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There was no such thing as a perfect plan, as Clark was about to discover.

He'd done his research, and felt confident in his knowledge of the ritual he was about to perform. He had to keep all of his work a secret, but to the best of his understanding, no one had any idea what he was up to.

At worst, there might be an inkling of his devious intentions, but the target of his spell couldn't have known what he was planning for them.

"As soon as she comes through the door, powder will fall from the door and coat her...the fur will cling to her skin, the transformation will begin, and nothing will be able to stop me from making the perfect lover..."

His words were rigid, his voice was deranged, and a frightening blend of chaotic and carnal. Whatever drove Clark to go after his own sister for the target of the spell, she never would have been able to guess, but she didn't have even the slightest inkling of what was in store when she stepped in the front door from her day job.

She was already in a frustrated mood when she slammed the front door open, but when she cocked a brow at her brother's odd dress and posture, she looked up and was met with a smattering of white powder and dark, onyx follicles of wolf fur.

"...Clark, I don't know what the fuck you think you're doing right now, but if I were you, I'd start running..."

By age, they were about as close as siblings could naturally be, but by the virtue of their interpersonal relationships, they couldn't have been much further apart. Millie was looking forward to starting her life away from home after she finished up her degree, but her brother and his immaturity sucked all of the fun out of staying at her parents while she waited for the right time to leave the nest.

If it were up to her, she would have been long gone already.

"I won't be able to outrun you," Clark admitted, "But it won't matter; you won't be able to resist me once I finish this spell!"

The twisted desires of a shut-in young man were manifesting upon the vessel of his own sister. A tall, buxom wolfess was the one thing that he desired in life that he simply couldn't have, and in his desperation, he dug up every spell book and reference page that he could find, believing that one of them would hold the answer to turning a woman into the creature of his dreams.

Sexual frustration left him blind to reason, and his own sister became the target of the test spell.

"Uh huh. Yeah; definitely gonna start kicking your teeth in, now!" she warned him, but as she slammed the door behind her, Clark lifted his hands to the ceiling and started chanting, bringing an eerie glow of moonlight blue to rise from the floor.

She was standing in the middle of a magically enchanted circle, and as the light surrounded her body, small clouds of white dust and clumps of fur floated up from her skin. She had trouble believing that her brother was capable of doing anything right, but the fact that he'd successfully trapped her in a magical field wasn't just difficult for her to believe: it was downright impossible.

"Forgive me for taking you as the necessary sacrifice," Clark muttered. "After an entire lifetime of being such an obnoxious bitch...consider this your reconciliation."

Naturally, she didn't remember their interactions the same way he did, and in her mind, anything she'd ever done to him was justified. She was of a mind to step out of the circle and throttle him just for pouring the bucket of nasty ingredients on her in the first place, but her body was trapped by the field, restraining her even when she gave her all to taking a single step in his direction.

She didn't understand what was happening, but from the floor up, she could see her body starting to grow, as her toes burst through the durable seams of her work shoes.

"Clark, I...I don't know what the fuck you think you're doing, but this spell is tearing up the house!" she exclaimed, warning him about the danger he was getting into, even when she hadn't accepted it as reality just then. "Our parents are gonna kill us if they see what you've done to the living room!"

"Pfft. Once you've become my right-hand bitch, I won't have to take criticism from them, or anyone else..."

He was beyond reason already, and more concerningly, he was beyond patience...but his haste was ultimately his downfall, as he looked down to the spell book and began his chant.

For all of his years of planning and accumulating resources, Clark didn't notice the gust of wind that came when Millie slammed the door...turning his spot in the book back a few pages.

"Lupine royalty, grant me strength beyond man! Share with me your power, your speed, your cunning and lust!"

The fur continued to swirl around Millie in clumps, but as she tried to shield her eyes from it, she felt tufts of the same dark product growing from just under her skin, at the balls of her feet. Crawling up her ankles with a slow, painful itch, she looked down and noticed her body thickening, so much that her work uniform was pushed to the limit; her limbs were further immobilized by a prison of fabric as Clark continued, ignoring the panic in her eyes.

"Reward my sacrifice and honor my wishes! Give me the will of the pack, the pride of the lupine, and the dominant spirit of the wild!"

At the start, the ethereal light of blue that surrounded Millie was soothing to look at, despite the seemingly demonic source that it was being drawn from. As he finished the incantation, however, Clark saw a red mist, akin to spattered blood, emerging from the floor and tainting the subtle moonlight.

What he'd originally attempted was a druidic spell: one that could not only be reversed, but didn't actually require a proper sacrifice. Most of the changes were aesthetic in nature, and his sister would have been spared from anything truly permanent.

Because of the gust of wind that turned the page, he'd crossed over from the druidic rights into black magic...and his sister's soul was being taken away in exchange for the power and lust that he demanded.

Thanks to his lack of foresight, his jaw nearly dropped to the floor when the thing that forced her pants to tear wasn't the growth of her hips, or the widening of her backside...but instead, was the presence of a wide, thick sheath, complete with the reddish tip of a canine cock forming.

He trembled with earthshaking concern when he realized that it was so large, it had burst through durable clothing...and it still wasn't done growing yet.

"You already had a lot to answer for, Clark..."

Millie's voice was once high and sharp, but as the transformation took hold of her body, it continued to ravage every part of her, even down to the voice she spoke with. She tripped over her words as long, deadly fangs spread her lips further apart than they were meant to move, but a growing muzzle was starting to accommodate their jagged danger.

She was still very much a work in progress, but there was clearly something wrong with the spell, given the other part of the botched transformation.

"But if you think I'm gonna let you off the hook for what you've done to me...you're even fucking crazier than I thought you were!"

The twisted dream in Clark's mind was that of a tall, buxom wolfess that would bend to his every whim, no matter how demanding or perverted. Desperation lead him to make his sister into that target, and one tiny, improbable oversight had thrown a wrench into months of planning, so much that he wasn't sure how to move forward from there.

As he tried to contain his panic, Millie tried to adjust to the thick, resilient muscles that were running up her arms and spreading across her upper back. Shoulders that looked as though they could carry the weight of the world spread behind her neck before the long, shaggy coat of fur upon the rest of her body began trailing up her spine, moving to cover the impressive flesh.

Even with the fur atop her upper body, Millie was becoming an incredible specimen, and one that could intimidate her brother with a number of different tools.

"What's the matter, you little pussy? You don't have anything else to say for yourself?" she asked, learning to speak around the rows of uneven fangs that filled her newly formed muzzle. "No witty comeback for me this time? I'd just love to hear what you have to say to the monster that you helped to create!"

Keeping up with the changes, and the reality of them happening to her, was a difficult enough task for Millie...but she grounded herself by grabbing onto the one emotional constant of the experience.

Blinding, blistering rage roiled over in her spirit and kept her mind from going completely blank. Furious eyes stared down at the smaller, weaker human, and as if her legs knew her intentions better than she did herself, they began carrying Millie closer to her now much littler brother.

"If you don't say something really fucking fast, I'm going to rip those stupid looking lips off your face and have them for a snack, Clark."

Looming over her brother with a large, hulking form, Millie glanced down at caught her brother marveling not just at the impressive musculature she'd gained, but also the hanging girth of the cock that came along with the completed transformation. Millie was completely converted to a male by that point, with the last remnants of her womanhood reduced to large, flat pectoral muscles, all hidden by a coat of fur. Tattered clothes remained around where she once stood, and in the back of her mind, she was grateful that Clark wasn't privy to seeing all of her nude glory.

Now that he was wielding a cock, however, Millie was perfectly fine with showing off and making his brother feel completely inadequate.

"This...t-this wasn't what I was going for at all," Clark confessed, only temporarily abating his fate. "I don't know what went wrong, but I promise I can fix it, Millie! Just give me a chance!"

"I walk in the door, and you start my evening at home by casting a spell on me against my will...and turning me into this," he growled, even angrier that Clark would act like he knew what he was doing. "I'm not sure what you were going for, but if this was the wrong result, I don't trust you to fix a fucking thing!"

"If you'd just give me a chance-

WHUMP!

The weight of a massive paw came shooting at Clark, attacking him from shotgun range. His whole torso was encompassed by the palm of the frustrated werewolf, and the wind was knocked right out of him as he slammed down against the floor. The floorboards actually cracked under the impact, leaving the foolish human in a world of agony and nausea; he wouldn't be moving anytime soon, even if he was given the chance.

One of Millie's footpaws came down to make sure that Clark would stay put, and with his new reach, he easily pulled the spell book from the floor and began thumbing through it. "Now, let's see...you were clearly going for this spell," he muttered, as he dragged a claw across a passage that mentioned turning a woman into something more than a human could offer to her potential lover. "But when I opened the door, the breeze must have flipped the page on you to this list of forbidden spells; thank goodness we aren't this sexually repressed anymore!"

Clark was too terrified to ask why his new brother felt that way, and his lungs, crushed under a massive footpaw, could scarcely draw enough air to stay conscious.

"You're a progressive guy, right? Not the kind of sick fuck that would try to trap his own sister into a life of sexual slavery...no, you'd be all about these spells!" he continued mocking Clark, as he gazed over the invocations and listed effects. "Affinity for the oak...and master of the wolf...wonder what would happen if I combined these two?"

'Master of the she-wolf' was the original spell intended for Millie, when he first came in the door.

After botching the incantations completely, Clark was living in a prison of his own design, tortured by the results of his own failure. He was too arrogant to consider it a fitting punishment for what he'd attempted, but that didn't stop him from wallowing as his new, big brother started reading from the pages.

His voice, however, came out in a series of low, ferocious growls, reading through the text in a long-forgotten tongue of the transformed lupines. As he spoke, the words left Millie's tongue in the form of a glowing aura, before they flowed up from his muzzle and drifted into the air. Their essence appeared to dissipate, until it settled on Clark's injured body; both spells were already complete, and already taking effect.

"Can't wait to see you cum in your pants...fucking pervert."

Dipping his toes into the pool of such corruption was a foolish move, but Clark didn't expect that move to haunt him so completely as it was. Millie picked a spell specifically to torture the young man with pleasure, but it wasn't just the bliss of an orgasm that he would experience.

For being granted the spell by a wolf, even before he started to change into one, his cock lunged awake in his pants, jamming up against the front of the trapping denim. Another pulse went through his stiffened rod, and from the tip, cum was already beginning to gush...but the enchanted orgasm came with a side effect that he didn't anticipate.

Like plenty of other men, Clark felt the tip of his cock was a painfully sensitive right after an orgasm, so much that having it touched was genuinely uncomfortable.

As that climax wracked his body and seed spread across the front of his boxers, he squirmed with humiliation...but the cackling laughter of his brother above covered up a pathetic whimper from below: the sensations from Clark's orgasm were centering on the tip of his member, and no amount of wiggling or squirming was doing anything to dull them.

Every sensation from a long, masturbatory session was compressed into the space of just a few seconds, providing a feeling so intense, he nearly blacked out from the outright discomfort of it.

Pleasured whining was drowned out by Millie's triumphant laughter, and when he felt cum bubbling up through the front of Clark's jeans and staining his pawpads, he looked straight down with a furious glare.

"I hope you know you'll be licking that out of my fur when we're all done," Millie growled, taking on the very role that Clark once hoped to hold over him. "And you'll have a much better tongue for the job, in a moment..."

Millie's revenge wouldn't be complete until he speared his perverted, smaller brother on his cock and made him feel the same humiliation that he'd known before...but seeing how small Clark was, he couldn't risk penetrating him in a human form.

After all, Millie didn't want to kill his brother for what he'd done; he could only make Clark pay for his transgressions while he was still alive, and after the botched spell, Clark had a literal lifetime of sins to pay for.

"Millie, p-please...please just let me up!" Clark begged. His voice was authentically weak, but his pathetic cry did nothing to sway his brother, who only pushed harder at the request. "If you let me up, I can...I can fix all of this!"

"Gonna be really hard to fix anything when you're busy bouncing yourself on my cock, Clark. Should have been a little more careful what you wished for..."

The nature of the spell that befell Millie, despite being the wrong spell, was still to provide him with a corrupted nature. The idea of committing an incestuous act would have been repulsive to the girl that first walked in the door...

...The idea of fucking his brother in the ass was empowering, fueling the erection of the beast that Millie had become.

"It's not t-too late to stop this, Millie! You wouldn't...y-you wouldn't really fuck your own brother, would you?"

"Maybe you should have asked that about your sister, first."

Millie lifted his foot from Clark's chest, granting him the final breath he'd take as a pure-blooded human. As he sucked in panicked air, new vitality spread throughout his form, and veins popped up to the surface of pale, tender skin.

Muscles teased their presence at the surface where there had been none before, and from the top of his head, hair was spilling down and over his face, growing in such rapid fashion that magic could be the only explanation for the outpouring.

It was fascinating enough for Millie to watch, but much to his delight, Clark wasn't trying to run away when he was given the chance; thanks to the unique blend of spells that were cast upon him, his legs couldn't carry him away, even when his mind was screaming at them to run out the door and as far away as possible.

There was only one wolf in the room when the first spell was cast...and Clark couldn't resist the magical force that took hold of the new, powerful muscles that surged into life around his elongating skeleton.

"Months of research and planning, hm? I read the passage one time and managed to turn you into my own personal bitch," Millie teased. "Though, I won't know how well the spell worked until you get on your knees like a good little slut...and lift your tail."

When the order was given, there was no tail for Clark to lift...but that wasn't going to last much longer. He could already feel the stretch in his spine, and after just a minute, the flesh around his tailbone started to stretch. It wasn't forceful enough to break through his jeans, as Millie's had been, but he was more than happy to lend an assist, as his claws tore through the denim and shredded the pants away from his little brother.

"Figures. I've had one for less than a day, and mine's already a lot bigger," Millie joked, seeing how much longer his throbbing erection was than the still-soft flesh of Clark's transforming member. "Not that it matters too much: you already got your first orgasm out of the way. Far as I'm concerned, you didn't deserve the first one and you certainly don't deserve another."

As fur crawled up the front of his growing forearms and covered his suddenly impressive biceps, Clark thought to beg for some kind of mercy, but no matter how he tried, the words wouldn't escape his changing face. It wasn't the struggle of learning to talk with a muzzle that precluded him from responding...but the magical energy that swirled around his lips and tongue as he spoke.

No matter what sound his mind told his mouth to make, he could only beg for one thing from his new brother.

"That's...f-fine," Clark said, even if he didn't mean it. "I just wish to serve you, Millie...to be a g-good...bitch..."

His tone was weakening as he spoke, demonstrating how hard he was trying to fight back against the magic; his every effort proved fruitless as Millie dropped to his knees and gripped the base of his forming tail.

"I didn't think you'd come around so soon! Lucky for me, too...my cock was getting ready to burst," Millie warned, pressing the massive, tapered tip of his newly formed member up against the cheeks of Clark's changing backside. "It's a real shame you've already proven yourself to be pretty worthless; not that you can really mess up being a cum dumpster, but if anyone could find a way to fuck it up, it'd be you, little brother."

Such vicious mockery should have destroyed what little confidence Clark had left. Instead, it fed the magic that worked through his body and forced his hips to wiggle from side to side, enticing the larger werewolf to work out his frustrations on an underprepared tailhole.

"I'll do...m-my best," he offered, his voice as weak as ever despite the lupine strength that surged through his new form. "Anything for my big brother...my master."

The spell was working to perfection, leaving thick, heavy muscles and dagger-like claws completely useless on Clark's body: he couldn't use them if he wanted to, and the last human emotions to remain in his new form were those of self-deprecating guilt.

"Anything, eh? Look at the ground, lift your ass and shut the fuck up so I can enjoy this," Millie ordered, and even before Clark processed the commands, his back was arched and his backside was lifted. His asshole was already spreading around the oozing tip of Millie's cock, but once he was lifted to a proper level, he held still and felt the tip press further inside, until his wish, in a roundabout way, had been fulfilled.

Grabbing the base of his tail tight and holding it like a sturdy handle, Millie rolled his hips forth and eased a few more inches into the waiting entrance, finding that the magic alone would force Clark's body to accommodate him. Millie was gracious enough to let some of his saliva spill down to the lower end of his shaft for unnecessary lubrication, but once that moisture had been forced inside of the smaller werewolf, the larger one refused to slow down, even when Clark's eyes were pleading for mercy.

As a final reminder of just how blatantly he'd ignored Millie before, Clark's new brother met that stare with an intense look of lust and fury, and the next thrust expressed those feelings perfectly, sending the entirety of Millie's rod into his brother's asshole and the weight of his full, swollen orbs into a pair of trembling thighs.

"You're quivering too much," Millie criticized, refusing to let Clark doing anything right in the aftermath of the spell. "Hold still so I can enjoy ruining your ass, damn it!"

His demands were immediately met, thanks to the power of the perfectly recited spell. Even when Clark fought with all of his mental fortitude to resist it, he was instantly overruled by the stillness of his every muscle.

On his knees and whimpering like a pathetic pup, Clark felt the final phase of the spell shifting in his mind...as pleasure, much to Millie's chagrin, because spreading throughout his form. Without the spell for assistance, that was enough to make Clark pliable for his big brother, but Millie was still driving his frustrations into the full, round backside of the former human.

His original mindset of lusting after any woman he could get was destroyed and supplanted by the desire to be filled with all the cum that a man could offer him. Just having that thought process was unusual to start, but as the thought took hold in his mind, his tongue eased between his fangs, and his eyes began to roll back at the ongoing, forceful thrusts.

As he was fucked into submission by his own brother, Clark found himself loving every aspect of the treatment: the scent of their rapid lovemaking, the throb of Millie's cock as cum began erupting from the tip, the weight of a knot pressing on his virgin tailhole, and even the heavy, masculine growl in his ear left him weaker than he'd ever been before...until he could scarcely hold himself up for the finale.

Cum poured down the back of his thighs, staining his fur and dribbling all the way to the floor until a puddle formed under his sack...and just as it melted down his outsides, the spell melted the resistance that was left on the inside.

"Clenching on me like the brainless little slut that you are," Millie groaned, eager to find one last way to criticize his little brother before his balls were completely drained. "So much for not enjoying yourself. Now how am I gonna convince you to change me back?"

Utterly corrupted by the influence of the spell that was cast upon him, Millie was grinning at his own question.

He was more than happy to stay in his new body forever, as long as his little brother was there for him to rut on a nightly basis...