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Arc's tail fidgeted nervously as he waited in his seat. The whole office setting was finally starting to unnerve him. He thought he'd be prepared for this, go forth with confidence and be ready for what could be the ultimate life-changing experience. The longer he sat there, though, the more uncertain he was about his choice to come here.

Sure, they had offered him a large sum of cash for taking part. He'd already received two grand for just showing up and signing the paperwork. Didn't have to read it or anything, just sign on in and sign on up. Perhaps he should have read it a little more carefully. Then again, desperate times called for doing things you might not otherwise want to do for some quick cash. And he'd been promised that he could walk out of this office--today--with more than enough to last his entire lifetime.

The clock on the wall ticked by, though, at a slow yet steady pace. At this rate, he'd pass up his lifetime before they came to collect him and he could collect his money. Thumping out the seconds, Arc had seen a full hour pass at least assuming that he hadn't dozed off or zoned out and missed an hour or two on the hour hand-less clock. Without any magazines to pass the time, though, it's not like he had any other real options while waiting. Just count the seconds and think of each one as an extra hundred dollars.

At last, a tall, dark-grey wolf in a lab coat entered the waiting room. "Let's see," he droned, taking note of some clipboard notes, "feline, male, age 23. Arc?"

Arc was pulled from a doze by the sudden break in the silence. "Um..." he replied timidly, "that's me."

"Good. Now, then, if you'll follow me, we'll get you settled in in your quarters for the duration of your stay."

Hesitantly, Arc followed after the doctor. This place was weirding him out more by the minute, especially was they weaved through the giant maze of hallways and rooms. And he didn't remember being assigned a "specialist". If the pay was good, though, dealing with the doctors would be worth it. At last, the wolf led Arc into a small office, reminiscent of the kind he'd seen at just about any normal doctor's office. "Please have a seat on the lab table. Doctor Clane with be with you shortly," the wolf noted monotonously before leaving the room. Following the instructions, Arc climbed onto the lab table and took a seat to begin the long wait in yet another empty room. Arc distinctly heard the door click as it was pulled shut. Whether that was the normal sound it made or the sound of a deadbolt locking him in, though, was impossible to discern. He just had to hold out and do what the doctors told him--the payout would be worth it.

Following another indefinite period of silence and waiting, he heard someone fumbling with the door (so it really had been locked, after all). Several seconds later, a younger canine girl--perhaps a few years older than Arc at most--with a luscious coat of blonde and brown fur entered the room. He couldn't help but stare a little at the petite woman. "Good afternoon, Arc," she stated confidently. "I'm Doctor Clane and I will be your attending physician today." As she began or spiel, she began rummaging through the cabinets and preparing various tools and supplies. "Now, before we begin, we'll need to perform a basic physical examination."

Arc's throat caught--he hadn't been expecting anything like that. Not that he was in bad health, it was just that, well, with such a beautiful woman there, he was now beginning to feel the tell-tale signs of an impending (and throbbing, too, at the rate it was advancing) erection. Without giving it too much thought, though, he began to strip when commanded to by Doctor Clane.

In rather short order, Arc was standing in nothing but his undergarments, which clearly outlined his sheath and growing erection, the tip beginning to poke out and wetting his underwear with pre-cum. Doctor Clane giggled at Arc's embarrassed arousal. "Don't worry--arousal is a sign of good physical health," she joked before quickly kneeling down, gripping the underwear, and tugging them down to the point that they were around his ankles. He quickly acted to cover his exposed bits, but was stopped by the source of his piqued interests as she grabbed him by the wrists and pulled his paw away from his turgid member. "Now, now, Arc. No need for you to be embarrassed. This is just going to be a brief check-up," she reassured him, giving him a light push to get him seated back onto the lab table. "Besides, I don't mind seeing a piece of meat like yours while I work," she teased with a wink.

Immediately, she resumed a professional demeanor and went about the physical. Measurements of heart rate, blood pressure, breath capacity... nothing at all out of the usual. Afterward, she grabbed a syringe off the counter. "Just a relaxant, dear. Nothing for you to worry about." Reluctantly, Arc accepted the injection. After a couple minutes, once he felt the concoction kick in, she turned her attention a little lower. Arc began to protest when she began rubbing his inner thigh, restoring whatever hardness he had lost during the normal half of the physical, but she quickly cut him off, though, gently guiding him onto his back. "Just relax, hon. It'll be worth it." Arc suddenly felt at ease about the whole thing, completely reassured that this was going to be enjoyable. He could feel her paws slowly running all over him and he could do nothing but let out a pleasured sigh, her fingers gently caressing him--starting with his balls, then moving slowly upward toward the tip of his cock--with the occasional grope or pleasurable squeeze along the way. He could feel his pleasure building throughout her ministrations, her grasps and strokes bringing him closer and closer to his peak.

Suddenly, though, her gentle touch pulled away and she resumed a more professional manner. "You certainly pass our requirements for participation," she commented while writing down a few notes on her clipboard. "Don't worry, though," she responded in a more chipper matter, "we'll continue with the fun shortly. First things first though..." she trailed off, turning back toward the counters, opening up a high-tech, sealed container Arc had, until this point, not noticed. She brought the opened container to the side of the table, prompting Arc to prop himself up in order to get a better view of the contents. Arc noted a number of vials, each containing a brightly colored solution and labelled with a dollar amount.

"Each vial contains a different experimental substance and, before you ask, no, we're not allowed to tell you which is which--don't want to contaminate results with false positives. The only thing you have to do is tell me how much you'd like to walk out of here with today and we'll select your experimental dosage accordingly.

Still lust addled and under the soothing influence of the drugs already in his system, Arc's mind jumped back to why he was here: he needed the money and, as long it was being offered, he'd take all he could get. With that in mind, he immediately reached for the vial with the highest dollar sign. No risk, no gain. And it's not like whatever was inside the tiny vial would change his like too drastically. After all, he was too relaxed to really care and that should be good enough of a reason to not worry about the outcome. He'd be set for life with this--and that made it all worthwhile.

He looked at the contents of the small tube. The liquid inside was very watery and a pale shade of translucent lavender. He found looking at it so fascinating. What could possibly be inside that would be worth so much? "Mmm..." Doctor Clane spoke up, breaking Arc's entranced contemplation of the vial, "one of my favorites. Now, before we administer this, would you like to double the value by also taking the companion serum?" Without even giving it a second thought, Arc nodded his head and mumbled his consent. Chuckling to herself, Doctor Clane opened another case and pulled out a small vial of bright blue liquid and, taking the vial along with the lavender one, opened both and poured them together, causing the solution to take on a distinctly dark, cloudy violet coloration.

Before Arc even realized it, Doctor Clane had prepped the injection. "Last chance to back out," she warned him. After a moment of hesitation, he responded, "I'm ready." Doctor Clane gave a wide, knowing smile and, applying a light pressure to his shoulders, held him in place while she lined up the needle. Arc watched the needle slide into his bicep with just a small pinch, then, as Doctor Clane pushed down the plunger, he felt the violet concoction enter his blood stream.

Arc felt... tingly. That was, by far, the best way to describe how he felt as the substance coursed through his body. As it spread through his system, the numb tingling sensation followed. He wasn't worried, though--the calming medication combined with a growing lustiness--made sure of that. Arc looked over his body and quickly noticed that he was positively rock hard. Reaching down, Arc grasped his rod with both paws and slowly continued his earlier stimulation. It felt so much more intense now, though. He began building pressure and speed as his paws glided from the base to the tip and back again. As he grunted and moaned in absolute bliss, rolling onto his back on the table, Doctor Clane cheered "Keep it up, hon, I'll be ready on this end in a moment" while she prepared her own injection, a hazy turquoise mixture. Once she had injected herself and began to feel its effects, she, too, took off her clothing and, approaching Arc, joined in the pleasuring.

Doctor Clane climbed above Arc on the lab table, continuing to tease herself along the way. Once seated on Arc's stomach, she pulled her now-lubricated fingers away from her snatch and started masturbating the cat below her. Given her expert and far more stimulating strokes, Arc let her continue working on his rod in favor of returning the favor by prodding around for her opening. Seeing he was having trouble finding her slit, Doctor Clane leaned forward, fully exposing herself to him while never ceasing to stroke the wanting member before her. Arc gratefully dipped his fingers into her dripping pussy, doing his best to stimulate the kind doctor just as she was doing for him.

As she kept working her paws along his shaft, Arc felt himself building once again toward a climax, only the mounting pleasure was no longer centered in just his cock, but was spread throughout his body alongside the tingling warmth running through him. While she continued treating his shaft in a mixture of her juices and ample amounts of Arc's pre-cum, his shoulders felt constricted as they pulled inward and rounded. He felt one of Doctor Clane's paws running up and down his waist suddenly begin to follow curves he didn't have before. Suddenly, an intense amount of the tingling pleasure centered in his chest, prompting Arc to pull his paws away from Doctor Clane's vagina and focus instead on groping his chest. Before long, Arc was moaning in absolute delight and ecstasy while fondling the expanding mounds that would become his new, moderately-size breasts. Doctor Clane turned herself around and slid down so that she was seated on Arc's lap, resuming her strokes up and down Arc's shaft while reaching over to the counter for a sample bottle, which she set beside her on the lab table.

“Let it go, hon,” she grunted as she milked his shaft for all it was worth. Arc proceeded to moan, his voice climbing higher with each “Oh” and “Ah” that slipped out. She could feel his peak approaching rapidly. “Mmm…” she cooed, “now comes the best part.” Arc writhed below her, moaning and groaning, groping himself with abandon. He just wanted release! Doctor Clane picked up the pace, her paws working his slickened shaft feverishly. Arc did all he could to rock his shaft into the tight grip of Doctor Clane’s paws, to push himself over the edge. “Let it out, hon--the last of your male cum. It’ll be intense, but, trust me, you’ll love it.” Arcs eyes flew wide open just as he crossed the point of no return. ‘Last male cum?’ Didn’t matter though—and, with a moan of absolute bliss, Arc felt his orgasm overtake him as the first shot of his hot load spurt out. Doctor Clane quickly grabbed the sample bottle she’d set aside with one paw, getting it to the tip of Arc’s cock just as the first shot burst out while continuing to stroke his shaft with her other paw. Arc’s orgasm was longer and more intense than anything he’d ever experienced before, each throb pulling more and more cum from him and bringing him to a new peak, causing him to cry out in absolute ecstasy. Doctor Clane’s strokes became shorter with each thrum of additional cum as Arc’s malehood shrunk between her fingers. She then set aside the bottle--now completely full of his sample--and began fondling his balls, eliciting additional girlish squeals from the changing male as he continued to spurt with renewed vigor. His balls felt extra tight against him as she cupped, squeezed, and pushed on them. He had no idea he could orgasm this long or this much! Whatever was happening, he didn’t want it to stop!

Doctor Clane smirked, looking at the tiny remnants of his balls and malehood in her hands as she saw the tip of his cock finally spurt its last drops onto his fur before sealing up entirely and his balls fully receded into his body, causing the changing cat to let out a sigh as he began to come down from his orgasmic high. Arc felt the tips of her fingers caressing where his balls had once been before they slowly started pushing inward, shaping the beginning of his new vaginal canal. Arc felt Doctor Clane push her fingers deeper with each pass, causing newly-formed muscles Arc didn’t know she had to clench around the doctor’s fingers, causing her arousal to once again begin building--even after all she had just released! She felt so horny again already! “Oh! Keep going!” she cried out to the doctor. Doctor Clane kept going, causing Arc to feel every ridge of the doctor’s knuckles as she went deeper with each thrust of her fingers into her new pussy and she felt further changes beginning even deeper inside her abdomen.

Abruptly, Doctor Clane withdrew her fingers, leaving Arc with a feeling of needy emptiness. She immediately filled the emptiness with her own fingers, vigorously jilling herself in a fumbling and inexperienced manner as she began to explore her new anatomy with one paw while continuing to twerk, twist, and tease her breasts with the other. “Take a little time to get to know yourself, hon,” Doctor Clane chucklingly commanded her while sealing up the semen sample. Arc did, groaning in lusty delight at the new changes and experiencing such exotic and extensively more sensual sensations to her sex. As she fumbled along her lips and inside herself, even up to flicking her clit, Arc realized that her own ministrations just weren’t enough so satisfy the neediness she now felt.

Doctor Clane climbed back onto the lab table in a seductive manner and, shoving Arc onto her back, sat on Arc’s chest, leaving Arc now fumbling blindly at her folds, whimpering in her growing need. Doctor Clane chortled, slowly teasing herself inches from Arc’s face so that Arc could see all the intimate details of her self-pleasure while Arc continued to whine in burning need. “That’s just the heat, honey. You’re the one who wanted it added to the serum.” Not that Arc could really pay attention to the reason why. She needed more than what she could give to herself. Leaning in close, Doctor Clane whispered in Arc’s ear, “You give me a little help, honey, and I’ll make sure you get stuffed nice and full.” Arc couldn’t help but immediately nod her head in agreement. Whatever it took, she’d do it! “That’s what I thought,” Doctor Clane replied with a dominant chuckle, flipping herself over and around, lowering herself onto Arc’s face while leaning forward toward Arc’s dripping feminine petals.

As Arc saw Doctor Clane’s pussy approaching her face, she knew what she had to do and immediately plunged in with a savage desperation, even catching the doctor off guard. “Ungh! I see we’re pretty eager, huh, honey?” she sighed, her dominance over the changed cat fading momentarily as she relished the attention to her own need from the injection she had given herself earlier. Arc’s world was enveloped in the moist and tangy savor of Doctor Clane’s snatch. Just feeling the doctor’s warm breath against her folds was stirring her up and, with the first moist lap against her lips, Arc, with a whimper of pleasure, continued with renewed fervor into the doctor’s pussy. She felt the doctor’s tongue slowly prod at every detail of her anatomy, welling Arc up with new sensations that drover her even more stir-crazy.

Arc sensed a slightly spicier, more acrid taste among the doctor’s feminine tang as she. Instinctually, she began focusing her ministrations more directly on Doctor Clane’s clit. She cooed with delight, sending tingling vibrations through Arc’s sensitive canal. As Arc lapped across Doctor Clane’s love button, she could feel the doctor’s pussy constrict and her clit distinctly begin to pulse and swell. Arc tried pushing her tongue deeper into her tunnel, but it felt shallower, resistant to her tongue’s advances, prompting Arc to return her focus to the swelling appendage. Soon, she was no longer simply teasing it, but, instead, sucking on a hardening appendage several inches long. The mere act of pleasuring it and feeling in inside her mouth seemed more appealing than ever to Arc, prompting her to let out a satisfied coo when in conjunction with the doctor’s tongue lapping and nipping at her own clit. Soon, Arc found the clit was even larger and had to begin taking it to the back of her throat it to fit it all in her muzzle. As there was no longer a slit to feel into, she grasped the clit by the base, giving it a squeeze behind the forming knot as she suckled on it. Her thumbs, rubbing the underside of the clit, where Doctor Clane’s lips had previously been, felt two bumps beginning to form that began pushing outwards. As they filled out between Arc’s thumbs, forming plumb, virile testes, the tip of Doctor Clane’s newly-formed cock opened deep in Arc’s throat, filling her with the doctor’s first spurts of watery, salty pre-cum and that spicy aroma which was bringing her to greater heights of burning sexual need.

Arc could no longer stand being so brutally teased by the doctor. Feeling the effeminate cat squirming below him, Doctor Clane pulled his muzzle away from the sopping wet pussy and, flipping back around, addressed Arc with a dominant growl. Looking up, Arc could see, in place of the petite woman who had been there before, a muscled, chiseled specimen. Gone were the soft, pillowy breasts Doctor Clane had had before, now replaced by solid muscle. Every one of his features was far more solid, rigid, and angular. Arc saw it all and, despite never having been attracted to a man in all of her life, she knew she wanted him. Buried in her. Doctor Clane leaned against her, creating fresh tingles through Arc’s breasts, and, in a low, rumbling voice, Doctor Clane began whispering teases into Arc’s ears, resounding through her mind. “Mmm… I can feel your dampness, honey. So needy. But I can fix that. I can fuck you rough, fill you up with pups, and make the burning go away. Do you want that?”

Arc, feeling him grinding his cock against her feminine need, in breathy moans, submitted with a feeble, stuttering reply. Consequences be damned, Arc needed release. “F-fu-fuck me” she let out with a sigh, splaying her legs to grant him easy access.

With a dark, rumbling snicker, Doctor Clane braced himself against the submissive female beneath him. As he rocked his hips back, he replied, “As you wish, honey. I’ll make it worth every penny.” Try as she might to brace herself for what was to come, it was insufficient as Doctor Clane suddenly thrust forward and, the tip of his cock finding hold within her lips, sunk straight into Arc, tearing an “Oh!” of surprise, pain, and satisfaction from Arc’s throat. She could feel every detail! Every inch, vein, and twitch of the shaft inside her, pushing deeper and spreading her! It all felt so foreign and, yet, so fulfilling! At last, his cock has sunk all the way in, so that she could feel his weighty balls slap against her thighs where her own had once been.

For a moment, he simply remained there, buried inside her, filling her with a momentary sense of completeness and fulfillment. Soon after, though, he began slowly pulling out, renewing her heated struggle to be filled and drawing another long moan from her. Just when she felt his tip reach her outer lips, though, he swiftly reversed course and thrust back into her, forcing another guttural “Oh!” from her throat as she felt her tunnel shaping to his cock once again. He soon settled into a rhythm and Arc caught on, impaling herself on his thick rod with greater force and higher speed with each repetition. With each time he bottomed out in her, Arc let out another “Oh!”, each more forceful, louder, and higher pitched than the last.

She needed him deeper inside her. Each pelvis-on-pelvis smack didn’t push him deep enough, leading her to pushing into each thrust with greater and greater force. She could feel Doctor Clane’s knot at her entrance, growing larger with each blow against her. She needed that inside her. To complete her. At last, Arc could feel herself reaching a peak and began thrusting and bucking in a frenzy along with the large male above her, causing the knot to come closer to stretching herself open enough with each thrust. Closer… Closer…. CLOSER…. CLOSER… Arc’s voice reached a squealing shout with each attempt.

Suddenly, it slipped inside her, pulling at her tunnel and triggering her first female orgasm, deluging the cock buried inside her in her juices as she let out an ear-piercing shriek of orgasmic delight! She continued bucking against the knot and Doctor Clane’s erratic pumping, prolonging her elation and bringing her closer to another peak. Doctor Clane rocked spasmatically inside of her, seeking to release his own pent up need. Arc felt her walls beginning to clamp down tightly against the slick shaft inside her once again, prompting a pleased groan from the male and elated anticipation for her. Suddenly, he buried his cock as deep as he could inside her, tipping both over the edge. Arc could feel each hot spurt firing deep into her as her walls began spasming, milking his rod for all it was worth and drawing his seed deeper into her womb. As the two savored the moment, Arc pulled the doctor in for a passionate coital kiss before Arc, with a gentle, satisfied coo, drifted into a light sleep, exhausted after all she had been through that day.

Murring lightly, Arc awoke to the light tugging of Doctor Clane sliding his knot out of her, creating a sudden feeling of emptiness in the midst of her satisfaction even as she was just truly becoming fully aware of what had happened to her not that long ago. After the muscular canine dismounted her, she could feel some of his cum oozing from her, making her fully aware of her femininity and of just how stuffed she had been with the doctor’s seed. “Good news, honey,” the doctor spoke is a soothing tone with a wide smile. “It looks like everything went completely according to plan and you’ll be fully compensated for your participation.” Arc looked down at her body, seeing the cum dripping out of her beginning to pool on the table, contemplating how much she’d changed. Doctor Clane put his lab coat back on and gathered together the clipboard he had with him when he entered the room as a petite woman. As he stepped out of the door, he leaned back into the office. “Before you ask, though, your changes--like mine--are permanent. Hope you wanted children.” Hearing his words, Arc was dumbfounded yet, strangely giddy about the news. With a smile, he added, “be sure to stop by often. I certainly want to meet my kids,” before slipping out of the room and down the maze of corridors.

Arc, dealing with the strange reality she was stuck living in from now on, was on Cloud Nine as she left. True, she was going to miss being a male, but a new world of opportunities was opened up before her. She’d get to learn a new way of life, get a complete makeover to her wardrobe and social life, and, heck, she was going to be a mother. She’d gotten more than just a paycheck that would last her through all of life, she’d gotten the ultimate life-changing experience and she was going to make the most of it.