(F to Dog)

“Some people say that you can’t improve upon perfection. But, you know… Some people are also idiots.” Chess uncrossed her legs as she spoke. “I’m sure you’ve heard of at least some of my spells; maybe even my shop.”

“Of course,” Katie cooed. The blonde dripped with confidence, and for good reason. In addition to being one of the most powerful witches in America, she was also one of the most attractive. No doubt the latter had something to do with the former.

This power was what had driven Chess to seek Katie’s tutelage. If the witch could make herself look like this, the effect she must have on others would have to be beyond belief. ‘Naturally, I must have that.’ Chess thought.

Katie continued, leaning in close and looking at the freckled brunette predatorily. “I’d imagine that most anyone who’s travelled to Europe has heard of Chesshire, and the little shop she runs.”

Chess preened herself on the compliment, sitting a bit taller in her seat and smiling with pride. “Oh, I do what work I can. Though I have to admit, your business makes mine feel a little unorganized.” She casually gestured to the room around herself. It looked like a therapist’s office, neat and organized. The room was a far cry from Chess’s cluttered storefront.

 “Indeed. Though to be fair, nobody really expects order from a novice like you,” the witch hummed with a patronizing grin. Her smile widened as Chess’s expression soured. “Ooh, have I touched a nerve? If that got to you, you won’t stand my little test.”

Chess took a deep breath to calm herself, remembering how just moments before, she’d passed a cow in the witch’s waiting room. Katie had enough would-be apprentices to make a business out of their attempts to impress her, effectively making them pay to be transformed.

Enough people had been transformed in their pursuit of glory to fill a zoo three times over. But there was a difference between Chess and the rest: those losers didn’t have her raw talent. Or so Chess assumed.

“About that test,” Chess asked, trying to get the conversation back on track. Her chest felt a little tighter, her body felt a little warmer. “When are you going to start? Not to sound too cocky, but I think you’ll be suitably impressed.”

Nobody knew what sort of trial Katie put people through, only the results. Just to be on the safe side, Chess had studied her transformation spellwork, practiced some magical dueling, and even refreshed herself on basic application of potions.

Katie hummed curiously, and Chess fidgeted in her seat. She felt a little warmer under her collar and itched at her neck, not noticing how small, short hairs were slowly starting to rise from her skin. The growth was subtle, just enough to give her a tan and white pattern across her body. It was especially pronounced on her face, the tan hair creeping from her forehead to her nose, only to turn white from her cheeks down.

Gentle as it was, the change was enough to make Chess feel uncomfortable in her seat. She fidgeted from side to side, chewing on her lower lip in an attempt not to give in and scratch her tingling pores. ‘My tingling… Pores?’

Chess finally put two and two together, and sent a casual look down to her arm. Sure enough, it looked almost white thanks to a soft and downy coat of short fur. ‘Oh, that bitch,’ Chess thought, forcing a smile to her face. “So, what? You’re going to see if I can resist a simple transformation? You might need to do better than that.”

“Careful what you wish for,” Katie replied with a low chuckle. “It’s not as ‘simple’ as you might hope.” Katie lifted a hand palm-up, circling her fingers in the air.

It was like someone lifted the room’s temperature immediately. Sweat dewed along Chess’s body, and she wiped at her furry brow, matting down the short hairs. Still, that wasn’t enough, and she found herself taking deeper breaths in an attempt to cool her body. “Haah… haah… And what makes you say that?”

‘Crap. Not good.’ Despite her feigned confidence, Chess knew she might be in real danger here. She hadn’t even felt a trace of magic from the other witch, and yet her changes were getting worse. Any witch could overwhelm someone with magic and force them to change, but it took real talent to use spells stealthily. Katie’s spellwork really was top-tier.

But Chess wasn’t one to be outdone. She concentrated and let a little energy course through her body, cooling herself down. The young witch was careful not to move or give any sign that she had used her power, but she knew her older counterpart had noticed.

“I can see you have some talent, but that’s not going to help you here,” Katie purred, leaning back in her chair. She spun her fingers lazily, and a blue ring appeared on the floor beside her, a magical circle lit by her power. “You see, this happens to be more than a test of your magic.”

The heat rose within Chess’s body, and she swayed in place. Despite her cooling spell, she was burning up, skin warm, heart pounding. ‘It’s like I’m horny, but… Why now?’ Chess pressed her legs tightly together, now noticing a dampness in her panties.

“I’m testing your willpower. All of the best spells come from pure, instinctive lust.” Katie flexed her palm above the magical circle, and it glowed brighter. Corposant energies crackled about it, and a glowing shape emerged from within its depths.

“Guhn…” Chess’s tongue felt swollen in her mouth. She let it slip past her lips, only to whimper as she felt it slap against her chin. She lifted a furry hand, curling her fingers around the appendage and holding it up before her startled eyes. “W-wghymmy tongue sho big?” She slurred around it.

‘I wonder what it would be like to shove this massive tongue into my burning puss-no! Can’t think like that, stop it. You’re better than that.’ Chess whimpered, still holding her tongue in her hands as she looked to the other witch. ‘Just need to hold out. This will be fine.’

“Your tongue’s so big because you’re becoming a dog, more specifically a Shiba Inu,” Katie explained mockingly. The creature she was summoning became whole, and the glow around it faded. It was an Alaskan Malamute. A male Alaskan Malamute.

‘Look at that red cock…’ Chess’s thoughts turned towards the animal, who looked back to her with a surprising intelligence.

“Ah, and there she goes… Poor little witch, playing with fire. Don’t worry, my sweet pet Davey’s quite the gentleman. Or at least, he used to be. Now, I call him out for trials like this.” Katie stroked the fur on the dog’s head, ruffling his ears.

At the same time, Chess’s ears twitched, drawing longer into triangular points. The girl whimpered, pawing at them with one of her hands and feeling how big they’d become. ‘Trials? I want him… No, but…’

A high-pitched whimper filled the room, the sound of a needy, conflicted dog. It took Chess an embarrassingly long moment to realize that it came from her own twisting throat. “Hhyy… I nughheed to go…”

Chess tried to stand, hoping she could retreat with tail tucked between her legs figuratively, and not literally. To her surprise—and if she was honest, her disappointment—Davey didn’t pounce upon her, pinning her down. Instead, he simply remained at Katie’s side, panting eagerly.

“Oh? Leaving so soon?” Katie chuckled. “You’re free to go if you want. But then you’ll never know what it’s like to be knotted by a big, strong dog like Davey.”

Each word was like an arrow to the heart, and Chess’s fumbled steps wobbled as she drew closer to the door, to salvation. She looked back over her shoulder, only to stumble and fall onto her hands and knees. The girl whimpered, choking out a sob as she realized how right it felt to be on all fours.

‘I want him inside me so badly, I want him to mount me and fuck me and breed me swollen and…’ Chess whimpered, pawing at her ears, squeezing her eyes shut. Her nose twitched uncontrollably, and she opened her eyes again in time to see it stretch away from the rest of her face, darkening and flattening into a wet canine snout.

“Oh, poor thing. Don’t worry, Davey won’t force himself on you, even exposed as you are. I left him with enough of a mind to know better. See, he’s going to wait for you to beg him to knot you. And you will, I can already tell.” Katie explained Chess’s predicament in no uncertain terms. It wasn’t a matter of ‘if’ to her, it was a matter of ‘when.’

Chess hated that. She bared her lengthening canines, turning towards Katie and growling. “Rrrhy’m nawwrrrt uh dawhug!” Every word came out mangled by her changing throat and her lust-addled brain alike. She couldn’t focus enough to try to enunciate her words.

‘Focus, you’re a witch. You can change yourself back to human again. You’re not some horny dog!’ Chess thought desperately, trying to pretend that her pep talk didn’t sound like a half-hearted plea.

Her fingers and toes wiggled and spasmed, swelling and shrinking at the same time. They grew larger and rounder, and yet pulled back towards her palms and soles respectively. Even those were changing, swelling with lush paw pads that sank deep into the carpeted floor.

“You’re not a what?” Katie cooed.

“Dawwhh… Huhuhuh…” Chess had to pause to pant, her long tongue flopping from her mouth. Each breath made her fur grow longer and longer still, until it covered her like a thick, warm coat. “Ghhuhuhh-dahhuh… Dawwoooghuh! Hyyym Chusss!”

‘Fuck I’m so hot I’m so horny I’m so hot,’ Chess’s thoughts were slowly simplifying as she crawled forwards on all fours, her body shrinking all around. It was like she was being squeezed all over, shrinking into a body that was able to crawl free of her clothes.

“Uhuhuhh,” she panted moronically, crossing her eyes and trying to look at her tongue. ‘Tongue so big… In the way… Would be better in my pussy… No! No?’ Chess groaned, squirming as her limbs twisted, shrinking.

Her warping body let her look closer at her swollen, heat-laden spade. She hadn’t even felt it change, but her vagina was less ‘pussy’ and more ‘puppy.’ It was so hot, and she had the perfect way to cool it…

Loud, wet smacking filled the room, Chess’s overlarge tongue clumsily slapping against her honeypot. She was getting better at this with each and every lick, applying pressure in the right places, dipping her tongue in a little deeper and deeper still…

“GROOF!” A loud bark snapped Chess back to the present, and she looked up to see Davey pawing the ground eagerly. The Malamute was so much bigger than her now, and Chess fantasized briefly about being pinned beneath his strong, hot, musky body.

Musky… Chess’s eyes glazed as she sniffed at the air, drinking in his scent. On some level, she’d certainly noticed it earlier. There had been something in the air that had filled her with need and desire. But now, now that she was focused fully on it…

‘Want.’ The thought was a primal, base need. Chess pressed her breasts against the floor, squishing them back into her body, forcing teats to bud from her belly. She lifted her ass, and a long and fluffy tail burst from above her furry cheeks, just so it could fan her needy scent into the air. ‘Want. Want!’

“Aw, does the little bitch need to be knotted?” Katie cooed, voice dripping with arrogance. The blonde looked to her dog, chuckling and nodding. “Go get her, boy. But… Be a tease about it.”

Davey needed no further encouragement. He eagerly bounded towards the Shiba, who yipped softly, pleadingly.

‘YesyesyeshornyChess!’ Chess panted, slobbering, slavering at the thought of being knotted so full that she’d have a full litter of puppies. She lifted her ass, whimpering, begging. She cried out with pleasure as she watched his shadow loom over her, and as she felt his warm furry chest press against her back.

But he’d heard his master, and instead stopped just short of penetrating her. Instead, he leaned into her, pressing his hot cock against her sex. His muzzle dipped down towards her ear, where he panted gruffly, enticing her.

A moment of clarity returned to Chess. Some life flickered back into her eyes, and she looked up to find Katie gazing deep into her eyes. “See? You’re weak. If you tried to handle real magic, you’d be utterly consumed by it. Consider this a kindness—or don’t. Soon you’ll be too dumb to care.”

“Huhuhuh, bghhuh… Buhhrritch! Muh-mhrrk meee hooomawn!” Chess managed for force her muzzle around the words, desperately trying not to think about the fact that she was just a thrust away from having her every need sated.

“Sweet child, you know how this game goes,” Katie reached down and stroked Chess’s furry cheek. “And you should know, you’ve already lost. There’s no second chances here, so why don’t you go and get fucked like the horny mutt you were always meant to be?”

The worst part was: Katie was right. Humiliated, shamed, Chess still could only think about how damnably horny she was; how she’d never been this horny in her entire life. She realized fully what she was doing as she pressed needily against Davey. She looked up to him with still-intelligent eyes, pleading him to fuck her with a whimper.

“Puhuhuhleese fuh-fhhugh mhyyyn!” Chess begged. ‘I can’t believe I’m doing this, but I’m so horny… I need him in me, he’s such a big dog, and I-’

Her thoughts were cut off as the Malamute slammed his massive cock into her, lifting her back paws from the ground. For a moment, all Chess saw was bright light as her brain was nearly driven senseless. Stars still danced across her vision as it returned, though by then her eyes were glazed and unfocused.

Thoughts of being a witch disappeared from her mind as she howled with pleasure. Thoughts of being a human soon followed, as she rolled her hips back against his, clenching tightly around a dick so big that she could feel it hitting her womb.

‘Fuck! Full! Right there! Big doggy fuck harder!’ Chess’s jaw hung slack, her tongue flopped past her mouth. Drool slobbered past her dark and rubbery lips, but she was long past caring about that. “GUHuhuh-arf!” She vocalized, the sounds coming from instinct rather than intention.

She was a Shiba Inu bitch, she was so full, she was knotted to her mate. What little brainpower she had was caught in a loop, one that refreshed with his every thrust. Every time his cock touched her womb, another powerful pulse of pleasure tensed her every canine muscle. She was soon a limp, insensate, slobbering mess, whining between feverish pants.

Davey moved faster, harder, pushing his cock deeper into Chess’s body, so far that she felt she might break around him. He leaned down, pinning her beneath him, rubbing her sensitive teats against the carpet. It was enough to drive Chess past the edge. “AH-AHWROO!” She howled, riding a wave of pleasure and still desperately craving more.

Her mate didn’t disappoint, treating her like a furry fuckdoll, humping her so hard that his thrusts drove the wind from her lungs. His knot bulged and his dick throbbed, a low growl building in his throat. Chess was too dumb to know what would come next, but her body did.

She instinctively clenched her dark folds around him, rolling her hips. She wasn’t disappointed, as his hot seed spilled into her womb, filling it, filling her. Her eyes crossed, her tongue flopped from her mouth, and she joined him in a howl of release.

‘I… Full… Mate…’ Chess’s dumb brain was utterly content, and she slurped her tongue back into her muzzle, looking up and giving Davey an affectionate lick. ‘Full…’

Katie knelt down in front of the Shiba Inu, cupping the dog’s furry muzzle in her hands and looking deep into its eyes. She didn’t see anything left, not a single trace of the witch who’d walked into her office. “So much for that,” she purred, clicking her fingers. Davey’s body glowed, and he let out a contented bark before she fully unsummoned him.

‘Full? Empty? Mate?’ Chess blinked, looking behind herself in confusion. She blinked a few more times, before looking up to the witch. ‘Human! Master? Master?’ She barked eagerly, wagging her tail, cum still dripping from her dark pussy.

“Clean yourself off,” Katie commanded.

The words weren’t fully understood, but their meaning was. Chess dipped her tongue between her legs, and she cleaned herself free of the rut that had stolen the last of her humanity. Then she returned her attention to the human, who was waiting at the door.

Katie opened it with a smile, looking to the other witch in her waiting room. “Oh? Are you my next candidate?” She moved the door a little wider, so that the girl could get a good look at the last witch who’d tried to impress her.

The witch gulped, remembering the cocksure freckled brunette that had loudly proclaimed she’d “surely be Katie’s apprentice.” Now that girl was just a dumb dog, too stupid to remember anything besides her name.

“Second thoughts? I should hope so, Chess here could use a new owner,” Katie said, and laughed as the witch nodded. “Smart girl. Fair warning: this little Shiba’s pregnant, so you’d better get ready for that.”

Chess had no idea what the two had just talked about, but the other human felt right to her. ‘Master! Master!’ Chess panted happily, padding over to her new owner and nuzzling against the girl’s leg.

“Now, run along, you two.” Katie didn’t wait to see if they listened, closing the door to her office. She looked down at Chess’s empty clothing, still stained with her sweat and a few tufts of fur. Then she evaporated the mess without a second thought.