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2025-06-27
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i'm the only one who love your sins

Summary:

Rumi and Jinu fuck somewhere backstage at the Idol Awards, after she finds out that he betrayed her.

Notes:

there's not enough demon smut fics going around recently so i decided to indulge myself.

i haven't really written a fic in a long time so i might be a little rusty in my descriptions. oh wells. also i never ever proofread my work because i'm lazy so just ignore anything you might see that does not look right ok.

yes i edited the title to match my other two fics so now everything's just song lyrics.

(See the end of the work for more notes.)

Work Text:

Feel. 

That’s all demons do. 

That’s what Jinu had said the first time she had snuck out to meet him. 

Rumi had slowly allowed herself to accept it. Demons are cursed to be controlled by Gwi-Ma. He uses their shame and guilt against them, dooming them to an eternal life of pain. It’s easy to just accept it as rhetoric.

But to live it? 

Rumi clutches the thin fabric of her crop top, right above where her heart is racing, beating so fast she can barely breathe to keep up, so hard her body feels like it would fall apart. She feels all of it— shame, guilt, despair, misery— and so much more than she ever has before. It feels like her whole life of shame is nothing compared to this very moment, with all of it engulfing her entire being. Her shame is consuming her, owning her, tethering her very existence to itself. 

She gets it now— why Jinu had decided to throw it all away, why he’s done with 400 years of endless anguish. She can barely live with herself, even in these short minutes where she could feel the patterns burning through her skin, her fingers narrowing to sharpened claws and canines protruding to narrow fangs. She still does not hear Gwi-Ma the way Jinu claims he does. Perhaps she’s lucky. Perhaps that’s just another one of his lies. 

She doesn’t want to believe it was a lie. 

She wants to believe that even now, even as he holds his hand out to her, enticing her to his side, he’s doing it under the pressure of Gwi-Ma’s voices. 

“This is not you,” she keeps repeating. 

This is not me.

“This is me.” Jinu’s hand drops. “This is you. This is us .”

Demons. 

That’s what they are. 

Even if they used to be humans. 

“No.” Her voice breaks, shakes as she sobs. “No, this is not me.”

“Look at me. Look at yourself!” Jinu hisses, grabbing onto her wrists and pulling her towards him. She does. She looks up at him, at his face, that used to be so pretty and is now scrawled with glowing purple marks, gleaming golden eyes shining menacingly through his pain. His face used to be so pretty. So so pretty. She had liked it on sight. 

Used to? 

Had?

She continues to stare up at him. 

No.  

“Even now, you’re still so pretty,” she whispers, her voice broken. 

Jinu’s eyes go wide, his hold on her weakening. And when he speaks, his voice is shaky.. “What?” 

One word. Just one word. Yet, it carries all the years of self-loathing he harbored within himself. All 400 years of it. 

“I just… I…” Rumi shakes her head, not really knowing what she’s trying to say or convey to him. 

“This is not pretty. This is…” He drops her hands, only to stare at his palm. “This is all we can be, Rumi. The sooner you get it, the better.” 

“No.” Rumi shakes her head. “No, this is not. We can still fix this. Help me fix this. You promised. You promised !” 

A red pulse accompanies her scream, reverberating in the air around them, surging through the Honmoon that continues to split at its seams. The two of them stumble a little, but still catching their footing, staring at each other in heavy silence. 

“Fine. If you refuse to admit it,” Jinu says, his body straightening out. “I’ll make you.” 

Rumi goes still, not sure what she was expecting, but definitely not for Jinu to grab her by the arms and pull her towards him. She’s so close to him now, enough that she can feel him, even when their bodies are not actually touching yet. His golden eyes bore into her and she shudders. 

“You have ten seconds to pull away,” he whispers, his voice gruff, demonic even. His grip weakens around her arm, only to prove his point. 

She should. 

She really should. 

He had betrayed her and made his decision to stay on Gwi-Ma’s side. Broken her trust. Shattered her hope. 

And yet, she doesn’t step away. 

Instead she reaches out, grabs him by the collar and pulls him closer to her. 

He’s going to make her? What a joke. She’ll make him see her side. 

When their lips meet, Jinu goes stiff against her, though only for mere moments before he kisses her back. There’s no innocence and chastity in the kiss, no holding back, no awkward touches and stammering among blushing cheeks as she would have expected her first kiss with Jinu to go merely a few hours ago. She kisses him as roughly as she can given her limited experience and he gives it back in tenfolds, mouths open, lips sliding against each other, their fangs and teeth clashing as their tongues dance in a desperate rhythm. Jinu pushes against her and she stumbles, till her back hits the wall and she feels herself squeezed almost to suffocation. 

“Fuck,” Jinu curses, breaking away from her. “You asked for this.”

“Hurry up,” she snaps back  and he wastes no time before he kisses her again. A clawed hand finds its way to her hair, threading through her messed-up braid. She feels his grip and the strength in his hold, the sting of pressure against her scalp making her throw her head back in a guttural moan as Jinu’s lips fall to the side of her jaw and down her neck, sharp teeth grazing the skin.

She feels the fabric of her pants being tugged down, just enough for him to slide his free hand between her thighs. His long fingers move deftly against her folds in quick, harsh strokes, yet gentle enough not to hurt her with his claws. 

“You’re so fucking wet for me,” he growls, just like an animal, a predator even, tugging on her ear with his teeth. He bites down, enough to break the skin, tongue lapping at the droplets of blood that oozes out. Rumi squeezes her eyes, surprised to find her body relishing the pain rather than shuddering from it, as she holds on tightly to his clothed chest, fingers closed around the fabric. 

Jinu’s fingers slip into her, two at a time, and she cries out from the stretch., hips surging forward. She hears a rip as she pulls onto his shirt, but Jinu pays no mind to it as he starts to pump his fingers deep into her. He’s gentle enough to use the pad of his fingers even in the roughness, keeping his sharp nails from hurting her. He finds her weak spot easily, rubbing it hard. His thumb is on her clit now rubbing circles in a matching rhythm. 

She feels the pleasure build up in her as she starts to rock her hips against his hand. She claws against his chest, sharp nails and fingers digging onto the hard muscle as she tries to keep ahold of anything at all to keep herself grounded, even if it’s far too tough with the way he continues to pepper kisses and bites along her jaw, leaving bruises and marks while licking up the blood he draws hungrily. 

It’s too much. 

Yet still not enough. 

She comes hard on his fingers, body trembling as he pulls them out of her. She slouches against the wall, forcing her legs to remain upright as she opens her eyes. He’s before her, his tall body leaning over hers. Her eyes linger on his chest, shirt ripped and unveiling his pale skin, which are painted with red streaks from how hard she had grabbed at him. She watches as he brings his fingers to his lips, as his tongue sticks out from between them and slowly licks along each finger. He’s putting on a show for her, making her watch him lick the juices that were coating his fingers, ensuring to end it all with an elaborate lick of his lips, like a starved beast that had been sated by a delicious meal. 

“J-Jinu.” Her voice is weak as she calls his name, but his response is merely to press both hands on her shoulders. Still weak at her knees, Rumi feels them buckle as her body caves and submits to his push. 

She’s on her knees, before him, trapped between his larger body and the harsh wall, eye levelled with his crotch and the growing tent in her pants. She looks up and Jinu smirks, his golden eyes shining in the dim light around them. 

“Your turn,” he says. His voice almost sounds sweet, but she sees the menacing hunger and lust in his eyes. 

She narrows her eyes at him. “Fine.” 

If he keeps pissing her off like this, she’s going to bite it off. 

She palms his crotch, feeling how hard and stiff he feels underneath, before quickly undoing his belt and pants, gently pulling the zipper down to expose his boxers. They’re black, as well, just like his pants, and when she reaches to stroke it, she can feel the dampness of the fabric. 

“You can take your time, baby, but don’t blame me if someone comes in here and catches us. It would be quite a scandal if they see the leader of Huntr/x on her knees for her hoobae , don’t you think?” he chuckles.

She stares at him. “I’m not your baby.” 

Not now. Not yet, at least.

“Suit yourself,” he says, shrugging. His hand falls to the back of her head, urging her face forward, closer to him. She can almost smell his need from this distance. “Get on with it.” 

He’s right. She should make this quick. 

She pulls his boxers down. He is bigger than she thought he would be, both in length and in girth. She closes a hand around it to give him a couple of strokes. Pre-cum glisten along the reddening skin, especially around his glistening tip. She circles her thumb around it once, before letting it rub across. Jinu lets out a grunt, his hips jerking forward a little. His hand fists her hair, pushing her head closer again. 

Rumi feels her heart race. She has never done this before and in all honesty, this is the last thing she would have expected when she had kissed him. She really had thought to stop at a kiss, or perhaps a heated makeout session. But she’s far too into it to stop now. She’s sure he would, if she really wanted to. She doesn’t think his demonic degradation stooped that low. But right now, all she wants is to see just how far he’s going to go with her. 

She sticks her tongue out first, running it along the underside of his cock, from its base all the way to its tip, where she circles it the same way she did with her thumb. He tastes thick and heavy, of salt and sweat, of need and desire and she realizes that she craves even more of it. She gives a few more licks to his tip, letting herself get used to his taste. 

“Open wide.” His hands fall to her jaw, pulling forward, sharp nails against the underside of her face, angling it so she has a good look at his face that leans over her. She opens her mouth, but makes sure to keep the glare in her eyes as he pushes himself into her with a hiss. His movement is slow, but he goes in deep, and Rumi can feel the tears gathering in her eyes as he forces her mouth open wider, his cock sliding against her tongue, against the surface of her mouth, head pushing through her throat, stopping right before she chokes on it. Her eyes are still fixed on him, watching the wide grin spread on his face. “Jeez, you look so fucking beautiful like this, Rumi.” 

She blinks. He must be lying. She’s a mess right now, even without a dick in her mouth. She knows her hair is unkempt. She knows her patterns are stretching out in full force. She knows that her eyes are mismatched, one completely claimed by her demonic half, the other dimming as her humanity continues to be stripped away from her. 

And yet, Jinu’s eyes are softening, his grin losing his mischief as he looks down on her, stroking the side of her face. 

“You look so beautiful, Rumi,” his whispers, and she hears the Jinu she’s gotten to know again. 

Her Jinu

Stray tears fall from the corner of her eyes as she starts to move, retracting it to pull him out slightly, before taking him in again, running her fangs along his shaft lightly, far from hurting him, just simply teasing. She presses her tongue against him, circling its circumference, tracing the veins that line it. As she bobs her head, she can feel Jinu start to thrust his hips, slow, gentle movements that match her pace, speeding up only when she starts to move faster and take him deeper. 

She feels heat between her legs again, her body flaring up with need as she continues to take him deeper into her throat. The need to feel more of him. The need to have him satisfy her with more than just his fingers. The need to have his cock in more than just her mouth.

She feels him pull her back, unlatching her lips from him. He’s breathing hard as he watches her, his narrow pupils dilating further and looking more demonic than before. The marks on his skin glow bright purple, illuminating them in a soft purple glow and Rumi wonders if she’s just too far gone that she thinks it feels almost romantic. 

“I need to be inside you,” he murmurs. “Not your mouth. But inside you. Your cunt.”

She takes a deep breath, steering herself from almost immediately offering herself to him and begging him to fuck her. She can’t make herself look too desperate. 

Just in case. 

“Fine, if you say so,” she replies. 

Jinu shakes his head. “No, only if you say so.”

“If I say no, you’re going to let me walk up and leave you hard and hanging like this?” She raises an eyebrow, coating her words with doubt. 

Even if deep down, she does not have any. 

“Yes.” He says. “If at any time, you want to leave, you’re free to leave.” 

“I might leave right now.”

“While I strongly suspect you won’t, you are free to. Go ahead,” he says and as if to prove his point, he straightens himself up and takes a step back. His hands fall to his pants and start to adjust them. 

“No, no,” Rum says quickly, getting up to her feet as well. 

Jinu smirks and points at her shorts. “Off.”

She nods, obediently pushing her shorts and underwear down and stepping out of them, wondering why she didn’t just wear a skirt instead. She really should make a mental note to opt for skirts more often if there’s a chance of her running into a hot demon backstage like this. 

Jinu pushes himself against her, pressing her to the wall, as he kisses her again, a more gentle kiss this time. His hands lift her by the hips again, positioning her above him before he pushes himself into her. Rumi arcs her back, hands grabbing onto his shoulders, legs winding around his hips. She buries her face into the crook of his neck as he pushes in her. He’s gentle, not wanting to hurt her any more beyond the pain of the first stretch, pausing to wait till she nods at him before moving again. His brings his hips back, withdrawing a little, before sliding in again, repeating the movement in a heavy rhythm. Rumi moans against his skin, biting down on his neck to muffle her moans as he slowly starts to pick up his speed. 

She tugs on the shirt he’s wearing and Jinu tears it off himself and drops it on the floor immediately, leaving him in the shredded t-shirt he was wearing underneath. But it’s not enough. She wants to feel his skin and with that thought driving her, she rips the t-shirt apart at its seam, her new demonic strength and claws coming in useful and surprising her for a moment. Jinu laughs as the fabric falls to the floor, still rocking into her in soothing strokes, as her hands clamber against his slick exposed skin, palms skimming his taut muscles. 

“Harder,” she murmurs, hugging herself closer to him again, face burying itself in the crook of his neck once more, hands sliding to his back. “I can take it. Don’t hold back.” 

“You sure?” he laughs. 

“Don’t underestimate me.” She bites down hard on him, hard, drawing blood the way he’d done with hers, tasting the metallic drops on her tongue. She wonders if it’s the demon in her that’s enjoying this, or if she’s just so desperate for him that she wants to have every inch, every drop of him. 

Jinu starts to speed up, his hips slamming hers at a dangerous speed. He’s ridiculously strong, she absentmindedly thinks, as he holds her up with one hand, back still supported by the wall, as the other hand sneaks between her legs to toy with her clit. Her claws dig into the tight muscles of his back, holding on to dear life as he continues to fuck her. Her head spins, completely lost to the world. Her mind is blank when she squeezes her eyes closed. She can’t remember where she is, or what she’s been doing before this. Everything is lost to her. 

Everything but Jinu. 

“Fuck, you’re so tight,” he growls and his hips snap a couple of times more before the wave from before washes over her, drawing a scream before she can muffle herself again. Jinu still holds her steady as she shivers, her breath slowly regaining its steady pattern. 

He’s still buried inside her, still hard and pulsing. 

Her eyes shoot open and she backs away to meet his smug look. 

No way she came so much earlier than he did. 

“You— You!” she cries, slamming her fist against his shoulder weakly, but as she does, she pauses at the sight of her hands. 

At any other time, it would be the blood on her nails that catches her attention, the reminder that she’d possibly been clawing through Jinu’s back, hard enough to draw blood. But none of them matters when she can see her patterns, stretching out in the same pinkish purple that marked his skin. She brings her other hand close as well, stares at her arms, then down at her torso and her bare thighs and legs that hang around his waist. 

Purple marking. 

Glowing. Gleaming. 

Bright. 

Shining markings that matched his. 

“You’re beautiful Rumi, even like this,” he murmurs and she shakes her head. 

It’s not possible. This is not possible. 

“You are,” he continues, leaning to kiss her ear again, before he whispers into it. “You’re so beautiful, every inch of you.” 

“No, I’m not—” Her voice breaks, her eyes catching his, his eyes shining gold, his features illuminated in purple. 

He’s beautiful.  

And she remembers what she had been trying to tell him previously. 

Even now, you’re still so pretty.

He is. 

And now, of course she is as well. 

Probably to him. 

Only to him. 

Because no one else in the world could love her when she’s like this, no one but him. 

“I need you,” she whispers, holding on tightly to him. “I need all of you, Jinu.” 

“I know,” he murmurs. He kisses the underside of her jaw. “Will you have me, Rumi? The demon me? The one you’ve sworn to hate?” 

The one she’s grown to love

“Yes,” she whispers. She’s clenching down on him. “God, yes.”

“There’s no God here,” he says as he lets her down, pulling out of her, leaving her in slight confusion for a moment. “Only demons.” 

He kisses her once more, then spins her around. Bends her forward, till her ass sticks out and she’s leaning against the wall, hands flat. Her eyes fix on those two hands, on the purple markings that embellish her fingers, on the tips bloodied with his blood. 

This time, when Jinu pushes into her, he fucks her. 

Quite literally fucks her. 

She screams his name from the force of the first push, no longer having anything to muffle her voice with. Jinu is brutal in his thrusts, no longer following the same slow rhythm as before, but ruthlessly pounding into her, reaching deeper than before. A clawed hand snakes to her front, sliding under her top, squeezing her breast and tweaking her nipple. His other hand rests on her ass, claws digging into the skin, probably breaking it, probably drawing blood, but the pain is lost to her from the way he fucks her hard. 

“You’re so fucking beautiful, Rumi,” he growls. His teeth bite down on the clothed curve of her neck, tearing the fabric of the top to expose her skin, skimming his fangs along it before sinking them into her skin. 

Rumi throws her head back in a moan. 

“So, so beautiful,” he murmurs. 

Everything hurts and yet, she wants more— wants him to bite her more, to mark her more. She doesn’t know how she’s going to be able to walk after he’s done with her. 

His hand moves from her breast, leaving her nipple sore and aching, to hold her by the chin, turning her head around just enough for him to kiss her again, a kiss far hungrier than before. 

He bites down on her lip. 

She bites his tongue. 

Drink up the blood— both his and hers. 

They push against each other further and further, exploring their bodies in every possible way, drinking up every inch of each other’s presence. She keeps wanting him closer and closer, even when he’s all against her. 

He groans into her kiss. His hand falls to her throat, fingers wrapping around it, almost in a dangerous warning, the obsessive temptation that he is. 

“Please,” she finds herself saying. 

“You’re perfect,” he murmurs back as his fingers squeeze around her throat, impeding her breathing, till all there is in her lungs is the scent of him. Her eyes fall close and she feels his movements going erratic. His mouth is by her ear, whispering sweet taunts that are completely lost to her, even as she weakly nods her head to all he says. His tongue traces the curve of her ear, his fangs pierce any skin they can find. A clawed finger continues to rub her clit roughly. It’s sore from his constant touch, but she doesn’t care. 

Because it feels good. 

It feels so good. 

His fingers loosen around her neck and she finds herself gasping as she catches her breath. They tighten again and this time, when all air is cut off her, when her head goes light and colors dance at the back of her eyelids, everything comes crashing down. 

She’s coming over his cock with the loudest scream of his name. 

“That’s it.” She is barely aware of his voice. “Let them hear your beautiful voice. Let them hear who’s making you like this.” 

Jinu, she wants to say. Jinu, Jinu, Jinu.  

It’s her scream that brings him over the edge. He comes with a broken growl of her name, pulling out just in time to spill his need over her ass and back. 

As the high of her orgasm fades, as her senses slowly start to return, all she is aware of is Jinu leaning over her, his body still brushing against her back as he breathes deeply. He has a hand over hers now, fingers lacing together, a mismatch of their gleaming patterns.

And as she stands in place, flushed against him, all she can think about it how neither is making the first move. 

Neither of them are trying to shatter the illusion they had just created, basking and embracing it for as long as they can. 

Because Jinu knows he can’t pull her over. 

And she has a deep feeling she can’t pull him either. 

Notes:

lowkey wanted to make the saja boys catch them in the act but nvm only jinu gets to see rumi like this. i just think them being demons can come in handy in sooooo many different way.

500 kudos and i'll do demon sex for zoey and her pet dog.
1000 kudos and mira's stepping on two pink demons.
10k kudos for baby x his water bottle.

just kidding.
or maybe not. idk.

i actually have another rujinu fic in the works, though less demonic and more hopeful/happy. it was a little long and had too much of the saja boys so i got bored writing it, but maybe i might finish that one day.