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Big Dog Testing

By Cimmaron Spirit

Commission for Gausswolf

WARNING: This story contains: malamute, wolf, growth, muscle growth, cock growth, sheath growth, ass growth, macro, size difference, hyper, M/M, anal, cum inflation, excessive cum and more. If you aren't 18 or older, or if you think animal people getting bigger through reality breaking plot devices and having sex afterwards isn't your thing... why the hell did you click on this? Almost all of that was in the keywords or the thumbnail icon! Yesh.... Otherwise, enjoy!

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The doorbell rang, making the ears of both canines sitting in the living room perk up at the same time. Gauss was quickly on his feet, the red and white furred malamute, wearing a white tank top and a pair of grey sweat pants from their recent workout, was dashing to the door as fast as he could to catch the delivery guy before he could scamper off and leave a "missed you" note.

With a brief exchange of words, and then a scribble on the digital notepad, Gauss was left with a small box in his hands as the delivery man walked back to his truck. Gauss turned around, using his foot to close the door behind him, and returned to the living room.

"What do you have there?" Dravu asked, the black and grey wolf cocking his head to the side, the ear with the gold ring piercing flopping over his head. His blue t-shirt and black shorts were also a bit damp with sweat after a couple hours spent at the local gym and jogging.

"Oh, just a little present for you," Gauss said with a smile, brushing some of the brown mane that contrasted with the rest of his monochrome body.

"Let me see!" Dravu said, nearly jumping off the couch in excitement.

Gauss chuckled, using a claw to cut through the packing tape, then dug into the crumpled paper used to protect the package, before he pulled out a cartoonish looking ray gun, like something out of a 1950s science fiction movie.

"Is that... a growth ray?" Dravu asked. "I swore I've seen something like that before."

"Yeah, it was from that TV show where that horse was showing off his fancy inventions. I'm still pretty sure it was just a bunch of special effects, but I got the gun for you anyway. Happy Anniversary!"

Dravu's eyes were wide, and he was nearly vibrating with excitement. Gauss knew he would be, because even though Dravu was taller than average at six foot even, the red and white malamute was a full foot taller than him. And the wolf was not so secretly wishing to be at least a few inches taller. If just to not feel like he was being dwarfed by the taller, more muscular malamute.

And for $10, including shipping and handling, Gauss was happy enough to let his mate play around with it. Even if it was a joke, a prop from that silly TV show ("Doctor Cimmaron's Amazing Gadgets," if Gauss remembered correctly), he wasn't out that much.

"Well, come on!" Dravu said, standing up, holding his arms out.

"Hmm?"

"Try it. Shoot me with it! Let's see if it works!"

Gauss looked at the black wolf now standing in the middle of the living room, surprised at just how eager Dravu was.

"Uh... you know it might not actually work, and it's just a scam, right?" Gauss said.

"Then why did you buy it? Not even to try it out?"

Gauss opened his mouth to reply, but then closed it. Well... he did kinda want to see his mate get bigger. He so desperately wanted to, hence working out and all that. But he must have had a high metabolism, because the wolf wasn't getting any larger, much to his disappointment.

And, after all, happy wolf, happy life, right?

Gauss shrugged his shoulders, and lifted the ray gun up, aiming it at Dravu's chest. The green, blue and yellow gun, with plastic disks around the antenna one the front, was rather tiny and light. Lights began to blink all over, though the malamute had no idea what the meant.

He pulled the trigger. There was a loud click and twang somewhere within the ray gun.

Nothing happened. No ray of energy, no green radiation to engulf the wolf. Nothing.

There was a long pause, Gauss still holding the gun at his mate, who's wagging tail slowed down.

"I guess it doesn't work?" Dravu said, disappointment in his voice.

"I guess not." Gauss let go of the trigger, then turning around to look at the box.

"Well, that was a waste of ten bucks," Gauss sighed, setting the gun back into the box. "All well. I bet shipping it back to wherever it came from will be more than that." He turned back to Dravu. "So I guess we... we..."

The red and white canine froze in place as he watched Dravu grow. Inches were added to his body in moments. The tight-fitting workout clothes grew even tighter over the wolf's frame. Dravu looked down in amazement, his tail excitedly wagging behind him as he shot up. Six and a half, seven, seven and a half, eight feet tall. Now he was looking down on Gauss, and not vice versa.

A smile crossed Dravu's face. "Oh, we aren't returning that thing at all now."

Gauss was awestruck at the now taller wolf. "It... it worked?"

"Delayed reaction I bet," Dravu said. "Or pulling the trigger charges it, and letting go releases it?" He pondered for a moment, before grinning. "Maybe we should test my hypothesis..."

"Oh no..." Gauss said, not liking that mischievous grin one bit.

"Oh yes," Dravu said, as he walked up.

"No, no, no," Gauss exclaimed, turning on his feet and running to the box where he had set the growth ray, and snatched it before the black wolf could.

Dravu wasn't going to let Gauss get away that quickly, and pounced on the red and white canine. Gauss began to stumble as the now bigger wolf on his back offset his center of balance.

"Hey! Stop it!" Gauss exclaimed, as he tried to both remain standing and keep the growth ray from Dravu. "You already got bigger!"

Dravu reached down, grabbing hold of the ray gun with hands that now overshadowed the malamutes, and yanked it out of Gauss' grip, before jumping off and heading back for the living room. His balance suddenly returned to him, Gauss lost it immediately again, and the malamute crash to the floor in a daze.

"Yes, you are right. I did get bigger," Dravu said, as he looked over the gun. "But I want to get even bigger than that!"

The wolf and noticed a dial on the side of the gun. He curiously turned the dial, and his eyes went wide, before he devolved into a monomaniacal giggling spree with each clicking turn of the wheel.

"Oh, this is going to be fun!"

"Dravu... no... c'mon man..." Gauss moaned, as he got himself off the floor.

But the wolf wasn't going to listen to any voice of reason or restraint. He pointed the gun right at his chest, pulled the trigger, then let it go. Then he pulled the trigger again. And again. And a few more times for good measure.

Dravu was suddenly shooting up even taller. The clothes he was wearing and had been stretched tight after his first growth spurt began to rip and tear along the seams, the cotton and polyester giving away, black fur quickly filling in the gaps.

From eight feet to nine, to ten. His shirt was soon in rags and tatters, leaving his lean and fit body on display. A loud rip as the seat of his shorts finally gave out, followed seconds later by the front, leaving a tightly constrained package in boxer shorts, the elastic already stretching to its limit. But with another surge upwards, even his underwear gave up the fight, the last strip of clothing on Dravu's body failing, leaving the wolf in the nude.

Soon his ears were pressing up against the roof, twelve feet from where his expanding paws touched the floor. The floorboards began to creak and groan from the sudden weight on them. Every time he shuffled his feet or stretched his body, the whole house began to creak and groan from the hundreds of pounds of Dravu that was suddenly appearing.

And still Dravu kept growing. Soon he was forced to bend his head as he could no longer comfortably stand upright at thirteen feet. Then he was forced on his knees at fifteen, the shockwave knocking pictures off the wall. At eighteen feet, he got onto all fours, straddling and casting the stunned and awestruck malamute into shadow under the giant's body. The movement to top Gauss knocked the flat-screen TV off it's perch, crashing to the floor, while shoving the couch opposite it into the open kitchen area. His feet were pushing up against the far wall, and cracks were already starting to snake out from the point where his feet pushed against the painted drywall.

At around 20 feet, over three times his previous size, did the growth spurt finally end.

"Ohhh, this feels really nice," Dravu rumbled, his voice like a thundercrack to Gauss under him.

The red and white malamute could only look over his mate, unable to articulate the feelings of being so overwhelmed, and so quickly! How the wolf had quickly become the largest person in the world, as far as Gauss knew. Not just a bit taller than Gauss, but excessively huge.

Gauss was definitely not the big dog anymore.

Dravu was looking over his body from his vantage point, a large, goofy grin plastered on his face. "Ohhh, this is a good size, ain't it? I think I could get used to something like this."

"Y-yeah... I think you are plenty big now," Gauss agreed.

"Plenty big. Sure." Dravu said, smirking. "But not big enough."

Gauss' eyes went wide. "Y-you are already giant! You are massive! Any bigger and you'll bring down the house!"

Dravu chuckled, before picking up the growth ray, kept safe this whole time in his hand. In fact, it had actually grown itself to accommodate Dravu's new size.

"Ohhh, that's a neat feature," the wolf smirked, as he held up the gun that had to be over four feet long, over half as tall as Gauss was. "But there are a few other things I want to test. Because there are more settings than 'tall' on here. So I wonder what this setting is."

There was a flick of his fingers on the dial, and Gauss could see the display change, from "General Height Increase" to "General Muscle Increase."

"Oh no..." Gauss whimpered.

"Oh yes!" before turning the growth ray on himself, and pumping the trigger several times.

His entire body exploded with new muscle mass; hundreds of pounds of meat being pumped into his body in seconds. Lean arms suddenly doubled in size, then doubled again. Veins popped against the slick black fur over biceps and triceps that looked more like mountains than arms. His chest exploded outwards, massive pecs that dwarfed Dravu's head, followed by a deeply etched abs, six bricks of pure muscle where a flat stomach once was. His shoulder ballooned out, massive trap muscles connecting them to the back of his head. His calves and thighs thickened into tree trunks, more like redwoods than the willowy poplar's that the wolf used to have.

In a moment, he instantly dwarfed even the well-built Gauss, making him look almost like a thin, willowy twink in comparison to the now utterly jacked Dravu. In just three minutes, the wolf was blowing past bodybuilders who had spent their adult lives working out and sculpting their bodies to show.

And all Dravu had to do was use a ray gun that defied all the laws of physics.

"So, how about that, eh?" Dravu rumbled, lifting up an arm, punching a hole into the ceiling as he flexed, his arms growing even larger, the hills turning into mountains of muscle, acres of fur rippling against muscle that would have made any bodybuilder green with envy. "Think that I'm such a small pup now, huh?"

"I... yes... it's... nice..." Gauss mumbled, as his eyes were focused on the rather large and exposed sheath between the wolf's legs, and the red tip that poked out. His junk had kept in proportion with the growth apparently. Considering that Dravu was about eight inches before, that would make the cock inside that sheath over 26 inches long. Over two feet in length. He'd be about as thick as a two-liter pop bottle as well, not to mention his knot. Dravu's balls had also grown; the ping pong balls were now softball sized.

That thought hit Gauss particularly hard: he was a couple inches more than a foot down there. The red and white canine had always been rather cocky about his impressive endowments over the years, winning many a size comparison with even stallions.

When Gauss didn't comment, still staring at the intimidating cock slipping out of his wolf's sheath, Dravu looked down, before grinning again.

"Oh, I see what's got your attention," the wolf smirked. "Let me help you with that."

The wolf rolled his hips forward, shoving the fuzzy sheath into Gauss' face with a muffled yelp, turned into muffled moans as the malamute began to lick and stroke his mate's enlarged junk.

Dravu let out a rumble as well as Gauss began to lavish his sheath with his tongue, making his penis start to slip out, inch after inch of red flesh.

There was a few more clicks from the size ray still in the wolf's hands, though Gauss couldn't hear it as he continued making out with the fat sheath.

He did notice when the sheath suddenly grew bigger and heavier, pushing him into the floor.

Gauss thought that maybe Dravu decided to change position and ram his groin into Gauss' face, as they both knew that the red and white dog loved some sheath play. But as he wiggled out to try to catch his breath, he realized that it wasn't Dravu simply shoving Gauss' face with more of his sheath.

There was more sheath all together!

Peaking out from his furry prison, Gauss swore that his mate had made his own sheathe at least four times bigger than before. And his testes now had to be closer to a pair of beachballs, and rather large ones at that. And with that, the cock inside must have grown so, so much bigger.

Rolling his head back, Gauss could see the red tip of Dravu's cock, now fully emerged from it's hiding place, stretch almost ten feet from the base of the sheathe. Gauss had no idea if he would have been able to wrap both arms around it. He didn't know if Dravu would have been able to wrap both of his hands around the shaft and have his fingers touch. The fat knot at the bottom was even more massive, almost double the diameter of his cock.

Each throb and pulse of Dravu's cock was like an earthquake to Gauss below, each pounding heartbeat of the giant over him sending tremors through his own body. The malamute could feel his own cock strain painfully against his pants as he was forced to rub against Dravu's sheath and cock, which only made the wolf rumble in pleasure.

"Dravu... you... you are way too big!" Gauss panted, trying to push the cock out of his face and get out from under his giant. "Please, c'mon, stop it!"

Dravu let out another rumble of pleasure as he felt Gauss struggle against his cock, a shudder as his sensitive manhood was stroked and prodded and rubbed.

"You know, I got another idea," Dravu said, reaching under his cock and easily picking up Gauss, the seven-foot malamute like an oversized toy to the twenty-foot tall, ripped and hyperphallic wolf, and pressed him against his chest. Dravu then sat up, then back down in the middle of the living room. The impact of his ass on the floor sent a shockwave rippling through the house, causing dishes to crash in the kitchen and the whole building to shake as he snapped and broke some of the flooring, leaning against the wall and making it buckle and crack under his weight and strength. He kicked both legs out, letting his beanbag chair like nutsack some breathing space, easily brushing aside the couch and chair and table in the way. Dravu's ten-foot cock was now able to stick up and out, like a red rocket ship ready to blast off. Preseed was already leaking profusely from the tip of his cock, running like a waterfall over the shaft and veins, splashing to his balls and the floor.

Dravu then lifted up Gauss in one hand, using his claws to rip away at the clothing that the red and white malamute with the other. The t-shirt and sweats were torn away without any sense of preservation or care, until Gauss was just as naked (if a lot smaller) than the giant wolf.

"I can see that you are enjoying this, eh?" Dravu smirked, as he poked at Gauss' now outmatched 14 inches, standing at attention and throbbing painfully.

"I... I can't help it if you are sexy while you are huge," Gauss huffed, somewhat embarrassed in actually admitting it.

"Then why did you want me to stop?" Dravu asked, raising an eyebrow.

"Because! C'mon, now that you are this big, how are you going to work? How are you even going to leave the house? And, like, seriously, what are you going to do with that thing?" Gauss asked, pointing at the huge cock.

Dravu smirked. "We can worry about things like a job and getting out of here later. But I know exactly what I'm going to do with this thing." Dravu grabbed his cock to hold it steady, then set Gauss down, ass first on the tip. Preseed quickly soaked Gauss' ass and tailhole.

Gauss' face went pale. "Oh no... you can't be serious. That is way too fucking big! Your cock is almost the same size as my hips! Your knot is wider than me!"

Dravu smirked. "Well then I'll just have to make you the right size."

Gauss had a moment of relief, thinking that Dravu was coming to his senses, and shrinking himself to a much more manageable size. Hell, even two feet, while bigger than anything the malamute had taken before, would be at least somewhat feasible.

But then paused, working that sentence through his head again.

"Make... me ... the right size?"

As if an answer, a cold metal tip pressed up against his asshole, making him wince, followed by the multiple click-click-click of the growth ray.

What happened next Gauss couldn't see as it was both behind and below him, but he could for sure feel. It was like his butt had been turned into playdough by some horny god, stretching and molding his rear. His tailhole swelled larger, turning into a large donut that, had anyone seen it, would have assumed belonged to one of the most dedicated bottom size queens in the world, and then some.

"Turns out that you can change the size of particular body parts, and not just over all," Dravu said with a lewd smile. "That's how I got my dick this big. And I'm sure it should work for this too."

"No, no, nooaaaAAAAHHHH!" Gauss cried out, as Dravu's cock slipped into his ass.

It wasn't painful. The copious lube from Dravu's pre was more than enough to make it slide in. It was just a surprise that he was suddenly being penetrated by a ten-foot cock.

Everything about his body felt different: everything was stretching and expanding to take in the massive fuckstick, his stomach somehow taking in every inch of the huge cock. Gauss groaned, reaching down and feeling the bulge as Dravu's shaft went deeper and deeper into him, feet of manhood easily slipping in, his six pack being replaced with a single muscle, deep inside his guts. Gauss closed his eyes, bracing himself as he felt his body stretch more and more, going to impossible lengths and sizes...

"Holy fuck," Dravu groaned as he pushed the malamute further and further down his cock. He had his time fucking Gauss before, as Gauss had with him many times as well, but this time felt so much better. Was it the size of his cock? Or Gauss' ass? Both? Or just the fact that Gauss was basically a fleshlight for him now?

Dravu shuddered as Gauss' donut kissed against the top of his knot, eight and a half feet or so of cock now stretching the red and white dog's stomach. Giving Gauss a moment, but just a brief moment, to catch his breath, before he began sliding the malamute over his cock like a sex toy.

"Look at that, eh? Almost my whole dick, inside you," Dravu said after several rounds of lifting up and dropping Gauss over his shaft. "And you said it couldn't be done?"

Gauss, panting, moaning, could barely speak, to try to convince his mate to stop, to shrink back down.

Or to keep going, and fuck him harder.

"Let's see if we can get it all in, why don't we?" Dravu rumbled, before picking up speed, smacking Gauss' ass over and over again against the bulbous knot.

Gauss panted and groaned, his stomach stretching, then contracting, over and over again, faster and faster as Dravu began to pick up speed, hitting Gauss' g-spot with every thrust. His prostrate was abused repeatedly, nearly pushing him to climax every time that Dravu shoved all of his cock into Gauss, only relaxing for a moment as the fat tree trunk of a cock slipped out, before being rammed in again.

But no matter how hard they tried, how forceful the giant was, or how much preseed lubed the red and white dog's ass, the knot refused to go in.

But there was a way to fix that.

Dravu, even while still bouncing Gauss up and down over his cock, reached for the growth ray, and pointed it at Gauss' ass.

"I'm getting that whole thing, one way or another," Dravu growled as he lifted Gauss right up to the tip of his cock.

"No...no... c'mon..." Gauss moaned

Click.

Gauss groaned as he felt the invisible hands once against play with his ass, stretching him wider, making the feeling of being a tight sleeve over the fat dong fade, as he was able to loosen up a bit more. Dravu pushed Gauss down to the knot.

But the knot still wouldn't go in.

Dravu grumbled, lifting Gauss up again. He was getting close, he knew it.

And he wanted to turn Gauss into a living condom.

"Please..."

Click.

Once again, Gauss' ass stretched again. And this time when he was forced down, he could feel his tailhole starting to stretch over the knot. That made the tightness return with a vengeance, and Gauss to grit his teeth and force his eyes close.

But it wasn't enough.

Dravu was getting so close...

"Fuck!" Dravu snarled, lifting Gauss up again. "I'm so close!"

"Ahhh!"

Click. Click. Click.

The malamute's ass grew again even bigger than before.

The wolf slammed Gauss over his shaft several more times, each time forcing Gauss to take more and more of the fat knot...

POP!

Both dogs howled, Dravu's voice loud enough to make the windows rattle and house shake. With the last thrust, Gauss was tied. The whole ten feet of canine cock, and the massive knot at the base, was now inside the red and white dog. His hips looked as if he had suddenly been stretched like a puppet, wider than what should have been possible.

The sensation of his ass stretching that much was finally too much for Gauss, and he came, his cum rocketing from his cock and arching over the remains of the living room, landing around Dravu's feet, even as the giant wolf continued pumping Gauss over his cock, to get to that final peak...

"Here... I... CUM!" Dravu bellowed.

As if a firehose deep inside his body had been turned on, or a dam burst allowing a reservoir to flood a valley, the wolf's cock began shooting cum deep inside Gauss' body.

Already stretched by the cock, the only place for the cum to go was out. The malamute felt his body stretch and balloon by the second: first as if he had pushed a soccer ball under his fur, then a beachball. Then a boulder. His belly began to round out and dome as gallons of virile wolf semen flooded his guts, stretching him wider and wider.

Gauss could only moan and watch in amazement, feeling the hands on his stretched belly be forced outwards as his belly filled up and stretched. All the work he had done for abs was rendered useless, and he almost looked like he was pregnant with triplets.

It felt like hours or days to the malamute's lust addled mind as he felt rope after thick rope of seed fill him, more and more cum stretching his body to the limits, as if he was little more than a living condom.

"Ahh... ahhh... whew... That was intense, wasn't it?" Dravu panted, as his orgasm ended and the afterglow settled down over him.

"Uggghhhh..." Gauss moaned, feeling as if he had had eaten at five all you can eat buffets, and cleared them all out. Each throb of Dravu's cock made the cum inside him tremble and ripple, making his stomach feel like a waterbed.

Dravu leaned against the wall again in exhaustion, but it finally gave way after so much abuse. Dravu's head and muscular upper body smashing through the wall, and landing on their king-sized bed, smashing the bed frame, but able to use the mattress as a pillow.

"Gauss... thanks for the present," Dravu mumbled, before he passed out, snoring.

Gauss, still tied, unable to move, his stomach gurgling with more cum than should have ever been possible, also began to doze, catching sight of the enlarged size ray that had slipped out of his mate's hand.

And plot his revenge.

Maybe it was time to test the size ray himself?