FSE

Furry search engine

formerly SoFurry search engine

This is a commission for Uen_kitsune (FurAffinity.net)

Warning: This story contains breast expansion, cock growth, giantess, macro, hyper dick.

Tiernan and Sylvia Gray belong to Uen_kitsune.

Alchemic Snu-Snu, by DragonMasterX.

Keystrokes sounded off with almost rhythmical frequency in a small college lab. Dawn had yet to manifest. Dr. Tiernan was laser focused in his work, documenting his experimental findings on his laptop. The counter he had pulled a stool in to work at was full of empty cans of energy drinks and paper cups from the college's coffee vending machine.

"A-043 showed initial promise, but unlike A-042 it didn't manifest the changes I'd been hoping for..." Tiernan murmured to himself, taking a small break from typing to rub his tired eyes. With a small yawn, he leaned an elbow over the counter, resting his cheek on his knuckles. Reaching over to a small glass box, he poked it with the butt of a pen, looking over his test subject with mild annoyance.

Inside the box was a generic plant genus, weeds which had been doused in a formula meant to promote rapid cellular growth and development in an organism. Tiernan had been hoping to acquire results sooner now that he was at the testing stage, but after more than three dozen lukewarm attempts, he was starting to grow worried.

"These are good enough results for me," Tiernan bargained, leaning back on his chair with a sigh. He stretched, rolling his shoulders and smacking his lips; anything to keep himself awake. "But the guys at the foundation will give me the boot if I don't give them something big..." he told himself, putting emphasis on the last word. After a pause, he looked around him. A mess of trash bags full of weeds labeled A-025 to A-042 was strewn around the laboratory. Some bags were fuller than others; all of his failures in the road to science. "...and stable." Tiernan finished.

Gathering resolve, he decided himself. "One more."

The red fox hopped off his stool, stretching his arms over his head. After dumping A-043 into a trash bag and labeling it, he washed the glass container before replacing the previous test subject with a new one. Applying the necessary sensors inside the terrarium, the plant was given only a little water. Tiernan double checked the lightbulb at the bottom of the box's lid, sliding over to his laptop to open a new tab on his document. "C'mon, A-044."

Tiernan mentally chastised himself for the mess of cans and paper cups on the counter as he shuffled to find the vial with his elixir which had become mixed up with all the junk. He finally found the flask with his liquid formula behind his laptop. The potion inside swirled in a fluorescent green color, bubbling up at the top. With the help of a pipette he recovered from that mess of cans and cups, Tiernan sucked out a bit of his elixir for administration, putting the flask back next to his laptop.

"Administering compound at..." he squinted tiredly, looking over at his laptop's clock, "...4:58a.m." Lightly squeezing the pipette's sucker, he began to douse his plant with the formula. Once he had made sure the roots had been properly fed, he finally closed the terrarium after flipping its light back on.

He pulled his stool in, sitting down to observe, a paw on his keyboard at the ready. "Need to wait two minutes before initial changes..." he began yawning again, bringing a flask to his mouth for much needed refreshment. But then his eyes widened and he nearly dropped what he was holding. His mouth snapped shut and he covered his face with a claw, gently putting the flask back down on the table. Tiernan had almost carelessly downed his own compound. "Jeez, that was close. I need some coffee," he admitted, but then corrected himself: "Or some sleep."

Before the minute since administration was up though, Tiernan began to hear some rustling. His attention shifted from his elixir to his test subject. The weed was starting to actively shudder, sprouting additional leaves that grew longer and healthy like in a time lapse video. Tiernan's ears splayed as his eyes bulged out. "This can't be. What kind of reaction is this...?" his heart began to race as he noticed the remarkable multiplication of leaves and their near-immediate growth.

Before the second minute was up, the terrarium had been mostly taken over by the enlarging plant. "Only A-006 gave me something like this, but this was _hours_after administration!" the scientist reminisced, his fingers becoming a flurry over his laptop as he recorded what he was witnessing. "It's the same genus as A-043. This can't be right. The compound is..." the fox took a pause, glancing at the pipette, then back at the little puddle on the counter to his left that he had missed. "You're kidding me. Ugh, I got the pipette contaminated with..." Lifting the tool up to his nose, Tiernan immediately noticed the sugary scent of his favorite energy drink.

But the results were there. Beyond Tiernan's tired grimace was a glint in his eyes. The glint of a successful scientist achieving his goals! "This is what I've been looking for...!" he celebrated in his head, rushing to document without tearing his eyes away from the filling terrarium. His subject had grown so large its vines and leaves had ended wrapped around the lightbulb on the box's ceiling, darkening its insides. The plant's expansion continued until the lid was finally pushed off.

"The stems and leaves look healthier than A-020, which reached half this mass and started drying like a prune!" Tiernan had begun comparing his test subject with all of his other failures, finding how it excelled at what the others had failed, and did better than his previously decent records. "Have I found the missing catalyst? Is it truly so simple? I've never been so excited in my life before!"

The fiery keystroking continued for another minute before it became less frequent, paused, calmer, and, inevitably, forceless. For all of Tiernan's excitement, the burst of energy he'd received from his passion could not supply him with the fuel 40 sleepless hours demanded. And so, little by little, his heavy eyelids pushed his eyes closed. He felt his consciousness gradually fading, and with a dry 'plop' his cheek hit the keyboard, arms hanging limp to his sides.

Tiernan finally came back to a few hours later, part of a towel stuck to his cheek. He pulled the towel off his muzzle, rubbing his groggy face with a paw. As his arms rubbed against it, he took note of his lab coat being draped over him like a blanket; Tiernan remembered having set his coat aside after school hours had ended the previous day. He didn't remember bundling up; he didn't remember using a folded towel as a pillow either.

Suddenly, all of his senses fired at once when a steaming cup of fresh coffee was firmly put down on the counter next to his laptop, which had been pushed away from him during his sleep. "Sylvia!" Tiernan stammered as he flinched, his ears standing up to attention. He followed the delicate, dark grey furred fingers on the coffee cup up a slender forearm whose fur brightened up to the shoulder and neck of his laboratory assistant, Sylvia Gray.

Sylvia was a fox just like Tiernan. Three inches shorter than Tiernan's 5'10, a tall girl by female standards. Long, silver strands of hair framed her pretty, round snout, the rest of her mane flowing beautifully to the middle of her back. Blue eyes that mirrored Tiernan's stared back at him with the aid of large, thick rimmed prescription eyeglasses.

The silver fox was wearing her own lab coat over her usual work attire: A plain, loose white blouse and a mousey, long plaid skirt conservatively hiding her knees. In spite of her slender build, Sylvia had a generously endowed body which she did her best at keeping hidden to avoid unwanted attention. Shy by nature, she avoided showing cleavage with every chance she got.

For a moment, Tiernan found himself staring without saying anything. His brain took a moment to collect the evidence until he could form the picture in his mind. He had fallen asleep while working, Sylvia had found him and covered him up like a baby; and that detail made his cheeks flush with color; and she had even fetched him a coffee, the darling girl. "You uh..." he stumbled over his own words, fangs baring into a silly, toothy-grin as he said: "Guh-good morning."

"I told you to go home and get some sleep, Tiernan," Sylvia let out a disappointed sigh, frowning and leaving his coffee on the counter. "This can't be healthy for you."

"I know." The red fox thanked his assistant for the coffee and took the first few revitalizing sips. He shuddered as the caffeine, but most immediately, the scent of coffee going up his nostrils, did their job. "Ooh, you're so good to me. What time..." he was about to ask, but seeing Sylvia go around the counter, he turned towards his laptop and pressed a key to look at the clock. 8:02; she had always been punctual. With a smirk at the trailing gibberish left by his cheek impacting on his keyboard before he fell asleep last night, he stepped away from the desk.

Coffee in paw, Tiernan followed Sylvia around as he caught her up to date with the experiments he'd done on his own.

"Wait," Sylvia put a paw over her mouth in surprise as she looked at the overtaken terrarium. The weed from before had grown so large it looked like a small jungle had grown all over a piece of glass. "Is that a single test subject?" the vixen adjusted her glasses while watching for Tiernan to nod in confirmation, "I thought you'd carelessly bundled all the subjects one over another."

Ouch, Tiernan was being accused of being sloppy. He wanted to say something in his defense, especially of how he had properly bagged up A-043 earlier, but then his memory showed him flashbacks of Sylvia disposing of all their failures after documentation had been finalized, by herself. He had been so laser-focused on experimentation that he'd forgotten how dutiful his assistant had been. If it weren't for Sylvia taking care of the paperwork being up to date, they would've lost their grant months before. Even though he knew she wasn't trying to be mean about, Tiernan chuckled and let her have her win. "It's one, I promise. And I'll tell you all about it... ahhh..."

Smiling, Sylvia looked up at Tiernan with both of her paws resting on her hips, "...after I take out all this waste, right?"

"We," Tiernan added, scratching his cheek with a finger while not making eye contact. "I uh, I mean I'd do it all myself. Right now. But with your help it'll take me half the time so if you don't mind..."

"Oh gosh," Sylvia's eyes rapidly blinked in surprise, "This is really it, isn't it? It must have been a serious development if you're actually going to help me take out the trash!"

Oof.

"I deserved that," Tiernan sheepishly grinned, slowly directing a pleading expression towards Sylvia. It didn't feel right for them to engage in project-changing scientific discussion while surrounded by bags of discarded weeds after all. "Please?"

"Hehe, I'm messing with you, Tiernan! Lighten up. If I was mad at you, that coffee would've been scalding," Sylvia poked her tongue out playfully, already crouching to grab a couple bags off the floor. "I'm super excited to hear about your findings! So let's take care of this quick."

With a relieved smile, Tiernan nodded and got to work. They still had time until after lunch time before the faculty would need the lab for that day's periods, but Tiernan wanted to make sure he kept it as clean and orderly as possible. Before he knew it, the lab had been filled up with bags that needed proper disposal.

Twenty minutes later, every test subject whose cycle had concluded had been put into the incinerator outside. Sylvia stretched a little after that work out, her lithe body having grown weary. "You didn't have to carry three at a time at the end there, y'know," Tiernan folded his arms as he reprimanded his aide.

"I'm really eager to see that presentation, what can I say?" Sylvia was speaking with sincerity, even if her tone was so jubilant. She let out a yawn that she immediately covered with a paw, "Sorry. Sorry. I guess I'm being a little hypocrite with the sleep-keeping."

"That new Netflix thriller?"

"The new Netflix- yeah... hehe," Sylvia giggled, Tiernan laughing with her. It was always easy to talk to her superior since they shared so many common interests. She didn't usually talk so casually with other people, but she didn't feel like she had to remain quiet around her boss.

"Sounds to me like you should've gotten yourself a coffee instead of me, Syl," Tiernan quipped.

"I had a couple energy drinks as I biked here," Sylvia shrugged her shoulders, closing an eye and smirking, "Don't think they work that well on me. But I have nothing on your caffeine addiction, doctor."

"Haha, very funny. You know I'm just pressured because showroom's in a week. I promise not to kill myself over it, though, you got my word!" He laughed and then put a hand over Sylvia's shoulder, "Really got to thank you for all the help. Don't think I... we would've made half the progress we have without you running things like you have. Couldn't have asked for a better partner, Sylvia."

Blushing a deep red, Sylvia's ears folded back and she took a step back. Her heart was aflutter with the compliments; he had even called her his partner! But she didn't have that level of confidence to accept those words of praise yet. Averting her gaze with a nervous smile, the vixen began to fidget and press her indexes together. "Um... you were about to show me your findings, ruh-right...?"

For a moment, the red fox considered he might have upset his assistant; and he understood her just fine since he wasn't exactly a shining example of a social butterfly. Positions aside, they were two equally awkward dorks. "Oh, right! Yes. It wouldn't do to hold a presentation out here though," Tiernan got on gear again, being pulled back from that awkward moment of silence and into science-mode. "Let's go back to the lab. We have much to discuss...!"

"And clean..." Sylvia murmured to herself bemusedly, looking over at the multitude of cans and paper cups still on the counter around Tiernan's laptop. She stood by the counter as Tiernan walked up to the blackboard and began erasing its previous scrawling before he rapidly started chalking up chemical formulae. The silver fox watched intently, elbows on the counter top and eyes fluttering as she watched the man she admired work.

"As per our basic assumptions..." Tiernan began to explain, tapping and underlining a long string of symbols that represented their compound, "We were led to believe the potency of our elixir was insufficient. But that, my dear, was not the case! As I found out last night, the introduction of a certain catalyst supplied our target organism with necessary nutrients which could be exploited in such a way that..."

Sylvia was hanging onto every word coming out of Tiernan's mouth, and she wanted to formulate her own theories to accompany his proposed ones, but even with all of his passion and all of her eagerness, she couldn't deny her own tiredness. Even though she didn't want to admit it, she had been running herself ragged for this project. And with the biking and exercise of carrying so many bags out of the lab and into the incinerator outside, Sylvia was feeling like taking an early morning nap more than ATP and accelerated cellular mitosis.

Worse still. Once Tiernan got talking, passion simply flowed through him. Instead of a reserved and shy nerd in a vest, he became a man of science she wished nothing but success on. Sylvia didn't dare interrupt him, but she didn't want to miss a beat on that discourse; even if it had to be a monologue because she was too tired to rebuke or add, she wanted to hear it!

As Tiernan turned around to erase part of one formula to edit it with new data, Sylvia's tired eyes floated down to the sea of blurry looking cans. "So much to clean..." she mumbled to herself, something occurring to her just then. "Maybe one of these has some left... Just a little pick me up." Without thinking too much, Sylvia grabbed one container after another, swishing them a little without even looking at them. After three cans, she found a weightier one she didn't even have to look at because of its weight. "Mmm, it's still fizzy..." she blamed herself for her slobby act as she took a hearty gulp, but all Sylvia wanted was to be part of Tiernan's discussion, not fall asleep on it!

Before she took another sip though, a rancid taste belatedly invaded Sylvia's taste buds. She frowned, finally taking her eyes off the blackboard to her paw as she looked straight down for a moment. "Odd, it's still fizzy and green, just how long has this energy drink..." her thoughts trailed off as she finally noticed she wasn't holding a can, but a flask. A very transparent flask that could let her see the very luminous green liquid she had just downed half of. "Oh... oh no."

"No! Exactly!" Tiernan lauded as he turned from the blackboard, ready to praise his assistant before he saw with the potion flask he had left beside his laptop earlier. For a moment, he wondered why Sylvia was so fixated upon the contents of the flask, only to notice two major discrepancies in that image. One: Half of the liquid had seemingly vanished up into thin air. And in relation to that, two: A green drop of luminous viridian was hanging off one of Sylvia's whiskers. The chalk dropped off Tiernan's paw as his heart sunk. "Sylvia!" he yelled without thinking.

The vixen who until now had been blank-minded about the whole ordeal was rudely brought back to the real world with a shocking vociferation of her name. Her arm spasmed and her grip loosened, letting the flask fall into the ground with a loud, glass-shattering smash. "Ahhh! Tiernan... doctor! Doctor I'm so sorry!"

Tiernan swallowed his breath. He hadn't meant to shout, but he couldn't hide his concern either. The chalk in his paw fell as he broke into a dash towards the counter, ignoring the mess on the floor. "Forget about it! Are you alright? You looked like..."

"I drank it!" Sylvia intercepted, eyes bulged out with tears gathering under them. "I didn't mean to, I don't know what I was thinking!"

"It's alright!" Tiernan said, unsure of himself. "It'll be alright," he gestured down with open hands, trying to slow his breathing and impart some semblance of calmness to the agitated Sylvia, "...probably."

"Probably?" Sylvia repeated, frowning behind her glasses, "What about definitely?!"

"What I mean is..." Tiernan started, this time bringing his hands up defensively, "...our compound was tailored for plant life. It shouldn't have any effect on your biology. And thinking back, none of the formula's components include anything that would be toxic to us. Furthermore..."

Sylvia interrupted him before he went on another fascinating theory, "Tuh-Tiernan...?"

"What? Does anything hurt?" Tiernan spoke fast, realizing he hadn't been paying attention to his assistant. When their blue eyes crossed, the red fox realized something was wrong. "You..." his jaw began to slack. They were both eye to eye. That meant Sylvia was a few inches taller than usual. "Oh dear."

"Nngh..." Sylvia closed an eye, clenching her fangs as she hugged herself as if trying to keep herself warm in a cold day. But she wasn't feeling cold; all to the contrary. "I feel... very warm. Is th-thu-this the compound...?"

"Warmth... if your metabolism is accelerating, that would explain it. But that... But that just means... the formula can affect us after all!" Tiernan grabbed his head with a hand, his worldview suddenly changing. "This is a groundbreaking scientific discovery...! We're in the cusp of..."

"TIERNAN!" Sylvia whimpered out helplessly, squeezing herself with her arms as if trying to contain herself. She was shuddering all over. Her clothes were starting to look tighter on her lithe, yet top-heavy form.

"Right! Right! I'm sorry, Sylvia. Ahh..." the red fox's mind raced. They had never bothered to manufacture an antigen this early in testing; and now that the compound had been absorbed into her system, Tiernan had no idea how to proceed. Before he could be sincere about his present cluelessness however, he heard Sylvia begin to moan.

"Ohhhh, so tiiiiight...!" the vixen said, feeling a swelling in her chest. The crawling inside of her had crept up from her midsection to her bust. Sylvia had always avoided the locker room while she was in high-school since that was where cheerleaders got to be the meanest to her. And things with them had never improved since the day puberty had seen fit to give her a huge pair of boobs just more than a handful, each. With her shy demeanor, Sylvia always strived to keep her physical attributes other than her pretty hair hidden. Unfortunately for her, her once loose blouse was starting to fully encompass her enlarging rack and giving Tiernan a pretty good view of her chest. "Nnngh...! Ahh! D-duh-don't look! Please!"

But the pleading simply fell upon deaf ears. Tiernan was utterly fascinated in every sense of the word with what he was seeing.

Poor Sylvia was at the mercy of this wild new sensation she was feeling. She couldn't move and the heat was only turning up inside of her. Her tits were tingling; she could feel them growing, stretching both the fabric of her blouse and filling out her bra cups with more mammary flesh than they had been built for.

To make matters worse for Sylvia's clothes, the rest of her body was following suit. Gradually gaining inches, she was soon approaching six foot tall. Indeed, she was already taller than Tiernan and the difference was only getting clearer by the second. "My God, how remarkable...!"

"Tiernan, please help, don't just stand there!" Sylvia whimpered, lifting her arms a little to try and hold her burgeoning bust back. But those boobs couldn't be held back. Her blouse was already riding up above her navel and the waistband of her skirt was beginning to fail.

Snapping out of his trance, the red fox could only nervously chuckle as he reached up to scratch his head. "I'd love to, Sylvia! But I uh... we don't have an antidote handy. I'm not sure how to help!"

Of course, Sylvia's brain didn't ignore the truth of the situation. She had been part of the project since day one and she knew they didn't have a way to reverse the effect of the potion. "I know, but I'm scared...! What do I do...?"

"For the time being, we must let the formula run its course," Tiernan explained, trying not to stare at the splitting blouse and surfacing, fluffy cleavage. "I'm here with you! I'm not going anywhere!" he assured.

"That's what worries me...!" Sylvia thought with an ever deepening blush as her rapidly developing chest jumped the bra alphabet and inevitably became too heavy for her bra straps. When she heard a loud snap, she let out a squeak and finally fell down to her knees. Her heavily straining blouse was preparing to bust open, her swelling boobs making way as they expanded. Fabric was torn to pieces by those ballooning chest pillows and soon, with an impactful shred, Sylvia's augmented tits bounced to freedom with an exploding blouse. The kickback made the vixen seize backwards as her snapped bra was hurled forwards like a projectile.

Smack! Tiernan was knocked down on his back by the broken unmentionables, face hidden under the cups of Sylvia's discarded bra.

"Ahh...! Tiernan! I'm sorry...!" Sylvia cutely whined, but could do little more than gasp as her melons-turned-basketballs weighed her down.

"I'm... I'm fine..." Tiernan had been fortunate enough to never be slapped across the face before, but now he was sure he didn't have to imagine what it might have felt like. His nose could pick up a faint, sweet smell while his face was buried under Sylvia's bra. It was her perfume. "These are fantastically big cups..." he murmured to himself, "For them to have outgrown their bra when she's only slowly growing larger... Hormonal!" he concluded out loud, raising an arm from the ground and pointing his index skyward, "Your estrogen and progesterone production must have spiked! It's..."

"Making my boobs huge, I get it, sheesh...!" Sylvia cried out exasperatedly, angrily shoving her paws up against her utterly massive breasts. Moving her arms felt like a chore now that her lab coat and the sleeves of her split blouse clung to her limbs so stubbornly. Shoving her head-dwarfing mammaries up, Sylvia could feel their softness against her chin but also their increased sensitivity. A sensitivity that made the touch feel good. "So... so huge..." she panted out.

Quietly sliding the bra off his face, Tiernan ventured to look forth. His cheeks flushed with color as he saw Sylvia holding her magnified breasts up with greater interest than he figured she'd have from her initial reaction. He felt like asking if she was feeling alright, but Tiernan couldn't help just losing himself in the picture before him. Kneeling, pinned back by her massive bust, her skirt turned short by her longer legs, her glasses crooked on her pretty face by all the sudden action. What a contrast with the usual, mousey Sylvia, he thought!

Sylvia couldn't believe how good her breasts felt. Their growth had slowed down to simply keep up with the rest of her swelling body, but she still couldn't keep her paws off them. Amidst the feeling of her tight outfit further incurring damage as it attempted to contain her, Sylvia estimated she was already well on her way to 6'6" and taller. Slowly, she got back up to her feet and, as she did, her skirt rid up over her thighs.

The shift in perspective and the additional weight up top toyed with her sense of balance. Sylvia's massive boobs bounced and wobbled as she let them go to support herself with the counter. She heard a crunch and looked down at a couple of those messy, empty cans getting effortlessly crushed under the weight of her hands. "I'm... much stronger because I'm bigger..." she murmured, taking her hands off the counter to glance at the compacted tin cans. Her tail began to swish behind her as she pondered this change.

"This isn't necessarily bad," the vixen began to rationalize as she brought an arm up for an experimental curl. Even though her biceps weren't notable, the tension in the lab coat's sleeves only worsened with that simple gesture, separating the sleeve's forearm from the rest at the elbow. "In fact, I could learn to like it...!"

The jumbo breasts had scared her, Sylvia confessed to herself. But she had never actually felt so good in her life! She started to realize how amazing the sound of fabric ripping around her growing body felt. As everything around her appeared to shrink, Sylvia felt greater and greater. Whereas she had felt afraid of her clothes shredding around her voluptuous form and leaving her increasingly taller body naked, she now welcomed the impending nudity. After all, there was only going to be more of her soon and holding back would have just been silly!

The waistband of both her skirt and panties were soon victims of Sylvia's growth. The clothes glided over her slender, long legs like silken cloth before joining her naked feet at the floor. Sylvia's tongue poked out gingerly as she blushed and aided herself in getting naked, shaking off the broken sleeve of her lab coat before tearing the other sleeve right off to match. She couldn't believe how easy it had come off! "I'm so strong now, I love it!"

Tiernan was speechless, barely able to sit up as he watched the seemingly less inhibited fox woman reveal more and more fur almost without the help of her continuous growth spurt. "She has to be seven feet tall, no, taller!" the red fox pulled on his shirt collar, feeling suffocated by the increasing arousal he was feeling.

And that arousal was certainly within Sylvia's sights. On any other day she would have been flustered and embarrassed at staring at the bulge of the man she admired. But right now, she felt proud because she knew she was the cause of it. And it wasn't just her breasts. It was her Amazonian height and her strength, also.

Smirking and finally taking her glasses off, dropping them at the counter, Sylvia began to trace a finger over her deepened cleavage. The simple, dragging motion seemed to send ripples over those impossibly firm, engorged, dark furred breasts. She brought the digit up to her lips, giving it a lick that made Tiernan visibly squirm.

And just at that moment, Sylvia's expansion finished off the rest of her clothes. Starting to come apart at the back, the top of her lab coat became tattered and was pulled off her body under its own weight. Brushing off the upper sleeves and the remains of her pitifully destroyed blouse, Sylvia was finally in the buff, and jigglier than ever. Leaning forwards, her breasts swung dangerously before knocking over each other, wobbling succulently. She rested her left knuckles on her hips as she dragged a paw over her thigh and stopped at her knee, shooting a lust-charged smile at Tiernan.

Those perky nipples were almost looking like they were staring down at Tiernan. He frankly had let his head bob with the bouncing knockers. Her unexpected confident smirk had managed to leave him speechless, without any witty remark available. "And she's still growing, oh God..." Tiernan had always entertained the fantasy of bigger women, but he had never expected his science project ending up turning his cute assistant into a sexy amazon! This was like some sort of wet dream come true. "Hold on. Am I still asleep...?" he asked out loud, pinching his cheek. "Ow!"

"Ow..." Sylvia followed, rubbing her cheek after having emulated her boss. "I guess neither of us is dreaming!" the vixen giggled.

Despite the goofy exchange, Tiernan felt at ease. With the way Sylvia had rapidly grown and gotten accustomed to her swelling power, he had to admit he had begun feeling quite apprehensive. Until Tiernan saw her poking her tongue out at him like she usually did when doing something silly, he had actually started feeling like the Sylvia he knew had gone, replaced by this sexual being of pure femininity. He was turned on, of course, but Tiernan couldn't help feeling intimidated by the way she was looming over him! It still was her. A much larger, generously endowed, yet no doubt cute Sylvia.

The vixen's curvaceous body type didn't have much on the likes of muscle tonality, but she did take care of herself with biking instead of driving cars. As a result, she had strong, plump thighs and sturdy looking, yet indubitably feminine legs. Going up from her wide hips, her waist narrowed and then flared up at her prodigious bust, now magnified to globes of flesh each larger than their owner's head. Soft, pink nipples capped the massive breasts, areolae as wide as platters making them look inviting. She was lean, and yet with her continuously rising height, she truly looked like she was some sort of powerful divinity.

"Beautiful..." Tiernan breathed out, catching Sylvia by surprise. Their faces were both red like tomatoes. He had said that, and she had heard it. For a moment, the confident vixen felt vulnerable even though she could've pinned Tiernan down underfoot at any time. Even though she had come to love the new her as she got used to the new feelings and her swelling proportions, that kind of euphoria had nothing on the joy her heart was feeling right now.

"He thinks I'm beautiful...! He really does!" Sylvia grinned, inadvertently resting her elbows down against her breasts as she held her face in delight. She felt encouraged, happy, bursting with energy even! With a shudder, her body broke 10ft. tall, her hips knocking on the counter during their ascent, bending the metal back. "Oops! I-I'm still growing... Mmm!"

It was hard to tell whether Sylvia was concerned or eager anymore. Tiernan wasn't seeing anything but delight and hunger in the vixen's blue eyes. Her usually reserved and measured body language had turned clunky yet sensual.

"Tiernan could you... stand up, please?" Sylvia took a few steps forwards, her shadow utterly covering the red fox as she loomed.

"Oh! Uhh... y-yuh-yeah! Of course." Tiernan could feel the weight of his hardened member painfully stretching his underwear. As he planted his feet down, he made sure to shift to the side to make his bulge less obvious, his legs quaking as he gradually stood up. "It's still Sylvia..." he told himself, forcing a big smile that turned into a mousey stare as he finally took in that growing vixen's size. He was used to having to tilt his head forwards a little in order to talk to the slightly shorter Sylvia. But now he had to crane his neck back in order to look past that bountiful bosom and be able to find her face when they were both standing so close to each other. Again, he was speechless.

Sylvia was positively beaming. Tiernan looked so small next to her, and her rumbling body was only making it clear to her that before she was done he was going to look a lot smaller. "Look at me, Tiernan! Your formula's a success! It's made me so huge!"

With the size difference made clearer than ever, Tiernan understood Sylvia had been looking to properly compare herself to a person of regular size. "Even now you're experimenting."

"We're still in a lab, aren't we?" Sylvia giggled. Her arms reached down, pulling Tiernan up by the waist as if she was picking up a toddler. "And even though I was scared at first, I'm feeling right at home with all of this now!"

Tiernan couldn't help but blush, ears splaying back. Her grip was firm around his waist, yet Sylvia's fingers still applied force in a dainty way expected of someone like her. His tail anxiously wagged behind him as he felt most of his upper body brushing along his assistant's immense bust, his concealed junk throbbing in his pants. But it was more than the physical contact. Tiernan couldn't say he remembered ever being manhandled before. And now it was happening not with a wrestler, or a bully, but with his smoking hot lab assistant.

On one hand, the fox scientist felt scared with his feet dangling three feet off the ground. On the other though, everything about Sylvia's confident, almost smug expression elicited arousal in him. "I'm scaroused..." he told himself with a mental laugh and a goofy grin he couldn't hide from the sensual Sylvia.

The growing amazon was rapidly enlarging even now. Sylvia was already twelve feet tall and without sign of slowing down. Tiernan was getting lighter in her grip, and soon all she needed was one hand to keep him aloft. "Look, Tiernan! My muscles haven't developed, but I'm still getting stronger the bigger I get! I bet I'll be able to toss you up into the air soon!"

Tiernan managed to hiccup his sentence out, "Uhh... please don't do that!"

"Kidding!" Sylvia giggled before wincing and ducking, "Oww! What the? Oh gosh..." the vixen glanced up with a shocked expression. She had been having so much fun that it took her banging her head against the ceiling to realize she was starting to run out of room in the lab. Kneeling back down, Sylvia gasped at the realization she was soon going to outgrow the lab if her expansion didn't slow down.

"Tiernan?" she decided to consult, but without getting an immediate reply she looked down only to find her boss stuck neck-deep in-between her cleavage. Her boobs quaked and wobbled with his struggling, her paw at his back making it impossible for him to free himself. "Ah! Tiernan, I'm sorry!" she squeaked, pulling him out from between her behemoth pair. "Are you alright...?"

The red fox's short dark brown hair was looking shaggier than usual. Tiernan panted, "I just... almost suffocated..." he murmured to himself while wondering who would believe the story of him going unconscious between a giant pair of tits. "I'm..." he breathed out calmly, inhaled and patted Sylvia on the paw to be put back on the ground. With his feet back on terra firma, the fox thought fast. "Alright, I said we have to ride this out, but we can't have you getting stuck inside the lab, too big to move. I have an idea!"

"Yes?!" the thirteen feet tall Sylvia looked hopeful, still shuddering and swelling which made Tiernan stammer.

"We-we-uh... we move you someplace else. You can still fit through the double door exit if you crawl, right?" Tiernan asked. Sylvia paused, quickly stole a glance left and then nodded. "Alright..." he looked at his phone, confirming the time. Still morning, but classes had already begun. The red fox hurried to the lab's exit and peeked out: Empty corridors, perfect. "We still got some time before first period ends. You'll crawl your way over to the gymnasium. It has plenty of room to let you grow in and I can cash in a favor with one of the faculty members to keep it closed for a while today. You know how to get to the gym, right?"

"Right! Thank you!" Sylvia nuzzled Tiernan's neck from behind with an affectionate smile. "It's empty, right? I'll go ahead. You cover my escape, alright?"

Tiernan could feel Sylvia's hot breath as her maw hung over him. There it was again: The contrasting sensation. He only had to look up to see Sylvia's large fangs above his head and when he looked down he saw that wall of tit flesh he could've just laid back on. With the way she was crawling, her massive rack stuck out that much more.

"Tiernan?"

"Right! Rightrightright...! Please go. Before you grow too big to get out of here!" the fox exclaimed, pulling the double doors open as he stepped out of the way for his massive assistant. She wasted no time, on the verge of enlarging past 14ft. tall as she began to crawl out of the lab. It was quite a sight to behold: Those curves were hard to ignore as it was, but with the silver vixen at this ludicrous height every nuance of her femininity was further magnified for his lustful eyes.

Sylvia allowed herself a quick furtive look left and right into the corridors before she started her trek towards the gym. Fortunately, she hadn't grown so large the halls boxed in yet, and she gauged she could probably get up to her feet and crouch her way forwards. "But at the rate I'm growing, I'll just bang my head on the ceiling again. I better crawl faster...!"

Because of Sylvia's decision, what Tiernan had ahead of him was the thickest bottom he ever had the pleasure of escorting. He couldn't have been more flustered! Every time Sylvia's bushy tail so much as swayed out of the way, Tiernan saw it all. His assistant's privates framed by the back of her gorgeous thighs. The contour of Sylvia's curvy rump. And also, more curiously, a peculiar fur pattern darkening the silver coat at the innings of each of the vixen's buttocks; resulting in the formation of a love-heart shape.

The trek to the gymnasium had only a single turn. It was while taking that corner that Sylvia had a moment to look sideways and realize Tiernan was pacing backwards towards her now. Even though she couldn't see his face, she could practically feel the sexual tension. "Who can blame him?" she thought with a discreet smile, "I'm literally the biggest bombshell in this campus...!" Sylvia stopped. "Did I... did I just think that...?" she asked herself, wondering where this unusual burst of confidence had come from. "Come to think of it, I've been flashing my boobs at Tiernan all this time without batting an eye! What's going on with me? It's almost like..." her train of thought derailed as she felt pressure at her backside.

When Sylvia looked back, her once confident smirk turned into a blushing, sheepish grin as she found Tiernan snugly wedged in-between her colossal ass cheeks. "You're an eager big boy, aren't you...?" she huskily asked, her voice dripping with sexuality. Tiernan flinched and launched himself forwards with one massive stride.

"Ahhh! I'm sorry! I wasn't looking, I was looking at your behind... I mean behind you! Behind you!" the male fox pulled his ears down to blind himself, laughing nervously to himself. "Um... is everything alright, why did you stop?"

"Mmm..." Sylvia was beginning to understand why thongs were so popular. Tiernan could only see her butt and he was more bashful than a horny teenager! She still had doubts whether it was her saying the words she was speaking, but something started making absolute sense for her: This was her chance to act on the feelings she'd kept repressed for so long. "My knees are scraping on the floor, I just needed a little rest. We're almost there."

They were just a short distance away from the gym now.

The university's gymnasium was a truly impressive space. Sixty by sixty with a three story ceiling, its court was a host for many entertaining games of basketball, volleyball and even martial arts with four level grades on both sides. Right now, the empty court was serving as a 15ft. tall mini-giantess' podium where she was waiting for her boss to return from his errand.

Fortunately for Tiernan, he was on good terms with most of the people in the faculty office and his friend working there owed him a favor; but he was also lucky the only ones that needed the gym today, the karate team, were out competing. He didn't have to pull many strings to get the keys to the gym for a "private follow-up experiment" special circumstance.

All the running around had almost knocked the wind out of him. As he passed by the bathrooms on his way back to the gym, he caught his scruffy appearance in the reflection of one of the mirrors. He hastily fixed his hair and brushed his short goatee, but decided it was too hot to keep wearing his vest. He took it off, bundled it neatly and carried it under his arm, unbuttoning the top of his shirt to allow some air in and out. "Too hot..." he repeated in his head as he sighed, images of his curvaceous, massive assistant invading his mind. Tiernan bit on the inside of his cheek to dispel the lust. "With all this bumbling, Sylvia must think I'm a pathetic pervert. I got to be there for her!" he told himself.

When he got back from locking up for them to remain undisturbed, the red fox found himself stopping at the corner of the spectator seats. Looking out at the center, he saw her in all of her bare glory. A foxy Venus de Milo, a titanic version of her.

Sylvia had grown an entire foot and some change in the short minutes he had left to go pick up the keys to the gym. She was still standing, appearing to be grooming herself in a most alluring fashion. The giant silver fox didn't have to do much to be alluring at this point. Her nonchalant nudity added to the way she stretched her limbs and gently brush her fur, dark at the forelimbs and light going up. More dark patches of fur went down from her muzzle to her neck and then continuing over her immense chest, belly and underbelly. Amidst all that dark gray fluff on her tremendous chest, Sylvia's pink nipples stood out, rigid thanks to the earlier friction, yet soft-looking to the eye.

Tiernan still couldn't believe how immense Sylvia was. It really, truly hit him when he noticed that at his sub six feet tall height, he was only eye-level with her thighs, if that! If she wanted to, she could make him disappear in her bushy tail. And part of him wondered how long it was going to be until her feet could crush cars underneath her soles. The idea, again, scaroused him; he was still shaken from the way she had spoken to him early; the air of a temptress carrying her voice.

"It's rude to just stare, Tiernan." Sylvia purred as she traced a finger down from her shoulder to the tip of her outstretched digits in her other paw. In what appeared to be Sylvia exploring her own body, she looked like she was taking a rainless shower.

Busted. He gulped. What had he been thinking? Pretending he could hide and voyeur when he had audibly locked the door behind him. "Sorry..." he mumbled, but shook his head and came out, raising his voice, "Sorry! Yeah. I just got back from the faculty office. It's all good now! We shouldn't get bothered for a while..."

"No prying eyes?" Sylvia daintily rested a hand on her chest and another on her hips, cocking the latter to the side as her tail swished behind her. "No..." she spoke with a slow, sultry tone as her tail approached Tiernan and began to tickle under his chin, "...interruptions?"

Dropping his bundled vest as he flinched, Tiernan's muzzle began to tremble. He had to fight not to stare at his assistant's genitals or her huge tits, even though his eyes continued to wander on seemingly on their own. What had happened to his shy assistant? "Y-you don't seem to ahh... be growing so fast now. Huh-how are you feeling right now, Sylvia...?"

Biting her lips, Sylvia slid her paws down to her knees and bent over. Her truly gargantuan breasts swung forth, stopped by her arms pressing them together. Boobs a fair amount of sizes larger than Tiernan's head jiggled firmly in front of his face, "Hot 'n bothered, Doctor."

"Y-you-you uh..." Tiernan began to shake visibly, her tail strong enough to slide him closer and closer until he was, again, trapped in fluffy cleavage, "...mmmph...!" he became muffled, forced to push himself away to look up at the lustful vixen. He wasn't faring any different, the bulge at his groin returning with a vengeance. "You don't say...?" his smile was shaky. He wasn't going to last much longer with his façade.

"Mmhm," the fox girl briefly reached up, pulling some of her hair back while trying to look as inviting as possible with as much eyelash fluttering as she could get in. One glance at Tiernan's crotch made Sylvia was convinced she didn't need to make the effort though. "I can still feel myself getting bigger. And this is such a rare opportunity, Tiernan. Have you ever been with a woman this big?" He shook his head no exactly half a second after she asked. "Well, I've never been with a man this small!" she giggled a little. Tiernan wondered how such an openly humiliating remark could sound like such a sweet invitation. "So, let's see where we can take all of this, mmm...?" she sang out, slowly dropping to her knees.

And through the wobbling of his weakened legs and his self-preserving brain screaming at him to run, Tiernan put his hands up. With sudden clarity and strength, he firmly held his surprised assistant's muzzle still, using her descending momentum to allow himself to pull her in. And right then and there, the two scientists kissed.

Contrasting her overtly sexual new persona, Sylvia was steaming at the ears. "Oh God, he kissed me! He's kissing me...! His mouth is so tiny, but I can feel it on my lips...! Do I let him take the lead? Does he want to take it? Oh my... this is like a dream...!"

"She's massive. So gorgeous, so powerful and sexy..." Tiernan thought as his mouth worked over the much larger one. It was a fool's errand to attempt to make out with their size difference, but he saw no better way to convey his agreement on Sylvia's take on the situation.

Before they knew it, the foxes were submerged in a lake of passion, swimming through latent romantic feelings which were leading them to fulfillment and oneness. For Sylvia, who had discarded her bashfulness, and for Tiernan, who didn't have to hold back any longer, that kiss had signified a new step in their rapidly evolving relationship.

As they kissed with their eyes closed, Tiernan finished unbuttoning the rest of his shirt before he discarded it. He was fairly toned but lean like most vulpine. Moving onto his belt next, Tiernan received aid from his lover, who easily snapped it off him with a single finger. That same finger hooked onto Tiernan's beige pants, pulling them down alongside his striped boxers. Once he had joined Sylvia in nudity, they finally separated from the kiss.

Leaning back to her 16ft. tall height, the blushing Sylvia put a hand on her cheek as she scanned Tiernan from head to toe, giving pause at his privates. The sheath was open and his organ was out, turgid and throbbing. "Tiernan, gosh! I had no idea you were so hung...!"

It was a good stroke towards his ego to be told that with such sincerity, but Tiernan couldn't help blushing as he was called hung for roughly eight inches of meat by a woman who would need a foot or more to properly feel insertion. She didn't appear concerned with that thought, however.

Sylvia was, instead, enamored with the idea that she wasn't the only naked person anymore. And with Tiernan available, she could finally begin tending to the raging fire in her loins. Again, her voice dropped a few husky notes as she began to lean down and crawl over Tiernan, practically bowling him over with her breasts. "Don't worry. I'm... going... to... take... good... care... of... you!" she paused at each word, boldly walking her large fingers over the sides of his body as her immense chest smothered him.

Tiernan saw himself disappear under tits again, only a fraction of his chest and shoulders visible to him. "Nngh... please be gentle..." he shivered, feeling his erection trapped at the underside of Sylvia's cleavage.

"I wouldn't dare to harm my precious little toy!" Sylvia giggled, making Tiernan visibly squirm. "Aww, don't give me that look. You know I'm just being playful, Tierny...! Now just relax as I make you feel good."

Relaxation was difficult for Tiernan at first. He was amazed that Sylvia had this much control of her body already, delivering just the right amount of pressure to his smothered body instead of hopelessly crushing him under her much heavier body. He could feel her gradual growth causing her mammaries to constantly be spreading over him; she was 17ft. tall and he just knew he'd inevitably end buried under her boobs.

But Sylvia, although enraptured by the wild sensations ravishing her body, managed to maintain control. The chaos that her expansion represented for her psyche was tempered by her affection for that small man; she wasn't going to allow herself to harm a strand of fur on his body. In a display of incredible restraint, the giant vixen slipped her indexes and thumbs between their bodies. Sliding her hands underneath her boobs she used her left forearm as a buffer to keep the ever increasing weight of her tits off Tiernan without removing their physical presence from smothering him. In the meantime, he right hand felt around, pressing her fingers over his thighs.

"Nngh..." Tiernan squeezed his eyes shut. He appreciated being relieved of all that extra weight, but immediately realized just how strong even Sylvia's fingers were when he felt his pelvis being compacted, muscles straining to resist the pressure. He couldn't help but wince.

With a little frown, Sylvia mentally chastised herself. Of course she had fumbled her first attempt! "Just a little gentler..." she encouraged herself, releasing tactile pressure until she was practically gliding her digits over Tiernan's hips to stimulate him. When his gaze began to soften, she knew she had hit the sweet spot. With renewed confidence, Sylvia began to stroke her fingers over Tiernan's junk.

"Ahh... Suh-Sylvia..." Tiernan trembled, failing to arch his back completely thanks to those ever present fluffy dark boobs on top of him. With his arms pinned back, he was feeling a great deal of frustration that he could only relieve by applying pressure with his own paws. His fingers each sank into way more flesh than he could properly grope, but he still grabbed, squeezed and fondled the giant tits like a pair of oversized stress-relief beach balls.

"Mmm!" moaned the vixen, surprised at the sensitivity of her chest in spite of how hefty it was for someone as small as Tiernan. She wondered if his arousal was granting him strength or if her tits swelling this huge had truly made them more receptive. "That feels good, Tierny. My huge boobs feel good all around you, don't they?"

"They're heavy but..." Tiernan gasped as he felt a little squeeze around his genitals; he thanked God she hadn't included his balls in that little pinch, "...soft!" his voice cracked at the end. The red fox was throbbing, his dick practically smacking Sylvia's fingers, telling her to continue.

She replied in kind, stroking her large fingers over that big fox dick, batting it between the tip of her thumb and index as if she was gently polishing a marble. His moans of delight and harsher squeezes to her bust convinced Sylvia she was doing a good job. "I guess I never gave you much for me to know if you were a breast man. It's funny..." she grinned, rocking her body forwards and gently sweeping her immense chest over Tiernan's entire being before pulling back, "I've always been embarrassed of the girls because of how big they are. And now that they're even bigger mmm... I feel like I could just stick you in-between them just to hear how much you like them all day!"

"Oh God. I love them, Sylvia! They're so huge, so soft and firm... Swimsuit models have nothing on you, my dear!" Tiernan voiced out loud. He thought he could remain civil and tasteful, holding his naughty side for the sake of that fluffy goddess; but her teasing was too much. "I always wondered why you didn't show off more. Even without the extra size your body is incredible! I... nnghh... my dick feels like it's about to burst!"

"Oh my! Mhmhm..." sultry little laughs tickled at Tiernan's arousal. "You're such a good listener. You want to please me, don't you?" Sylvia stroked him off faster with her growing fingers, soon a simple thumb-over being more than enough to make that twitching meat rejoice. "But I want to please you first, Tierny. You've always been so nice to me, and even though I accidentally turned myself into your biggest, sexiest experiment, you've been nothing but a gentleman. I think I can reward such a thoughtful man..."

"Ruh-reward...?" Tiernan's heart was conquered even before Sylvia did anything. Her honeyed words had been more than enough but he would be lying to himself if he said he wasn't curious about her meaning. His eyes glanced up at that 18ft. tall vixen as she predatorily licked her chops while pulling herself back.

"I'm feeling so hot, Doctor. So so hot." Sylvia cooed as she knelt down again. She rolled a hand underneath one of her breasts before pinching her nipples, and used her other hand's fingers to spread open her vulva, presenting her swollen pussy lips to her lover. Auto-stimulation drew out a moan which made Tiernan's legs twitch. "Look at my fingers up here, Tierny..."

Tiernan looked up, noticing the smallest hint of light being reflected on Sylvia's nipple and her thumb. The inner part of her areola was glossy and a thin strand of sticky fluid connected her nails to her nipple. "Oh G-Guh-God..." he shivered, looking down at his pre-seminal discharge running down his shaft before watching Sylvia lean in to lick the comparatively small amount off her nail. As if that wasn't enough to nearly set him off, Sylvia groped at her breast and pulled it up, opening her petite vixen mouth over that large nipple, sticking it inside. She suckled at herself for a few moments while pressing a couple fingers inside of her temple, bringing them up to tenderly scratch at her own, pulsing clitoris bulb.

The red fox was about to explode. Tiernan grunted and brought his hands down on himself, eager to cum but somehow held on, squeezing his shaft still.

"Is my show too much?" the vixen spat her nipple out with half-lidded eyes and an expression dripping with sex. Her tongue flicked at the thin strand of saliva connecting her lips and her nipple, which she had left spotless after getting it wet with his pre. "This is making me thirsty."

Tiernan had no comeback. His dick would've liked him to shout at her to come choke on it; but he knew he was hardly equipped for that right now. And even though neither fox had access to telepathy, Sylvia appeared connected with the idea.

"Let me... make you feel amazing."

With a sweeping grab, Tiernan was again captured. Sylvia didn't even bother to change her position other than relaxing her legs and sitting back on her gloriously massive behind. He estimated her being 20ft. tall if not larger, and with the way her huge hand was ever so subtly vibrating around him, he knew she still had some more size to attain. "G-God, Sylvia. You're the amazing one. I had no idea you were this... this..."

"Sexual? I'm not," Sylvia grinned, leaning in to cover his face in a quick smooch before she reached up with her wet paw to part her humongous breasts to the side, opening her cavernous cleavage which enabled him to see her chest proper. He could smell the strong, sweet scent of Sylvia's arousal coming from the hand which had been playing with her cunt.

"I suspect all of this growing has wreaked havoc with my endocrine system."

"Nngh... a reasonable conclusion. Side effect of the inevitable biological stimuli..." Tiernan thought out loud with his raging hard on begging for attention.

"And I'd love for us to write a paper on it... much later!" Sylvia lodged Tiernan's legs down towards her chest, letting go of her breasts. The red fox felt almost his entire lower body disappear in tit valley, yet his member was still exposed, pointing up. "Are you comfortable, Tierny?"

What was he supposed to say? He had never before sat down on a giant rack! But it felt undeniably good. "S-suh-soft seats... very, very comfy!" he stammered, involuntarily leaning back and exposing his penis at that vixen's giant face. His brain raced as those huge blue eyes stared down at him and she offered him a sweet smile: "God, she could chomp my head off if she wanted to... but instead she... she just wants to..."

"Good."

Her face closed in. Her muzzled pushed down. Her maw opened, revealing teeth larger than a feral orca whale's. And then, when her lips closed around Tiernan's entire equipment, balls and all, he realized what Heaven was truly like. "Ahhh... FUCK!"

"Mmm...!" closing her eyes, Sylvia brought her tongue forth inside her mouth to poke at Tiernan's relatively tiny dick, brushing the meat as her lips sucked on his whole package. In order to keep him still, she pressed her elbows against the side of her chest, squishing her tits together just tightly enough to hold Tiernan in place.

He felt the pressure around his legs increasing, but the softness of that fluff and the malleability of her boob flesh was just shy of being uncomfortable for Tiernan. Instead, he felt the all-encompassing warmth give his legs a pleasant experience while he thrashed his head around with sheer abandon. He had no need for extra grip, but in his deep arousal all his hands wanted was to squeeze something. Tiernan smacked his palms down, groping and fondling what he could of those monstrous tits with his pitiful strength. The suction was driving him crazy. "Gahh! Nnghhaaah...! Fuck. I'm gonna blow... I'm gonna blow, gonna come...!"

"Do it! Come inside my mouth!" Sylvia cheered on in her mind. Her own heavy state of arousal led her to use both hands to play with herself. One hand groped at her plump thighs while the other resumed relentlessly fingering her love tunnel's entrance. With the way she had teased Tiernan, Sylvia was surprised it hadn't already happened, so she was pleased when three minutes since sticking him up in her cleavage, a desperate growl of arousal led to a considerable amount of semen being deposited inside of the giantess' mouth.

"Nnghhaaaaaaaa...!" Tiernan arched his back, feeling himself sink inside of those growing boobs as he released in spurts of fox seed. Sylvia greedily slurped it all down like a quick, tiny shot, immediately releasing Tiernan's captive junk with a noisy, wet pop once he was done. "Guh... fuck, Sylvia, that was... nnghh..." he panted, feeling his dick still throbbing, getting hotter and hotter as it dripped with her saliva.

"That was... delicious, Tiernan..." Sylvia sensuously licked her lips, still a-ways from her own orgasm, but the sight of her pleased lover was reward enough for her. "Was that... satisfactory?" she poked her tongue out, still trying to play coy as she shot him another cute wink.

"Still..." Tiernan was still panting even after a minute of rest. He was hunched over, hands sunk on Sylvia's jiggly breasts. "Still horny..."

"Hmm?" Preciously silky and bright silver hair swung to the side as Sylvia cocked her head with a curious expression. "Tierny?" she stopped relaxed her arms, realizing she'd grown large enough that she'd have to make drastic moves to knock him off her tits.

"So horny." The fox moaned, eyes crossing as his hands squeezed Sylvia's tits again. His tongue lolled out as his hips seemed to move on their own, brushing his swollen, fluffy nuts over her cleavage. "Dick's still hard, Sylvia. It's... nngh... still... HARD."

Unsure of what was happening, Sylvia dried her juicy right hand over her thigh, bringing it up in an attempt to grab the heavily aroused Tiernan. She stopped herself when she, indeed, noticed that the fox's meat, which had ejaculated, hadn't gone soft as it was supposed to. Furthermore, that throbbing sausage was looking mighty engorged. "No..." she squinted her eyes, a shocked gasp escaping her mouth. "It's bigger...!"

Tiernan let out a groan of bliss. Every pleasure center connected to his cock was crying out at once, his rod hot to the touch as it heavily bobbed in the air. "F-fuck! It feels so heavy, Sylvia. My balls are growing too. What's happening to me?"

Having gone through a fair amount of growing in the past hour, Sylvia wanted to give Tiernan an answer, but the odd thing was she wasn't noticing anything but the male's genitals swelling. His cock was already ten inches long and his testes had swollen to the size of golf balls, stretching his scrotum to uncanny tautness. "I... I'm not sure! It looks like it's just your dick getting bigger!"

With every passing second, Tiernan could feel his meat lengthening and thickening, becoming a huge version of its usual self. His balls began to rest against his thighs as they continued to inflate like a pair of fluffy balloons, filling up with a new, augmented load thanks to their increasing capacity. "Getting so big! Fuck. This won't fit in any pants...!" he cried out as his cock went past the foot mark in length, attaining a three-inch girth that could have put any equine rod to shame.

"Wuh-welcome to my world..." Sylvia was the one stammering now even though she wanted to be snarky. She now understood Tiernan's unease from earlier. Feeling her body grow was one thing, but watching somebody else go through it didn't spare her from any pleasure. It was almost like she could feel those delicious growing pains alongside Tiernan, and his preciously confused face was the icing on that proverbial cake.

"But how could this happen?" said Tiernan, barely able to get a hand around his thickening shaft as it went past four inches wide, his cock already a foot and a half long. "I didn't take any of the elixir. This is impossible...!" he said, holding up his massive growing member with a huff. The heftier it became, the more worried he got. His balls were now as big as a pair of volleyballs and both he and Sylvia could perfectly hear audible sloshing coming from them. "S-suh-so big...!"

"So... big...!" Sylvia repeated almost as if in a trance. What a delightful sight that huge fox dick was turning to be. It was growing just as fast as she was, no, faster! Sylvia was already 25ft. tall by the time Tiernan had broken the two-foot mark in length, his cock making liter water bottles look thin.

Tiernan couldn't even wrap his paw around his shaft anymore. He needed both hands to even properly be able to lift his humongous erection, since it sagged under its own weight. As the shaft shone with a renewed bath of excessive pre, he recalled the shine on Sylvia's nipple and later on his own shaft moments before the expansion had begun. "It can't be... But could it be... your... saliva?"

"H-uh...?" Sylvia appeared to flinch as if coming off a trance. "Y-yeah, big dicks. I mean, your big dick got bigger because... huh? Because I gave you a blowjob?" she covered her mouth with a hand, ears standing at attention. "Oh gosh! Some residual amount must've been left inside. I must've poured it in by accident when you... finished... oh dear..."

"Oh God... it's still going... nnghh...!" Tiernan could barely hold on to his sanity. Coming to his conclusion had been an ordeal in its own right. His gargantuan cock was pouring out pints of pre, soaking his lover's cleavage in musky goodness. "H-huh-how big is it going to get, damnit...?! I could fuck a feral elephant unconscious at this point!"

"Why an elephant..." Sylvia laughed, gently scooping the shivering Tiernan off her messy cleavage before depositing him back on the floor. The court was immediately soaked with fox prenut, giving the wooden floor an unexpected waxing whose smell would linger for quite a while it seemed, "...when you have a much sexier alternative?" she smiled.

Struggling to remain on his feet, Tiernan felt like it was taking all of his upper body strength to keep his 30-inch monster up in his arms. His balls were now so big they looked like overripe melons; surely able to fill up Sylvia's old bras by themselves. The amusing mental image gave Tiernan much needed comic relief, his heart racing with the improbable amount of blood rushing to his erection of titanic proportions. "You... you want me to... with this thing...?!"

"Why not, stud?" Sylvia purred, sitting back while pulling her legs around him before spreading them invitingly. "I made you feel good, didn't I? Isn't it time you... returned the favor?"

"Oh God... you must be getting close to three stories high, Sylvia..." Tiernan shook all over. He was feeling no fear this time, only pure, unadultered arousal. The colossal dick attached to his groin was making him approach her gaping pussy as she toyed with her own breasts.

"And my giant pussy has need of giant fox cock, Doctor," she huskily said, smashing her tits together for him to see. Tiernan squirmed, spurting a bucketful of pre straight into her womanhood then and there. "And I think you don't have a choice at this point. Make me scream, you big boy!"

There was no choice. Between his eager lover and his titanic cock, Tiernan truly felt embraced and controlled by his own primal desires. Before he knew it, his paws were already groping at Sylvia's massive thighs, further pushing her legs out into a wider spread as he positioned the hefty hole-stretching tool onto her mons pubis for support. "So many variables to consider. So many tests to run. We shouldn't be doing this..." he smiled, lips trembling as his rational thoughts were torn down by the needs of his tremendous cock.

Likewise, Sylvia wasn't one bit concerned by sex between them potentially making things worse. All she wanted was to get brought to orgasm. She was so close already and he hadn't even gone in. "Tiernan, come in!"

"What if I hurt you?"

"You won't! I'm massive! Way stronger than you. Now fuck me like a whore, already!"

"G-god..."

It took all of his pelvic strength once Tiernan pulled back to line himself up. His knees buckled and he briefly lost his balance, gripping the giantess' thighs for support. This was straight out of his wildest fantasies. His fox dick was really going in there, to please his giant lover. No, he was the only one capable of satisfying Sylvia now. There was no need to hesitate. "Going in!" was his one and only warning as, with a burst of power, Tiernan shoved himself in.

An entire foot of meat pierced the insides of that vagina, making Sylvia's hands drop down on the floor as she almost instantly collapsed. She broke out into a lewd, drawn out moan as her eyes went cross. "Suh-sooooo good...!"

"Y-you alright...?" Tiernan shivered, stopping himself after that unusually easy insertion. The sheer amount of pre his dick had bathed itself in had done its part as natural lubricant, he supposed. He could feel the warmth and tightness of the vixen's fleshy walls. Before he got an answer to his question, however, he felt pressure at his back. Tiernan only got a glimpse of Sylvia's fluffy tail before it forced him forwards, impaling another foot of dick up her pussy. "Oh fuck!"

"Oh God! Tiernaaaaaan...!" Sylvia cried out loud, squirting so powerfully that Tiernan thought he was going to be blown back by the excessive secretion of sweet nectar. But that tail held him in place, and tried to keep shoving him further inside.

"Cuh-can't believe this..." Tiernan told himself. With how big his dick had grown, he was convinced he could've knocked somebody out cold by swinging it like a bludgeon. Yet Sylvia was taking it in like a champ, and her pussy was hungrily sucking for more.

The last six inches were gradual, prodding for limits, testing them and quickly surpassing them. With every milestone drawing him closer and closer, Tiernan got a good up-close view of Sylvia's anatomy. He had nowhere else to look at.

It was a smooth, fluffy prairie of dark and light grey fur wherever he looked. One glance up and all he could see was his lover's humongous breasts wobbling above him, hiding her face from sight; and yet he had no need to see it to know it was twisted with pleasure.

He could see her clitoris, big, red, hard, swollen. An unmistakable sight, and an inviting one at that. Feeling almost magnetized by Sylvia's pleasure button, Tiernan leaned in as he continued his incredible penetrating operation. He made her squirm with a swift peck to it, but was soon eagerly tonguing it. He could hear the ground being slapped by her tail. Her thighs vibrated almost gelatinously around him. More juice poured out. She was in bliss.

And soon enough, his almost basketball sized nuts touched her gluts. Male hips met oversized female sex in one disparate kiss which forced Tiernan's face off her clit. Instead, he started dragging his face up along her mons, giving it tender and affectionate nuzzles. He held his hands down on her hands, sliding them up until his arms were encircling as much of Sylvia's waist as he could. With enough support, Tiernan's and her moves became automatic.

Rocking hips were an initial, clumsy exchange that took a while to harmonize. It was almost literally a 5 times size difference after all! Sylvia wanted to be careful with her own humping, not wanting to crush her little lover now that his wonderfully supersized dick was inside of her needy womanhood. But she found that Tiernan seemed to have become a man possessed thanks to his new endowment. His hips were soon moving in flurries of frenetic humping.

It wasn't a loving, tender exchange highlighting a blooming new love. Tiernan and Sylvia were fucking like animals. The only reason he wasn't loading her legs over his shoulders to slam himself in and out like a jackhammer was the obvious one. Tiernan's arms couldn't even wrap around Sylvia's waist, much less hope to move her. But he was compensating by ravaging her tender insides, stretching her walls and pounding them to tomorrow.

They each screamed the other's name in passionate desperation. Sylvia's pussy was squeezing him down, milking out fox pre like her life depended on it as sustenance. Tiernan was rapidly achieving satisfaction again, this time together with his lovely assistant.

And ten minutes of brutal fucking later, Tiernan could again hold himself back no longer. With a final thrust, his wrecking balls heavily smacked Sylvia's ass into making her squeak. As he muffled his own roar of pleasure into her pelvic region, Tiernan ejaculated with the force of a firehose, depositing a veritable flood of fresh hot semen that could've choked the average lady. He came over the span of 10 uninterrupted seconds, supplying Sylvia's womb with all of his precious seed.

Sylvia came with him, announcing herself with another, lewd, feminine wail that seemed to shake the court. The expulsion of sexual juices hardly managed to push back Tiernan's monster load, and instead of explosively squirting out it streamed down between their joined loins. The combined excess of their sexual fluids gathered under Sylvia's ass and Tiernan's feet, ensuring their deed wouldn't be hard to spot.

Finally, the giant vixen collapsed on her back, stretching with a great moan of delight. She reached down to pull the exhausted Tiernan out of her pussy as if she had been extracting her favorite dildo. She brought the highly productive fox closer to hug him against her voluminous chest, his tremendous junk slowly shrinking back to barely over 22 inches in length; its new soft size. His balls appeared considerably less swollen after evacuating so much seed; he had become pent up without realizing it.

As Sylvia stroked Tiernan's shaggy hair, she gave him a smile. "That was amazing, Tierny."

"You were amazing. Fuck, that was like a dream..." Tiernan was talking with his eyes closed, as if he was afraid of opening them.

"But it wasn't. I felt it all," Sylvia cradled him against her mighty bust. They had both stopped growing, but they hadn't shrunk back at all; Tiernan's afterglow notwithstanding. They weren't waking up because they weren't asleep. "And I'm sure you felt it too, mister. I don't think anybody's ever screamed that loud against my hips."

Blushing, Tiernan dared one eye open just to direct a slightly offended glare up at his lover. "You try ejaculating a bathtub's worth over ten seconds after having gone your whole life putting out... a just over a bottle cap's."

"Point taken!" giggled the giantess. She relaxed, giving her small but gifted man a good back rub while they lazed over the gym court.

Their relaxation came to an end just as their ears stood up to the sound of the hallways nearby filling up with students coming out of their classes. Tiernan and Sylvia exchanged glances as they realized they were still massive in their own respective ways, but one question remained lingering in the room.

Sylvia nervously laughed as she dared to ask: "Does this stuff wear off...?"

The End.