Chapter 1
Chapter Text
Hell. As the human world knew it, a place of unbridled suffering, a place where the damned were punished for their sins and devils ruled with sadism and cruelty in equal measure. It was a place shunned by all, feared by all, and offered no sympathy.
That may have been true a long time ago, but to one young devil girl, it was just her home. More specifically, this was the summer home for one Rias Gremory, an extremely beautiful girl with flowing red hair, the sister to the strongest satan, and high-class devil in her own right.
Normally, Rias was found in Japan, attending Kuoh Academy, where she'd enjoy her time as one of two great ladies of the school, along with her dearest friend Akeno Himejima. She'd ace her tests, act kindly and courteously, and when school was out, gather up the members of her peerage, her beloved devil servants, and do as devils did. Sometimes that meant fulfilling requests like help on a test, sometimes it meant putting down stray devils or fallen angels that thought to prey on humans on her turf, and sometimes it meant engaging in fierce battles with rival peerages for prestige and power.
But now, school was out. The season for rating games was over, and it was time to take a break from all the stress and strife of daily life. Rias had granted a vacation to her peerage, and retired herself back to one of the many mansions that the Gremory clan possessed.
It was perfect for her. Hell was actually very similar to earth in terms of geography, with the largest difference being a near total lack of oceans. This left vast amounts of space for a very small population of devils. In other words, Rias' nearest neighbor was more than hundred miles away, and she was free to let her hair down and relax.
After nearly a week of sprucing up this room or that and lounging around naked while she read books she hadn't had the time for during school, Rias was starting to get a little stir crazy. She should have forced one of her friends to come here with her. There were no friends to come however, which meant instead Rias would have to go out.
The Kuoh Academy uniform came back on.
"Geez, I was trying to get away from school wasn't I?" Rias muttered to herself. But for the warm summer heat, it was the best choice she had. The tiny red skirt did nothing to hide her long pale legs, all the way up to the middle of her thick and soft thighs, perfect for when a cooling breeze swept by, and the tight top that strained against her voluptuous chest was thin enough that it wouldn't force a sweat.
Fully prepared for her walk, Rias went off. The Gremory clan's territory was massive, and her brief time alive hadn't given her much of a chance to explore.
It was a beautiful day for it too. The sun shone overhead in a piercing blue sky, casting everything in sight with a vibrant light. Rias took a deep breath of the fresh air, and let a cute smile cross over her face.
She'd walked for nearly half an hour, through green, flower filled meadows and past trees whose branches swayed lightly in the breeze. Eventually, all of this and more was going to belong to her someday. Hers to own and hers to protect. Even that black splotch over there.
Rias tilted her head. "What is that anyway…" She moved along towards the mysterious black stain cautiously and then quickly as she got close enough to see it wasn't a stain at all: it was a dog!
She rushed over and slid along her knees to its side, heedless of the stains and mud, and began to check it over. It was a big animal. Big and heavy enough that it'd be able to knock her over with a friendly tackle.
However, its breathing was light and weak, and as she ran her hand along its side, all it could do was let out a pitiable bark, one that stirred Rias' tender heart. She had her suspicion on how a regular dog had landed in hell, but that was neither here nor there. What mattered is that she had a life in front of her that she could save.
From her pocket, a small chess piece emerged, a spare she'd received and kept for emergencies just like this. She pressed it against the dog's side, and with a flash of light, the chess piece vanished.
Immediately, the weak breathing of the dog began to gain strength, and it gave a stronger bark as it licked at Rias' fingers. Rias laughed lightly and pulled her hand away. "Let's get you home, and see about getting you cleaned up, alright boy? Maybe we'll get you a name too."
The dog barked again and rose to its feet. Together, the pair set off for the mansion. This had been an exciting walk for Rias, and now that she had a furry friend to spend the summer with, she was practically walking on air.
By the time they reached home, Rias had run through several names for the dog. She'd tossed out 'Dog' right away as being far too simple, and although 'Cat' may have been an extremely good name, it didn't quite fit either. Eventually, she'd asked the dog what he thought of 'Kieran,' and hadn't gotten bitten for it, so Kieran he became.
Several parts of the house quickly became a warzone as Rias struggled to drag Kieran into a bathtub to clean off his matted fur before he could rub himself on everything that he saw, and by the end of the brutal encounter, she was so filthy she'd been forced to take a shower herself!
Kieran seemed relaxed enough then. He'd patiently sat by the tub, having grown double in size from the new fluffiness of his fur, and generally not gotten in the way. While Rias would have liked for him to act like this before she had to give him a bath too, she'd accept small mercies, and only reached out a foot to bop him on the nose.
Night turned out to be a struggle as well. The moment Rias had shut her door and stripped down to nothing, Kieran had howled so terribly and sadly he might as well have been dying again, and the instant the door opened back up he'd flashed inside the room and onto the bed, his tail wagging so hard it slapped against the blankets like a drum.
Rias' tough face cracked in front of the display, and after telling Kieran 'this was a one time thing,' hopped into bed as well. Sleeping with a dog was different than sleeping alone. Although Kieran was relatively still, he was so warm that after waking up in the middle of the night and feeling like she was in a furnace, she'd had to toss away everything but a thin sheet.
Now, despite Rias' promise, one night turned into two, and then several right after that. Growing up, she'd never had much of a desire for dolls or anything like that, but having Kieran in bed was different. He was warm, friendly and just a real friendly pooch. The only downside of taking Kieran to bed was that Rias' alone time dropped to zero, but she'd manage for such a cute big guy.
But one night, Rias' dreams turned wet. She wasn't sure who she was with, their name didn't matter really, all that mattered is how they made her feel. He kissed her deeply, their tongues twining together as they let themselves get consumed by lust.
Rias draped her hands over his back, holding on tightly to his muscled, defined form, and he replied in kind. Rias gasped, cheeks flushed red as his hands grabbed one of her boobs and gently massaged it, lightly squeezing and groping her before sliding his fingers to give a small tug on one of the perfect pink nubs that capped them.
Rias whimpered in response and whispered for him to do more. Her thick thighs parted, revealing her already wet pussy. It was an open invitation to fully explore her body, and the man took it.
He kissed across Rias' neck and down the curves of her body before finding himself right in front of Rias' folds. He leaned forward, and brought his tongue down from the bottom of her pussy up to her clit in one smooth lick.
Rias moaned, and her legs unconsciously squeezed together from the pleasure, squeezed together around something… furry?
Another lick, faster this time, across her pussy, and Rias looked down to see not the man she expected, but Kieran the dog taking another tentative lick of her pussy. She looked around her room, saw that it was her room, that this wasn't a dream anymore at all- but before she could let out any sound, Kieran lost all hesitation and the only thing Rias could do was let out a vulgar, lewd moan filled with confusion, shame and pleasure.
Kieran's tongue immediately lapped away at Rias' cunt, his long dog tongue pushing in forcefully as he tricked to lick more of the sweet juices that Rias was releasing. He nuzzled deeper, his furry head tickling Rias' inner thighs as his floppy ears twitched against them, and in response to hearing Rias' repeating moans and squeaks.
His nose continually bumped up against Rias' clit and puffs of hot air brushed across it as he sniffed away at her. He'd woken up in the night because of that smell, the smell of a total bitch in heat that needed to be satisfied. That it was Rias was all the same to Kieran. His instincts told him what she needed, and what he needed to do to her too.
Rias' fingers clawed into her bed sheets and her legs fruitlessly tried to close together, but Kieran was too strong, too insistent for her to stop him. And it feel too good for her to try either. Rias breath hitched when one stroke of Kieran's tongue pushed its way into her folds, and stayed there, his tongue digging deeper and deeper and sending sparks shooting through her body.
It felt so good Rias started losing herself into it. Her hands reached to grope at her own tits, molesting them far more forcefully than her dream lover had. Her boobs were too big to grab at once, and they spilled between her fingers as she played with herself, squeezing in tandem with the feeling of Kieran's tongue driving against her walls that clenched and squirmed around it.
Her eyes glazed over, her head emptying of any thoughts at all, just a burning lust that threatened to consume her entirely. Her pale skin grew shiny as a thin layer of sweat built up on it, and her body got hotter and hotter as she focused more on the feeling and less on her shame.
"Mmmm, go deeper Kieran!"
Rias' hands slapped to her mouth in shock. She couldn't have just said that, she couldn't have wanted a dog to eat her out, right? She was the heir of the Gremory clan, she wasn't a dirty slut that tried to chase whatever climax and pleasure could come her way, was she?
It didn't matter to Kieran. He barked an affirmative, and began licking her pussy even more eagerly. A heated groan slipped through Rias' fingers and her legs grew weak, all her strength drained by the beast between her legs.
And then she saw it. Kieran was a hot blooded animal and he was devouring the pussy of the sexiest woman in hell. He couldn't, and wouldn't stay calm. And slowly, a red rod started to push its way into the open, growing thicker, and wider the more he licked. Rias' eyes grew wide as she watched, unable to tear her eyes away from the fattest, thickest cock she'd ever seen in her life, bright red and already trailing a thin liquid from the tip.
Her mind raced, but it raced in only one direction: of how something like that would ruin her. Kieran would mount her like a bitch and ruin her cunt for anything but his doggy dick. She hadn't worn clothes for summer, but if he fucked her with that, the reason would be so she could get on her hands and knees for Kieran whenever he wanted.
Lurid images and fantasies, each one more depraved than the last, flashed through Rias' mind over and over. Her mouth slowly twisted into a circle, and she let out another moan. The spring in her gut snapped and her mind crashed with white as an orgasm swept through her, her whole body shivering from the sheer bliss.
Kieran vaguely understood his success, but didn't care much to stop, and continued to eat out Rias all the way through her climax, nearly forcing another one on her before she was able to recover, and leaving her trembling and sweating on her bed.
"M-Kieran!" Rias eventually managed to cry out, calling the dog away from her cunt, and to her face. The tongue that had just been buried inside her instead licked across her face several times, and then shocking herself, Rias parted her lips, and kissed the dog back.
Her tongue pressed against his for a moment before his overpowered hers and began to explore her mouth. Rias' eyes widened, before she carried on with the kiss, making out with the dog even more passionately than she had with her dream lover.
Eventually, Rias pushed Kieran away, and he willingly went, sitting down, and exposing his massive dick once again. Rias' face flushed just looking at it, her pussy wetter than ever. But her mind struggled with what it was thinking.
Was she really going to keep going? Wouldn't it be better for her to just call this a slip of the mind, to send Kieran away, and not think about his tongue, or his cock, or anything else? It would be better, smarter even to do that. This had been a total mistake, and absolutely not appropriate for the Heir of Gremory.
But, another darker part of her mind whispered, did she really think it was a mistake? Rias was stronger than Kieran, a high class devil wouldn't lose to a dog ever. Only, she had barely tried to push him away. Instead, she'd been more than happy to let Kieran pleasure her. Wasn't she really just a high-class whore that wanted dog cock to get crammed into her holes? Rias had known all along what'd happen if she didn't put a stop to it right away, and she let it happen. So why stop now?
She could lean between Kieran's legs right now and return the favor. Stretch her plush lips around his thick red rod, choke and gag as he humped her face and forced her to take him down her throat, she'd try and pull away but his paws would press down on her head and make her blow him like the slut she was until he dumped his cum into her mouth and left her glassy eyed and drooling on her bed, and while she was-
Kieran barked impatiently, fully aware of how much Rias wanted his cock, and tired of waiting for her to realize it herself. That snapped Rias out of her funk, her pussy clenching when she understood what he wanted, and how excited that made her.
But still…
"Let me pay you back first Kieran~," Rias said coyly, while Kieran cocked his head. Rias slid down until she was flat on the bed, then dragged Kieran towards her until his hind legs were straddling her stomach.
And his cock was slapping in between her fat, perfect tits. Rias shivered as she felt the scalding heat coming off Kieran's dick and how it twitched and jerked eagerly with every beat of his heart. It really was an understatement to call Kieran's cock big. It was just absolutely massive, and even her boobs, ones Rias was rather proud to call large, wouldn't be able to cover it. But that was almost better.
Looking up at Kieran's furry chest, Rias grabbed hold of her tits and pushed them together, as if trapping Kieran's thick cock between them. But it was hardly a trap for Kieran, who barked excitedly, and instinctually began to fuck Rias' tits, rapidly humping away at them.
The red tip of his dick quickly pushed through the dense valley of titflesh, and soon enough was dragging back and forth along Rias' lips, dirtying them with its thick scent and taste. At first, Rias tried to let it be, but as it continued to tease her, and as her earlier fantasies crawled back into her head, she couldn't hold herself back.
Her tongue reached out to meet the tip, and then began drawing it towards her wet, warm, and willing mouth. Kieran barked happily as he felt Rias lick and suck whatever she could reach when he thrusted forward, and he did so even more energetically, his heavy balls slapping against the underside of Rias' boobs and making them jiggle with every impact.
Rias knew she'd finally dropped the last bit of resistance she had away, and she couldn't be happier. There was no longer any embarrassment or skittishness to her actions, and instead she pumped her tits along Kieran's length, letting him feel even more and even faster, all the while her tongue swirled around his crown, memorizing the taste and the feeling of his cock in her mouth.
Kieran for his part was more than happy to enjoy the results of Rias giving in to her inner slut, and he continued to enjoy the unique pleasure of getting a titfuck and a blow job from one of the most powerful and important women in Hell. And maybe the biggest slut in hell too.
His pace grew more fenetic, his paws lifting off the ground and different times as he fucked Rias' tits, occasionally coming down and accidentally stepping on her, or lightly scratching her with his claws. Even if this wasn't a pussy, Kieran was still going to fuck it with all his might.
Rias didn't mind. Even if it was a dog, it made her feel sexy and hot to see how much Kieran wanted her and her body. Maybe even more so, that even an animal knew how good she was. There was a solid chance Kieran didn't think of her as his master or even just Rias at the moment, so much as a fuck-toy for his pleasure- all because of her.
She pushed together her boobs more tightly, and Kieran continued to power through them, her mouth continued its slavish devotion to his cock, and Rias' cunt grew wetter and wetter as she felt Kieran's muscles tense and tighten.
Thick beads of pre-cum that stained Rias' tongue drooled out of Kieran's cock, the heavy taste nearly making Rias squirt all over her bed. Kieran was approaching his limit. His heavy balls were churning with cum to mark his bitch, swelling and readying themselves to make sure everyone in hell knew who Rias belonged to.
But Rias had made a decision. There was no denying now that she was a total slut for doggy dick, certainly, but if she was going to make Kieran cum, he was going to do it in just one spot: deep inside her cunt.
If Kieran had pushed harder, he might have been able to push into Rias' throat, and if that happened, Rias would have accepted it gladly. She'd finger bang her pussy even harder than Kieran could hump her face, and she'd memorize every inch of his cock as he did it, even as he slapped his balls on her cheeks.
Instead, with the force of will of a slut that needed to get fucked, Rias pushed Kieran away, even as he barked in anger and confusion that his bitch was denying him want he wanted. However, he was immediately mollified when Rias rolled over onto her stomach and raised her fat, fuckable ass into the air.
She shook it it back and forth like a bitch in heat, begging with her body that Kieran would mount, and then fuck her as hard as he could. Hard enough that he broke in her cunt for his doggie dick for the rest of her life. Hard enough that she lost her mind entirely.
Rias didn't even have the capacity to act coy anymore. "Come on Kieran~! Isn't this what you wanted all along," she said with a husky voice full of lust, flipping her red locks to the side. "You were never worried about being alone were you? You just wanted to get closer to me. I bet if I didn't start touching myself I still would have woken up to you driving your fat dick in and out of my pure little pussy. Well now I'm waiting for it. I'm waiting for you to finally be the big bad wolf and Oh!"
Kieran didn't understand the words coming out of Rias, but he did get the tone. She was begging for it, for him, and now nothing would stop him from screwing her brains out. He moved behind Rias and briefly balanced on his hind legs before falling heavily on Rias' back, forcing her to shoulder most of his weight.
His front paws managed to hook around her wide hips, and his nails nicked at her skin, leaving small red marks along the smooth white of her thighs. Kieran didn't care about that. His hips pumped frantically, so much so that the first two thrusts missed, instead grinding along the outer lips of Rias' pussy.
Then on the third, he drove home in an instant. The entirety of Kieran' cock sheathed itself in the pliable, wet folds of Rias' cunt. But Kieran didn't stop, he didn't even slow down. Immediately he pulled back, then ruthlessly jackhammered his dick back inside Rias, over and over, stretching her out to take him even better.
Rias' arms gave out the moment Kieran started ravaging her pussy, her face slamming into a pillow, trapping her moan and her tits flattening against the bed. It felt so good. Better than any human man she could have possibly had as a lover. None of them would have had Kieran's speed, or his strength, or his huge cock that he pistoned out of her cunt without mercy.
The walls of her soaking pussy tried to clench and clamp and squeeze down, they tried to drive the invader out, but the efforts were futile. No matter how tight her pussy got, Kieran fucked straight into them, driving his cock deeper and deeper.
With what little brainpower Rias had left, she realized Kieran really was going to break her in and turn her into his own personal breeding bitch. She was supposed to be the King, the head of her peerage, but that seemed so pointless now. Her real role was to be Kieran's slut, and to help him cum whenever he wanted.
The very thought tore through Rias like a bolt of lightning. The sheer degeneracy of it, the surge of arousal and shame it caused made her cunt clamp down like a vice on Kieran's cock, and it combined with the unreal pleasure of getting powerfucked that Rias couldn't hold it in.
Rias came from getting screwed by an animal. Her eyes rolled back in her head as she got fucked stupid and she let out a moan so loud if anyone else was in this mansion they'd know right away that some whore was getting the fucking of their life. Her cunt tightened and retightened, pulsing as it tried to milk Kieran's cum from his balls. Juices burst from her pussy, spilling all over her thighs and down onto the bed.
And Kieran didn't stop. His furry, shaggy chest rested heavily on her back, but his head tilted back to let out a loud howl of victory as he dominated the submissive devil slut cumming all over his cock. His hips moved even faster, blurring as he thrust his dick into Rias' pussy again and again, delighting in how she was molding herself into his shape.
He was utterly relentless in how thoroughly he fucked her. He was practically fucking her hard enough to break the bed they were in, pushing her down into the mattress with every thrust, making her fat ass ripple with the force of the impacts. His fat, heavy sack, swollen with cum slapped against Rias' outer folds every time he pumped inside her, giving her a constant reminder even in her fucked stupid state of what was yet to come.
Rias was in a constant state of climax. She didn't have time to come down from one orgasm before the next one swept through her, her whole mind going blank except for pleasure, unable to even count the thrusts of Kieran's cock into her, each one forcing another blissful moan from her.
All she had were sensations. She could feel her heart pounding in her chest and could feel the deep beat of Kieran's in his as he pressed against her back. She could hear the heavy panting from Kieran right next to her ear, and felt his warm tongue lick along it, a tickle that just barely registered over her guts being gouged out.
Rias' head slowly lolled to the side so that she could press her lips against Kieran's muzzle and give him a kiss, and he responded in kind, their tongue pressing against each other in a sloppy make out while Rias' pussy became a sloppy mess.
And then Rias felt something that finally managed to break her out of her fugue state. Something round and bulbous was battering against the entrance to her pussy, trying to force its way inside.
Rias' tilted her head down, and her eyes widened when she saw the thick red knot at the base of Kieran's cock. There was no way that was going to fit into her pussy, no matter how hard Kieran tried, and the sight of it made Rias try to crawl away.
But Kieran's determination was too great. His paws dragged Rias back and he continued to pump his hips, grinding the massive knot against Rias' again and again, refusing to give up. And then Rias squealed as her pussy started to give way, slowly spreading more and more, letting Kieran get closer and closer to his goal.
Was it Kieran's efforts that allowed this? Was it his brute force approach and desire to seed his bitch as deeply as possible, to seal his cum inside her?
Or was it Rias? Was she really just that much of a slut, that desperate to get fucked, that addicted to doggy dick that her pussy was able to stretch beyond its limits, all to get filled with a thick load of cum?
It didn't matter either way.
One thrust more and Kieran's knot popped into Rias' cunt, locking them together. The powerful full thrusts that sent every inch of Kieran's length in and out of Rias' and shook the bed immediately transitioned into quick pumps, crushing her insides to make space.
Rias grinded back against Kieran, wanting, needing him to finish inside her, to prove that she really was his bitch. "Come on Kieran. Do it! Cum in me, do it, do it, do it!"
Rias was begging for it. Kieran, driven to the brink by the tightness of Rias and the endless doggystyle pounding he'd given her, obliged. He howled again, his sack pulled up tight to his hindquarters, and his cock seemed to expand, making Rias even tighter.
Then thick, heavy ropes of dog cum blasted from his cock. In a single spurt Rias' pussy was totally filled with Kieran's seed, and she moaned as she felt the liquid heat bloom inside her, painting every inch of her folds white.
But one was not nearly enough to empty Kieran's balls, and he continued to cum, forcing more and more cum into Rias, his hips jerking as he tried to force every single drop inside her. Rias' felt like her belly was swelling from the sheer amount, with none of it able to escape the tight seal made by Kieran's knot.
Her eyes rolled back until they were showing nothing but whites as she came again, harder than she had throughout the entire fuck session. Her pussy pulsed in tandem with the twitches of Kieran's cock, drawing out more and more of his cum, until the pressure built up so much that the white fluid started leaking out of her totally stuffed cunt.
For several minutes, they stayed like that, locked together as a king and his bitch. Until finally, mercifully, Kieran's knot slowly deflated and he was able to slowly draw himself out of Rias.
Rias groaned softly as Kieran's dick scraped gently along the overstimulated walls of her pussy. The moment he was fully removed, her legs collapsed to the side, trembling. She'd only been able to stay upright from Kieran supporting her, and now that he was gone, she was too exhausted to stand. Thick cum began to drool from her stuffed, despoiled cunt, staining her sheets irreparably with Kieran's scent.
Rias could hardly move at all, but that was fine. Basking in the afterglow of what she'd just been through was all she wanted. No thoughts about what she'd do later, or that she'd fucked a dog, or that she'd love it so much. Just warmth and relaxation.
Kieran rested his furry form around Rias' side protectively, partially enveloping her with his comforting presence, and he gently licked along Rias's shoulder. Rias reached back and lightly scratched his head.
"Good boy, Kieran." Rias said, setting her head against his side. "Good boy…"
Rias's eyes slowly started to flutter shut, and her breathing started to deepen. Kieran stayed awake for a little while longer, before he rested his head down on the bed as well, and shut his eyes. Sleep came quickly to the weary, worn-out lovers.
The next day, Kieran woke up alone in bed. His head perked up in alarm and he began to sniff around for where Rias might have run off it.
He leapt off the bed, and began navigating his way around the house, nose close to the ground as he stayed on the hunt.
Fortunately, he didn't have to search very long at all to find Rias. She was laying nude on the couch, soaking in some rays of sun. Kieran wasn't enough of a critic to appreciate what he was seeing, but he still barked excitedly when he saw her, and quickly trotted in her direction.
Rias sat up and smiled when she saw Kieran start to approach. She scooted forward toward the edge of the couch, and spread her legs widely, showing off her already wet petals. "Kieran~..."
Underneath Kieran, a thick red piece of meat started to grow again, and Rias's smile turned wicked and slutty. Summer had just begun as far as she was concerned, and she intended to enjoy every minute of it.
Though, it might be nice to have Akeno over to visit too. Kieran would definitely appreciate it.