An Experimental Break - Rhino TF

Story by WyraachUr on SoFurry

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This story has been available to my Patreons prior to uploading here - check it out to get early story access as well as access to my Discord for just $5! https://www.patreon.com/ShadeTheRaven

(Please keep in mind due to recent events, writing and Patreon uploads will be delayed till I'm in a better mental state to continue)

After getting that awesome rhino TF manip from , I wanted to do a story to tie in with it. However, not really being able to get much from the scenario he based it upon, I fell back with one of the ideas I originally pitched scenario-wise for it. This'd probably work out well if anyone ever wanted to expand upon it and turn it into an audio TF :P

Took a more willing twist on it as well, cause again, ya know me by now, if I'm gonna end up as an animal, I might as well enjoy it :P

The original manip (well, my upload of it), can be found here: https://www.furaffinity.net/view/38693760/

Posted using PostyBirb


"So... this is where I'm gonna be staying the next few days?" Peter asked, taking a look at the ground-level apartment. It wasn't anything too fancy, just a modest building overlooking a nearby nature preserve.

"Yes, the doctor said that this little arrangement should make you feel right at home... even if you've travelled across a few continents to get here!" The assistant chuckled.

"Doesn't look too bad... then again, I can't complain, this is all free, and god knows I needed the break!" He smirked - he couldn't believe his luck, being offered a free African vacation with all expenses paid - all he had to do was help the doctor out with some research here and there, and he'd have the rest of the time to enjoy himself. "Could have done without the shot on arrival, though."

"Sorry about that, standard procedure to protect our guests from tropical diseases - you wouldn't believe how many mosquitoes we get around this time of year!"

"Trust me, I'm used to putting up with insect infestations at home - summer nights are the worst, you leave one window open and the next thing you know, you've got a swarm of microscopic pests flying around the room!" He had to laugh. "The room's turned into a sauna on more than one occasion!"

"Well you won't have to worry about that! Just kick back, relax, and we'll check in on you later on!" The assistant waved as he turned to head back to the office, letting Peter sort himself out.

"I'll try not to make too much of a mess whilst I'm here!" He called to the assistant.

"Oh, it's not a problem if you do..." He quietly responded. Once back inside, he picked up a clipboard with some note pages on it, the top of it labelled 'Serum Log: R89NO'.

"How's the guest doing?" The doctor asked.

"He's getting ready to settle in."

"Perfect... how long till the serum takes effect?"

"Hopefully within the next hour. Once it's due to take hold, we'll start with the special measures."

"Special measures?"

"Well he wants an enjoyable holiday - we might as well make it unforgettable, even if he should forget everything!"

"Heh... if it were up to me, I'd leave them as they normally are."

"That's true... but it never hurts to have a little fun now and again, Doctor Flame~"

~~~~~

It didn't take too long for Peter to unpack everything, checking out everything in the apartment, as well as taking a few glances out towards the nature preserve. From where he was looking, it was a short walk away, and there wasn't much in the form of gates - anyone was free to enter and leave as they wish, if that meant the animals as well was anyone's guess.

"Might have to take a look once night falls - would be nice to get some photos!" He smiled, heading back inside to sit down on the sofa, looking at the big TV. "Hrm, wonder what they've got on here~" He picked up the remote, turning it on, and the first channel it landed on appeared to be documentary footage of a pair of rhinoceroses. "Heh, figures they'd have nature channels out here..." he paused when the larger male proceeded to mount the smaller female, driving his maleness into her. "Oh wow..." He blushed, quickly changing the channel to a news station. "I don't think they'd show that stuff on daytime TV back where I am!"

"Was that intentional?" The doctor asked, watching in on Peter via numerous cameras set up in the building.

"In a way, yes - I had that particular moment queued to when the show should begin. That last couple who came here really were a pair of frisky bastards!" The assistant joked.

"Figures there'd be some small semblance of humanity left... were you expecting him to actually watch it?"

"Soon enough..."

Peter sat back, watching the news program, when suddenly he became aware of a dull throbbing in his head. "Ah...aah..." He winced, feeling it. "Probably just a headache... it's been a long trip..." He thought, rubbing his head. It continued to persist, slowly growing more intense. "Aaah... this keeps up, I may need to get some aspirin..." He rubbed it again, when suddenly he felt something... unusual. "What the..." He paused, his hand feeling around something long, bony and sharp. Whatever it was, it grew under his touch, longer and longer - he was soon able to identify it as a horn.

"That... that can't be normal, right?" He asked, feeling it up, finding it to be strong and sturdy. The dull throbbing resumed shortly after, yet this time it was starting to affect his whole body. "H..haah!" He moaned, slumping over from the weird sensations. He rested himself against the side of the sofa, gripping it hard. He looked towards his hands, and saw that they appeared... thicker than normal, the three middle digits even looking larger. "What... what's going on..."

"Looks like it's working as standard... I guess this is where you start to ease him into it, right?" The doctor asked his assistant.

"Oh you know it~" He shot him a knowing smirk, pressing a few buttons on the nearby console. The air conditioning in the house turned itself on, quietly whirring as it pumped in some fresh air... among other things.

"Gggh... is... is the shot doing this?" He looked at his arm, the site of the injection looking very dry... as a matter of fact, the skin along his arms was looking dry and rough, and it was steadily spreading all over. "I should try and find that assistant..." He started to push himself up to his feet, when an odd, subtle aroma hit his nostrils. He sniffed the air, nostrils flaring as they enlarged. "What is that smell..." He took in another inhale, his thoughts calming momentarily, worry momentarily subsiding whilst a fire started in his loins.

"Female rhino pheromones~" The assistant grinned from ear to ear. "This should make him nice and receptive for what's to come!"

"Mmm..." He took another sniff, the horn protruding further upon his head, signs of a second one showing above the original. The front of his shorts bulged obscenely, not being helped by the fact that his body was growing bigger throughout all of this, clothing becoming increasingly snug as he attempted to stretch himself. "Mmrrfhh... hhrggh.. hhrrraaaaaaAAAHHHHH!!" An inhuman bellow left his mouth as his shorts gave way, splitting open around his legs and painfully erect cock. It twitched and throbbed, elongating, becoming girthier, whilst at the same time mutating drastically, the shape of it twisting and unfolding into a lightning bolt-esque design, a small, tube-like growth jutting from the tip. "Oooohhh fuuuuck... my cooooooock..." He huffed, his voice coming out much deeper and hoarser than before. He looked at his beastly phallus in a mix of shock, confusion and awe, trying to comprehend just what was happening to him, letting out another low moan as his balls expanded to better match his new shaft, the foreskin pulling back and attaching to his stomach to form a sheath.

"So far it seems the serum's hitting all the right notes." The doctor noted. "Still, I'm more used to watching them struggle and try to fight their fate~"

"Aw come on, you've got to let them enjoy it at least once or twice!" The assistant intoned. "If it's grim all the time, it'd feel the same after a while!"

"I suppose you have a point there..."

"And speaking of enjoyment..."

Peter let out another low groan, trying to push himself back into sitting up. His shirt drew tighter still, tears beginning to show in the fabric, caused by his body expanding further outwards. His torso barrelled forwards, stomach becoming broader. His build had already been large before, but now it seemed to be gaining fat and muscle at an alarming speed, bones clicking and popping as his body reformed. "Uurrghh... I need to contact the assistant..." He mumbled, seeing if he could spot a phone in the room, only to be called back to the TV, the channel switching itself back to the two rhinos mating. "What.." He reached forwards, picking up the remote, fumbling with his larger hands as he changed away from it again, only for the channel to switch back to the display. The flow of pheromones picked up as the remote dropped from his hands, twitching as they fattened up further.

He tried to look away from the screen, but the scents filling his nose, alongside his slowly-changing instincts made it impossible to do so. He saw the two rhinos on screen doing the deed... rather, in his head, he saw himself atop the female, thrusting into her. Such thoughts had no place in his head, yet due to the doctor's machinations, he couldn't ignore them. His hand moved to his shaft, slowly stroking along it, sending a shiver of pleasure down his warping spine. "MrrrrraaaaaaAAAHHHH!!" His voice devolved into another bellow, his vocal chords altering further by the second. "Ffhhhh....fhhhucccckk.... Sooo.... Hhhhhoorrrnnnhhhhhyyy!"

He continued stroking his odd, inhuman spear, the pleasure just about overriding the discomfort caused by the continuing changes. He could hear the sofa creaking underneath him due in part to his increased weight, a matter not helped by the fact that his rear quarters were now steadily growing to match the rest of his body. A short, thin tail wormed its way out of the base of his spine, a tuft of dark hair growing at its tip, idly flicking behind him. He again tried to break his attention from the TV, but it was a pointless endeavour - he wasn't in control of any of this, so all he could do was accept it. His stroking eventually became ineffective, the three middle fingers gaining large, hoof-like growths, the thumb and pinky fingers withdrawing into his body as his hands became the broad, bulky forefeet of a rhino.

"Hrhrhh...hhrhrrrhrhrHRHRHRAAAAAAAAAAAHHHHHHH!!" He trumpeted yet again - even as he was unable to please himself, his previous efforts had not been without waste, his balls churning as he came, emptying the remnants of his human seed, no longer needed. At the same time, the sofa gave way under his weight, cracking and splintering as he fell forwards onto the table, his mass snapping it in half like a matchstick.

"Damn... I knew the changes would cause a bit of a mess, but I wasn't expecting him to flat-out destroy the sofa and table like that!" The assistant frowned.

"Those are the sacrifices that have to be made - it's not like we have a shortage of them, given what we're doing!" Doctor Flame chuckled.

"But those were the ones from my room! I had to use them for this set-up as the replacements hadn't been delivered yet!"

"Oh don't worry, I'll make sure you're reimbursed for that, and you'll be able to help yourself to a new pair once they arrive."

"Urf... looks like I'll be eating dinner on the floor for a few days, then..." The assistant mumbled.

"Hrhrh...hrhrhrh..." He huffed and snorted, trying to get back to his feet. He felt his thighs swell further, muscle bulking up, his ass ballooning further outwards. "Fhhhhuuuckkk... this feels wrooooong..." He looked at his legs, trying to move them. His feet popped and clicked, causing him to stumble as they steadily underwent a similar metamorphosis to his hands, the limbs losing a few inches to help better prepare him. He took a few steps forwards, his bulky frame jiggling and swaying, balls slapping between his thighs, drawing more twisted moans from him. "Hhrrrwaahhh!!" He trumpeted, his head hurting as his thoughts regressed further. "Nnhhheeed to find them..." He could feel his cock twitching again, erecting itself. "Nhhheeeeed.... fuuuuuuck!"

His body groaned and twisted again, his chest barrelling forwards whilst his shoulders grew heavier, broader, wider. He landed down on all fours with a heavy thump, shaking the room as his neck realigned, almost vanishing into his much broader upper body. He tried one more time to try to focus on getting assistance, never once knowing that this had all been intentionally set up, or that he was being watched the whole time, but his changing instincts and altering brain made it all but impossible to think of anything other than the need to breed... it was probably a good thing then that the nature reserve was close by.

"Rrgghh... well if this is how it...hhrhgheeeennnnds..." He moaned, hair receding into his scalp, ears growing to points that moved atop his head. "I...hrrhghhg... might as well show them... hhrrgghhhhhh... what I've goooootttttttHHHHHRRRGGHH!!" His last words vanished into a bellow, a slight smile crossing his face moments before it pushed forwards, eyes moving to the sides of his developing muzzle, teeth growing larger and flatter to better accommodate it. His changes complete, there was nothing left of the human that had been Peter outside of torn clothes and some of his belongings. All that was left was a big, horny rhino that had spotted the way outside, snorting as he charged through the glass doors, shattering them, making his way to the reserve.

"Well... it's lucky he doesn't have to pay for repairs... had he have waited, I would have gladly opened the doors for him." Doctor Flame couldn't help but smirk. "Least he didn't cause too much damage, compared to everyone else who freaks out, he kept the destruction to a minimum - surprising, given his size!"

"Yeah, remember the time with the guy you turned into an elephant? I'm surprised the place was left standing after that!"

"Don't remind me!" He laughed. "Some of my best work, but also my most costly! I'm sure that Peter will be happy with his new life here, as will the next batch of test subjects." He looked at the notes he and the assistant had compiled - all were pleasingly positive. "Though I suppose it'll be business as usual with the next batch!"

"Probably - still, it didn't hurt to make it less traumatic for once!"

"That it didn't... I might have to keep that in mind for some select subjects~"