A/N: real kinky shit happens.

The collar Ren Yamashita ordered was for obedience training. Discipline. She'd call Yuuki in the privacy of her home, put it on him there, and using its special properties, show who was on top in the women-dominated hierarchy of the Antidemon Corps. Until, while inspecting it, accidentally slipped it on. She couldn't even touch the collar due to its properties, fingers trembling just a few inches away from the strap that cursed her into this spot.

"S… Similar to Kyouka's ability, this was to reward me and punish you. And now this happened."

The two of them were alone, sitting down at a table with open walls to her garden and whatnot. No one was going to find or disturb them.

"I'm sorry…!"

I might actually kill the seller I got this from when this is over, thought the black-haired girl.

They were in the living room. Amenities received from Amazon were subtly placed next to them, in cabinets or atop shelves: a dog bowl labeled 'Pet,' a leather leash, wearable dog ears, and buttplug dog tail. There wasn't a command to retrieve the pegging dildo she planned to use on him, though there wasn't a point now. Her foolproof plan was too foolproof on one side. Those were for him, not her! And now she was going to use them. She stood up - not because she wanted to - and walked directly to grab the accessories.

"The master is the closest person to the wearer, and the victim's body and mind is in their control."

She adorned the brown dog ears and stared at him, ice-cold. It tarnished her dignified look and red ribbon. Her body wasn't going to stop, because domination loss was the purpose of the collar's control.

"You can't command me to take it off until thirty minutes pass," her violet eyes narrowed at the fact, cringing at what could occur in the half hour.

"I programmed a few commands into it beforehand, to ensure things would go smoothly once it was on you."

Luckily, her dogs weren't there to see her place the dog bowl down and pour some biscuits in it. They were for human consumption, but resembled dog treats. This command complete, she moved on to taking the tail and leash out a cabinet to put on the table. Accompanying the sex toy was a bottle of lube.

"It was to show who's the dog and who's the master between us," she spoke, her body and mind were two different entities at this point - her face disgruntled, but her movements swift without pause.

Yuuki watched in awe as she unbuttoned her formal jacket, skirt, and cape just like back then when testing out his Killer Fang transformation. Only this time, she took off her pantyhose, bra, and underwear too. Everything was in view, from her cleanly shaven vagina to her average-sized bust. Redness seeped into her angry expression, more embarrassment than rage.

"So I made the collar force its wearer to act like a dog."

Naked, she went on all fours in front of him mimicking the stance of a canine. He was her handler now, and no order like taking off the collar would work at this stage. Her defenseless, lithe figure could feel the cool breeze over her pristine skin as she slowed to a crawl.

"What do I do?"

"As much as I hate it, you can do anything."

Wordlessly, he examined the buttplug and lube in his hand and bowl a few feet away. Ren had to be his dog to fulfill the demands of collar, so he was going to continue the act. How far was she going to go with him? The commands would've made him do the same. He'd be naked, letting her see his cock on full display and more. He stared at her for a few seconds, seeing the perfection of her skin and proportions of her adult figure.

"… Stay."

She didn't move an inch. He walked behind her, but she wasn't allowed to turn her head. Senses guided her. Feeling his breath on her ass, she yelped when she grabbed it and spread it open. Her asshole was in full display, as was her female anatomy.

"J-Just know, you are a beast…!"

This man is a beast. Like all men, he's-

"Ah?!"

The leader stuttered as one finger, wet with the silicone lube, spread it across her outer and inner rim, the erotic sensation making her arms and legs tremble. Glossy, and he didn't hesitate to massage more of her butthole, feeling her muscles clench on his digit. Then came another one, that come-hither motion pushing out tiny moans Ren bit her lips on.

"Look at me."

His face was conflicted, but he tried to be serious. The subtlety of his fully clothed body compared to her bare one felt like the dominance was shifting outside her favor.

"Do you want this?"

"Whatever! Do what y-you want!"

"Y-Yes ma'am!"

Holding the doggy tail, he nervously pushed it deep in her. Now her knees buckled, losing composure at the foreign rubber object's stiffness wedge itself. Pleasure was the goal, and she felt it.

"… You're a dog, so, sit." He announced.

If I sit, it'll…..!

Her body moved on its own to kneel. Her hands and feet acting like paws, the latter doing its best to mimic the lowly animal. The toy was really inside her sphincter now, and the furry brown tail was positioned perfectly outside, making her yelp a shameless moan. Ren could feel herself blanking out. She was being subjected to this…. This, of all things! Beads of sweet overwhelmed her face. Vairocana was useless.

She yelled.

I'm not a dog!

"Woof!"

It was cute and high-pitched, like a poor attempt to roleplay as a mutt. She didn't want to say that!

"W-Woof…?!"

Oh no.

"G.…. Good girl?"

Don't call me that!

She wanted to scream, but he patted her head, closing the distance between their heads. Instinct made her lean in and start licking his face. She couldn't say a word, she just kept slobbering him, and the violets in her eyes flared in arousing spite.

The headpats continued alongside this. Running through her hair was like a black, silky waterfall, movements that soon started to take a toll on her head too. Addictive was the word. His rough hand felt so gentle. She could feel her red ribbon go undone, fall to the floor, but something about being rubbed just broke her. One of her legs got jittery, bouncing up and down from the stimulation in glee. Her licks slowed, her face was evidently flushed, and she saw nothing, thought nothing but his flawless complexion as he caressed her.

It's not supposed to feel this g-goooddd…

A bitch in heat. That's what she was. Eventually, he stopped. Still sitting, she just looked at him. Her eyes weren't as glaring, but she was still Ren. She wasn't a dog who deserved this lowliness.

Yuuki's reluctance set in. How far could he go? As soon as that collar was off, he was going to be in serious trouble from her. He proposed a solution.

"If….. If I commanded you to be unaware to forget this, would it help?"

It'd be less humiliating.

She wouldn't remember the next thirty minutes. Not that she'd want to think or remember this. Knowing this, she nodded, unaware herself of what was to come.

Fine. Do it.

"Woof."

"I-I command you to be a dog, forgetting everything until the collar's off."

Here we go. I swear….. I swear I'll show you who the real dog is.

She wanted to finish that thought, but her head felt like it was going through an immense headache. She held a hand to her face, blinking several times in confusion as the sensation overwhelmed her.

Be…. Because….

Her vision began to disorient. Growing absent-minded, her mouth hung open and drooled. Her eyes started to roll, losing focus. In fact, the chief couldn't focus on anything besides the man in front of her, fixated on his comforting eyes. It soothed Ren's heart, uplifted her body, to be so… so lightweight.

I-It's…. it's….

She went limp. Her worldview shrunk - extremely.

"Ren?!"

Her fallen body rose. A certain dullness manifested in those once assertive eyes. One second later, the dog girl sprang to life and pounced him.

"Woof!"

Apparently forgetting meant losing control, becoming wholly instinctual. Her brain turned off, with it any hesitation. The hypnotized headspace of a dumb, submissive puppy replaced any humanity, because why would dogs be superior to their owners?

Ren is dog. Ren loves master!

If anyone saw them, they'd see the apex demon slayer panting, drooling, feral love in her eyes over her master. And salivate she does, her tongue was casually out as she panted. On top of him, the dog took to nuzzling his chest. Her naked body cuddled him without worry, without regret, but with utmost love. Dogs unquestionably, unequivocally obeyed their masters! Submissive love painted her purple eyes a melting jasmine, and her flowery perfume wafted in the boy's nose.

"W-Wait! Up! Up!"

She listened. Being upright, her leaking pussy juice finally crept down her thigh. The complete turn in personality showed in how that didn't bother her. The dog simply tilted her head in curiosity as Yuuki saw the fluid trail down to his pants. Sexual desire and confusion were equally thick in the air. He really could do whatever he wanted.

I really am in control.

"Lay."

Regaining dominance, the boytoy slave-turned-master watched her roll over, exposing her midriff and moderate cleavage. Animalistic fueled his hands grab her waist by the sides, rising up until reaching her chest, then shifting back down to rub her bully. Ren, or 'Pet' as written on her collar, was steaming. The circular motions of his hands elated her simple mind, further losing any semblance of humanity as the fondling warmed her nether regions further.

Can I do this, too?

Yuuki grabbed the leather leash and attached it to her metal ring. Tugging, Ren resumed the canine stance and had on a blissfully, primitive smile. He walked her to the dog bowl and pointed at the food within it. The leader retained enough intellect to know she was being pampered more, and which was why she loved master.

The 10th unit's chief, commander of the Antidemon Corps, undefeated in combat, was leashed in a dog cosplay and bending her neck down to eat biscuits off a pet bowl.

Messy chomps called for crumbs to spill, but formality had no meaning to someone who was commanded to 'act like a dog.' Her tiny world only knew happy stimuli and sad stimuli. Having known only the former with her master, Ren ate without a care in the world, because she had someone to care for her needs.

The bowl was empty, and it was time for a walk. She showed this by moving her head toward the garden, and Yuuki obliged. He thought that wouldn't hurt. Crawling on all fours, the Japanese girl was beside him as she pranced around, admiring her low perspective. The fake tail wagged along, adding its own bits of joy.

Her lowest low, as Ren would come to find, was when she was next to an appealing bush. Yuuki didn't stop her in time from raising a knee up and she started peeing. The stream, so utterly degenerate, so uncivilized, felt like minutes to both parties. Her muscles twitched, and her mouth panted until completion.

The short walk left a long, burning image of Ren in Yuuki's mind. The ride didn't end. Back at the same table, he sat down on the tatami mat. Ren went down to his crotch and poked her nose into it, sniffing his masculine heat.

S-She's…

A whimper escaped from below. The master-turned-slave had been horny since start, and this merely translated to the experience of being in heat. Her mind bordered on being blank and being greedy. She was obsessed with the scent emanating from his underwear, his burning cock, and wanted to see it.

"Do you," the twink gulped, "want to see it that badly?"

"Woof."

His own insatiable lust caught up to him. Her naked figure turned him on, as did his flawless figure turned her on. He took off his own pants, shed him free of his underwear, and let his meat out on her forehead. His tip was uncircumcised. Pre-cum mixed with her black strands, and the dog responded by unshackling her instinctive urges to breed.

She nuzzled her hand up and down his tall shaft, letting the dirty stench of her cock sully her silkiness. Nibbling his balls, the slave opened her mouth, letting her tongue slither out onto his veiny shaft. Still on four legs, the sweat-stained, careless dog kissed his foreskin and went down, peeling it away as the delicious head within filled her red-hot mouth. In utter worship of her master and his rod, her petite head bounced up and down his yummy cock. This was his reward, and she was a good girl. Ren relished the meaty, salty taste as more and more pre-cum mixed with her steamy saliva.

"Woof~!"

This was too much for the boy. They lost their virginities together as he grabbed her head, slammed it down his pubic hair, and let out the biggest load inside. Immediately, he pulled his penis out to flood not only her mouth, but also her face. Bathing in post-sex ecstasy, cum coated on her delicate face. Panting, tongue out, hearts in her eyes and his eyes locked in this minutes-long endeavor. She nibbled on his left ear and rested below him. This was the remnants of her feminine, apex superiority, reduced to temporary life as a fucktoy.

For protection, her manor has surveillance cameras everywhere. She knows every single one's placement, including cameras in the living room.

So there she was masturbating to her own humiliation, aware of everything that transpired due to burning curiosity. To watch her be so degrading, so feral… even in public, the thought of servitude made her pantyhose slick down there. She hated the fact that she was his plaything. But, in the privacy of her home where no one could hear her, she let out a murmur:

"I want to be your dog again."

A/N: cats are actually better than dogs