either unimpressed or not understanding, lashed out with several tentacles at once. But Super Vince wound up and decked each of the tentacles without breaking a sweat. His arms bulged with each shot, and his stance widened. He looked for all the world like the Hulk now with all the bulk he had on his frame.

The suit held up admirably, stretching and straining with each movement. But it was getting more difficult to deal with the slow swelling between his legs too. Being a superhero meant focusing on the job, no distractions when saving the day. But Nina’s suit only knew how to make everything bigger. All he needed to do was take care of this eight-legged freak.

When the final tentacle whipped out Vincent instead grabbed hold. The giant octopus flopped forward when he pulled on it and finally he grabbed each of the tentacles he could reach. “Gotcha,” he said with a smirk. He began to spin around, twirling the octopus like the world’s strangest dance partner. The octopus squealed as Vincent let go and it cannonballed into an abandoned construction site. The steel girders wrapped around him as it collapsed.

Still not satisfied though, he leapt over (in a single bound no less) to tie up the beast with those girders. They bent like paperclips as the hulking squirrel flexed. Another day saved, quickly and with minimal damage to the city! All thanks to the super suit of course.

But speaking of that super suit, the growing still hadn’t finished. Vincent blinked as his shaft started poking at his pecs. That didn’t seem right. Normally he’d be done at this point. He pulled up the POWER hologram again, and sure enough it only read 4.

“This is four? But… 7 more levels after this?” Vincent gaped. That could be a problem. Big messes were incoming. Very big at this rate.  But spectators were starting to come out of the woodwork now that the danger had passed. It wouldn’t be long until the police arrived. No time to waste, he needed to get away.

 He smiled at the citizens politely, even as the throbbing in his muscles intensified. But as he tried to back into an alleyway to make a quick escape he was met with a strange problem: he was too wide. His shoulders bumped into the brick walls stopping his retreat. Now there was a crowd of people in front, taking pictures and cheering or some even approaching to grope at the still expanding squirrel.

“C-Citizens, if you could just… back up a bit… I’m having some… p-problems… ohhhhh,” Vincent moaned. He tried to turn to the side and squeeze into the alley but things were going faster than he could keep up with. The leaking pre had shorted out his suit’s circuits yet again, and he began to bloat cartoonishly. Now he was caught with his back against one alley wall and his cock pressing against the other side.

The Hulk would look like a child at his size. Even the last time this happened looked like nothing now. The bricks crumbled as Vincent struggled to get free. He squirmed and squeezed but all it ended up doing was rubbing his length and balls against the wall, getting him more turned on. He could feel his body trying to get taller to keep up with the muscle growth but at this point it was a losing battle. Those thick squirrel hands began to pump up and down whatever parts of his length he could reach, desperately trying to finish off so he could stop the growing.

The brick walls couldn’t stand all the pressure being placed on them. They crumbled but even still Vincent couldn’t move much anymore with all his muscles struggling against each other for space. Easily 15 feet tall or more, and widening at breakneck pace, Vincent gave in entirely. The lustful, dark part of his mind wanted more now. He grinned down at the locals below, even as one of them started rubbing his balls in an attempt to help. That worked just fine for him. He could really show off his size this way.

The POWER bar was warning him that he was dangerously exceeding the usual size constraints of the suit’s design, but he muted the notification just as soon as it came up. That didn’t matter right now. He grinded against the brick wall as it lowered just below his head. He could reach out and lick his dick now, teasing himself further. He felt like more cock than squirrel at this point, and his muscles tingled with even more mass.

The thought of growing even further, just continuing his size gorging, was enough to push him over the edge. His suit strained at the seams as his body clenched all over and flooded every inch of his suit. The spurt of cum shot from the top of the alleyway and coated the roofs of buildings around the entire block. He sat there in ecstasy for minutes on end, and the whole time he didn’t stop his expansion.

But the time it was all said and done, Vincent found himself resting on his back in the rubble of the building behind him. Easily taking up the entire space the building used to be in, each of his muscles twitched violently with all attempted movement. He could still feel a dull throbbing through his core… maybe the growth hadn’t stopped yet? It didn’t matter. He felt like a boulder. Stronger than those puny walls he’d destroyed just moments ago.

“Hope you enjoyed yourself there cutie. But you’re not finished yet,” a feminine voice cooed in his ear. Oh. Nina. She had seen the whole thing- wait, not finished? And that’s when Nina pressed her own remote growth button.