Disclaimer = All owned by Miss Rowling, the Queen of Potter, and richest author in the universe...blah,blah,blah. She wouldn't write the below. Trust me on this one. Really.

Minerva McGonagall and Hermione Granger same-sex pairing. Sorry if they're OOC: I don't usually write Potterfic, and it's my first time with these two, even if I do read HGMM stories. Mature (but I tried to be tasteful) and NSFW. Inspired in part by tanithw's "In Exile". Transformation fic of sorts; this stuff is definitely an acquired taste, so you have been cautioned/warned/given the opportunity to leave now while you still can.

Unrepentantly un-Beta'd. Carefully spell-checked.


"Call and Response"

A muffled knock on the thick wood of her office door broke Minerva McGonagall's concentration as she was midway through her marking of the last of the sixth year Transfiguration essays. A glance at the tall grandfather clock in the corner told her that it was past curfew and with a frown the witch dropped her quill into the ink well, stood up and walked over to see who could be calling at this hour on a Friday.

"Miss Granger," she said, dark eyebrows knitting together as she gazed at the young woman who had knocked; one of the two students in the school who's duties allowed them to be wander the corridors at this time of night.. "Rather late to be out, isn't it?"

"Professor." The Head Girl's face was faintly pink, and her expression could only be described as one of pain. "I'm sorry for bothering you at this time of night, but I didn't know who else to come to...and...and I..."

The elder witch moved a step closer to the unexpected visitor; all irritation vanished, replaced instead with concern.

"Is everything all right?" she asked, tilting her student's chin with a long finger so that large brown eyes met her own green ones. "You seem upset."

To Minerva's surprise, bright tears began to fall down Hermione's flushed cheeks almost at once. Hurriedly, the young woman knuckled them away with a clenched fist, glancing left and right at the empty hall before gazing up at her teacher.

"Some...something's happened." Even Hermione's voice sounded on the verge of panic. "I don't quite understand why or how...please let me in. I'll...I'll show you."

Bemused, the dark-haired professor let the young woman pass by her into the office and shut the door behind her. It was unlike the Head Girl to be this emotional and frankly, quite worrying. She hoped it wasn't because of a boy – Ronald Weasley and Hermione had broken up rather messily at the beginning of the school year and it only now, almost three months later that the witch was finally returned to normal.

To the Headmistress's shock, as soon as she was inside the room, Hermione tore her school tie from her neck, dropped it and her black robes onto the floor and began to unbutton her blouse with trembling fingers.

"Miss Granger, what are you...?" Minerva began to say, only to have the rest of the words die in her throat as Hermione turned back around to face her and she saw what lay beneath her student's clothing; the reason for the young woman's worry becoming instantly clear.

Where smooth pale skin should have been, soft creamy fur now grew, starting just below the collar of Hermione's shirt and continuing down under the brunette's bra to smoothly descend further below her navel and out of sight under her dark skirt.

The professor's mouth formed a silent 'O'.

"Hermione...how." she felt her voice falter, and tried again. "How extensive is..."

"It started an hour ago." Hermione looked absolutely miserable. "I thought it was just itching before, but then I looked and...it was this. It began...lower down." She indicated her pelvic region with a hand, clearly embarrassed by even having to point. "I really don't know why, or how it started. It's..." the young witch choked back a sob, almost at the point of being unable to speak. "...It's getting worse."

"Shhhh."

The Headmistress moved closer and gathered her student up into long arms to calm her, ignoring the fact that Hermione was dressed only in her bra and an unbuttoned shirt and the boundary between teacher and student was in serious danger of being breached at this proximity, even if it was for a perfectly innocent reason. The brunette clung to Minerva's slender waist like a lifeline, burying her face in the woman's silk robes, still sniffling.

"We will find a way to reverse the spell, do not worry." Minerva assured her, rubbing Hermione's back, mentally running through the possibilities of how this could have happened to the young woman. A poorly cast jinx would have worn off almost immediately; this was a more powerful transfiguration spell of some kind, and beyond the skill level of most of the students in the school. A potion, perhaps, indeed – Hermione had suffered a similar transformation during her early years at Hogwarts. A relapse after all these years? Unlikely, but not impossible. "Madame Pomfrey managed to restore you the last time; I see no reason why it should be any different now."

Her student sighed into her neck, evidently reassured by her teacher's words judging from the slowing by the rise and fall of her chest that had until this time heaved with ill-contained tears.

It was quite nice really, Minerva thought to herself absently; this warm thing in her arms, the pleasure of another feline next to her – she would have recognized the fur from a mile away, even if she hadn't been able to smell the familiar scent of a cat on Hermione's skin at this close distance. Minerva had complete control of her animagus instincts – she had spent a great deal of time on her change and successfully separated that side of her psyche from her human one – but this was a rare occasion where her animagus's nature was...stimulated, for lack of a better term.

Minerva frowned as she explored this realization more deeply.

Arousal?

Deciding that for cautionary purposes it was best to cut this embrace off as soon as possible, she drew back and raised her hands to cup Hermione's chin. She wasn't entirely surprised to see that her student's brown eyes were darker; her pupils had grown larger even with the ample light from the fire. A quick glance down at the brunette's chest under the opened blouse confirmed she wasn't the only one having problems. The office was not cold, so the clearly visible nipples through Hermione's bra could only mean one thing.

"Miss Granger," she said in a throaty voice. "I should take you to the Hospital Wing; Madame Pomfrey will be able to treat you for whatever caused this...change."

Almost unaware that she was doing it, her hand drifted up to caress Hermione's cheek as she spoke this last word. The younger woman turned her head slightly so that she pressed her lips into the center of Minerva's palm with the faintest pressure. Soft bristles were poking from her upper lip, signalling what was undoubtedly the start of whiskers.

It was a catalyst; the tall witch felt her control slipping away at this seemingly innocent kiss. Her body was roaring to life, her humanity fast losing the fight against the normally well-behaved feline side which had gone from kitten-like docility to leonine eagerness in under a minute.

"Hermione...you...need to leave." Minerva's voice sounded distant even to her, a terrible feeling of doom beginning to take hold of her. Nothing good could possibly come of this. Hermione was a student – her student – and even if she was of age, the young woman had never shown an interest in her own gender before now and...and the hand stroking her ribs felt much, much more delightful that it should have.

"Professor..." the seventh year's voice was soft; the same hand trailing slowly downwards to settle on her teacher's hip, gazing up at the Headmistress's face in dazed wonderment. "What's happening? Why do I feel...?"

If what Hermione Granger was feeling was anything like what Minerva was feeling, she couldn't blame her for being confused. Whatever change was happening in the brunette's body was not leaving her hormones alone; Minerva hadn't been this turned on in years, and she had a fairly good idea why.

Her left hand had somehow disappeared into Hermione's mass of thick brown hair, long fingers wrapping up in the heavy strands. Minerva's mind had gone blank as the overwhelming feeling of arousal from this fellow feline dominated her being, igniting a primal passion that she hadn't believed herself capable of.

"I believe a...response of my...animagus..." she managed to whisper before her animagus crushed the last vestiges of mental resistance, her self-control completely sailed out the nearest window and her lips crashed against Hermione's plump ones with a raw moan of desire. Her student was just as, if not more eager, and the pair stumbled across the room to the sofa near the fire and fell into it, still attached at the lips.

Hermione cried out as a slender hand stroked down her lightly furred stomach.

"You like that, Miss Granger?" Minerva whispered huskily into the young woman's pointed ear. She had never felt warmer than she did right then, her skin burning under her robes with an almost unbearable heat.

"Mmmm," the young witch purred out into her shoulder. The changes affecting Hermione's body had not slowed; if anything, her appearance was becoming less human by the minute. Long hairs had begun to grow at her jaw, the beginning of a cheek ruff. Her hands were different too; the older woman hissed in pain when Hermione wrapped her arms around her shoulders and what were most certainly claws broke the skin of Minerva's back through her thin robes

"Gently," she murmured out into Hermione's hair.

The younger woman seemed to have not heard the professor cry out, too preoccupied with lapping at her long neck, eyes half lidded as she settled into a grooming motion. She had whiskers now; the long bristles tickling Minerva's skin as Hermione pushed open the front of her teacher's dark green robes so that she could reach more warm skin with her luscious red mouth. The elder witch arched her head back in pleasure, hands drifting down either side of her student's body until they reached her rounded hips. Her fingers splayed out to cover Hermione's shapely rear end only to stop abruptly as they encountered an unexpected addition to the brunette's rump.

A wordless spell split the seams of one side of the Head Girl's skirt and Minerva slipped it off, dropping the garment carelessly on the floor to join the blouse that she had removed only a minute before.

Impossibly soft, faintly spotted brown fur now covered much of the nineteen-year old's back, but that was not what had drawn the elder witch's attention, rather the three-and-a-half foot-long feline tail Hermione's spine had extended into unnoticed by either of them; the fluffy tip raised and twitching in aroused excitement.

Bright green eyes sparkled.

"My dear, you appear to have a ..."

Whatever else Minerva had been going to say was cut off with a heartfelt moan of pure pleasure. Hermione had managed to undo the fastenings of her robes enough to suckle on her teacher's left breast; a wicked and surprisingly rough tongue circling her sensitive nipple. The slender woman's back arched reflexively as a hot gush of familiar warmth filled the lowest part of her abdomen between her legs, and she clutched hard at Hermione's hips, her own nails digging into her student's skin.

"Please, Professor," the brunette mewled out. Darker fur had begun to trail down the outside of her shapely thighs while creamy soft hair continued down the inside from under the crotch of her panties. Her feet had changed too – the thick dark pads on her soles were too heavy to be simply calluses, the toes larger, the ankles slimmer.

Unable to help herself, Minerva pulled the younger woman up and kissed her soundly, revelling in the feeling of her student's luxuriously soft fur against the skin of her own bared chest as their bodies pressed together. Pale hairs had started to sprout on Hermione's chin, travelling down to form a fluffy puff of white on her chest and neck, spreading smoothly to a pelt of darker fur across her shoulders. The beginnings of a muzzle shaped her student's nose and mouth into an increasing feline form, matching the cat-like ears that were canted back in obvious pleasure against Hermione's skull.

Minerva's animagus-clouded mind had never seen a more lovely sight.

"You are beautiful, Miss Granger." she breathed out, gazing into almond-shaped eyes, the irises of which were now lightening to a golden tint.

The young witch purred in response, kissing the older woman's lips again with a more tender touch before moving down off the sofa so that she knelt in front of Minerva. She picked up her teacher's wand from the low table beside them and whispered a spell that banished the Transfiguration professor's robes to a nearby chair, leaving Minerva clad only in a half-open white tunic and panties, her flushed expanse of pale skin exposed. The lower garment was slipped off by the brunette not five seconds later, and pushing the taller woman's long legs apart with faintly paw-like hands, carefully avoiding snagging her with her new claws, Hermione leaned in with a hungry look on her face.

The Headmistress could only watch in silent astonishment, her heart pounding like a drum. She felt utterly powerless against...whatever this instinct was that was driving her animagus to...

"Ah!"

The brunette's rough tongue had lapped at the slick area once, almost experimentally, and Minerva's hips rose off the sofa with a jerk. Another lick, this time a little to the left, elicited a strangled sound that told Hermione she had found the right spot.

A third upwards stroke to the same place threw Minerva's head back.

A fourth jerked it to the right.

"Hermione," she gasped, clutching at the seat cushions with white knuckled fists.

The whiskers tickled her tensed inner thighs as a wonderful warm tongue lapped at that perfect spot again.

"Oh...yes." she purred out, eyes shutting tightly, slim legs spreading even wider, her toes curling into the carpet.

Again.

And again.

And again.


When Minerva next opened her eyes, the last tremors having subsided and an overwhelming feeling of exhausted but sated pleasure filling her being, she was in for a shock.

Hermione Granger was sitting on the carpet cross-legged, wearing a bra, panties, and a very satisfied smile. The brunette's hair was quite mussed, but otherwise she was her normal, tail-free, de-whiskered and very human self.

Minerva stared down at her student in disbelief.

"Hermione...how?" she managed to choke out when she finally found her voice again.

"A Weasley's Wizard Wheezes product that I agreed to test for George. A customized charm that 'guarantees a scintillating encounter or your money back', or at least that's what it says on the cardboard box that he sent me this morning by owl. A present in return for a bit of help that I gave him last summer."

"But..."

The Head Girl gave a soft smile and stood up gracefully to close the distance between them, moving one bare leg across the slim woman's lap so that she straddled her on the sofa. Leaning in even closer, Hermione dropped a gentle kiss at the corner of her astonished teacher's mouth.

"Clever bit of magic to use your animagus traits against you –" she murmured. "I'll have to congratulate him; I wouldn't have ever thought of that. I'm glad to have been wrong, though – I've wanted to do this for years...with you, I mean. And that way was quite...sensual, don't you think?"

For once in her life, Minerva McGonagall was struck speechless. This lack of verbal response did not seem to bother the brunette at all, and she moved her right hand up to stroke the other woman's face.

"Now. I do believe that we have some unfinished business, Professor." she whispered into Minerva's ear, her fingers drifting along the delicate jaw line, smiling as the woman shuddered at the touch. "You've had your turn..."

"What?" came the breathy reply.

Hermione's hands had moved into the witch's hair, one set of fingernails running in soft lines across Minerva's scalp as the other hand slowly removed the pins holding up her teacher's bun one at a time until the long dark locks tumbled down over naked shoulders. She encountered no resistance at all.

"I do have one question, Professor."

Hermione's lips had curved into a sly smile. At that moment she looked even more feline that she had with fur and a muzzle; her face the very picture of a 'cat that ate the canary' look.

"Mmm?" The elder woman was clearly distracted, her emerald eyes half-lidded with pleasure as her hair was stroked smooth.

"Are you able to partially change into your animagus?" Hermione had moved lower to nuzzle Minerva tenderly under her chin, lips trailing down the elegant throat before she continued with a whispered; "Fair is fair after all, and I bet you would look wonderful with a few...additions."

Her hands had dropped down below her teacher's long back, slipping down to caress the area in question.

There was a pause;

"Shall we have a practical demonstration, Miss Granger?" Minerva purred lowly before meeting smiling lips with her own, already starting to lengthen her own tailbone under her student's eager fingers, soft silver hairs growing across her pale skin.


AN: Awesomesauce with a cherry on top. Now I've got that out of my system, I can continue on with my life. I welcome any and all reviews, even if it's a short 'Eew' or 'Yum' or 'Die in Satan's realm you twisted bitch and pass me some brain bleach' from an anonymous reader . I've disabled the profanity filter so be as creative as you'd like with your insults. Have at 'er.