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Collars

"So what did you want to show me Sero?" Gates, a brown fox leaned over, examining some of the test tubes and bubbling beakers in the lab. The blue and white collie, dressed in his usually lab coat, was looking alongside a shelving display for something.

"Just a new toy I thought you would like to test out." He called back adding, "And don't touch anything."

Gates quickly sat back down a beaker and awed as Sero tapped his muzzle, thinking. A few seconds later there was a quick "Aha!" as he reached up and pulled down two small wooden boxes. He turned and sat them on a table, Gates peering at both.

"So...this is...?" He perked an eyebrow. Sero opened them both to reveal two identical brown leather collars.

"Heh, sorry Sero. I'm not into that bondage stuff." The fox laughed and stuck out his tongue.

"Oh yeah? What about at that club the one night?"

"Hey! That was one time and you promised not to bring it up!" The fox huffed. "Anyway, I didn't enjoy enjoy it."

"Your erection said otherwise." The collie snickered, Gates' ears flushed red. "Anyway, this isn't like that. You see, these collars are linked to one another, allowing you to control anything about them. Size, gender, species, you name it, its done."

Gates' eyes lit up, but then drooped. "Won't they just snap off if grown too large?"

"Nope. They actually half meld into your skin, sorta becoming part of you and also being affected by the changes." The collie smirked, lifting the collars out and handing on to Gates. The fox peered at it in his paw.

"Is it safe?"

"Pretty sure it is, haven't had any problems yet." Sero slipped his own on, clasping it. Gates shrugged, having nothing else better to do today and doing the same. There was a slight tingling feeling around his neck, which he assumed was it melding into him. It actually felt like there was nothing there at all now.

"So how does it - meep!" Gates yelped, watching as the world and his clothing expand around him, holding up his pants as he became mid-waist tall to Sero. "What the hell?" He growled up.

"Hm, still working on organic things only, and no deformations. Yep, working perfectly!" Sero chuckled.

"Grow me back!"

"Alright, alright squirt." Sero snickered, growing Gates back to normal as the fox adjusted his clothing.

"Okay, so how do I change you?" Gates grumbled, straightening his shirt.

"Not here. I would like to keep my lab intact." Sero began to head up the stairs. "I know a good place to start."

Gates grumbled and folded his arms, but followed.

They drove out of town to a valley before going off onto a dirt road and stopping without a house in sight.

"Okay, so how does it work?" Gates asked as they got out of the car.

"Just give the mental command in your head. It'll go by anything you say, literally."

"So, like this?" Gates grinned as he thought. Sero's eyes bulged as he gasped, groaning as he gripped the roof of his car. A loud ripping sound was heard and Gates ran to Sero's side of the vehicle. He couldn't help but laugh at the sight. Sero's sheath and balls had literally grown out of his pants. The collie grunted and glared, adjusting to the new weight.

"Not funny."

"Payback for shrinking me." The fox sneered.

"Oh yeah?" Sero grinned, watching as Gates began to quickly grow.

"Hey wait! These are my best clothes! Let me take them off first!" Gates yelped, trying to unbutton his pants. I was no use though. His button popped off quickly, his pants straining as tears began to split open along his thighs. The growing canine grimaced as his shirt buttons began to pop off one by one down the middle, splitting it open, alleviating some of the strain on the sleeves.

"Oh, by the way, you can also say how fast it should change, except it can't be instant." Sero snickered, increasing the speed enough to make it appear like the remains of Gates' clothing exploded off of him. The fifty foot fox groaned and looked down, seeing the collie half erect from the show.

"You're gonna pay for that." He grinned, and sent the command. Sero yelped as he too began to grow, but not just in size. His chest began to thicken and push outwards, his biceps and triceps shifting and growing as thick chords of muscle bulged under his fur. A full six pack formed on his abs as he groaned and panted. The thighs were next as they ripped off the last shreds of clothing, fighting for space with his sac. His calves bunched and became more well defined, even under the fluffy fur. Throughout the process, the collie's shaft began to rise and harden, just stopping under the chiseled chest. Soon enough, the fox was looking at a fifty foot collie who would win a muscle contest hands down.

"Much better." Gates snickered. Sero smirked as he flexed, turning and showing off his thick body, his back looking sculpted from rock with its muscle all the way down to his tight ass.

"Foxy like?" He smiled, looking over his shoulder.

"Foxy love." Gates murred and hugged from behind, the collie feeling Gates' own cock hardening against his back. Sero grinned, increasing the member's girth and size, with an added benefit. He could feel the shaft rising up along his back as the fox moaned, then meeped.

"Sero, did you just give me an extra testicle?" Gates shuddered, then meeped again.

"No, I gave you two." He smirked back. Gates moaned as he began to thrust against the collie's fur as his shaft grew, pre leaking down the shaft before the member stopped just under his chin, his sac bloated large enough it hung at his knees.

"Ohh...bad collie. Big, sexy, evil collie." Gates moaned, Sero's size increasing once more rapidly that Gates couldn't keep his arms around the waist. He stepped back and looked up lustfully as the canine began to loom over him. Soon enough, the fox only came up to his ankles. Sero turned around and chuckled, looking down. His foot sank into the earth easily with the step.

"Come on collie. Show me what ya got." Gates gawked up as Sero laughed from the comment, his voice echoing as he began a small flex performance, showing off his his physic and giving some playful growls. Gates shuddered as he slowly stroked his immense shaft as he began to change the collie further, watching as his upper front canine teeth began to extend from his muzzle, his claws growing sharper and his fur shaggier. The collie murred at the changes, leaning back and letting out a howl, Gates almost cumming on the spot.

"Damn that's so hot!"

Sero grinned at the fox's words, licking one of his long canines.

"My turn."

Gates yelped as he began to quickly grow, his feet sliding along the ground. His eyes widened more as his sheath tingled, a second cock growing from his sheath, swelling to the size of the original. He groaned and gasped, gripping both as best as he could with his hands and stroking.

"Yes! Fucken yes! Bigger! Make me huge!" Gates cried out, feeling his sac churning with seed as both shafts constantly leaked pre. He was so caught up in the bliss he didn't even realize he had stopped growing till he opened his eyes. Panting, he leaned forward, gasping as he could see a gray outline in the distance, the city. He had to be at least two miles tall!

Looking down, the mega fox could barely make out a tiny dot staring up at him.

"Heheh, good collie, but I don't want to be alone up here." He smirked, quickly growing Sero to his chest height, with and added touch of sprouting a pair of draconic wings. Sero cooed and smiled, giving them a flap, uprooting trees and blowing away any homes close enough.

"Such an naughty fox." Sero joked, taking both shafts into his hands, giving a squeeze. Gates gasped and moaned, pushing the collie onto his back, shaking the earth and causing a few buildings in the city to crumble from the quake as the fox laid on top.

"Yes, very naughty." He smirked, licking slowly along Sero's shaft. The collie grunted and gave a slight thrust, pre soaking into his stomach fur. That didn't last long however as it began to grow again, sliding upwards towards his muzzle and thickening all the same, soon going pass the collie's head before finally stopping. Gates continued to lick along the massive shaft, nipping gently along the veins and head. One paw groped and squeezed the knot at the base as his other groped the immense sac, pushing the thick thighs apart as it grew down to the collie's shins. Sero grunted and whined, his thick and deadly claws digging into the earth like butter, unable to hold back any longer. His howl shattered glass as he came, his semen landing just east of the city, covering roads and sending a slow tidal wave towards the inhabitants. The orgasm itself lasted at least a full minute before the collie slumped back panting, enjoying the afterglow, mumbling something.

"What was that big guy?" Gates' ears perked forward.

"Bigger."

The fox chuckled and obliged, the collie sitting up and beginning to grow again. "Fine, I'll make you big. I'll make you huge!"

Sero only panted down as Gates began to dwindle before him. He scooped him up in two hands and smirked.

"Don't stop." He opened his maw, starting to lick and tease the fox's two shafts. Gates moaned and began to thrust as best as he could into the expanding dog, feeling his sac straining to contain his load.

The furs of the city looked up in horror as a mass of white fur began to overtake them, the collie's expanding ass growing over top. Skyscrapers were no larger than a strand of fur, subways collapsed from the sheer weight. Sero closed his eyes as he took both shafts into his maw, sucking them at the same time. Gates was pushed pass his limit and came, going much longer than Sero had. The amount was enough to fill each Great Lake ten times over, but to the collie, it was a mere drop. Sero released Gates down on to his chest, watching him disappear from view as he grew.

It finally ended after a few more minutes, the colossal collie covering most of North America, able to see the curve of the Earth and easily Europe across the Atlantic. Smiling, it was only a few mere moments before Gates was laying on top of him, snugging into this chest, just under chin high to the fellow canine.

"Have fun stud?" Sero smiled, foozling Gates' hair.

"Best invention ever!"