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Testing the Limits

By Cimmaron Spirit

Commission for Kalendil

WARNING: The following story contains: hyper cocks, cock growth, muscle growth, macro growth, cum inflation, very, very excessive cum, size difference, destruction and a threesome. If you aren't old enough or it doesn't interest you, then begone! Otherwise, enjoy!

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"So, having fun yet?"

Cen panted and heaved, little moans escaping his lips as he tried to catch his breath. "I- well, yeah," the rottweiler finally got out. "I'm... wow..."

The big black panther smirked, reaching behind his head and subconsciously flexing a massive bicep, making Cen's mouth water at the sight. Gage was the biggest guy at the gym, with biceps that dwarfed Cen's head, pecs and abs carved from black marble to perfection, Broad shoulders that made walking through normal doors a challenge, and massive calves and thighs that could crush watermelons without thinking about it.

But he was also big in the other department. Gage's ebony pole was over a foot and a half long, and thick enough that it took two hands to wrap around, and his balls were as big as cantaloupes.

Cen was nowhere near Gage's size. For one thing, he was at least a foot shorter, and while he had worked out most of his adult life, he was more athletically fit than the bodybuilder-superhero-god Gage.

"Well, maybe we should kick this up a notch, eh?" Gage grinned.

Gage easily scooped up the rottie, positioning Cen to straddle the giant cock, and the two began to make out again, this time the rottie grinding his bubble butt over the hard, pre-drooling pole. The rottie had taken big things before, but Gage was going to be his biggest challenge yet...

Well, that's where the experimental drug he took earlier was supposed to help, allowing his body to stretch and flex more than normal. The black and red furred deer that gave it to him swore up and down that it would allow Cen to take anything up his ass. "I hope you're up for a challenge to see how much you can take," the muscled deer in the suit smirked. That image, those words, were seared on Cen's brain. He just couldn't shake it...

Hopefully he was right.

Gage's tongue easily overpowered Cen, pushing in to French kiss the rottie, who moaned around the thick tongue and wet, sloppy making out. All the while, Cen's hands explored all of the massive panther's body, feeling up every rock hard muscle.

"Well, nice to see you two are having fun."

Gage and Cen froze in place, and looked over to see a big tiger standing in the entranceway to the living room. Cen's eyes went wide. The tiger wasn't quite a carbon copy of Gage, but he was pretty close: thick and muscled all over, and a muscle gut that showed that he was strong, yeah, but maybe didn't care about his diet as much as Gage did.

But underneath that dome was really what got Cen's attention. The tiger's sweatpants struggled to hide a massive bulge, two orbs that easily outclassed Gage's, and a half hard pole that made the grey cotton bulge more.

"Oh, hi Kal," Gage said. "I thought you would be gone longer."

"Dude, it's six. I always get home at six."

Gage looked at the clock on the wall, and gave a small chuckle. "I guess we just got carried away."

Kalendil rolled his eyes, and walked out of the living room. "Just don't make too big of a mess, okay?" he shouted.

Gage looked back at Cen, who was still staring where the big tiger was.

"I-I didn't know you had a roommate," Cen nervously said.

"Well, this is actually his house, and I'm the roommate," Gage replied.

"So, like... friends with benefits?"

"Plenty of benefits," Gage grinned.

"So us two won't be a problem?"

"Hah! Of course not," Gage laughed. "I bring guys home, he brings guys home. Hell, we even share sometimes. So, if you are up to it... we could have a third join us if you want."

Cen felt his whole body tingle. Two big cats? Was he in heaven?

But would that drug he took handle both?

"But, how about just us two for now, eh?" Gage smirked, as he flipped Cen over onto his stomach on the couch, his cute butt up in the air, the little nub of a tail wagging as he eagerly waited.

Gage wasted no time, licking his fingers and firmly, but carefully, prodding the rottie's tail hole. Cen couldn't help but moan out loud as he was toyed with.

"Man, you are eager, aren't you?" Gage said, his finger easily sliding in and out. A second finger slid past Cen's pucker, and it easily accepted the extra thick digit.

Cen gasped and groaned as a third pushed its way in. It didn't hurt; in fact, it felt amazing, as Gage's fingers probed and prodded inside the rottie's ass.

But Cen knew well that even three fingers, or even Gage's entire fist, was not as big as Gage's mammoth cock. This was just a taste of what Cen would be dealing with.

Gage's fingers withdrew, leaving an empty feeling in Cen's ass. But just as quickly, Gage's cock heavily landed in between Cen's cheeks, spurting preseed over the rottie's rear.

"Ready little dog?" Gage asked with a smirk.

"Yes, please, fill me!" Cen moaned, trying to stretch his legs wide enough to entice the panther to stuff him, and stuff him good.

Gage needed little prompting, and soon the thick, fat head of the Gage's cock was positioned and began to push in.

The short prep beforehand was nowhere near enough. Cen gave a long, loud moan, closing his eyes tight as his ass was stretched wider, wider than anything he had felt before. It never hurt, never sent pain up his spine. Just the pleasurable feeling of being stretched and filled...

Gage grabbed Cen's hips as he pushed his 20 inch dong as deep as he could. The couch groaned as the muscular panther began to rest his weight onto the furniture, while still rocking it back and forth. Wood and fabric creaked and groaned, but the copulating pair paid little attention.

"Man... you're ass is just gobbling my dick," Gage grunted as he kept thrusting in deeper. "You're tight as hell - but - fuck!"

Gage had already gone balls deep into Cen. The rottie continued to moan, unable to say anything as he felt his stomach bulge out from the sheer size of the panther cock.

Well, the stuff the weird deer gave him seemed to work as advertised.

Gage began to thrust in and out, grunting as he started to work up a rhythm. Cen gave a loud moan each time the heavy balls smacked against him, each time the ebony spire was driven in as deep as it could into his body.

"Man, your a noisy dog," Kalendil said. Cen opened his eyes, looking up at another massive, half hard black cock and orange furred balls, even bigger than Gage's positioned in front of his face. The cock was only around 15 inches long, but it was a lot thicker than Gage's.

"Time to put that mouth to a better use, I think," the tiger grinned. Before Cen could say anything between his moans, the tiger grabbed ahold of Cen's head, and Kal's cock pushed into Cen's mouth, and stretched it wide.

Not that he was totally opposed to giving a blow job to the muscular tiger, but the spit-roasted rottie would have preferred a bit more heads up.

But even as Gage continued to pound away, Cen began to suck and lick and minister to Kal's colossal member, just as black as the panther's. He was quickly rewarded with a steady stream of hot, salty precum pouring down his throat.

As the two cats went to town, Cen started feeling... strange. Not hurt, not exactly pleasure but more like... he was rubber. Stretching, forever stretching.

Cen tried to take a look behind him, past the dick in his mouth and to the panther pounding away at his rear, in and out, in and out.

Was it just his eyes, or did Gage seem... bigger? Like, with each breath, each pulse and flex of his muscles, he gained a fraction of an inch in height, a pound or two more in mass.

When Gage rammed his cock into Cen's ass (making the rottie moan around Kal's dick in the process), he was sure he felt it go even deeper inside, making his belly bulge a bit more, his ass stretching wider to take it.

Cen's blood ran cold. Was Gage growing? That shouldn't have been possible... And, if so... was Cen going to be able to take the cat's meat? Did Gage even notice?

He looked straight ahead, at the base of Kal's cock, where the round, rock hard dome of a muscle gut began to push at Kal's nose, the heavy orange orbs slapping against the bottom of his muzzle. With each thrust of the tiger, Cen could feel another half an inch here, an inch there, push it's way past and into his throat, thickening all the while. But when he looked, it didn't actually look like he was getting closer to Kal's crotch.

Why? Cen thought to himself, starting to worry.

I hope you're up for a challenge to see how much you can take.

The words from the strange deer echoed in his head again.

Was that more than a idle boast? Did those pills actually try to to see how much their user could take, by making their partner's bigger?

As these thoughts raced through Cen's mind, neither cat seemed to notice, or care, that they were slowly expanding, or that Cen wasn't moaning as loudly, or thrusting back in time for Gage's push forward, or that he wasn't sucking on Kal's dick like he used to. In fact, they were going faster, prior restraint or inhibitions falling away.

It seemed like something had clicked in both cat's minds, and they were going to fuck the rottweiler with all they had.

How do I get myself in these situations? Cen thought, as the slow but steady growth and rough pounding from both ends took hold.

The first feline to notice the change was the tiger. Glancing down, Kal noticed that things looked... off. Like, Cen was smaller than he thought. His balls also felt incredibly heavy, sloshing heavy and full. He slowed down his thrusting, but he couldn't comprehend what was happening.

But when he looked up to Gage, Kal gasped.

"Fuck Gage... what the hell did you do?"

"What do you..." Gage grunted, before he looked over his body. His biceps had bulged in power, his hands still gripped around Cen's hips had nearly reached all the way around the rottie's torso, and he had grown at least a foot taller, if not more.

Both felines paused for the briefest of moments in their sexual teamwork, only for the straining couch to finally give out, sending all three tumbling to the floor, smashing into the coffee table and walls, the TV tumbling off the entertainment stand, and two very large craters snapping the floorboards where the bigger cats landed.

"Are we growing?" Kal asked. He raised an arm, and flexed. The hill on his arm turned into a mountain, criss-crossed with streams of pumped veins, something he never accomplished before.

Cen managed to finally pull himself off of Kal's cock, but it was a lot harder than it should have been, the tiger's dick having grown almost half as long again, and as thick as a basketball. How the hell did that fit in his mouth? Cen panted, moaning as Gage's colossal dick still throbbed and pulsed, having comically distended the rottie's stomach.

"I... I don't know what's happening," Cen moaned. "I got some magic thing earlier to make sure I could take you... but maybe it's rubbing off? I don't know?"

"You wanted to play with some big cats, eh?" Gage grunted, his voice a deeper rumble than before, sending shivers down Cen's spine. "Well, I think you got it." He grinned at Kal, who was admiring his much bigger, much, much thicker cock, and the beach ball sized testicles that hung down to his knees. Kal looked up to the panther, now with muscles swollen all beyond normal reason, Gage's head a little speck between traps, shoulders and pecs bigger than any reasonable measurement that could have been made. And that on top of his abs, like six cinder blocks instead of simply bricks, and thighs and balls that would make Gage have to waddle anywhere, and his cock clearly outlined through Cen's stomach, pushing the fur and flesh out at a crazy, impossible angle.

Kal sat up in the ruins of his living room, leaning against the loveseat that hadn't yet been destroyed but was now just a small chair for the two giant felines. He grabbed hold of Cen's arm, and by extension Gage's cock, and by extension Gage himself, and rotated them to face him.

"If you are going to make us grow, we might as well get to it, eh?" Kal grinned, pulling the canine closer until Cen's pink cock, a rather respectable ten inches, was lodged between Kal's massive pecs. With a quick flex of his chest, Kal grabbed hold of Cen's dick, making the rottie loudly moan as Gage, on his knees, started running the rottie up and down over his huge pole like a fleshlight.

By now, Gage's cock had grown so massive, and stretched Cen so far, that the panther's cock was impacting the wall above the three. What started as a simple bump that made picture frames rattle started turning into a sludgehammer battering down the wall, busting drywall and smashing support beams, before going straight through the wall and into the kitchen. Gage's head brushed up against the roof with a bump, and with each further feral grunt of power and dominance, his head began to push up against the tiles, pushing them aside and exposing the rafters.

Cen was little more than a toy now. He could feel his stomach starting to slosh, his taught stomach being stretched even more now with Gage's pre starting to collect and pool in his body.

The tiger's cock, still slick from Cen's saliva, was now pushed down underneath Cen and Gage. Each throb of the thick and wide cock lifted Gage's balls up, until Kal's cock had peaked underneath the tiger, spurting clear, sticky pre on the ruins of the living room as each thrust of the tiger sent electric tingles through the sensitive flesh. The tiger was also growing, his legs spread wide to try to find room for his gargantuan balls to grow unimpeded, his back and arms rendering the loveseat under him into scrap until Kal's head was resting against the wall that Gage was doing his best to demolish. Kal, in his last few minutes of clear thought, began to shuffle to the left, to ensure he wouldn't be buried under the two fucking furs on top of him.

Each movement sandwiched between the two massive, and still growing cats pushed Cen past all limits of comprehension and pleasure. His rock hard clock, clamped between tight tiger pecs and pushed further with his prostate bashed and abused by a giant panther cock, couldn't hold back. With a loud, panting moan that was nearly a cry and scream, Cen unleashed his load. The stringy white cum splashed against Kal's muzzle and face and chest, the tiger tilting his neck forward enough to drink in the rottie's juices as he writhed and moaned and shot his load, all the while still being fucked senseless.

In any normal circumstance, Cen's load would have been considered impressive, amazing even.

But this was not normal.

"Fuck... I'm... close..." Gage growled with each thrust, making window panes rattle from his deep, deep voice.

"So am I," Kal rumbled, panting heavily, his claws carving deep trenches into the ruined furniture and floorboards as he tried to find something, anything to hold on to.

"Al...most... there..." Gage announced, before letting out a few more groans and pants, before he unleashed a loud, echoing, booming roar and that made the whole house shake.

The first shot of panther seed filled up what little space inside Cen's body that wasn't taken up by a seven foot long cock that was wider than Cen's whole body now, and then more. Each shot added gallons of steaming hot seed into the living condom, while also pushing Cen up and forcing Gage's cock to slide out, spilling increasingly large amounts of seed over Cen and Kal. Each rasping pant and cumshot bloated the rottie's stomach even more and more. Cen, half in the living room and half in the kitchen, completed the demolition of the wall as his heavy wrecking ball stomach pulverized whatever remained in the way. The rottie was closer in size to a midsize SUV than a fit rottie at this point.

As Gage was getting into emptying his balls, the cum factories that Kal possessed could hold no more, and with a mighty roar, Kal's orgams struck him. And with nothing to contain his load, shot after shot, barrels of cum a second, were spewed out, a geyser of cum that never seemed to end. Where Gage has been excessively abundant, Kal was extensively, liberally, aboundingly overproductive. Within moments, cum not only began to pool around the fornicators and washed away the rubble of their escapade, the level of liquid was quickly rising, sending miniature tidal waves racing through the house, seeping under doors into every corner of the house it could reach. Even as it filled every square inche of floor available, Kal's production continued to build up: starting at Gage's foot, and quickly climbing up the panther's ankle and shin to his knees. The few doors inside the housethat were closed couldn't withstand the heavy, viscous fluid, and with a few cracks of wood and metal giving way, flooded the bathroom, pantries, bedrooms and closets. And it still continued rising.

Had anyone walked outside the house at this point, they would have heard the creaking and groaning of wood and cement, the loud booms of roars and growls, the crack of support beams. Looking in the front window, they would have seen a mass of black, making it look like the house was shrouded in darkness even though it was the middle of the day.

If they waited longer, they would have saw a thick white cream crawling up the large picture window. Outside observers wouldn't really have been able to figure out what it was. Where they painting windows? Did a washing machine break and the house was filling up with soap suds? Why was it starting to leak around the windows and outside door? Where did the hole in the wall under the picture window that was letting out trickles of the fluid out come from? And why did it smell so... musky?

But if they waited too long, trying to ponder the mystery, they would have had their suspicions answered in a dramatic, confusing way, as the outside door, stronger than anything inside before it, finally swung open, and a massive wave of tiger and panther cum quickly washed down the steps and sidewalk and into the street, spreading for hundreds of feet, soaking everything and knocking people, fences, small trees and cars from where they stood.

Only one person watching what was happening stood solid against the tide. A red and black stag with two impressive antlers, wearing a suit that did little to hide his muscled body or large bulge in his pants, with golden earings and nose loop, and pitch black sunglasses.

"Well, that was more than expected," the deer said with a smile, with a deep, rumbling, otherworldly voice. "But we can improve on that."

Inside the house, lay three exhausted, sweaty, panting and moaning furs. Cen was little more than a water balloon of spunk, his ruined ass draining out all of the fluids his body struggled to hold. Gage had flopped backwards into the ocean of cum, his massive dick still spasming, forcing out seed and fluid. Kal was still where he was, the high water mark of his cum reaching to his neck before it all found a release. And his busted pipe continued to send geyser's of cum into the manmade lake the three had made.

Kal groaned, trying to lift an arm up to point a finger at Gage. "Next time... let's not do this in the house."

Gage gave a rumble of an answer, followed by a snore. Kal joined him in napping moments after.

Cen tried roll himself onto his feet, but the heavy sloshing in his gut made it difficult to do so. He then tried to look behind him.

"Uh... guys? Are you still there? Guys?"

Two loud snores gave Cen his answer.

Cen groaned. "Well, I'll just... wait here, I guess."