FSE

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Adina couldn't remember the last time she was able to walk in a straight line, and all told, she couldn't have been happier about that fact.

She was constantly bowlegged, thanks entirely to the potion that she'd slipped into her brothers drink only a couple of days before. Twisted as her desires might have been, she got exactly what she wanted when she tainted his beverage, and the day that followed was one that she'd never forget: the image of her hulking, musclebound brother towering over her as he pinned her to the floor was constantly bubbling up in the back of her thoughts.

The moisture it left on her folds was every bit as persistent, and with his sex drive still through the roof, it was no surprise that he was following her around the otherwise empty house and pounding into her body at every turn.

"No, I'm...I'm very happy with the product," she whispered into her phone as she hid behind her bed, having found very few places in the house that her brother couldn't hear her; it wasn't just his general physicality that was improved, but his senses were heightened, as well. "In fact, I think it's working a little too well, and a little too long. It was supposed to wear off after a day, wasn't it?"

Adina couldn't trust a source that she didn't know, and her friends couldn't trust the backstories that she kept making up about her disheveled appearance every time they ran into her. She made the repeated claim that she was on a hot streak with her dating apps, but her hair was always a mess, her fur was streaked and ruffled with claw marks, and all of it was coinciding with her brother's recent disappearance.

She wasn't such a dishonest person; just lying to herself that she wasn't sleeping with her brother because his body was transformed was a stretch for her, but when her friends asked her why she wasn't more concerned about his whereabouts, she was hard up for answers.

Trying to find them in a phone call wasn't doing her any good, either.

"How much of the product did you put into his drink?"

Adina had the box on hand. "The whole thing," she admitted, and even as the words left her mouth, she felt new dread creeping into her tone: the instructions were on the side of the box, plain as day. "That, uh...that was a bad thing, wasn't it?"

"If they were happy in their old body, they're gonna be pretty upset, yeah."

" How upset?"

"I'm guessing that you didn't administer the doses over a long period of time- no one does, so that means you gave them the whole box in one shot."

"Something like that, yeah. I...might have mixed it into his protein powder."

"So you incorporated the whole box into something that would be absorbed by his bloodstream...without reading the instructions."

"Sarcastic tone duly noted," Adina groaned. "Now how do I fix it?"

"You don't. I really hope they like their new body, because they're not coming out of it anytime soon."

Adina clutched her chest nervously. "And j-just what does anytime soon mean?"

"We don't have enough data to be sure of it yet, but as far as our product testing has shown, too strong of a dose right off the bat makes the changes at least semi-permanent, and you mixing it with the protein powder probably made things worse. Our oldest test subject is going on ten years now, and they haven't shown any signs of reverting to their old body whatsoever."

"So there's no way to fix this?!"

"There's a reason why I told you to follow the instructions, Adina. If you didn't follow them, you have no one but yourself to blame for that person being changed forever. Hopefully their personal contacts will understand the sudden disappearance."

She would have been thrilled with Achan staying in that body for a week. She could have lived with him being in it for a month. After a year, she would have started to worry.

Now that she knew it would be much longer than that, perhaps forever, she was completely beside herself.

"I'm gonna take your overt silence as an admittance that you gave it to someone very close to you, and that you probably ruined their life in the process."

"How can you possibly sound so casual about that?"

The man on the other end of the phone was grinning, despite the terrible news. "Sweetheart, I'm in the business of ruining lives...this is just another Tuesday for me."

Adina wasn't sure why she was hoping for someone more helpful than the shifty canine that sold her the chemicals in the first place, but he'd dashed those hopes all too thoroughly in the matter of just a few seconds.

"Maybe you come up with an antidote for the problem before you go spreading it around town, next time?"

"Maybe you follow the instructions next time! Although, I can't imagine you'll be coming back to me as a customer."

The poor girl didn't think to keep her voice down throughout her argument with the supplier, and the all too brief moment of peace and respite that she found was cut short as she felt a thick, clenching set of digits grip her by the shoulder.

"I don't think I'd recommend your products or services to a friend, no," Adina replied dryly. She tried to keep her gasp quiet, but the beast that she'd created was too much for her to handle when she had time to prepare for him; a sneak attack like this put her at such a disadvantage that she couldn't help dropping the phone as his fangs pressed into the side of her neck for a deep, claiming bite. "You have n-no fucking idea what kind of a m-mess you've gotten me into!"

The speaker kicked on as the phone hit the floor. The sound of Adina's cry of delight was captured perfectly as her brother gripped her from behind and slammed her into the wall, pinning her back beneath his chest, and her covered backside beneath his full, throbbing cock.

Since his change, it only took him seconds to be ready to go, and even after a long, brutal session, he'd be up and at it again within a minute; there was no end to his energy, and no shortage of seed, no matter how much he spilled inside of her.

"You got yourself into this mess, Adina. I can't be held responsible for you not reading the instructions!"

The man had no idea what he was really listening in on as Adina started panting with quiet desperation. Her body was all too susceptible to the domineering pheromones that her transformed brother gave off, and her own sense of need called out to him no matter where she was in the house.

This time, despite catching her in the bedroom, the bed was being completely ignored, in favor of something a bit more intense.

"Oh...o-oh fuck...feels like it's g-gotten even bigger, Achan!" she whimpered as his member rubbed against her lower back, spitting precum on the fabric of her thin, comfy t-shirt. "There's no way it'll...f-fit..."

At that, the coyote on the other end was quick to pick up the hint. He cocked a brow as he sat at his service desk and listened closely, turning down the speaker on his phone just a little bit. "Adina, are you-

"Yes!"

"Right now?"

"Why do you think I was calling you so early?" she growled at the phone the best that she could, but Achan kept stealing her concerns back to him, as his claws raked down the back of yet another shirt, ruining the fourth of her favorites that week. "I can't get him to stop...I thought I might be able to fix it b-before he woke up, but...I was too late!"

Juices were already leaking down the small of her back, but her body did all it could to match his impressive precum. Slim, glistening trickles of her liquid arousal poured down from the crest of her petals and soaked into the crotch of her pajama bottoms; she'd given up on wearing panties that week, after finding so many pairs ruined by her brother's claws.

She was torn between feeling like a hypocrite for complaining about his treatment when she loved it so much, and feeling like a monster for turning her brother into one and reaping the benefits of the same.

It doesn't matter what body he's in. This is still...incest, she thought. This is still me getting slammed into a wall by my brother...and...me loving every damn minute of it.

She'd have more time to contemplate the intricacies of her twisted mind when Achan was done with her, but as she knew by that point, he was never done after a single round, and those rounds weren't the quick, typical bouts that canines were used to.

Adina was never sure how Achan was going to take her, but this time, the surprise came when the weight of his thick, massive length backed off of her and he knelt down, showing a rare hint of submission to her.

That all ended when he yanked her pajama bottoms down to her ankles and spread her ass apart.

"Are you...in danger, Adina?"

It was the closest the man on the phone came to having morals, in the middle of an otherwise entirely immoral situation.

Adina might have been a step further gone than he was, as her claws raked at the wall: her brother's tongue slathered between her thighs, cleaning up her spilled arousal in wide swaths before turning to an impressively skillful push against the base of her entrance.

Tender petals spread over his wide, powerful tongue, gracing it with fresh nectar and encouraging him to go on. Either of his paws could have held the whole of her backside, but each paw took a cheek and squeezed it tight, keeping both of her holes exposed for his eyes to feast upon, while his tongue had a meal in the more literal sense.

Adina feared she'd cry out in orgasmic delight before his tongue even reached the sensitive nub that was her clit.

"Oh, y-yes! Fucking...l-lick my clit, Achan! Yes!"

Nope, the man thought. Not in any danger there.

There was a certain comfort in knowing that she could trust her brother with the overwhelming power that he'd been granted. It may have been twisted and even forbidden, but she could experience the fantasy of an unstoppable, insatiable beast taking her over and over again, with only her social reputation truly at risk.

Knowing that she could trust him, however, didn't fully take away the element of danger.

"Claws...c-claws!" she panted, feeling long, sharp chitin as it curled into the smooth, supple flesh of her backside. She whimpered and squeaked as his grip sent a sharp pain through her softer muscles, but under all of that subtle damage was a growing sense of urgency that wouldn't be settled by his tongue, alone.

She knew how wrong it was...she knew how shameful she'd become in her lust for it.

Somehow, knowing that she was helpless to stop him helped her to live with that fact as Achan pulled his dripping tongue from her pouted, eager labia and grabbed her from behind again; she wasn't going anywhere until his balls were drained.

"Not that it's any of my business, Adina...but...who exactly did you give that serum to?"

He didn't think he'd get an answer, but he was curious who the lucky guy on the other end of the call was, especially given the lack of words on Achan's part. He was more of the strong but silent type to begin with, but in his current state, he bordered on a feral beast, with just enough cognizance to know what he was getting himself into.

Even though he knew it was his own sister that he was grinding into the wall, his body felt such a terrible need that societal and familial boundaries were meaningless; he needed to get his fix wherever he could, from whoever he could.

Adina felt wrong in doing so, but she considered herself lucky to be the only one to run into Achan since the change. She was getting the very best that he could ever offer a woman, and though her body was still trembling with soreness from their last bout, her backside was already rolling against his hips as he angled them toward her entrance.

It was her fault that he was in such a terrible storm of lust in the first place; the least she could do, as far as she was concerned, was be his port of safety.

"Adina?"

She'd been ignoring the call for a while, at that point. She knew that one of the most depraved acts of her life was going to be at least partially recorded, but she didn't know that Achan's footpaw was grinding against the face of her smartphone, activating the camera in the process.

She never would have guessed that her brother's tip was spreading her folds apart for the lenses of a camera, instead of for the sake of his pleasure.

"I thought you were d-done changing," she gasped as her brother's palm rested against the back of her head and pushed her cheek into the wall, forcing her to stay pinned. "But it f-feels even bigger today...than it did last night...f-fuck, Achan!"

The man on the phone didn't know her brother's name, but the lack of noise from him, save for the low, hulking growl that emerged from his throat, left him grasping at straws for Achan's true identity.

Underneath the wall of muscle and sexual energy, her brother was still himself, and he wasn't blind to the taboo of his actions.

"You're gonna put me through that f-fucking wall if you're not careful..."

Acknowledging the forbidden nature didn't slow him down in the least: it emboldened his actions as his already impressive shaft continued to spread her womanhood further apart, treating it to such a heavy amount of flesh that she knew she couldn't handle it without more of a warmup.

His disregard for that fact was just enough of a turn-on for juices to spill down the inside of her thighs all the same, and his slow, yet _unstoppably_forceful thrusts gave her just enough of a chance to warm up before he started treating her like the bitch that she was to him.

She wanted him to let her bend over so she could be properly mounted...but she knew that wasn't going to happen. She was shorter than him in his current state, enough that her posture allowed for him to dominate her from whatever angle he picked, and there was no question that he was in control.

Her body was like a plaything in his massive, powerful grasp, and just when she submitted to having her body pressed into the wall, she felt digits covering her breasts and holding the front of her thighs. She couldn't stop him from pulling her body away from the wall, or forcing her paws to brace against the paint as he held her up on his cock and speared her.

She was helpless in his grasp, unable to do anything more than count the thrusts until his hips stole another orgasm from her passage.

"If you're really that occupied, I do have other customers to attend to, you know."

Adina didn't care if the man hung up or not. She was far past the point of worrying about someone finding out her dirty little secret with her brother, and as far as she was concerned, she needed to thank the coyote that supplied her with the drugs, if he was willing to hold on the call that long.

Given what he was seeing on his smartphone, he wasn't going to hang up anytime soon.

"Oh, o-oh fuck... Achan , you're...y-ou're gonna tear me in half! Fuck!" she tried to plead with him for some kind of mercy, but as her backside was thrown into his lap and pounded over and over again, she knew that her words wouldn't reach him. "Such a naughty beast...fucking your l-little sister this way!"

He couldn't have known if that was just her fetish, or if Adina had really given the product to her brother. In his current state, Achan didn't look enough like her for the coyote to be sure.

His jaw still dropped as he watched the phone closely, wondering about their relationship all the while.

His view was obscured slightly as juices poured down from their bodies in a slick, messy mingle, until drops splashed over the lens of the smartphone camera. Not knowing that it was running, the siblings didn't bother stopping to clean anything up.

They just made a bigger mess as Adina struggled to clench around the tip of Achan's member, hoping that she'd be able to convince him to try and knot with her once again.

There's no way it'll fit, she thought, but she didn't dare to discourage him from trying. He really will break me, and I'll love every fucking second of it.

Achan's body and libido were permanently changed, but it was Adina's mind that was going through the greatest transformation. She'd crossed a line that she knew she never should have, and now that she was on the other side, she couldn't believe how green the grass was.

Her brother was simply feeding a growing addiction as cum burst from the tip of his thick, canine member and flooded her womb, splashing around in her body with concerning virility. Excess seed splashed back out of her body as he pinned her against the wall once more, forcing her breasts to rub against the paint and her cheek to rub against a trail of her own drool; each and every sensation heightened her pleasure as she graced her brother's cock with her own climax.

She didn't need to feel his knot to know that she belonged to him...that was just her lustful, insatiable greed, and when it finally popped inside of her...she knew she'd never get enough of the beast her brother had become.