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The full-body exam was simply a bonus. Indira had been looking forward to it. Visiting her most trusted, if unlicensed doctor came with a certain number of extra benefits. Being handled by the masked rat, all clad in leather, crackling with every movement, gloves flexing as she firmly inspected every inch of those naked stripes and curves was a pleasure well worth the appointment. Victoria was an expert with her hands.

The rat doctor in the beak-shaped mask took her time examining the tigress. Some of it was like a massage, some of it was more methodical and medical. She squeezed deeply into each muscle to ensure there were no hidden injuries she had missed throughout her tests. For others, it might even have been mildly painful at times, but Indi enjoyed each touch. From her neck and shoulders, down each arm to individually grasp each finger, tugging and kneading them from joint to joint. The tigress was very patient through the process, though she made no effort to conceal the looks she was stealing at the doctor, and the way that full-body outfit hugged around her curves as she worked.

Something about the clinical fashion Victoria utilized to fondle Indi’s breasts made it all the more pleasurable for the tigress. The rat was extremely thorough. She made sure to tend to every angle, every possible place to press her fingers in deep, or to squeeze and heft them up and down, sometimes squishing them together. Indi didn’t question it, even when it seemed as if the doctor were merely amusing herself. She knew the masked one’s methods were unconventional, but she was a professional before all else.

That same devotion to being thorough continued as Victoria made her way down the tigress’s sides and belly, pushing against that taut middle with the tips of her fingers. It was tight and lean for the time being, but the tigress was going to get a whole lot bigger in the coming months if her plans came to fruition. She leaned back and raised her legs when silently instructed, allowing the doctor to run her hands along the curves of her hips and to feel those bare, striped cheeks. Down she went, until she clasped each of the tigress’s paws in turn, pressing into the pads firmly enough to seemingly stimulate Indi internally, tending to those nerves in a most precise fashion to leave her feeling loosened and relaxed.

When she was done, Victoria rose to her full height - notably taller than the tigress herself - and nodded a few times. Then she strode to a display, where she scanned through the results of various tests, softly speaking to herself.

“Normal ... healthy ... [i]exceptional[/i] ...” She clicked her tongue behind her mask and turned her attention to her patient. “A most curious example of a woman your age, Indira.”

“So I am told.”

“Your physical fitness explains your overall excellent health, of course. What is less easily explained is your [i]fertility[/i].”

That did not move the tigress. She simply gave a short nod. “Mmhm. I have felt it.”

“That is no surprise. You are not simply experiencing your heat cycle as usual. If these results are not in error - perish the thought - then you must be enduring significant discomfort and greatly heightened sexual interest. Does that sound correct?”

Making no other sign of how she felt, Indi nodded once, “Yes.”

“Hmm. You are a very patient woman, in that case. How does that make you feel, if I may ask?”

The tigress responded calmly. “That I have never seen you outside of that outfit. It fits you very well. Though I think I would enjoy seeing what’s beneath.”

“Ah!” Victoria’s eyes gave a shimmer behind the mask. “I should like to enjoy your particular sensitivities. You are, legally, my volunteer and not my patient, in truth. There is nothing wrong with [i]experimenting.[/i]”

“If you’ll please, doctor.” The tigress nodded again.

Though the process of undressing herself was as methodical as everything else she did, there was still something erotic about the rat doctor so efficiently stripping from that long black cloak like that. She let her hood down and began to remove layer after layer. Surely it must have been warm in all that leather, and yet Victoria showed no sign of perspiration. Beneath all that mystery, she had pristine white fur and casually revealed the drop of a soft, yet sizable slab of glossy black rat cock for the tigress to fix her longing gaze upon. Everything was to be carefully placed on its respective hooks before proceeding of course. When she was down to just a pair of boots and her face-concealing beak, Indi raised a hand to stop her.

“Leave the mask, please. No offense intended. It turns me on.”

“You are not alone in this among my guests. Now then.” The slightly sway of Victoria’s bare, thick tail went along with her broad hips and overall tall, curvaceous figure. “How may I best serve your cravings?”

The tigress took a mere few seconds to scan up and down the rat’s whole body. From that stark white fur in contrast to the glossy black of her shaft. The heft of her perked bust and the low swing of her heavy balls, the slight paunch to her belly. It all left the cat flushed in the cheeks and her pussy so wet it was audible, lightly [i]schlicking[/i] with the steady pulse of her needy clenches. Yet her first thought was how she could best apply her tongue to that newly revealed body.

“I think you should sit on my face and let me tend to you until you cum all over my breasts.” Indi had a way of delivering such observations without a single break in her expression. “I would say it is my way of giving thanks for your thorough treatment, but in truth it is mostly about what I need.”

Victoria meanwhile couldn’t help a smile. “A careful bit of play, and we may well avoid impregnation. Though you will need to mind my productivity under such stimulation ...”

“That is hardly the plan, doctor. I want your seed in me before we’re done.”

“Hm.” Victoria considered just a moment, and then nodded. “Indeed. That can be arranged. Do keep in mind the additional effects of unprotected contact with my prime vector.”

The tigress gave a knowing smile. “That is a cute name for it. I have considered that well. I want what lives inside you. Let me spread it to the others, and see how it changes them.”

Even behind the mask, there was a flash of something in the doctor’s eyes. She liked that thought. The tigress remained sitting as the masked rat made her approach. Only when Victoria was up on the examining table with her, kneeling over the blue feline, did she stretch out and offer herself as a seat. By her grabbing and tugging, she was not inclined towards patience at the moment. With her sex slick enough to visibly drip down the inside of her thighs and over the base of her tail, the tigress welcome the rat upon her muzzle, making a cozy chair of herself, getting nestled in under that raised pink tail so she could lay her lips on a smooth black hole at last.

For all the stimulation of that rough feline tongue, Victoria wasn’t dissuaded from grinding and riding that pretty face in a much less professional manner than she’d displayed through the examination process. As soon as Indi started licking, the rat pressed down firmly, plump black balls resting on the tiger’s chin. She nestled down and smothered deep, but Indi wasn’t going to stop even if it meant she could hardly breathe. With her hands wrapped around Victoria’s hips, she pulled that fine ass back on her face, wedging her muzzle deep between the cheeks, and applied her slightly scratchy slurps from taint to tailbase with all the strength she could muster.

Such fine work had an immediate effect on the doctor. Her shaft went from plump yet soft to chubbing up and filling out plenty more with every lick. It was leaking before she was even fully rigid. That thick, plaguebearing precum splashed down over the tiger’s bust, soaking into her fur or streaming down into her cleavage. One single drop was enough to inflict anyone with a highly contagious strain of her special, self-made something that drove even the most chaste into a lust-crazed frenzy. Indira wasn’t going to be able to control herself if she became a carrier - and neither was anyone else who got a taste of her.

If Victoria moved even slightly too far away while she got her ass deeply eaten by an immodestly drooling, horny tigress, she found herself gripped even more tightly and tugged back into place by the deceptive strength of the older cat. There was no choice but to grind, and even she couldn’t help give a few soft moans, even a squeak when that stimulation just kept going, even as far as penetrating inside her with those deep-stroking licks. She rode that face and let Indi’s talents do all the work. For as much as she was throbbing, she didn’t even bother to play with her cock, choosing instead to rub at her breasts while she spurted a whole pool of precum onto the cat’s trim middle.

Bucking back with a sudden huff of pleasure escaping her masked mouth, Victoria found herself hardly the queen on her throne when a certain tremble started passing through her whole body. She curled her toes, squeezing her thighs inwards for a tighter clamp around the tiger’s head. That didn’t distract Indi from her goal. She pushed her tongue fully inside the rat and brought an orgasmic cry from her doctor. With one hand around her own breast, and the other planted on the small of her back for support, Victoria erupted in a sudden torrent of thick, tainted plague rat cum to hose and paint down the naked body of the eager patient she was so snugly sitting on. All it took was that tongue to milk her of one of her typically excessive cumshots.

A great, splashing [i]SPLAT[/i] of spunk left Indira slathered and drenched from the very first shot. She kept her tongue where it was, curled, pressed precisely to the rat’s prostate to ensure she bathed in every drop of cum she could get. Rivers rolled down the inside of her thighs and dangerously close to her overheated sex. One drop would have done it in a state like that. Yet she was never going to be satisfied with an accidental impregnation. As soon as that rat was done cumming, the tigress pulled her tongue back, no matter how shocking the sudden movement was. Victoria had a mere few seconds to act before she got pounced by a shockingly needy tigress, but she knew the stakes and moved with the haste the situation demanded. Those test results didn’t lie.

A swift swish of her tail and a turn of her hips had her face-to-mask with the blue cat. She leaned herself down, cock still dripping post-orgasm and yet pumping up again to ready for another, and planted her hands on Indi’s shoulders. It wasn’t a matter of overpowering the big cat, but rather giving her a reason to remain subdued and receptive. Pressing her beak down against one whiskered cheek and rubbing back and forth, up and down from ear to the curve of her neck, she added that scritching stimulation to the process of mounting Indi and pushing her into a proper mating press. For as intelligent as the slightly mad genius may have been, she knew the appeal of a little brute force.

Snatching those strong thighs and pushing on them until the tiger’s lovely features were framed by her own paws, Victoria remained where she was, eyes glowing through her mask, staring into the violet gaze below her. Indira gave the occasional snarl, but mostly she rumbled for the doctor. All that testing, all that poking, prodding, and squeezing, and she was finally going to get the relief she needed. For Victoria, it was more than just scientific curiosity. Pressing close to the tigress meant getting plenty of her own cum all over her fur, but it was worth it just to smoothly gloss up her cock in all the juices flowing from that tender, heated tiger pussy.

One stroke was enough to get her entire shaft soaked in all those fragrant juices. Her mask protected her from the effects of all those pheromones, but she was not immune to the sensation of sheer wetness glistening and dripping from her cock. It was enough to make her pump out a generous glob of precum to splash onto the spot just above Indi’s sex, smearing into that fur. The amount she was leaking was more than enough for breeding purposes, given the tiger’s receptive state. Yet she could not rest until she lined that thick black rat cock up with those trembling pussy lips, pushed forth, and spread that blue cat out around all that veiny, solid length.

The professional in her thought it almost irresponsible. Not the having sex with a patient part. She had explained it was more of a volunteer position, a subject in her most recent trials. More concerning was going balls-deep inside a pussy she knew to be almost impossibly fertile. It wasn’t a question of getting the big cat pregnant, but [i]how many[/i] times she might with just one cumshot right into her waiting womb. Yet for once, she allowed herself to think a little less. Her body demanded she bottom out between the stripes of those lifted thighs and thump that fine cat’s ass with her heavy balls. The first plapping smack sent such a satisfying ripple through both their bodies and brought forth such a pleasing purr-like rumble from the tigress that Victoria would have had to be an idiot to even consider stopping.

Even from below, folded in half, Indi had a way of guiding her partner with the subtle motions of her hips. Victoria knew exactly where she wanted it, and how hard to give it too. She followed her horny guide and fucked the tigress deep. Every swing and smack of nuts to ass produced an impressive sound, echoing through the examination room, blending with Indi’s snarls and Victoria’s mask-muffled moans. At times, Indi came dangerously close to slipping out from beneath the rat and taking over, but the plague doctor kept a firm hold on her patient’s ankles, making sure to squeeze just right to make it so much harder to gain any leverage. The rest of the fight she could just fuck right out of that horny beast.

Though her rumbles persisted, there came some shriller, more aggressive sounds from the tigress too. Her teeth were on full display at all times by then, but it didn’t dissuade the rat from rutting the cat full to overflowing with precum alone. She knew the only thing that could quell that fire was a big fat load of cum right inside her. It was her duty to do everything she could to soothe her patient, even if she wasn’t calling her that. Every stroke brought a heavy [i]schlick[/i] from that pussy, followed by an equally lewd and excessive [i]schlop[/i] on the back stroke. Wetly plapping all throughout, Vicky’s nuts grew taut in time, flexing with the need for release. It was time to make that striped milf a mother again.

A little push at those shoulders to keep the tigress flat and assert herself a little, and Victoria was free to rut a finish between those thighs. Though her body didn’t have an obviously athletic appearance, she had all the stamina she needed. Pumping, fucking, slamming even, she got just the right kind of rough with that tigress to leave Indira’s estrus all the more overpowering. She saw the light in those violet eyes change. From fury, it turned to desperation. Her clenching cunt was impossible to resist for any longer. She wasn’t going to have to wait more than a moment before the plague rat bottomed out, nestled her nuts snug against those aching pussy lips, and shot her plaguebearing load straight into the womb of the over-fertile tigress to knock her up in an instant.

Indi joined her in orgasm the moment that cum entered her. She wasn’t just getting pregnant with the rat draining her shiny balls inside her. She could feel that tingle spreading, that delicious feeling of getting [i]infected[/i] with something marvellous. Victoria’s creation spread from her and into her volunteer, leaving that tigress shaking with extended climax, squirting for the good doctor, clutching, clinging to that masked head as if to pull her into a kiss. For a moment, even the tigress was inelegantly flailing, violently twitching too, locked into a peak that she simply couldn’t come down from. She was mewling by the time the rat stopped plapping her. That time, it really was a purr.

Snug atop the folded tigress, balls nestled against her sex, Victoria humped and rubbed until she was certain she had completely filled Indira up, until she’d made such a mess of that womb there simply was no doubt her seed was taking, right that very moment. She would have loved to keep the tigress overnight and study the responses her body had to such a satisfying feeling, especially all plagued up, but she knew Indi had plans. Instead, she slowly [i]schlicked[/i] her cock out of that flooded sex, leaving that black dick dripping long strands of tigress juices and rat cum all mixed together. The sight of it shining there beneath the lights, raining down that mingled mess left the tigress licking her lips.

She all but pounced the doctor, but instead of knocking her down, she just shoved her face between Victoria’s thighs. It was an impressive feat to move from that position on her back, legs up in the air, to suddenly lunging forth and sprawling out on all fours. Victoria leaned back, thighs spread, and let the tigress latch on. Indi’s lips slipped down that sex-slick cock to the very base all in a single motion. She bottomed out with a solid [i]glurk[/i] when she swallowed several inches. Not one flinch, not one gag interrupted her focus. She mashed her nose into the wet fur of the rat’s groin, sniffed deeply, and started to suck like a fiend for those juices, for what remained of that thick plague-load clinging to that still-stiff cock. It wasn’t an unusual response for those who Victoria made into another carrier, but a particularly enthusiastic one for certain.

“Ah!” came the rat’s cry, pleasured as she was curious. “That is not the heat guiding you now. That must be the plague. Eager for another dose, are we?”

This time, it was Victoria’s turn to moan. She leaned back so she could plan her hands firmly, grasping the edge of the table for support, ass planted down firmly under the tiger’s care. Indi dove up and down, cleaning the mess up with her tongue and gulping it all down, but mostly just sucking with such fervour that even the rat could hardly handle it. The masked one steeled herself and took a few deep breaths through her beak before finally reaching up to remove it so she could gasp a little better. Her eyes glowed over the scene as she puffed in delight, watching that white-streaked hair sway with those lunging motions, feeling that muzzle thump against her crotch and balls alike. It didn’t take her long to bury a hand in those soft locks and start pressing the tiger’s head up and down, working her hips to fuck that lovely face and get those features a little sloppier.

A very gradual roll, slinging a thigh around Indi’s head allowed the rat to eventually overtake the cat and flip the situation around on her. Once again, Victoria found herself riding that muzzle, this time from another angle. Bearing down on the tigress from above, she got her dick pointed straight down Indi’s throat and fucked it with all the force she liked. The tiger wasn’t going to choke on it, no matter how much it bulged that soft white neck fur. She closed her eyes and kept on sucking right through the pounding, the balls-deep throatfuck from the plague doc herself. Victoria surprised even herself at just how carried away she got.

With one hand behind the tiger’s head, she gave her deepest thrusts and made Indira swallow that cock again and again. She might have fucked that face even harder than she bred that pussy. Each stroke smacked her balls against that chin a little harder, left her grunting and puffing with the urge to spread what lived inside of her all the more. One dose was sure to make Indi’s upcoming orgy interesting. Two was going to transform it into a frenzy. She was going to make that gorgeous, elegant feline into her knocked up plagueslut, and she loved the thought so much she couldn’t slow her rut for anything. Indi offered no complaint. She never seemed to tire of sucking on that cock.

“Ah ah ... such a good patient you have been ... [i]mmm,[/i] you shall make such an irresistible carrier. Brimming with my creation as you swell with my seed ...”

After that declaration, Victoria gave nothing but the grunts and moans of pleasure that came with bottoming out in such a warm, wet mouth, grinding on such a stimulating tongue, getting squeezed by such a tight throat. Indi was gulping before she even got that load, coaxing out even more of that potent, plagued cum she craved. The moment Victoria went rigid, arched her spine, and shoved forth to make that cat take it all came with a pleased cry from her newly revealed lips. Blasting straight down that gullet, met by those immensely eager swallows, Victoria got her cock milked so thoroughly that she managed to empty out her balls entirely, to spurt so much straight down into a slowly growing tigress belly that even she ended up twitching and dry-firing by the end, doubling over in wince-inducing overstimulation.

Such a diminished state was only going to last for a few minutes. Her self-experimentation enabled tremendous stamina when needed. There was the temptation to just remain where she was, mounted over that muzzle, and start humping until she recharged for another round. Instead, she slowly wrenched herself back from the tight grip of that overflowing mouth and popped from those lips with one more watering spurt.

She was panting like a dog, sloppy and wet, but that was nothing compared to the undignified, cum-splattered mess she’d made of that fine tigress. Indira was soaked from tits to ears, washed down in a mask of hot cum that she did nothing to clean off of herself, but for a few licks of whatever her tongue could reach. The rest, she simply wore, letting it soak into her fur and mark her. She had become a contagion, smelling richly of her rat doctor, claimed and bred, yet the heat remained. If she had her way, she was going to get knocked up many more times that night. But first she owed the woman of science a kiss.

They both had the same thought. No matter how sloppy it was, rubbing perspiring bodies together, steaming in the warmth they created, they were happy to seal their experimental breeding session with a long, deep exchange of tongues. Tasting each other, basking in their moment and their mutual fondness.. Indira couldn’t linger all night, as much as she might have liked the thought of being bound and confined in the plague doctor’s clutches. She had an orgy to attend, and Victoria had plenty more experiments to run once she was freshened up a little. Such a successful session was surely going to be the start of something even better for the two of them, but neither was in a rush to find out just what that might be.