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If Krypto knew what pink kryptonite was capable of, he would've never gone near it in the first place.

His entire world had shifted in the blink of an eye. Formerly digitigrade like all of Earth's canines, he now stood on his two hindlegs, though doing so felt foreign to him and he stumbled a bit as he got used to his new stance. The act of doing so was tougher than he imagined thanks to his shifted centre of gravity.

Everything his body told his mind was wrong, at least it would've been had he still been standing tall on all fours. The way his trunk was shaped, how his limbs attached to his torso, how his paws changed--

He gasped. His paws - or what used to be them - were entirely different now, not unlike what human hands and feet were like. There were wiggling monstrosities attached to his appendages, moving in ways that agitated his brain, and it took him a hot second to understand how to innately operate them. Gone were the days of being able to plod along on four, perfect feet.

The ability to grab things now was weird. He gave himself a few quick tests by feeling his face, the mental map of his body updating with every deliberate touch of himself. All the things he ever saw about himself in a mirror were present and it had him amazed. This was normal for the humans?

Even something as simple as digging his toes into the dirt was alien in sensation, as was having toes at all. He didn't need to use his whole foot anymore as the big toes he now sported were more than capable for the job. The whole structure of his foot was bizarre in its construction, with his new heels being another stumbling block to overcome. How those hairless monkeys managed to stay upright with such ridiculous anatomy he'd never know.

In his self-exploration he discovered the extent of the changes to the rest of his body, the tips of his fingers trailing over a body he'd never known before. Being a superhero he had a bit of a naturally athletic body that normally went unnoticed as a dog, but now standing upright it was open for the world to see, already more impressive than the vast majority of humans he'd ever seen. He might not be anywhere on the level of Superman - who was, really? - but clearly whatever work he'd inadvertently put into himself paid off.

But being able to feel that body for himself was a whole other story. The definition he possessed was lean, allowing his fingers to contour over the ridges between his muscles. Everywhere he caressed was the same; whether it was his chest, his arms, or his abs, it was all firm to the touch both at rest and when he learned how to flex them.

His eyes bulged out wide when his hands eventually discovered his ass - supposed to be flat and flush with his hindlegs, but now rounded out with some solid heft to it. The amount of time he'd spent around humans had led him to understand the area was one of particular importance to them, and could now comprehend why for himself. A faint rosy blush crept onto his face as his cheeks tensed from contact, knowing that those people focused on them because of how nice they felt in their grasp. He was inclined to agree.

What he didn't realize, however, was how much he enjoyed the sensation. On the opposite side of his pelvis was his pride and joy - his bone, hard as a rock - only he just noticed the shape had changed along with the rest of him. The features he'd come to recognize about himself were gone, leaving behind a shaft smooth from base to tip, only to bunch up near the top into this unusual mushroom-like form. Where was his sheath or his knot? How did this happen?

The answer to all of Krypto's questions and more would've been obvious had he paid attention to his surroundings. Completely blind to where he stepped thanks to a lack of self-awareness, he laid a foot next to the hunk of pink kryptonite that started his freakish transformation in the first place. He paid it no mind, of course, as the sensations coming from the erogenous zones on his altered form kept his rapt attention. It let the rock get to work.

With his hand on his chest as tried to take in everything happening to him, he didn't see the glow coming from the stone behind him. That had him caught off-guard when the slightly rounded muscle under his fingers suddenly twitched without warning and flexed bigger than it had, only to retain the size at rest. The other pectoral followed suit to match its pair, then repeated the process to swell even bigger. What was going on?!

His arms kept up with the growth of his chest, though the sensation of them spasming jerked them out in front of his face where he could see them. That let him observe the bulk on each limb surge dramatically as densely-packed muscle mass piled on in every direction. Biceps that were merely visible before now pumped out into mounds the size of baseballs, while triceps that used to be slightly raised developed into hills of beef that arched the bigger they got. It took no time at all for his arms to resemble what they could look like when he willed himself into being strong.

Like his chest, his back benefited from the random burst of growth occurring to him. While it wasn't necessarily flat to start off with, he could feel the heft bloat every time his shoulder blades moved, the musculature he had no chance of seeing then or now growing steadily bigger with each passing second. Traps and lats - muscles he didn't think any dog would've heard of before - bloated out in their respective directions, adding inches to various measurements as they flared dramatically.

His free hand shot back to his cock, which he also discovered had gotten larger along with the rest of him. But how was that possible? That doesn't happen to people! He racked his brain for a plausible answer, only to conclude that there really wasn't one as him getting huge anywhere didn't make a lick of sense in his mind.

He had to stifle a grunt as the contact of his fingers on his twitching fuckflesh had his breathing momentarily hasten. Normally it simply slapped against his rigid core when he was in the mood as the position of it didn't allow for much motion, which made it all the weirder to see it succumb to the forces of gravity and rest in the air, now jutting out from his crotch. The pair of orbs that supplied his footlong meatlog with virile dogbatter hung lower than he was used to, also fattened up from whatever wanted him bigger. That part of him in particular had him wondering if he really should be panicking over this or not.

While there was no need for them to join in on the fun due to his ability to fly, that didn't stop his legs from absorbing whatever essence was being pumped into him and thickening in sync with his other limbs. Already holding the minimal fat required to be healthy, his quads positively ballooned in size as they tensed themselves bigger, rubbing against the other until he realized he had to adjust his stance. The feeling of which wasn't as bad as he thought it might've been, especially when his plump balls brushed past them.

His hands were busy with every part of his body except for his ass, which he only just remembered about when he noticed his tail whipping against the mounds of beef. A quick grope of his glutes had them flex in the palm of his hand, huffing in surprise when the dimpled bulk filled it completely and then some. Sensations he'd never thought about as a feral now were the only things he could focus on.

It was all so much! Krypto's eyes bugged out from the abrupt addition of heft, his fingers twitching as he attempted to not touch himself too desperately. The sight that lay out before him got his mind racing. He looked like... like...

He looked like Superman if the Man of Steel was a dog, but truth be told he didn't hate how that sounded. Actually, he kinda liked it.

The Kryptonian was a hero in the eyes of the general public, so why wouldn't someone want to be compared to the caped crusader? He had a cape of his own, and while the collar was unique to him, the tag bore the same symbol as the man who shared a home planet with him. Yeah, save for the distinctly canine features he sported and the fluffy white fur that covered his body from head to toe, he might as well have been the spitting image of the superhero! The thought had his tail wagging in glee.

Measuring up to his owner had his heart abuzz with excitement, stepping away from the pink Kryptonite that he'd completely forgotten about by that point. Having this kind of size on his regular dog form wasn't something he could easily picture in his head, but being able to see all that beef on his body put the query out of his mind entirely - there wasn't any comparison between him then and now.

Taking a deep breath of air forced his chest to puff out, shooting it well into view and eliciting a scoff of approval at the remarkable size it'd grown to. So thick with beef it'd become that even one was too much muscle for a single hand to hold; he tried, of course. But feeling himself up like that brought upon stronger emotions than he anticipated, ones he felt as a feral, but something about them had changed. They were stronger now, as if corresponding with the tremendous increase in his size.

Scratch every doubt he had about the whole thing before - he fucking loved this!

His arousal blossomed tenfold faster than it ever did before, the sensation of his musculature forming rigid curves that he couldn't fully grasp causing him to groan in delight. His girthy pole struck his shredded core with a flex of his pelvis, leaving an impact of precum that matted the fur on his abs. The bricks of bulk on his trunk appeared to be cut from the finest of white marble, only for every breath he took displaying how they were real the whole time.

Every which way he turned to look at his enormity had his cape behind him, acting like a beacon to draw attention his way were anyone else around. A part of him almost wished there was someone there to witness him.

Bringing his arms against his sides showed how both parts of him burgeoned sumptuously from his unexpected expansion. The act of his limbs resting parallel to his trunk was an impossibility, now having to bow out as biceps as big as his head were forced away from his torso because of the lack of space available. Forcing it didn't accomplish much of anything except make him even hornier.

His spiking libido caused his heart beat to be felt through the veins snaking along his doghood, the throbbing flesh undulating in his grasp and forcing a low moan to escape past his lips. Stroking his crotch rocket from base to tip caused a shiver to rip up his spine, his broad musculature tensing as a result. Every pleasurable caress of his fingertips sent electric bliss rocketing through his nerves. Shit, he should've figured this out ages ago.

One hand finding purchase on a meaty pec while the other jerks off his dick, he groaned as the feeling of arousal ignited in his soul, burning brighter than he'd ever felt in his life and not wanting him to stop for anything. His fat balls crashed against his bulky thighs as he pumped his cock with wild abandon, his animalistic instincts guiding his actions and letting his inner beast loose. Every panting breath had his prodigious chest heaving as a result.

Hand coated with leaking pre, Krypto huffed as the pace of his masturbating far exceeded regular Earthly speeds, his super agility stroking his cock faster than a human could comprehend, even if he felt no difference. The only thing that mattered to him now was getting off, the stimulation from his bulky form twisting his face into a pleased grin that let his broad, canine tongue loll past his teeth. Just about the only thing that could make this any better would be burying his bone into someone else, but this worked just fine for him.

With the pressure in his lower half building rapidly, his dense musculature began to twitch from the nearing of his climax and got him to let loose a gasp that had him marginally double over. Every part of his beefy body flexed as he practically fucked his hand. The need to cum hit him harder than it ever had before.

And just like that he pushed himself over the edge, his productive balls pulling up to his crotch and expelling his potent seed. His cumpipe bulged in his grasp as he shot his load out on the grass in front of him, not caring where his output landed. So much creamy spunk painted the greenery white that it almost appeared like an army of men were behind the spontaneous shower of cum. Apparently his super genetics blessed him with more surprises than he initially realized.

It was the first time blasting rope as a muscled hunk, and right away he knew it was the best he'd ever had. He couldn't believe how incredible that was! Was that normal for other Kryptonians his size? He knew he'd likely never get a chance to verify, but the thought got a chuckle out of him.

Unbeknownst to the Labrador, Ace the Bat-Hound had picked up the sounds of his orgasm, initially thinking something was wrong before stumbling onto the real cause... which he still thought was wrong. He couldn't make heads or tails of the sight before him as the grotesque visage of the musclebound mutt that his friend became didn't process in his brain at all.

Besides the unexpected spectacle of a dog the size and shape of a human was the pink kryptonite, the faint glow drawing his attention and getting him to inspect the mysterious rock. Well, it wasn't entirely pink as something white appeared to coat part of the stone which... had a particularly strong odour that he couldn't place at first, until he did. It had him groan in disgust.

That was until the glow of the rock intensified, his eyes going wide from the abrupt change in brightness. What was this thing, and what did the light signify?

The answer came almost as quickly as the question did. In a matter of seconds the energy held within the pink kryptonite radiated into him, affecting his DNA at the molecular level by shifting his form without him understanding him. His paws were the first thing he noticed, unused to their new shape and sliding to the ground as he lost his balance when his limbs lengthened completely out of his control. The impact of his fall caused him to grunt loud enough to alert the other dog to his presence.

Krypto snapped out of his daydreaming when he heard of another in the vicinity, only for his face to light up when he saw the cowled German Shepherd undergo the same changes he did. He never had a chance to witness them for himself when they happened as he was far too shocked to take it all in. This time, however, he wasn't about to miss the alterations for the world.

With a wry smirk stretching to one ear he watched the other canine stumble as the human features he'd come to acclimate to came into existence. Every twitch of his companion's body brought about a new change that he recognized on himself, knowing the end result wasn't as difficult to manage as what the Bat-Hound was making it appear to be. It wouldn't be soon before long that the first part of the transformation concluded and the real fun began.

Ace gulped as his unmistakably canine assets morphed into ones he'd only seen on humans before, his eyes darting across his body as he pushed himself to his hands and knees. His gaze immediately shot up to the doggy beefcake standing in front of him and he panicked. "Krypto, what is all this?!" His gruff voice tinged with fear.

"Relax, Ace, it's not that bad," Krypto assured the shaken GSD. "You're still gonna be you after all this is done, it's just that you'll kinda also be somewhat like your own--" He froze, remembering the other dog's annoyance at using the wrong terminology. "Partner! Yes, you'll resemble your partner when this is said and done."

Ace just scowled in response. "It'd be nice if I had a choice in the matter."

"Well, that's clearly not happening," Krypto gestured with his hands, inadvertently showing off his sculpted beef, "so the best thing to do right now is make the best of it. Trust me, I think you might enjoy what comes next."

"I don't..." Ace grunted, closing his fists for the first time as he adjusted to the sensation of having them in the first place. "I don't know what you're getting at here." As if actually trying to answer his question, the hunk of pink kryptonite pulsed even more energy in him, catching him by surprise as he saw musculature he didn't realize he had starting to twitch and swell before his very eyes. He now understood why the Superdog looked the way he did.

The intense feeling had him arching his back, the muscle mass there uncontrollably flexing as it billowed with additional heft. The delineation of the different muscles began to be apparent the more size was forced under his gray-furred pelt, broadening him in whichever direction they grew in and touching whenever he rolled his shoulders.

Every deep breath puffed out his chest, only it didn't return to the size it started at, instead looking as if it was getting inflated by the air he inhaled even though that was impossible for him to do so. An errant grope of a hand told him it wasn't his imagination. How was that even possible? No one could grow like that so quickly!

His shoulders rounded into veritable cannonballs not unlike the various superheroes he'd seen stopping crime in his years, now comprehending just how huge they were to have muscles the size they did. It'd barely been a few minutes and he'd already surpassed double the width he used to have as a feral.

If his arms were shaky before, he might not have much trouble keeping stable now as they burgeoned with brawn that he didn't think someone like him was capable of achieving, supporting his weight far easier when he grew biceps as large as his head. The bizarre metamorphosis into the embodiment of physical prowess had the gears in his head spinning wildly as to if being a canine Adonis was a good thing for his job or not. He could still fight crime like this, right?

The growth traveled down his body, tightening everything about his core and popping out abs that dogs weren't known to have until that very day. His hand rushed to his trunk before he felt the energy bloat his thighs enormous with solid muscle mass; he had to stifle a moan when they involuntarily brushed past one another. The good feelings continued as his calves hardened into teardrop shapes that only the bulkiest of humans seemed to achieve. Whatever he imagined his day would've been like seemed as if he dreamt it up in a wholly different lifetime now.

A low, long moan rumbled in his throat as his hands darted to his ample rear, feeling his glutes inflate themselves bigger as the seconds ticked on, giving him a posterior only acquired after years of dedicated exercise. So thick in his fingers were the mounds that he couldn't believe that kind of mass belonged to him now. He, uh, almost didn't hate it.

But the pleasurable sensation caused by groping his own cheeks brought about another change that he never anticipated - his endowment had swelled huger. Not only that, but it wasn't what it used to be, now being some weirdly cylindrical meatstick that he'd never seen before in his life. Just about the only thing he didn't think was off was the sheer size of the turgid pole, longer than hand and thicker than a pop can. And the plump set of testosterone factories backing them up were pretty awesome too.

The overwhelming sensation of expansion had Ace beside himself in a flurry of different emotions, stumbling backwards thanks to his lack of experience in being top-heavy, unintentionally distancing himself from the source of his growth. It was so much to take in! Pecs as big as his whole chest used to be heaved with every alarmed breath he took, the rising and falling hills of beef solid to the touch and incredibly him. His brain offered no solution as to why this even happened in the first place.

"W-What happened to me? Am I stuck like this?"

"As far as I can tell, yeah, we are. But don't sweat it!" Krypto reached out his hand to the German Shepherd and pulled the musclebound mutt up, now standing eye level with his friend and liking what he saw. "You look great, trust me."

Ace's ears flattened at the juxtaposition of what he felt versus what the Labrador told him. "You don't think all this is a bit gratuitous?"

"I mean, probably." The fact that he'd grown bigger than other superheroes felt like a tad much to Krypto in some aspects, though he didn't think that was much of an issue in the long run. "I don't exactly need this kind of size to be strong, but I kinda like how I look the part now."

Ace instead grew more flustered the longer he dwelled on his newfound size, unable to look past the dramatic increase in all his measurements that would make his job that much more of a struggle. "I'm going to have to readjust the calibrations for all my gear since that stuff was attuned to my previous weight. This is going to take ages and--"

"Hey, worry about that later. Just relax!" Krypto offered the agitated dog a friendly rub on the shoulder, though not above giving it a hardy feel at the same time. "Believe me, this is a good look for you. You wear the size well."

"Uh..." Ace blushed at the compliment. "Well, I... you know..."

"You're still overthinking it, huh?" Krypto could only laugh at the other canine's nervous energy. "Go on and tell me you don't enjoy looking like a canine version of your partner. You've got a back that makes your cape look small, plus arms that can take out bad guys with only a single punch!"

Ace gulped, his lips pursing. "His, uh, aren't quite this big actually."

"Isn't that cool though?"

"Erm..." The contrast between his reaction to his abrupt transformation and the way his companion responded to it had Ace like a mixed-up bag of emotions. Every rational part of him wanted to ask all the questions it could about why this occurred and how it would serve him, but the carnal side of him was more focused on the intense feelings of euphoria induced by his overly sensitive beef. Merely caressing his bulk lifted his mood slightly! "I... guess?"

Krypto's face lit up when he heard the Bat-Hound start to agree with his position. "That's the spirit, buddy! You still got your smarts, but you also got this rocking body to go along with it."

Ace blushed profusely. "Krypto, I--"

"Hey, I'm only saying what you're telling me." As if to demonstrate his point, Krypto drew the GSD's attention downward, parading his friend's erect cock dribbling seed in rivulets down the length. "I don't think you're as upset about this as you want me to believe."

That was the moment where Ace realized his body acted of its own accord, his fingers twitching in trepidation as he huffed in alarm. He didn't know what to do. His modus operandi had always been to stealthily catch his foes by surprise, but it worried him that he'd be heard lumbering up to them a mile away now. And yet deep down he couldn't prevent himself from hating the changes he'd received, and it left him feeling overall conflicted. "Well, I--"

Krypto countered the other superhero's concern with a quick kiss, hoping to disarm the GSD's worry by wordlessly expressing that any alterations weren't being experienced alone. All he needed to feel was the tension in his friend's body lessen and he knew it was time to pull back. "Feeling better yet?"

"A bit," Ace huffed, his expression messily contorted from conflicting emotions, "yeah. Thanks for that."

"No problem!" Krypto could still innately sense the other canine's stress with only a single glance of his companion, and it only took half a second to come up with a sure-fire solution to get the Bat-Hound to calm down. "Hey Ace, could you do something for me?"

"What's that?"

Without so much as a warning, Krypto grabbed the other dog's hands and forced them against his pecs, flexing them and showing off the bulk stuffed under his hide. "Tell me what you think of my chest!"

The sensation of the Labrador's meaty pectorals in each of his hands had Ace even more flustered than before, several vocalizations spat out before something audible came through. "Krypto!" He blurted out, his fingers trembling on all that white-furred beef.

"Yes?" Krypto's smile couldn't have been more mischievous if he tried.

The normally emotionless superhero that was Ace was anything but, genuinely enjoying the feeling of his friend's size in his grasp, so much so that precum continued to ooze from the head of his dick at a quicker rate. "It's... yeah, I kinda like it."

"Only kinda?" With a smirk, Krypto pushed forward, now sandwiching the other canine's hands between their chest boulders and eliciting a cute yelp of surprise from the German Shepherd. The tips of their throbbing poles touched and told him everything he needed to know.

"Okay, okay, I like it a lot!" The admission had Ace's usually gruff demeanour saturated with embarrassed need. Try as he might, he couldn't fight his true feelings, not only for the muscle mass they'd both attained but also for his companion as well. "Yeah, it feels good."

"Good to hear, because I think yours feels great too." Krypto kept up his plan by letting his own fingers trail along the other dog's thick trunk, savouring the sensation of contouring around his friend's muscles as he worked his way from front to back. "Seems like you enjoy me doing this."

As much as Ace wanted to protest, feeling the grope his dimpled glutes had him panting up a storm that wouldn't quell so long as his cheeks were played with. "It's hard not to, you know what you're doing somehow!"

"I'm a fast learner," Krypto chuckled. It was then that he saw the other canine's pulsating spire, bobbing in the air as electric shockwaves from his fondling forced his companion's pelvis to flex. That put an idea in his head, one punctuated by a lascivious grin. "Hey, why don't I help you out with this thing, hmm?"

Ace didn't understand what the other superhero meant at first, only to gasp when he felt his veiny schlong be unceremoniously grabbed by his friend. The instantaneous pulse of pleasure received ripped a shiver up his spine as he shuddered. "Krypto..."

While Krypto thought he'd be doing the GSD a good thing by tending to the needs clearly burning in those loins, he wasn't about to go through with something the both of them weren't fully on board with. What kind of superhero would he be if he did that? He'd be no better than the villains! "Hey, in a show of good faith, I'll only proceed if you want me to."

The ball was squarely in Ace's court now, his mind torn between wanting to thoroughly process the changes made to his body and wanting to enjoy the carnal delights of this sort of physique for himself. It took much mental deliberation, but in the end the obvious choice won out. "Do it."

"You got it, pal!" Not needing to be told twice, Krypto loosened his grip into a gentle tug that stroked along the other canine's leaking fleshpole. Even without being huge he could tell the Bat-Hound hadn't gotten off in quite some time now. The amount of twitching he felt from such simple actions told him immediately the quivering dog wasn't about to last long, but that resolved him to make it something neither of them would forget.

Slowly, but surely, he bobbed his hand along the other superhero's tumescent crotch rocket, enjoying the fruits of his labour be rewarded with moans of approval from his friend. Every stroke was deliberate in both speed and intensity. He made sure to stimulate both base and tip, incorporating every part of the other canine's magnum dong to fully enhance the experience.

He also got the idea to play with his companion's plump balls, his free hand exploring the area and feeling those fattened nuts for himself. It was the one area that the German Shepherd easily competed with him on as, even now, these seemed a tad bit bigger than his, which fueled his own excitement at the prospect of seeing the other dog erupt in a fit of passion. He seemed more excited for this than the Bat-Hound did!

Working over the underside of his friend's pelvis, Krypto didn't have to see the GSD's face to know he was doing a good job. Every huff and puff, every moan, the buckling of the other canine's limbs - all of that was a result of his careful ministrations, the pressure applied to the most sensitive parts of the hunky superhero's body. He thrummed his thumb over the other dog's taint and heard a gasp in return, one that he felt resonate when a thick glob of preseed belched forth all over his hand. That brought a smile to his face; it wouldn't be long now.

Ace was no stranger to having his doghood be taken care of by others, but never before had he been manhandled so thoroughly by someone with actual hands. The intricate motions of those fingers hit him harder than another person's mouth was able to, coaxing out needy moans as his own hands gripped at his heavy bulk. His muscles tensed from the unrelenting ecstasy coursing through his system and had him all but begging for release.

One hand found purchase on a fat nipple, forced to point down thanks to the beef forcing his pectorals to protrude out from his chest. The additional stimulation rocked his body harder than anything else had previously and nearly dropped him to his knees. He let out another long moan, this one louder than the others and signifying he was right on the heels of climax.

That was it; he couldn't handle anymore attention.

His voice silenced by overpowering pleasure, his pelvis tightened as thrusted his shaft into the other dog's rough hand, achingly-hard orbs jettisoning out everything they produced. He sprayed his juices all over the grass in front of him, coating several dozen blades in his virile cum as he shot rope after sticky rope from his bulging cumpipe. There wasn't any other time that could match what he just went through.

A few strands of jizz landed on Krypto's burly body, which he had no issue cleaning up after. The taste of the other canine's ejaculate had him intrigued in that the flavour was far different than what he thought it'd be, now far stronger and much more masculine. It enticed him to get a taste right from the source.

Not giving the Bat-Hound an indication of his intentions, he let his tongue guide him along the GSD's flagging length, taking in the delectable taste of the creamy output that flowed down the other canine's rod. He moaned himself from simply ingesting whatever he could get his mouth around. A few moments of careful bathing with his tongue polished his friend's member to a spit-shine, one emphasized by the string of saliva that connected the mushroom head of that obelisk to his tongue.

"Krypto," Ace moaned his companion's name as his hog had been so exhaustively cleaned.

Krypto wiped his mouth, a grin worming its way across his face. "And? How'd you find that?"

"I liked it," Ace seemed almost embarrassed to admit that. "I really liked it."

"I told you it was good! Maybe you'll listen to your old pal more often, huh?" The bashful nature of the usually stoic German Shepherd had Krypto snickering. It was nice that he got his friend out of that impossibly thick shell that'd been built up over many years of working with the Batman, but he couldn't have believed that this was the way he'd accomplish that.

But that's when something hit him like a ton of bricks. Both of them went from being their regular feral selves to canine Adonises in what felt like a blink of an eye, with the changes happening without their input. Seeing the other dog go through the same transformation he did had him wondering what the cause could've been, and it was only when Krypto thought back to nearly an hour ago that he realized the reason behind it all - the pink kryptonite. It had to be!

No other possible explanation existed for their unexpected metamorphosis. He knew the hunk of space rock was responsible for him gaining a plantigrade form, but it must also have been the thing that granted him size beyond his wildest dreams. Wait, where was it...

"So what is this thing, exactly?" Ace twisted his thick neck over to the Labrador, holding the kryptonite in his hands.

"That's the reason we're huge in the first place," Krypto padded over to his friend, grabbing both the other canine's hand and the stone as a playful smile took over his face, "and the ticket to getting even bigger."

Ace's eyes nearly bugged out of their sockets. "You... you want to?"

"It's what happens when you make contact with the rock, Ace." Krypto's chuckling punctuated the surge in energy that the pair of mutts felt well within them, the energy that drained from them returning with a vengeance as their bodies welcomed the growth they instinctively knew was coming.

Within seconds they saw the first signs of the pink kryptonite's power as their arms bulged dramatically before bloating past what they initially thought was their limit. Biceps bigger than their heads at rest were impressive on their own, but they paled in comparison to triceps that dwarfed the size of the average person's arms entirely. Thicker than steel cables and doubly as strong, their limbs absorbed whatever the stone offered them, flexing in appreciation as they admired the visible split peaks formed as a result.

Their chests were no different as the pectorals they'd come to love practically inflated as if sucking in lungfuls of air, only they kept going and encroached on their view of the world in front of them. While they weren't able to hold one of those chest boulders in a single hand before, not even two were enough this time around as densely-packed beef piled onto their frames at a rapid rate. They both let their tongue loll out the sides of their mouths as they felt both theirs and the other dog's bulk, reveling in the firmness that their fingers couldn't press into no matter how hard they tried.

The capes they both sported now seemed comically small as what was the perfect length for medium-sized feral dogs was paltry compared to the immensity they both now commanded. Muscles that used to be relatively flat were now anything but, curving out as beef stuffed them and making them take on an imposing stature unknown to the human populace.

Wide before, their lats billowed out into thick plates of heft that broadened their trunks out immensely, giving the other man something to grope and admire while they grew. The same was said of their traps in how they gradually swallowed more and more of their neck to the point that a line of muscle mass connected the bottom of their head and their meaty shoulders. Even with all that bulk stretching them out, their collars remained stretchy enough to withstand the mounting pressure applied to them, much to their delight.

Their legs followed the example set by their arms, swelling out as thick as watermelons as their quads mashed against the other, forcing them to adjust their stances in order to accommodate the beef piling onto their frames. The expansion then traveled to their glutes where the mounds they had before evolved into globular hills that would take someone several moments to fully explore. They might just do that soon enough.

But all the pleasurable sensations pummeling their engorged forms induced their throbbing shafts to full mast once more, now thickening up well beyond what they used to be to make them so much more. Their spires slithered up their manly torsos, pre coating their cobblestone abs, just about tacking on another foot of length and bloating them out to the size of two-litre bottles. Not even two hands were enough to fully grip them now!

The enjoyment generated by the pink kryptonite could've lasted them however long they wanted it to, but their fun was unfortunately cut short when a sudden development took place in their closed hands, prompting them to make a horrifying discovery - the stone had disintegrated into dust.

Ace's jaw just about dropped to the floor. "What did you do?!"

"What do you mean, 'what did I do?' I didn't do anything!" Krypto protested.

"Did we use up all its power or something?"

"If that's even possible, I wouldn't know," Krypto observed the dust in his hand, a light breeze enough to blow the spent rock into the air before he dumped the rest on the ground. "Shame, though."

While Ace was perturbed that the one kryptonite he came to appreciate apparently was capable of expiration, he couldn't help but notice everything he got out of it while he held it. "Well, at least it did what we wanted it to," he grinned, clutching his heavy chest in his hands.

"And more!" Krypto's tail wagged excitedly behind him, whipping his overmuscled ass cheeks as he gleefully inspected his monstrously handsome body. So much beef had been added to his frame that he couldn't exactly calculate the amount he'd gained in that short timeframe, but a rough estimate put him around the five-hundred-pound mark, with him thinking the GSD was in the same league. How his cock throbbed at the site of the behemoth that was the Bat-Hound. "Remember how I said you made that size look good? Seems that's the case no matter how big you get!"

A nervous gasp left Ace's mouth as he felt one of his prodigious pectorals be groped by his companion, though he couldn't have anticipated the other canine's broad tongue lap along the ridges formed by his impossible bulk. The sensation was sublime. He moaned in approval and did what he could to coax the Superdog to give him more. "You're good at that. P-Please--"

"More?" Krypto took the words out of the other dog's mouth, already knowing what his friend wanted. Putting more effort into it he tongued along the whole of the German Shepherd's chest, tasting the manly essence that got unearthed from that gray-furred pelt. He grew insatiable with his need to experience the other man's flavour, soon discovering the scent paired with it was just as, if not more, intoxicating. His nose then took over.

He let his nostrils whuff over the other canine's musky beef, his enhanced olfactory sense picking up where the aroma was strongest. The Bat-Hound had no issue letting him wander around that swollen physique, which suited him just fine when his nose landed in the other dog's bushy pit, drinking in the masculinity practically pouring from it. He pressed his muzzle in as far as it could go, moaning as he dug whatever amount of the exhilarating stench he could with both his nose and tongue going at it. He had no idea if that felt as good to him as his companion, but judging by the way they appeared to produce a symphony of moans it seemed like he had his answer.

Ace was beside himself in erotic bliss as he let the Superdog have his way with his bloated form, not expecting his scent to be so heady and exciting, but also not surprised a canine with a superpowered nose took interest. Truth be told his smell was getting to him too, so he knew right away how amazing it must be up close like that.

Krypto became far needier than he thought as he lashed through the musky fur, his need for the other man skyrocketing. "Oh, Ace..." He groaned, his shaft poking the GSD in the leg. All that manly smell imprinted on his brain and caused him to spurt translucent pre all over the ground. His urges were growing too strong to ignore, and had to be dealt with posthaste. Then he got a brilliant idea. "Hey, Ace."

Hearing his name snapped Ace out of his lust-drunk trance. "Hmm?"

Without warning, Krypto wrapped his bulging arms around the other canine's thick trunk, an impish twinkle in his eye. "Ruff, ruff, and away!" In the span of a few seconds the pair of dogs weren't anywhere near the ground, and while he had no issue with the fact, his friend didn't see things the same way.

"Krypto!" Ace shrieked. "You could've told me you wanted to fly!" His raspy voice wavered from the sudden departure.

"And what fun would that be?" Krypto snickered. "Besides, you've flown before, and I'm not doing this for no reason. In fact," Krypto - now situated behind the GSD - reached around and gingerly grabbed onto the other superhero's fat cock, giving it a slight squeeze that had the Bat-Hound moaning, "I think you'd actually appreciate something different. Trust me, it's a lot of fun!"

While Ace couldn't be certain of how he felt given his mind swirled with what felt like hundreds of varying emotions at once, being able to deny his feelings of arousal for the situation was an impossibility given how diamond-hard his schlong had gotten and how much his basketball-sized cum tanks continuously drooled slimy precum with every second that passed. He didn't hate being in the air at all, especially with the Labrador's incomparably strong arm holding him firm against that enlarged torso. "Alright," he took a deep breath, his tremendous chest pressing against the other dog's meaty forearm, "I believe you."

"Attaboy!" Krypto would never lie to his friends, especially about something they weren't intimately familiar with. But to be soaring above Metropolis with the wind at his back was something he wished he could share with others on a regular basis. To do so as a canine behemoth only made the experience that much better.

Trying to prepare the GSD with only one hand proved to be a daunting task, but one he was ready for. Those buns of steel felt incredible in his grasp, with both he and his companion appreciating the squeeze his free hand gave them, but knew his goal was parting them so that his monolithic prick could slip between them, that being easier said than done considering its formidable girth. That wasn't anything the other canine colossi couldn't handle!

With a little effort he managed to fit the head of his python between the other dog's hypermuscled glutes, the pressure applied by those slabs of beef driving him wild. Nevertheless he persisted, having to use his hand to make his salami contact the GSD's winking pucker and slather his oozing pre all over the area to ensure everything went smoothly.

So much attention was paid that eventually his cock slipped right in, stretching that tailhole wide to accept everything he wanted to give to his friend. It evoked an embarrassingly whorish moan from the Bat-Hound, causing him to blush from the times he'd had that happen to him.

But his efforts weren't for naught as the super lubricating capabilities of his preseed allowed for his meaty schlong to fit in without trying. The sensation got him to groan in relief into the other canine's titanic trap at finally being balls deep in someone else again, while the German Shepherd grunted from being filled so suddenly. It paid to have powers.

Ace couldn't fathom how swimmingly everything had gone so far, with nary an ounce of pain to be felt from being impaled on what had to have been the biggest, thickest tool a person wielded, only pleasure coursing through his body as he became used to the sensation. He couldn't stop a goofy grin from contorting his mouth the more he grew accustomed to the feeling of being stuffed, his tongue lazily falling to one side of his mouth.

And that's when the Superdog thrusted for the first time. Going from merely being penetrated to full-on pistoned into was a sensation that he couldn't have prepared for, but one he welcomed with open arms when the euphoria brought on by his tight inner walls clamping down on his friend's swollen shaft radiated from his muscly ass to the rest of him.

He let the Labrador take the lead as, being that far above the ground, there wasn't anything he could do to influence the lovemaking they'd started. That being said he wasn't about to do nothing, instead trying to manipulate his stretching asshole in whatever way he could to induce pleasure in the other dog. Even clenching his anal cavity a tiny amount paid dividends as there was nothing comparable to this that the alien canine could encounter.

Feeling his leviathan spire be squeezed as if in a fleshy vise had Krypto gritting his teeth, but not stopping the anal onslaught he provided to the other superhero. His hips continued working like a machine as he pumped his veiny cock into his companion's hungry hole, flattening the other man's prostate like a button wired directly to the pleasure centre of the brain and loosening the force applied to his mighty pillar.

So good fucking his friend felt that he wanted drill harder, using his other engorged arm to grip the Bat-Hound's waist, both limbs flexing as the sensation of orgasm loomed in the distance. Those dimpled glutes were the perfect cushion for his shredded pelvis to slam into as the impact only ignited their arousal even further, inflaming their souls with the need to breed and be bred respectively. His nose buried in the other canine's burly trap, he took in the GSD's masculine scent and used it to drive his bone home, spearing the other superhero like he'd never done to anyone before in his life.

Ace's limbs felt like jelly as every one of his buttons were mashed at once, any tension he might've felt at that moment thoroughly dissipated as the reaming he got melted away any trepidations that had built up. Just about the only things he still had control over at that point were his hands, with his fingers in particular wanting to feel whatever they could to further enhance his situation.

They landed on the other dog's rump, unable to travel much more than that thanks to the hundreds of pounds of sumptuous beef in the way, but that didn't stop him from kneading his friend's cheeks like he'd received back on the ground. The Superdog's rear was orgasmic in its enormity, feeling it tense from his touch and making him want more. He didn't even notice how much of an effect it was having on his companion.

While he knew the German Shepherd was overly sensitive due to all the bloated bulk, he didn't even stop to think that he'd be the same way, wondering how much more enhanced the sensation was given his various superpowers. He tried, and failed, to stifle a moan, succumbing to his friend's groping of his ass cheeks and causing him to slam his crotch rocket harder than he had been up to that point.

He huffed as his libido rose high along the mountain of release, the heat between his loins melting the snowy peak in record time and gradually pushing over the edge entirely. That came with a dramatic decline in the pace he'd maintained until he could only manage one last hump.

A loud cry burst forth from his throat, muffled by the other man's sweaty bulk, signifying his balls could withstand no more pressure and erupted in a fiery fit of passion. His engorged cock exploded into the awaiting hole of his companion, feeling his seed gush into the other dog and flood those innards like he'd never done before. He painted the inner walls he'd just fucked a pearlescent white as his arms held the other canine tightly. As good as he felt, he wondered what it was like for the recipient of his load.

To abruptly have his guts go from scrambled to deluged with potent dogbatter had Ace gasp in shock, which acted like a chain reaction that brought about his own orgasm. He moaned the Superdog's name as he let loose his flood, letting it geyser from his prodigious tool and blast through the air before landing on the grass dozens of feet below him.

It felt like heaven to be overwhelmed by the superpowered canine's cum, though there was another sensation making that happen as well. He didn't notice it at first, but he could've sworn his chest had crept into his view that much more, prompting him to get a better look.

Sure enough his suspicions were proven right when he saw his pecs grow before his eyes, which then translated to his arms blimping out that much more and his back pushing away from the Labrador saturating his body with super spunk. He let the expansion take place, encouraging it as best he could by clamping onto the other canine's turgid tool and milking it for all it was worth. He wanted every last drop he could get.

It took Krypto another few moments to understand something felt different as his flow began to taper off. As soon as his awareness came back to him he registered that something seemed different in their configuration, quickly figuring out it had nothing to do with him, meaning that something was up with the German Shepherd.

The difference was apparent when he finally opened his eyes to see there was more of the other dog to take in, surprised he didn't even perceive a change in his companion's musculature until literally that moment. He knew his strength was as powerful as he willed it to be, but to completely block out the other canine blimping up in his grasp? It genuinely saddened him that he missed it!

But what a sight it gave him! Removing his girthy schlong from the other superhero's abused tailhole showed how the increase in size didn't make it gape as much as he thought it should've, nor did the untold litres of cum pumped into the other man pour out as expected. That must've been it! While the essence of the pink kryptonite had been used up by the pair of them, somehow it affected him in such a way that he could still transmit the effects via his ejaculate. Score one for Krypton!

The descent back down to Earth was a smooth one, though Ace fumbled his footing when he realized he hadn't acclimated to his heavier weight yet. "Woah!"

"Easy there," Krypto offered support to the very top-heavy canine, a wry smile forming when he got to actually feel that swollen bulk for himself.

Every one of Ace's senses were on fire despite him having just fired his load, his body riled up as he took in his immensity. "Krypto, how did you do this?!"

"Apparently this old dog can learn new tricks!" Krypto laughed.

"Hey," Ace's voice took on his usual gruff tone, though with a hint of excitement throughout, "how long do you think this'll last?"

Krypto grimaced as he thought about it, though nothing concrete floated through his head. "That's tough to say. Normally kryptonite only affects me for a full twenty-four hours, but this stuff? I've never seen it before, so I have no clue."

"Then we ought to see how far we can take this!" Ace's enthusiasm belied his tremendous size, though he quickly realized the fact and tempered it down. "You know, for... science, and stuff."

While Krypto was obviously going to agree to the offer, another idea popped into the forefront of his mind, one that he saw as an even greater test of his newfound ability. "Actually, I might have something better in mind," he shot a playful wink at the Bat-Hound. "Just you wait and see!"