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”A resort?” Frank asked, incredulously. It wasn’t the kind of thing he, and probably not Cullen either, did regularly. “With a spa and everything? Where’d you get that idea?”

Cullen shrugged. “Got the offer at work. Doesn’t it sound nice, though? A week of just getting pampered, lounging in a pool, getting massages… and hey, look at this part,” the younger man replied, pulling up his phone and pointing at one of the resort’s rules.

“Public sex encouraged,” Franke read out. “Huh. Well, that’s new. Can’t say I’ve ever heard of a public sex resort either.”

“They say it’s meant to like, revitalize men especially. Based on some kind of new theory, apparently, that suggests we’re all hopeless horndogs and need sex,” Cullen laughed. “I dunno how true that is, but I mean, you are pretty needy sometimes.”

The two men had been in a relationship for a while. Originally it had been meant as a casual thing, a friendship with benefits, but subsequently they had mutually realized they wanted more. And here they were, now; two men, one Hispanic and the other Asian, living together and bored at the beginning of their summer vacation.

The original plan had been to do nothing. But now, Cullen had come up with this new idea, one that seemed like a more intense form of doing nothing.

“I mean, yeah, I feel better after sex,” Frank remarked in his snarkiest tone. “I was thinking it was more about the orgasms than some… spiritual need.”

“Oh come on, at least you’ll get to enjoy doing it in public,” Cullen laughed. “And you look like you could use a massage, too.”

“I could always use a massage, silly,” Frank rumbled, giving his partner a little shove. Normally, he wasn’t so playful and social, but Cullen brought out the best in him. “Okay, so what’s the catch?”

“The catch?” Cullen asked, looking like he didn’t quite understand what Frank meant.

The larger man stretched out in his seat with a demonstrative sigh.

“Well, the reservations were almost free, right?” he asked.

“Yep,” Cullen confirmed.

“And this is a luxury spa,” Frank continued.

“Seems like it from the website,” Cullen replied.

“So, what’s the catch? Places like that don’t have sales like that. They don’t give out free stays. Where do they get their money?” Frank asked, gesturing vaguely at nothing in particular. He got that from his parents, who were even more animated when arguing. “And don’t say it’s a marketing thing. We’re not the usual clientele either.”

“I mean, it is a marketing thing,” Cullen pleaded. “The description just says we have to consent to some health monitoring once we arrive. They want to figure out what health benefits a long, sexy vacation has on men like us!”

Frankie couldn’t help but look incredulous. Maybe a science project like that could exist, and maybe Cullen had figured out a way to get them into it, but it sounded far too good to be true, and in his experience, things that sounded too good to be true always were just that.

Then again, it wasn’t as if he couldn’t just leave if things got weird and they wanted to use him for an anatomy exhibit or something. The offer was very tempting; free food, relaxation, and sex already appealed to Frank more than almost anything, and that appeal only grew more with each year that passed.

“Okay, fine,” he said, and Cullen hugged him tightly. “J-just like, let’s keep an eye out for if they try anything weird- sheesh, you squeeze hard sometimes.”

Cullen was much stronger than he looked.

“Oh, yeah, of course. We’re not going to sign all our rights away or anything, or be on the hook for any extra costs. I’ll make sure of that,” Cullen replied with a cheer to his voice. “This going to be such a great vacation.”

Frank still wasn’t sure, but it wasn’t as if he had anything better to do. The offer just seemed deeply suspicious. But he’d see soon enough, he supposed. Worst case, he could just leave. The stay was almost free anyway, so all he’d lose was time, and all he’d gain was disappointment.

The two men packed their luggage. On a whim, Frank tossed a box of condoms and a bottle of lube, too. Just in case they really did have all this public sex, he wanted to be prepared for it. In other words, all he packed was the most important stuff: the condoms, lube, his phone, nand some clothes. Towels, he couldn’t imagine needing at a luxury resort… and that was, more or less, that.

They set off the same day. The resort was a few hours away, but the two were on vacation! They could do anything they wanted to, including set off randomly to get spoiled at an exclusive, mysterious spa.

The ride was uneventful. Long stretches of highway, a few sweet nothings or hollow comments on the news exchanged between the two. Apparently, some scientist somewhere had discovered a mutagen that worked on humans, to transform them into radically different shapes. It was still under research, and it’d be years before proper human testing could even begin.

“Huh, isn’t that something? I wonder what they could transform you into,” Cullen laughed. “What was it you wanted to be? Like, your favorite animal. A bull?”

“Yeah, just a regular bull,” Frank smiled, while keeping his eyes on the road. “Don’t think they’ve figured that out yet.”

“Hey, at least we’ll live to see where this one goes,” Cullen remarked. And it was true, to a degree that the smaller, younger man couldn’t possibly imagine when he said it. It was a deeply and intimately true prediction of the future.

Another quiet hour of driving later, they could see the enormous resort complex sprawling out below them, nestled in a picturesque valley, alongside a winding river. A little after that, they were already pulling into the parking lot, the hours they spent driving vanished from their memories in favor of the growing excitement about getting to properly relax.

If any of what the resort claimed to offer was true, anyway.

There were a surprising number of cars in the parking lot. A variety of brands ranging from cheap to excruciatingly expensive. It almost looked deliberate, as if the resort had sent offers to every stratum of society. Frank and Cullen fit comfortably somewhere in “middle class” and didn’t quite stand out as much as the rusty old clunkers or the supercars.

Either way, they went inside in good spirits, and were met by a rather bubbly receptionist. He was a man who couldn’t have been far past his teens, and practically bounced back and forth as he addressed every guest, handing them documents to sign – was that a thing resorts usually did? – along with their room keys, complimentary drink coupons, poolside locker keys, and everything else they might need.

Then, after a moment, it was Frank and Cullen’s turn.

“Welcome to the All-Natural Valley Resort!” he chimed, a broad smile on his young, smooth face. “Are you here to check in?”

When Cullen nodded, the clerk quickly handed them a surprisingly thick stack of documents. “Please read through those and then sign them to acknowledge you’ve done so! It’s important to give our guests the best stay possible!”

Before either of them had the chance to protest, the clerk had turned towards the next arrival. That left them staring at each other for a few seconds, before settling down on a pair of seats.

“Well, I guess this is the catch. I bet they’re doing a study,” Frank grumbled. “Seeing what kind of person ends up the most profitable.”

“Or selling our personal data to advertisers,” Cullen giggled. “Well, they’re not allowed to do that without anonymizing the data first, anyway.”

Frank kept reading through the papers. It was all the usual; resort not responsible for any injuries caused by guest’s own negligence, blah, blah, damage to hotel property…

“What’s this?” he asked. “Any induced transformations are also the guest’s own responsibility,” Frank read from the document. “What’s a transformation?”

“I guess it means leaving happier than when you came? Like a mental transformation,” Cullen suggested. “Or muscle growth. They have a pretty good gym.”

“I mean yeah, but do we really need a contract for that?” Frank laughed. “Oh, people these days will sue for anything, won’t they?”

Other than that strange disclaimer, nothing seemed to stand out until the very end. The last document was blank, but for one sentence and a solid, black, line. Please fill in your favorite animal.

“Favorite… animal,” Cullen repeated. That was strange enough to throw even him off. “Why would they need our favorite animals?”

“God only knows with these luxury places, maybe they make custom dishes or something,” Frank sighed. He stretched again, thinking about how he could really use the break, even if the place was a little odder than the average.

“I guess ‘otter‘ for me,” Cullen asked. “Right?”

“Sounds about right, you like those little critters. I’ll just put in ‘bull’ and let them figure it out. Gotta say, I’d prefer steak to… otter, if it’s our dinner options,” he grinned.

“Oh, don’t be silly. They’re not gonna feed us otters… are they?” Cullen asked, suddenly rather unsure of himself. He had no idea what the truly mega-rich ate.

“Not unless they’re the slim, hairy gay man type of otters,” Frank smiled.

With that, they handed the documents back to the clerk, who responded by handing the couple the keys to their room, and all the other stuff he gave everyone, with the same cheerful, almost manic energy.

If he’s got a favorite animal, it’s a ferret for sure, Frank thought. No other animal was quite as energetic.

They had a quick walk around the resort and the surrounding grounds before heading to their room. The place really did seem incredible. Construction of the enormous pools alone must’ve cost millions of dollars, not to mention the main building itself, which must’ve had hundreds of rooms. Add to that a luxury kitchen and whatever other activities they hosted, and the only real answer was surely that it’d cost a lot.

One thing Frank did notice was that every guest he could see was male. At first, he didn’t pay it any mind, the place was targeted towards men after all – to revitalize the masculine self – but the fact that not a single guest had brought a wife or a girlfriend with them did begin to feel a little off.

Not to mention just how masculine everyone seemed. The group he had arrived concurrently with had been average in build. Tall, short, skinny, fat, and everything in between. But the guests who seemed to have been at the resort for longer were all rather muscular, big, and hairy. That fact didn’t go unnoticed by Cullen, either.

“Like, seriously? Everyone here’s an absolute hunk,” the smaller man giggled. “Maybe whatever they do really works. I wouldn’t mind having arms like tree trunks and a belly that’s more like… jeez, what is that, a twelve-pack compared to the usual abs?”

“Yeah. I don’t know,” Frank replied. He liked the sight and the idea, but there was something off about the situation, something that he couldn’t quite put his finger on. Something, in short, wasn’t right. People were too masculine, and it wasn’t as if whatever the resort offered could make anyone grow a foot in length like that.

Could it?

Maybe they’d just selected the manliest guests at first. That was a reasonable enough thought. Big manly men would attract all the other men wanting to look just like that. Or, in some cases, wanting to fuck them.

It wasn’t that Frank wasn’t in shape. He was stocky, strong, maybe not absolutely cut like the other guests, but he was happy enough. And still, he paled in comparison.

“I guess it does make me curious,” he added, to make clear to Cullen that he wasn’t just being negative. Suspicious, if anything.

Cullen smiled. He wasn’t quite as cynical as his larger, hairier, quite a bit less social partner. Oh, most of the time, cynicism was the right call; he just couldn’t bring himself to think that way immediately. It felt better to assume things were as presented and enjoying them as they were.

“Let’s head to the pool,” Cullen suggested. “Well, I guess we need to find our room first.”

Frank was, indeed, still carrying both of their bags, and they weren’t light.

“You’re just saying that so you can see more big, manly men all naked, aren’t you?” Frank scoffed, though playfully, as he glanced at the key to remember what room number they had. Sixty-nine. Nice.

Cullen followed him with a creeping blush on his cheeks, and while the nudity hadn’t been his primary motivation, he couldn’t quite deny the appeal of it either.

Their room was even more luxurious than the rest of the hotel. Two crystalline glasses and a bottle of champagne awaited them in the enormous bedroom, with a bed so large it could’ve comfortably accommodated a whole polycule.

Or an orgy, Frank thought, feeling the stirrings of arousal. Or a couple of those huge goddamn guys we saw.

He wanted to look around; Cullen wanted to get the vacation started, and was already uncorking the champagne. Frank didn’t protest. If he did, the reaction would be more or less along the lines of “Aw, why not? We’re here to have fun!”

And he wouldn’t have been wrong, either.

The bottle was of no design or brand that he recognized. Jus de Changement, read the French name on it – a somewhat odd name that Frank’s rusty French told him meant Juice of Change – though it must’ve surely been from the hotel’s own vineyard. The bottle had a picture of a bear standing on two legs on it.

It bubbled vigorously when poured into a glass, and tasted tart, fruity, and refreshing like any good champagne should. There was an almost musky aftertaste, but Frank wasn’t enough of a connoisseur to pin down what he’d call it. It had an almost animal vigor to it, though. A taste of what he could only call wilderness, and the image it brought to his mind was of wide-open plains, along with raw, carnal instincts, the likes of which only animals would fully experience.

“-to go?” he heard Cullen ask, and shook his head, snapping out of that momentary trance. Apparently, his partner had finished his drink long ago, and the bottle itself was already in the fridge.

“Oh, yeah, the pool, yep, just give me a moment, I zoned out,” Frank explained. He had entirely lost track of time while pondering the champagne’s flavor, but the invigorating energy it’d offered him remained. Along with a certain arousal, the kind of stiffness that most men would experience when healthy and energetic.

In other words, he was hard as rock in his pants, and that only became more obvious when he pulled on a pair of swimming trunks.

The resort supposedly approved of public nudity or even sex, but the conditioning to hide his lust sat deep enough that walking around so erect still made Frank feel rather self-conscious. The feeling didn’t go away even after they arrived at the pool to find it occupied by several couples – or pairs, he supposed – of men making out, or in one case, rather shamelessly fucking just on the pool’s edge.

“Wow,” Cullen whispered, and for once, Frank couldn’t help but agree. There was just something so beautiful about a space that, for once, allow people to just be… well, people, in the most animalistic sense of the word.

The water looked clean despite the debauchery, and so they both slipped in to enjoy the cool caress of the water. After spending most of the day in the car, the water was soothing and invigorating. It almost felt like it was soaking into his skin, Frank noticed. He was probably dehydrated, anyway, so he didn’t mind too much.

But as he sat there, half watching the others fuck and half focused on his own growing arousal, he couldn’t help but notice that there was just something about this place. Maybe it was the open, shameless sexuality of it all that got him going, or maybe they’d put something in the champagne- no, that was a ridiculous thought, a high-end place like this wouldn’t drug their drinks. Maybe a roach motel in the middle of nowhere would, but this place? No.

Still, his body was burning up with desire.

And everyone else was going for it, so why shouldn’t he?

It felt thrilling in the same base, animal way that he was sure drove the other couples too, indulging in that hedonistic corruption. That was why they were here, anyway. The place was clearly built to tempt guests.

He learned towards Cullen. “Would you like to-“ he began, only for Cullen to grab his hand with a mischievous grin, pulling it under the water and to his bare ass. He had already wiggled out of his trunks, clearly hoping for this to happen.

Frank had never really known his partner to be into exhibitionism either, or really, into much that wasn’t romantic, loving, fairly vanilla sex. Sometimes, he ventured into light bondage, or they’d enjoy fantasies about something like werewolves together, but this side of him – this new and adventurous horny side – was new, and it had him in Frank’s lap in a moment, grinding his perfect ass against the stiffness still trapped in the other man’s trunks.

He had been the one to propose it, but Frank still hesitated. He hesitated until Cullen pulled his trunks down and tugged his cock out. All that hesitation bled away, replaced by an almost bestial lust the moment that his glans actually kissed Cullen’s pucker. He thrust upwards with a throaty grunt that didn’t sound like himself at all. He felt so virile, so horny, so vigorous, and soon their mutual moans and groans joined the little chorus growing around the pool, from every couple engaged in their own shameless acts, inspired by each other and the easy-going atmosphere of the resort.

Cullen moaned softly as Frank thrust into him, the water providing a slick resistance to his movements. Soon, he was fucking his partner eagerly, with nothing but clear water to conceal their union as Cullen bounced in his lap, his cock rubbing against Frank’s hairy belly.

Frank grunted with each thrust, his desire for Cullen growing with every unmistakable sound. He felt an animalistic hunger taking over, a primal need that burned within him. The sensation of Cullen's muscles tightening around him sent a jolt of pleasure through Frank, and he found himself completely engrossed in this primitive display of lust.

Their muscles tensed with each pleasure-spasm, each throb of their cocks and each shared whimper or moan, and all weak attempts to retain a somewhat composed, dignified appearance melted away as their movements grew more erratic. They were lost in the moment, their minds focusing only on their bodies and the pleasure they were receiving.

Frank felt like a bull, though he couldn’t quite put it into words with lust choking his mind. He hammered into Cullen’s body, before flipping him over the pool’s edge and mounting him. It felt more appropriate, somehow. Either way, he groaned as Cullen’s ass engulfed him again, and his pucker squeezed around him like a vice, clenching with such eager force that he knew he wouldn’t last long.

None of the other couples seemed to bother with holding back, certainly.

Grinding their bodies together, the two of them lost in their primal urges, Frank felt an animalistic intensity that he'd never experienced before, even when rutting someone. The familiarity of Cullen's touch, the sensations that passed over his skin, were heightened now, sparked by the exotic allure of the place. Frank's thrusts became more frenzied, as did Cullen's moans, each cry of passion reverberating through the water, jolting him further into ecstasy as he rutted his way towards his climax.

In one final, desperate push, Frank let out a guttural growl.

Parts of him were already changing – muscles swelling, and his already plentiful body hair growing thicker and soft, like fur – but he wouldn’t know about it yet. Nor would Cullen, who hadn’t noticed that his once almost hairless body was already covered by a thin layer of peach fuzz, and that his toned build that begun to look cut, with visibly bulging muscle that tensed with each thrust.

Frank erupted into him. Thick, plentiful ropes of cum jetted into Cullen’s body to quench the fire that the two – and the strange resort – had stoked within them. He received every thick drop with joyful moans, painting Frank’s chest with his own seed, delivered by the same orgasm that left him rhythmically clenching around and milking his partner’s cock.

Frank leaned over Cullen, his breathing ragged and heavy.

“I didn’t take you for an exhibitionist,” he whispered.

“I didn’t, either, but that was hot,” the smaller male replied, as they quickly, snuggled up in the water for a little longer to recover after that intense session. “You really do get turned on by watching others, don’t you?”

“Maybe,” Frank laughed. “Love you anyway, you pervert,” Frank rumbled, squeezing the smaller man against himself.

Briefly, they considered if they should tell someone about their escapades so that staff could clean the pool, but it seemed like everyone near it was entirely unconcerned with their cum slowly dissolving into the water. With the little clarity offered by their orgasms, it seemed a little odd. Even at a sex resort, people usually wouldn’t like that, or so Frank thought, but he never voiced those thoughts. It was a little hot to think about it, all the guests being so horny that nobody really cared about getting some of a stranger’s cum on them.

Frank and Cullen remained in the pool for a little while longer, watching another couple at the other side of the pool. It felt like their own private show, even if it was in public view of everyone, and that, in turn, cast an oddly romantic light over the rest of the evening, along with keeping their own lusts smoldering while waiting to recover enough physically to do it again.

Eventually, of course, with their skin pruning, tiredness setting in, and night falling over the resort, they had to leave the pleasant, almost entrancing state they’d found themselves in, surrounded by masculine moans and grunts, with the musky scent of sex thick in the air and soothing – and cum-filled – pool water caressing their bodies.

“I can’t believe we didn’t hear about this place earlier,” Cullen noted as they toweled each other dry, sensually as always, enjoying each other’s familiar warmth.

Mostly familiar.

That night, in their enormous bed, Frank’s dreams were riddled with strange, feverish scenes. He dreamt of himself as a bull, proudly mounting his cows, one after the other. That part, though deeply erotic, wasn’t what made the dream weird. Oh, Frank loved the fantasy of being a bull. They exuded such aggressive dominance, pure virility and manliness, muscle and lust, all of which the bisexual man was rather excited by.

What made the dream strange was what followed. The world shuddered and shifted, and suddenly, Frank was the cow, eagerly baring his ass for a bull that was now someone entirely different. But of course, he did; in the heat of the moment, there was nothing strange about how he was acting. That would come later. He wasn’t a human dreaming that he was a cow, but he had always been a cow, at least for those few hours that felt like an eternity in the land of dreams.

He was a cow. Fleeting images, delivered by his amorphous subconscious – and some subliminal assistance from miniature speakers embedded in the room – of his bull mounting him, fucking him, breeding him, and then of his belly then swelling with a calf or two, and his udders swelling with milk. The next moment, he was being milked, and it was the most beautiful sensation in the world, like all stress and tension was being drawn out of him.

A slight intrusion of real life in the dream reminded Frank that he had no udders. But he had balls. Those could be milked, too. Like udders. The scene shifted yet again; now, he was a pregnant male, with heavy balls that doubled as udders, to be milked for his seed. That sensation was even better, like a miniature orgasm accompanying each tug on the teats.

Perhaps it made no sense, but in the dream, it was perfect, beautiful, and logical, and in real life, his body responded with further changes, the malleability enforced by the champagne and pool water allowing his oneiric fantasies to reshape him. Only a little, at first, but the longer the two men stayed at the resort, the more severe their transformations would be.

Frank woke up to the surprising but not unwelcome feeling of Cullen’s feet pressed against his face. He was still asleep, so it couldn’t be intentional, and Frank reasoned that he must’ve simply tossed and turned a lot. Not that he could remember any of the dreams, which was unfortunate; if he had been able to, he might’ve figured out why his balls had grown to almost twice the size they had been, and why he had two little nubs on his skull, preparing to grow into horns. Instead, he never even noticed either change, not with the pleasant distraction.

Cullen’s feet were soft as always, and though they seemed a little bigger than he remembered them, Frank certainly didn’t mind. He rubbed his face into one sole while rubbing the other, enjoying the familiar heat and contours of Cullen’s body, only serving to further arouse himself again.

“O-oh, good morning,” Cullen groaned, curling his toes as Frank’s playful affections finally stirred him from his slumber. “Someone woke up on the right side of the bed, didn’t he?”

Well, Frank could hardly deny that, and he admitted as much. He had woken up feeling so revitalized that he couldn’t even remember the last time it’d happened. He felt so full of energy, and with energy, as tended to be the case with men, came an inescapable horniness.

As much as he wanted to grab Cullen’s feet right there and then and coat them with his cum, they did need breakfast first. It had already been delivered to the room, and it was a full English breakfast loaded with mouthwatering sausages, eggs, bacon, butter-toasted bread, and all the other fittings. Entirely too many calories, but for some reason, both Frank and Cullen felt downright ravenous, owing to the changes occurring in both of their bodies, most of all the muscle growth. They ate happily, seemingly unable to get enough of the greasy feast at all.

“Are you feeling that too?” Frank asked, between mouthfuls of perfectly salted cuts of ham. “Like… frisky.”

“Oh yeah. For sure. This place really is working, haha,” Cullen replied. “I can practically feel my testosterone levels going up!”

He was joking, of course, but what the two felt was no joke. Everything between them had only intensified in the last twelve hours, and it showed no sign of stopping. The passion, the romance taking a primal turn. How Frank had to fight the urge to flip the breakfast table over, pin Cullen down, and fuck his ass, mouth, or his feet. It was all he could do to finish eating, and only because hunger was an instinct even more primal than lust.

Then, he grabbed his partner, and carried him back into the bedroom, bulging muscles effortlessly bearing the weight of the other man, even though he, too, was getting bigger and heavier. More and more, Frank felt and behaved possessively, aggressively, as if everything he saw belonged purely to him and his swollen cock. In a way, at least with Cullen, they did. He tossed the changing man onto the bed and immediately indulged in his fascination with the other’s feet, letting his kneading fingers dig deep into soft skin and tense muscle.

Cullen, more sensitive than he had ever been before, moaned out in bliss. His cock rapidly shot up to full hardness as Frank caressed each toe. The sight of his partner's arousal only fueled Frank's desire in turn, and he couldn't help but feel an overwhelming sense of satisfaction as his growing appendage pulsed in time with Cullen's moans. He loved Cullen’s feet, and the reactions he so easily teased out of the smaller male each time he touched them. He never could resist moaning out when having his soles rubbed, for example, with how erogenous that part was for him. It was almost more fun than fucking him.

But for each indulgence, they both looked a little less human. Neither questioned it, lulled as they were into the erotic trance the place was designed to induce. Instead, upon noticing that his feet were hard enough to clack against the fine wooden floors, Frank shrugged and promptly forgot about it. Waking up two inches taller than when he had gone to bed was the same. Each change became the new normal, and at most, he would briefly react to the changes before they were swept into forgotten memories.

“Wait, w-what-“ he suddenly groaned, in one of those lucid moments, as a sharp sting of pain at the back of his spine suddenly pulled him out of the moment, almost violently. He clutched at his backside to discover a tail whipping back and forth, having burst through his skin – which immediately healed – and was still growing. “I’m… I’m growing a tail.”

“Of course you are,” Cullen reassured him. The younger man seemed drunk, almost, having had more of the breakfast than Frank did, and at the same time having topped it off with more of the champagne. “Bulls have tails.”

“I’m not a-“ Frank stuttered, but even as he spoke the words, he realized they weren’t entirely true. He was, at least to some extent, a bull. Hadn’t he always been one? “-a bull?”

What he said began as a statement and ended as a question. And then, before he could react, Cullen was there, kissing the tip of his swollen cock and helping banish all those unpleasant thoughts from his head. Cullen took a deep breath, and before Frank could protest, inhaled his cock deep into his mouth, and then throat, nearly gagging with how big the increasingly bull-shaped appendage had swollen. But he managed, if perhaps only because of how much he loved Frank.

Sure, maybe he loved his cock even more. Or, like Frank himself, perhaps he just liked the sounds he could force his partner to make with every little touch and caress, every little swirling lick around his glans and every darting lap over the underside of his shaft.

And of course, it worked. Frank instantly forgot what he’d been worried about in that brief moment of near panic. Instead, his changing body felt perfectly natural again, and with a pleasured moo, he began to slowly slide his cock in and out of Cullen’s welcoming mouth. It felt like heaven, the wet heat of his tongue, the tight grip of his soft lips, and of course, the vice-like embrace of his throat when Frank hilted all the way in.

Cullen, feeling Frank's rhythm, matched it perfectly – his tongue dancing along the underside of Frank's cock, each glide, each swirl imbued with a passion, and not only that, but an animalistic thirst. His hands caressed the bumpy surface of Frank’s increasingly udderlike balls, squeezing each forming teat. It was strange, but like everything else in this strange place, it came perfectly naturally. Of course, a breeding bull had udder-balls, and touching them lovingly only increased the thirst that was already ravaging Cullen’s mind. But before he could extract his prize, in the form of a plentiful load of warm, delicious cum out of his mate, Frank pushed him back down onto the bed and instead grabbed those soft feet again.

“Your turn,” he rumbled. “Your turn to moan for me.”

Then, as Frank possessively clasped Cullen’s feet around his throbbing length, and began to thrust slowly, Cullen did just that. The sensation was almost indescribably intense with how sensitive his feet were, especially once wetted by Frank’s precum. Soon, he was panting eagerly as the bigger male fucked his feet at a steady pace, both of them drawing at least equal pleasure from the act. It took only a few tense moments before Frank sped up, though, feeling his balls ache – and cum slowly oozing from those teats – as he sped towards a climax between Cullen’s soft, warm soles.

Cullen, feeling his mate throb, opened his mouth wide, hoping to catch some of the half-bull’s cum. It only took a few seconds before Frank throbbed again, his cock straining against Cullen’s soles, and the first thick rope of cum lanced out of his increasingly animal-like cock. It soaked Cullen’s face, with the second eruption filling his mouth with that deeply sexual cream, and he just kept cumming, in throb after throb, from his overfilled balls.

Cullen swallowed what he could, relishing in the warm mess filling his stomach and coating his feet. There seemed to be so much of it, gallons of it, far more than he’d ever seen Frank cum before.

Yet even that orgasm ebbed, affording the two changing men another glimpse of clarity.

“Fuck… I… really came a lot, didn’t I?” Frank panted, staring at the mess he had made in the throes of passion. Cullen was almost covered in it. “That can’t be normal.”

He still couldn’t see the other changes; the glossy fur creeping along his arms, to quickly cover all of him, or the inches that he grew with each tainted meal. But he was intimately familiar with how much he came, and this was too much.

“Yeah, I don’t know,” Cullen grinned, all but dismissing his partner’s question entirely. “It’s hot. This place really is amazing.”

They cuddled together in that mutual mess, with Frank trying his hardest to figure out what was going on, but struggling. Each time he felt like a realization was dawning, his thoughts ended up focusing on sexual things instead. Like how badly he wanted to fuck Cullen. How good his ass felt pressed against him. The fact that he was starting to feel an emptiness inside himself that he’d need Cullen’s cock to fill.

It was no surprise, then, that the two ended up going again, and again, and again, seemingly possessed by unending animal vigor, until the next brief glimpse of clarity. Frank looked at the clock with unfocused eyes, with his head resting on Cullen’s swollen belly, once the afterglow of their latest mating had settled in a steady full-body buzz rather than the immobilizing bliss it had started as.

Three in the afternoon. He felt as if it’d just been morning. Had they really spent almost six hours on nothing but fucking each other in various ways? The splatters of cum on their bodies and on the bed told them as much, but he couldn’t remember much except constant, mind-shattering pleasure.

But that was fine, wasn’t it? It was why they were here. To finally get to relax a little.

With another wonderful orgasm had, and the taste of Frank’s cum still lingering on both their lips – Cullen loved kissing him, after all – things continued as they had so far in paradise. Every day was wonderful from the food and drink that kept transforming their bodies, to the deep relaxation induced by the subliminal programming that neither ever noticed, but that was slowly transforming both of their minds.

It wasn’t just them, either.

Everyone at the resort was starting to look more like animals. As Frank and Cullen walked around, aimlessly, half remembering what they had originally planned, they saw everything from anthropomorphic bears and horses, to big cats and wild dogs. Yet, all of that seemed normal, as if half-human animals were the most common thing around. The same way, their own changes weren’t the least bit alarming, or even noticeable.

They were here on a romantic getaway, and that was all that mattered. Wasn’t it? A romantic getaway that’d last as long as they wanted it to last. Frank, having had the larger portion of the champagne, could barely remember what his job even was. Cullen could, but it felt distant, as if he’d been on vacation for a year and would remain like it for however long he wanted.

And so, the days went by. Each day, Frank looked more like a bull, and Cullen more like an otter. Each day they fucked shamelessly in the pool, or the sauna, or in their room, without a care in the world. Every night they slept entangled in each other and covered in a mutual mess, usually with Frank’s heavy head on Cullen’s soft belly, using his reformed body as an intimate, improvised pillow. Indeed, it was a hazy kind of paradise, an unrelenting parade of carnal pleasures both messy and loud.

Cullen coming to him with an invitation was the first clear memory Frank had in the last couple of days. It was a little letter that invited them both to the hotel’s Milking Spa.

“A milking spa? What’s what supposed to mean?” Frank asked. His head felt sluggish, with a sexual aggressiveness boiling just beneath the surface. But that wasn’t all of it. He also wanted to be taken. The conflict between two sets of urges left him feeling dazed and frustrated.

“Well,” Cullen drawled. His voice had deepened a lot, and his once perfectly flat belly had grown with the transformation. His toes stuck together ever since getting his feet fucked, with webbing forming between them. “I think they like… milk the stress out of you.”

“Yeah, that sounds kinda weird, doesn’t it?” Frank replied. Had he been able to look at himself with a clear mind, he would’ve noticed the changes instantly. His skin was blackening, a soft fuzz covering most of him by now. A pair of horns had almost fully grown out of his head. His feet had hardened into undeniable hooves, and most of all, his achingly heavy ballsack was at least three times as big as before.

But he didn’t notice any of that. The resort had lulled him into a bizarre state of mind where everything felt perfectly natural, no matter how incredibly wrong it might’ve been. Like a dream. His increasingly primitive mind, soon to only be concerned with two, maybe three things, was already made up about the “milking spa” as well; he just didn’t know it yet.

And inside him, that heat grew and grew. A transformative surge boiling in his belly. The cow part of the resort’s mad science. He’d filled in bull, but someone unseen had seen it more fit to use up some of the old cow stock of mutagens, slipped in everything he ate, while the pool had ensured his body remained malleable and receptive to all changes.

That meant he was quickly developing a womb. One eager to be impregnated, flooding him with hormones that told him to hop on the nearest man’s lap and ride them until they filled him with the gift of their virile seed. Frank, though, didn’t understand these new urges yet.

“I guess we could go, I am feeling a bit tense,” he finally grunted, unknowingly sealing his fate.

The spa inside the resort was perhaps the most luxurious of all the spaces they had visited, decorated in gold, marble, and crystal, yet also – and once again, totally unbeknownst to the pair – the most transformation-inducing. The fragrant steam that immediately engulfed the two men as they stepped inside was full of diffused mutagens, tailored specifically to them. As indulgent and large as the space was, only a few people were ever invited inside at once.

“Is… is anyone here?” Frank called out. The mental slowness was only getting worse with each breath, and he wasn’t even aware of his cock sticking straight out, hard and growing. “Like, anyone at all?”

No answer. But in the middle of the main room were two tables with sleeves. The kind that obviously went over an erect cock. There didn’t seem to be anything else to do, so Frank clumsily laid down on top of one, waiting for someone to guide him further.

“Want me to fasten those?” Cullen asked. He was changing quickly, now. His face barely looked human, and his growing moustache had turned into bristly, mustelid whiskers surrounded by brown fur.

“Yeah, I guess you should,” Frank replied, slurring his words again. But he needed some kind of relief.

“There’s two cups, where does the- oh, over your balls, like…” Cullen muttered while kneeling behind the table and working on the strange mechanisms. He slipped one long sleeve over Frank’s stiff cock, and the other over his bloated balls that looked more and more like the ones he had in that dream. Like udders, more than testicles, though perhaps functioning as both.

It might’ve looked strange, even abnormal, but it felt amazing, and the increasingly bull-like Frank groaned happily as a suction formed, first around his cock, as the sleeve began to slowly stroke and tease his cock. Each slippery motion of whatever inner mechanism it used to milk men dry felt like heaven, and thanks to his increasing size, it felt rather wonderful squeezing down around every inch of him.

But the other sensation was even stranger. The second sleeve tightened around his balls, tugging on every forming teat to gently suck the cum straight out of his balls. That made him moan out loud, and the sound was almost exactly like to the mooing of a bull… or a cow.

“Wait, what is… what’s happening,” Frank stuttered as he finally noticed that his face was stretching into a bovine muzzle, but it was far too late to do anything about now. He couldn’t even muster the strength to move with the squeezing tugs of both milkers draining him of strength with each jolt of pleasure.

It was a form of mental conditioning, in the end, to accompany the last physical transformations. Oh, he’d regain all that energy once his changed mind cleared up. But first, he’d get to relax as the last remains of humanity were slowly milked out of him, leaving only his mutant bull thoughts.

“Fuck, you look so sexy like that,” Cullen commented. He, too, was changing rapidly now. He was almost twice as muscular as before, with a muscle-gut that he’d never had, contrasting with an increasingly mustelid shape, in turn best exemplified by the thick tail emerging from the very base of his spine.

If the person he had been before coming to this place looked at him, he might’ve described his new self as an otter daddy. But watching Frank get milked – both his cock and his new, strange, udderlike balls – was incredibly erotic, and it stole all of his attention. All his desire, too; his heavy cock was quickly swelling up to full hardness as he watched Frank weakly roll his hips into the tube’s suction.

He wanted to breed him.

They were both males, it couldn’t work.

But something about Frank’s new, animalistic scent told Cullen that it would, against all reason, and those instincts were in full control, with reason a distant second. Those instincts also told him to fuck his mate. So, with Frank busy moaning and groaning as his cock and ball-teats were relentlessly squeezed and caressed by the sleeves, he took the opportunity to press his cock against the black, fur-rimmed pucker of the newly-minted bull’s ass.

Frank gave another mooing groan, this time one of pure desire. Cullen placed his cock at his beloved partner’s entrance, groaning at the feelings as he always did. Even if he usually took the bottom role, when he was on top, he was just as spellbound by the raw dominant rush of it. The squeezing of Frank’s ass only made it better, thrusting through that tight, strong ring and into the intense heat of his body.

“Yes, fuck me!” Frank suddenly commanded, this growing aggression reaching a boiling point as his mind bent, and then broke under the pressure of the transformation. Between the sweet ache of his muscles growing, his spine stretching out, and the wonderful pleasure of having his unnatural udder-balls milked. Little remained of his formerly human self by then.

Cullen's thrusts grew more urgent, matching the animalistic passion that surged through Frank's veins. He plunged into his mate with a ferocious, almost predatory joy, the musky scent of their lust driving them both wild. Their bestial instincts had taken over fully, and they mated with the raw, unbridled joy of beasts in heat.

As Frank moaned and groaned, the utter pleasure continued to build within him. The frenzied sucking and tugging of the milkers on his cock and balls seemed to reach inside of him, squeezing out the last remnants of his humanity. Cullen's cock slammed into him, the rough friction only intensifying the sensation. It felt as though the entire universe was being sucked into the vortex of their passion, and they would never return from it.

Not as humans, anyway.

“Harder! Fuck me harder!” Frank commanded. The sleeves were already filling with his cum, but he needed to feel Cullen inseminate him. To breed him, to somehow knock up his otherwise male body. He thrust back against the otter – that was what Cullen had become, no doubt about it – with a shuddering, carnal need to be filled. He teetered just on the brink of climax, and Cullen wasn’t far behind.

Just a few more frenzied, vicious thrusts, as if he was trying to force the last human thoughts from Frank’s body. Each thrust was like a shockwave, slamming into the bull with animal ferocity.

Then, with a final grunt of pleasure, Cullen hilted himself inside Frank’s inexplicably fertile body, and came. He throbbed hard inside the bull, cock jerking and twitching as it filled him with thick, warm jets of seed, all delivered almost directly into his hidden womb from the sheer force of the otter’s orgasm. Enough of it to assuredly knock him up, too, and the sensation of that was beyond intoxicating for Frank. It came with a soothing, deep relaxation even in the middle of his own orgasm, one that he couldn’t ever have imagined even existing. One that left him gasping for air and his body feeling almost gelatinous.

The satisfaction of another male’s seed taking root inside him.

He filled the sleeve, surrendering to the milking and bucking weakly into it in the throes of that breeding-bliss that had swallowed them both, as they finished their almost feral rutting.

“Mmh, that was amazing,” Frank drawled. Even his mouth felt numb after what he’d just been through. “I’m gonna have to like… fucking ride you,” he added with a groan. “Love you.”

“I love you too,” Cullen replied, breathlessly. He was almost tempted to make Frank fuck him right then and there, but instead, he afforded himself a few blissful seconds of fading orgasmic pleasure inside the bull’s body, while tightly hugging him from behind.

All thoughts of ever going home had disappeared from their minds a few hundred thrusts ago. This was their home now. The transformation resort that turned both men into what they were now; a pregnant bull, and his otter daddy. But what need was there to be anything else? Mad science or not, what had happened to them was a blessing, their lives filled with nothing but pure pleasure forevermore.

Frank and Cullen eventually became the resort’s mascots, in a way. Their love for each wasn’t diminished, and between that mutual affection and their unending erotic lusts, they were the perfect couple to advertise the resort as it grew beyond having to trick people into being transformed. To the great surprise of the resort’s directors, people wanted to become big, horny beasts with little on their mind but physical affections.

Maybe it was understandable, with the world the way it was, and it suited them just fine. It suited Frank and Cullen even better still; being the official mascots of the entire transformation resort, many guests specifically wanted to play with them directly – especially once Frank’s belly began to swell too – and both were just as happy to share their new gifts.