Testing the Limits

Story by KindleFoxfire on SoFurry

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Another emergency commission, this one features Zev, also known as Nuclear_fusion or fox_fusion.

It seems the foxy has signed on for some muscle growth experiments and a certain hunky tiger has been assigned to be his caretaker. Obviously, we don' t get anywhere close to his true limit here, but hopefully this will be continued soon! :3

Zev belongs to his player. Kindle and Bradley belong to me.


"Welcome, Zev," the small fox in the lab coat said to the larger fox across the table. "I'm glad you found your room okay."

Zev glanced around the small room and nodded. It was white, from the tiles on the floor to the ceiling, but something about the way the lighting fell kept it from being stark. There were no windows, but even so, the room was comfortable, furnished with a couch and a large screen television mounted in the wall, a white table, white cot, and white counter with sink, stove, and refrigerator. In opposite corners there were open doors leading to a small bathroom and a small closet, respectively.

"Yeah," Zev said. "No problem. I'm just...excited." He gave a bashful grin but the small fox chuckled, pushing his glasses up his snout.

"Good, good," he said. "That's the kind of enthusiasm we're looking for in these trials." He made a note on his clipboard and looked back up to Zev. "Now, your caretaker should be here shortly, but in the meantime, do you have any questions you'd like to ask?"

Zev chuckled. "About a thousand," he said. "Like...shouldn't there be some exercise equipment or weights or something?"

The small fox chuckled again. "Not at all," he said. "Remember, this drug trial isn't about testing how strong it makes you...what we're trying to determine here are the limits of the drug's effects. We expect the effects to be rather extreme...too extreme for weights."

Zev's eyes widened just a bit at that. When he'd signed on for the muscle growth experiments, he'd expected to be put on some kind of workout regimen along with whatever drug they were testing. He hadn't been expecting an apartment inside the Foxfire facilities, or to be sitting across from Bradley Foxfire himself.

"So...what exactly will I have to do?"

Bradley looked up at him with a crooked grin. "Really, nothing at all," he said. "Your caretaker will administer the drug and make sure that all your needs are met."

Zev's toes curled as his tail moved slowly behind him. "Umm, about that...who is this caretaker? Will she be staying here with me?"

Bradley's grin broadened as he glanced from the fox to his clipboard. "Well, I'll just say this...your caretaker was chosen based on the profile and application you submitted. I personally recommended this particular caretaker after reviewing your file." He couldn't suppress the giggle that welled up within him. "I don't think you'll be disappointed."

He stood and walked around the table, shaking the fox's hand and grinning, leaning in close to Zev and whispering confidentially. "And don't be afraid to take full advantage of your caretaker," he said, voice practically purring. "He'll be more than happy to meet ALL of your needs."

Zev's eyes widened as he felt a blush creeping up his face beneath his fur. "He...?"

But Bradley just chuckled and headed towards the door, one paw holding his clipboard, the other stuffed into his lab coat. "He'll be up soon," he said, pausing at the door to turn to look at him. "Just remember to have fun and enjoy yourself," he said. "We'll take care of everything else."

He let himself out the door and Zev sat back down at the table for a moment, drumming his fingers on the bare white surface. His gaze finally settled on the television and frowned, seeing no way to turn it on. He went to it and traced a paw over it, but found no visible buttons. A quick inspection of the table and counter revealed no hidden drawers and no sign of the remote.

He was busy pulling up the couch cushions when the door opened behind him. "Looking for this?"

Zev turned to find a large tiger smiling before him, two bags slung over his shoulder, waving a remote in his paw. He was tall, over a foot taller than the fox, and built like a bodybuilder. He wore a black tank top that left his strong, striped arms bare and let the mounds of his pecs peek out of the low cut collar. The tank was tucked into a pair of khaki cargo pants which were themselves tucked into a pair of black military boots. One of the bags he carried was a black duffle bag, the other a white medical bag with the Foxfire logo emblazoned on it. He grinned at Zev, green eyes shining.

Zev caught himself staring, the blush crawling up his neck again. He raised a hand to rub at it as he gave an awkward grin and stood slowly. "Uh, yeah, thanks," he said. "I'm Zev...you must be my caretaker, I guess?"

The tiger grinned again, flashing teeth as he closed the door behind himself and put his bags down on the table. His paws free, he moved around the table and offered one to Zev. "Nice to meet you," he said. "I'm Ryan Kindle, but most people just call me Kindle."

Zev took the offered hand in his own, surprised by not only how big it was, but how soft and gentle it was as well. "Wow...," he said. "I, um...I'm kind of surprised."

"Oh?" the tiger raised an eyebrow at him. "Am I not what you were expecting?" He chuckled and rubbed the back of his neck slowly.

"NO, I mean, you're great and all...just..." Zev's ears lay flat in embarrassment, his head hanging a bit as he looked up to the tiger. "It's just...you're such a big guy to have such a gentle handshake."

The tiger grinned widely and chuckled. "I get that a lot actually." He went back to the table and picked up the black duffle bag. "Let me put this away and we can get things started." He took the black bag over to the cot and stored it away underneath, then went back to the table and opened the medical bag, paws disappearing inside.

Zev glanced at the black bag and then back to the tiger. "Are...are you staying here with me?"

"Yep," the tiger answered as he raised a needle and a few marked vials from the white bag.

"Ummm." He wasn't quite sure how to ask this next part. "If you're on the cot, then where will I sleep?"

Kindle looked up at him and smirked. "Don't worry, foxy," he purred. "I'll take care of everything." He finished unpacking the contents of the medical bag and looked up at Zev once more. "Now...do you know how this works, or should I explain?"

The fox glanced over the vials and needles on the table and frowned. "Maybe you should explain again?"

The tiger smiled reassuringly and stepped towards the fox, a paw falling on Zev's shoulder and directing him towards the wall. He pressed a button on the remote and a hidden panel on the wall slid open, revealing a large mirror. "Take a look," he said, pushing Zev forward.

The fox looked himself over with a critical eye. He wore gray sweatpants and a baggy red t-shirt. His paws were small and black, the same shade as his muzzle and ears, as well as the line of fur going from his nose down his back, all the way down to his tail, which ended in white. His chest and chin were white where they were visible around the shirt, and the rest of his fur was a burnt orange.

Standing before the towering tiger, he definitely didn't look muscled, but he was toned. He had a lean build to match his 5'8" frame, but somehow...it had never been enough. He had always wanted to be bigger, and always admired the kind of muscle the tiger had on display. No...he wanted muscle even bigger than Kindle's, if he was being honest.

"I know what you're thinking," the tiger said, his paws resting on Zev's shoulders as he leaned in close, whispering in Zev's ear and making it flick with the sensation. "You're looking at yourself, and all you're thinking is that you want to be bigger, right?"

Zev nodded slowly, his braid sliding along his shoulders. "Yeah...," he said, his ears laying back again. "I know that must sound lame to you, but..."

"Not at all," Kindle interrupted. "I understand completely. That's why we're both here," he said. "We're going to make you so much bigger...bigger than me...bigger than anyone you've ever met."

He grinned at the fox's dream-like expression, and he reached over to the table and lifted the first vial, holding it up for Zev to see. "And this is where we start. This is the first injection...one shot in the arm, then we wait four hours. You won't see much of a difference at first," he said. "But after four hours, you'll get the next shot, and things will start to move a little quicker then. One dose every two hours after that, until you reach your limit."

Zev swallowed hard, looking over at the vials. "How will I know when I've reached my limit?"

Kindle gestured to the room around them. "This entire room is monitoring us at all times...everything you can think of...blood pressure, temperature, blood sugar...everything you can think of. It'll handle all the measuring without you even noticing. It will let us know when we have to stop...but until then, we keep going, as long as you want."

The thought of growing, swelling with muscle, indefinitely, sent a shiver down the fox's spine. "Okay," he said. "....when can we start?"

The tiger's grin returned as he released his grip on Zev. "That's my foxy," he said as he prepared the first injection. "Give me your arm." When the fox presented it to him, the tiger stroked it slowly, fingers trailing lightly over him until he paused at the bend of the elbow and found the vein. He pushed the injection in, feeling the slight flinch from the fox and chuckling. "Almost done."

He pulled the needle away and disposed of it, dabbing the spot of the injection and putting a small bandage over it. "Don't worry," he said. "It'll heal very quickly."

Zev looked himself over again in the mirror as the tiger went about his business. He frowned as he flexed his arms. "I know you said I wouldn't see anything right away, but I've got to admit I'm disappointed," he said. The fox looked over to find the tiger bent by his black duffle bag by the cot. "What are you up to over there?"

Kindle turned and grinned, holding up a pair of video game controllers. "Well, as your caretaker, it's my job to make sure you stay entertained while you wait," he said. He stood and moved over to the couch, sprawling on it with one hand along the back. "And I heard you like video games."

He tossed a controller towards the fox and Zev easily caught it with a grin. "Okay," he said, coming to sit by the big tiger and leaning back a bit so that his head brushed the tiger's arm. "You're on!"


The hours flew by as the fox and tiger lost themselves in the game. Zev was nervous at first, but as they got more involved in the games, racing and battling both with and against each other, he realized they were already settling into an easy familiarity. When they captured the other team's flag after a two hour campaign, they high-fived each other and celebrated. When the tiger picked Princess Peach, they laughed and much teasing ensued. They took a short break for lunch, where the tiger displayed a certain lack for cooking - "um...ramen or PB&J?" - but by the time the alarm finally sounded, Zev had nearly forgotten why they were there.

Kindle paused the game and turned off the small timer before standing and stretching, the muscles in his back rolling as Zev watched. "Mmm," he said. "I guess it's time for the first real shot."

Zev watched him a moment with a blush, then stood as well, giving a little stretch himself. Kindle glanced at him and chuckled. "Good," he said with a grin, "stretch out now while you can."

Zev raised an eyebrow as he did so, raising arms over his head and rolling his head around a bit to loosen up his neck. "So this is a 'real' shot, huh?"

The tiger nodded. "The first is really to get you ready for what's coming," he said. "You probably can't feel it, but the first injection made you a little more pliable and responsive. Your body - particularly your muscles - will be more receptive now, and you'll be more sensitive all over."

The fox's ears perked at that. It was the first time anyone had mentioned any kind of increased sensitivity, but he supposed it made sense. "Okay," he said, "so I guess you need this..." He presented his arm, pulling off the small bandage for the tiger and inspecting the injection site. He thought the skin beneath his fur there might be bruised or red, but there was nothing...no sign that he had been injected at all. "Guess you were right about it healing fast," he said, running his finger over the spot.

"That's nothing," the tiger answered as he prepped the next shot. "Wait until we've gone a few rounds," he said with a chuckle. "I won't even be able to get the needle into your arm."

Zev's eyes widened as a flush crept up his face. He opened his mouth to speak, but he had no answer for that, so he closed it and swallowed hard. The tiger's soft paws gently took his arm again, stroking along the bend of it until he found the vein once more. The injection went in smoothly, and despite the warning of increased sensitivity, the fox barely felt it this time.

"All done," the tiger said with a grin. He disposed of the needle and took Zev by the paw, guiding him over to stand in front of the mirror once more. "You're going to want to watch this," he said.

Zev nodded slowly as he was led to stand in front of the mirror. He couldn't see any difference yet, but he could feel something happening, just below his skin. "I feel...strange," he said. "Almost like an ache, but...that's not quite it."

The tiger stood behind him, nodding and slowly kneading his shoulders. "That's normal," he said. "Just try to relax," he said, voice soft and calm in the fox's ear. "And just let it happen."

Zev swallowed hard and nodded, eyes fixed on his form in the mirror as the sensation spread through his body. It didn't feel like he was looking at himself in the mirror - it felt more like he was watching a time-lapse video of someone else. It was so slow at first that it was barely noticeable. But as he watched, his shirt seemed to swell outward, and the baggy sweat pants began to grow tighter around him. He felt himself flush as the aching, uncomfortable feeling flowed through him, but as the sensation intensified, the effects became clearer and clearer.

The tiger grinned behind him, finding the fox's paw and raising it upward. "Flex for me, foxy," he purred, and as Zev watched, the bicep seemed to swell from a small mound to the size of a baseball in moments. He let the tiger guide his arm up and down, a dazed expression on his face as he watched the bicep grow bigger and thicker with each flex until he was as thick as - if not thicker than - the tiger's own. He realized that he had begun panting a bit, his heart pounding in his chest as he felt his body growing and bulging all over.

The tiger's roaming paws weren't helping much either...or rather, they were. They felt amazing as they moved over him, and Zev wondered if this wasn't the sensitivity Kindle had been talking about. He flushed again as the tiger's hands found their way to the hem of his t-shirt and began to lift it slowly, revealing the fox's white belly. Zev had always been lean, and though he'd worked hard to build muscle, he'd always had more of a paunch than a six-pack. But as he watched, the mounds of muscle began to appear, pushing their way forward, what little fat there was disappearing around them. Kindle's paw stroked over them slowly, tracing ever one of the new ridges there until the fox shuddered beneath him.

But while his shirt was raised enough to see his abs, he could only feel his pecs and shoulders growing and stretching beneath the fabric, filling it slowly until it was stretched tightly. The tiger's paw disappeared beneath the shirt and began to knead his left pectoral slowly, fingers playing over the nipple, making the muscle twitch and pop. Zev laughed softly, a big grin finally cutting through his amazement. He had always seen bodybuilders, wrestlers, and the like making their chests bounce but he'd never been able to do it before. Now it seemed to come naturally as the muscles grew bigger and stronger.

The tiger's own soft purrs seemed a strong indication of how much he was enjoying the show as well, though he was very careful to keep everything but his paws from touching as he knelt behind the fox. Slowly, his paws trailed down the fox's pants, finding them near his paw and rolling each one up slowly. Zev noted with a grin that the elastic in the cuff was stretched rather tightly now as Kindle rolled them up over huge calves. The fox didn't need prompting to flex this time, smirking as the muscles moved under the tiger's paws.

Kindle kept going, rolling the sweats up as far as he could onto the fox's thighs, which wasn't far at this point. He chuckled and stood, grinning. "You're not fond of these are you?" he asked, tugging on the sweats.

"No...," Zev said curiously, and the tiger grinned and walked over to his bag, returning with a pair of scissors.

"The best way to show you off," he said, carefully bunching the material in his paws, "is to leave you in something a little more revealing." He focused all his attention on manipulating the scissors, cutting the sweats off along Zev's upper thigh, leaving his quads huge and mostly bare on each leg. He stood and admired his work, tail curling softly, then carefully took the shirt and clipped it just below the fox's pecs, leaving something of a half-shirt on him. "There," he chuckled. "Perfect. How do you feel?"

Zev grinned at the new look, laughing softly. "Incredible," he said. "The aching has gone away. And I look AMAZING!" He flexed in front of the mirror, watching his abs move, the muscles throughout his body bunching and curling. "I look like a statue," he chuckled, "all cut out and defined!" He slowly ran his paws over every curve, his paws stopping just short of his bulge. He flushed with embarrassment as he realized it was bigger now, too. Not only that, but he had a noticeable hard on. The cut-off sweats did little to protect his modesty, but if the tiger noticed, he didn't comment. Zev blushed harder as he resisted the urge to run his paws over it, so distracted that he didn't notice that the tiger had moved up behind him again.

"You can touch it," he said softly in the fox's ear and Zev nearly jumped, as the tiger's paws slid over him once more. "I know you're still feeling nervous and embarrassed," he said. "But it's just you and me here, and we'll be getting much more intimate as this trial goes on." He took the fox's paw in his own and Zev realized for the first time that he had grown bigger all over, his paws nearly as large as the tiger's, his head rising nearly as tall as Kindle's. Slowly, the tiger guided his paw over the bulge in the sweats until the fox trembled against him.

"I...I feel...," he started to say, but suddenly the room was spinning around him. Despite all his new muscle, he suddenly felt weak and exhausted, as though he could barely hold himself up.

Kindle caught him and held him up, muscles straining with the fox's increased weight, but voice calm and reassuring. "This is normal," he said. "You're body has just been through the equivalent of months of training in just under an hour." He kept his arms around Zev as he led him over to the couch, which groaned a bit under the fox's new size. Kindle knelt before him and watched Zev's face very carefully. "Can you speak?"

Zev nodded slowly, but the room spun as he did so. "Yes," he said, but he was breathless.

The tiger nodded and rose, going to the refrigerator and retrieving a small bottle of pink fluid. He opened it and held it up to the fox's muzzle for him to drink. Zev almost protested, but he could barely lift his arm even if he'd wanted to, so he opened his mouth and took the offered drink gratefully. It tasted of strawberries and it was strong, but the moment it hit is stomach he began to feel better. When the tiger tipped the bottle back enough to let him breath, he licked his lips and looked up at him. "What is this stuff?"

"It's a special concoction Foxfire came up with," the tiger explained. "It's supposed to help you recover much, much faster than a regular sports drink. I can't even begin to explain how it works," he chuckled, "but it does."

Zev flexed his arms and nodded in agreement. He felt almost one hundred percent better now. "Yeah," he said. "But I'm still a little stiff." He reached up and took the bottle from the tiger and finished it off.

"That's normal," the tiger repeated. "And I can help with that."

He knelt before the fox again, taking a dark-furred foot in hand and beginning to knead it slowly in his paws. "You don't have to...," Zev started to protest, but the complaint died on his lips and was replaced by a little 'ooo' of appreciation as the tiger's paws worked. Kindle chuckled and rubbed them slowly, hitting every pressure point as Zev's body relaxed above him.

With a mischievous grin, he brought the paw up slowly to his own muzzle and ran a long feline tongue over it. The fox's eyes widened and his tail fluffed a bit, as the tiger grinned up at him. "Hope you don't mind," he grinned. "It's a recent fascination of mine." Zev could almost see the blush beneath the tiger's fur as his ears slicked back, but Zev just smiled at him, and the tiger leaned in again to tickle his toes with that roving tongue.

He moved to the other paw and began to give it the same treatment as Zev tilted his head back, making soft sounds of pleasure as he relaxed into the tiger's care. He could almost feel the edges of sleep when the timer sounded again and the tiger's paws slapped his knee lightly. He opened his eyes to find the tiger grinning up at him from between his legs, thick tail curling behind him excitedly. "Ready for round 2?"