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The Sin

Summary:

"Shhh. Why don't you just take it, Sister Rin?" Bunny asks, shoving his fingers down his throat. "there we go~ that should shut you up, shouldn't it?"

 

"mmf!" Rin muffles around his fingers, brows pinched together, "mmh! hmff hmmf!"

 

"Sorry? What's that? Can't hear you~"

Or, Rin summons a demon in an attempt to get back at his brother and ends up losing himself on fat demon cock.

Notes:

Another sprinted work LMAO do not expect peak. I DID HAVE FUN THO AND THATS ALL THAT MATTERSSS

Hope u enjoy!

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

Work Text:

Rin had always been so good, obedient. Often, Sae would push him around, making him run his errands for him and do whatever he asked. It's not like he was inherently mean, it's just how things were. Sae is his older brother, he's always been overprotective and had trouble with letting Rin out of his sight or straying too far from the church, so he wouldn't let him out unless it was a special occasion, giving him plenty of tasks to keep him busy.

 

That was all fine by Rin, for the most part. He'd do almost anything for his brother, and it really didn't bother him too much. Not until recently, at least.

 

Sae has started getting especially pushy with him, particular about how he wanted things done. So, Rin, finally fed up with his brother and his constant holy needs, found himself hiding in his room late at night with a Ouija board. His fingers gently set on the planchette.

 

"I open this space for you to communicate to me," he whispers, "Oh great spirits… please, answer my call."

 

The planchette moved, and Rin stared down in awe as it drifted.

 

"Hello," he mutters quietly, "Are you… a ghost?"

 

The planchette slid to "no" almost automatically.

 

"Then a… demon?" Rin whispered, cheeks gone pink.

 

"Yes" the planchette answered with another smooth slide to the opposite end of the board.

 

"What's your name?" Rin asks carefully.

 

He watches as the planchette slides to the first letter. "B.." then the next, "U.." Rin repeats, "N… N…" he whispers quietly, "And… Y?"

 

The planchette flits back to yes and Rin bites his lip. "Bunny?"

 

The candle flickers before burning out, and Rin squeaks—though his mouth is quickly cloaked with black fog, a figure looming over him, slowly taking shape. When he opens his eyes, Bunny is standing above him, gazing down with bright red eyes.

 

Rin stares up, teal eyes gone wide, more expression showing on his face than he's let slip for years,

 

"Oh, sweet sister Rin~ That's your name, isn't it?" Bunny asks, his fingertips grazing down Rin's mouth, cupping his chin and tilting his head up, "You're just so beautiful," he whispers. "No wonder that priest brother of yours keeps you in such a tight leash."

 

Rin's brows furrow. "I-I'm sorry?" Rin stutters out, "You're— the demon from the board?" he asks quietly.

 

"Yup~ The name's Bunny," he speaks simply, stalking around Rin. "Tell me, what's a sweet little thing like you doing calling upon demons in the middle of the night?" he asks, "Are you, perhaps, rebelling against your big brother?"

 

"No—Yes?" Rin squeaks, suddenly all to unsure of himself. He shouldn't have done this, Sae was going to kill him, Sae was going to be so so angry!

 

"Oh, darling. Don't be scared of me." Bunny's hand slides along his shoulder, and then suddenly, as if he's teleported, he's at his side, pressing a soft kiss to his cheek. "Tell me, Rin. Tell me why you brought me here. If it wasn't to get to that ugly prissy priest… maybe it was because you had some unfulfilled needs~"

 

Rin wets his lips, gazing up, gaping like a fish, "I… I wanted.." Rin doesn't know what to say. He hadn't thought any of this would really work. Yet, here Bunny was standing before him.

"Wanted to..?" Bunny teases, "Come on sister. Tell me exactly what you want and maybe I can show you some things I'm positive you've never seen before." Bunny purrs, running his hands down Rin's sides now.


Rin swallows nervously. "I did… want to rebel against Sae but I… I thought this was all fake?"


"I'm so very far from fake." Bunny responds, purring into his ear and slowly licking the shell of it.

 

"Wh-What are you doing?" Rin asks, his eyes shimmering with fear.

"I'm trying to seduce my little nun, of course." Bunny grins, "That's what you really want me for right? That's why you summoned an incubus of all things?" Bunny's hand slides into the soft, black fabric of Rin's sleeve, trailing up his arm.


"An… incubus?" Rin repeats slowly, "No I—" he starts, but Bunny is already on him again, nipping at his skin, completely ignoring his rejections.

 

"You meant to summon what? A normal old house ghost. Oh, those ones always send the big guns for things like you. Let's just say… they don't really enjoy you church folk."


Rin's eyes fall shut, "I can't be touched though— I'll be excommunicated from the church," Rin blushes.

 

It's not like the demon wasn't handsome, he was quite honestly very attractive, large and broad, Had pretty ruby eyes and soft white hair with dark black horns protruding from his head. A long cross-shaped skull on his face as well.

 

"You won't eat my soul, will you?" he asks quietly.

 

"I'm not here for your soul, darling~ I'm here for that pretty little thing between your legs." Bunny coos, bending down to tease Rin further, large taloned hands clawing gently at his dress robes. "You'd look so pretty below me, Rin… and oh, I know you'd do exactly what you wanted. You'd have gotten back at that evil big brother of yours tenfold~"

 

"I don't know," Rin says, looking down at the floor, "If I do this, I could be in real trouble…"


"You've already come so far though, haven't you? You'll likely be excommunicated anyways, why not have some fun while you're at it? C'mon sister… let me treat that sweet pussy right."


Rin shudders, a chill running down his spine. Yet, he couldn't deny that the space between his thighs was quickly growing damp with attention he was far from used to.


"If I do this… will I still get to go to heaven with nii-chan?" Rin asks, his big teal eyes sparkling.


"But of course," Bunny smiles, "Why wouldn't you? You are one of God's children still, Rin." his long talon slowly begins lifting Rin's skirt up. "My sweet darling, all you have to do is pray for forgiveness, that's what your god says, yes?"


"Yes," Rin exhales shakily, "Yes, Bunny…"


"My, how good you are." Bunny coos, lifting the skirt higher, revealing a sweet little chastity belt beneath it. "Oh? Look at that, darling… goodness." Bunny sighs in awe, "You're going to let me take this off, right?" he asks, grin growing wider, "I'm sure that ugly, awful 'nii-chan' of yours won't mind in the slightest~" he lies.


"P-Please…" Rin whispers, breath catching in his throat as the demon crawled between his thighs.

"Press those pretty little hands together and beg your god for it," Bunny orders, voice lowering an octave and eyes darkening significantly with pure, unbridled lust.

 

"Please," Rin begs, closing his eyes with his hands pressed together.


Bunny's fingers mess with the little lock on the belt for a moment, listening to Rin's sweet little prayers to his God. Then, with a small snap, the belt breaks free and Rin's gorgeous pussy is exposed to him.

"Fuck," Bunny groans, immediately running his fingers through Rin's folds, "Look at you… my, such a lovely little flower you have down here~ I just want to eat it up~"

Rin whines shyly, trying to press his thighs together, but Bunny only pushes them further apart. "Mmh… so fucking beautiful. Don't hide from me."


"I don't think we should—-" Rin starts, eyes gone glossy.

 

"Too late~ we're already bound," Bunny lies, "Don't you feel the pull, Rin? My, you've tied yourself to me, maybe even for eternity~" Bunny coos, his eyes locking in on Rin's pink cunt, slowly slipping one taloned finger into his hot, wet hole, scraping at his insides.


"B-Bunny!" Rin gasps, "Hurts—!"

 

His face is scrunched up oh-so-cutely and Bunny is tempted to lean in and and kiss him already, to make him make even more adorable faces by plunging his fingers even deeper inside, carving him out entirely for his own use.

 

"Shh… but you're taking it all so well," Bunny responds quietly, "Oh, dear sweet little one…." he coos, finding the smaller absolutely edible and enticing.

Rin looks up, little tears building in his eyes as he gently tugs at Bunny's own clothes, pulling him in closer. "B-But I…. I've never—"

 

"Shhh, I know" Bunny coos, "It's okay, I'll take great care of you."
His taloned finger slides out with a slick noise before he's shifting his hand to Rin's thigh, squeezing ever so harshly.


"But—" There's a thud from next door, and Bunny, who is far too impatient to undress his little treat, fully unclothes him with a snap of his fingers.

there Rin is, sweet and pretty and completely nude beneath him now. His sinful little body on display for the eyes of Bunny and Bunny only. He's certain that if Sae walks in, he'll have his face splashed with holy water in an instant. Afterall, he'd met with the elder one once or twice as well. Though, their relationship was nothing like this—informational transactions only, not even close to sexual. So, with that all done and over, it was only right for Bunny to pray on Rin, who clearly wanted him so badly.

 

"Rin, you're dripping." Bunny hums in awe, "So beautiful and flushed, all just for me, hm?"

 

"I—I.." Rin never really can get much out for words when he's being stared at like this, and so he decides to stop trying, letting his ruby red cheeks and body do all the talking for him and his feelings.

 

Another sound thuds and Bunny sighs as he removes his own clothes. "It sounds like that big brother of yours might be going insane looking for you~ But don't worry, I've put a special seal on the door. He won't know anything so long as we're in here." Bunny purrs.

 

"Rin!" the younger hears Sae yell distantly.

 

Rin tries his best to cover himself, but Bunny is already on him the second he does, tackling him to the floor and running a hand up his inner thigh.

 

"You know, maybe I could take you just like this… I'm sure your little hole could take me~" Bunny responds, spreading his thighs further apart with one hand while the other frees his cock.

 

Rin looks down, immediately going tomato red as he gazes at the large thing in all it's glory.

 

His cock was dark and ribbed, long and thick, Rin had never seen anything like it before. Even when his brother would punish him by making him get on his knees, his cock had never looked like this.


"h-huge.." Rin whispers, biting at his bottom lip.

 

"You like what you see, Rin?" Bunny asks.


Rin swears he can hear Sae pounding on the door, but Bunny looks so good above him that he's willing to ignore it entirely. After all, he was in this mess in the first place because Sae had made him angry. All of this was to prove that he could act out too, that he didn't have to follow his orders.

 

"Rin! Open the door!" Sae shouts, and Rin reaches up for Bunny.

 

"Please, please hurry.." Rin whispers, his cheeks flushing.

 

"Mh, cause you're worried, right?" Bunny asks, slowly guiding his cock to Rin's hole. "Do you think you can take it?" he hums, "Can you really take it?"


Rin blushes, "probably not, but… I want to hurry."

 

Bunny's eyes linger right on the cute little pair of tits on Rin's chest, leaning down and placing a hot, open-mouthed kiss on both of them, his cockhead slowly beginning to push into Rin's precious little virgin hole. "Fuuuck" Bunny exhales, watching himself be sucked in.

 

"nngh!" Rin moans, arms wrapping around Bunny's shoulders, "a-ahh…" Rin whines, biting his bottom lip. "It's so—- it hurts."


"Shhh…. go ahead, keep going…" Bunny purrs, "Keep taking me into your pretty little cunt, Rin." he groans, biting at his breast and squeezing his waist.

 

He wanted his hands all over the smaller man. God, he was so fucking tight, he felt amazing. Not to mention, what a good way to piss off an old friend. He couldn't help it when he bucked his hips in deeper, shoving way too much of himself in at once, tearing a scream from Rin's lips.

 

"Fuck, I'm gonna ruin you" he growls, buried deep within his own pleasure, his strength only growing with every inch he pushed inside of the other.


He should eat him, really. But it was much too soon for anything like that, so he'd continue as he was, fucking Rin's little hole and tasting his sweet, sugary skin for now.

 

"Bunny!" Rin gasps, trembling in his hold, "It's too much— too much!" he complains, moaning quietly and arching his back. "P-Please…"

 

"You don't want me to pull out do you? Your precious virginity wasted for nothing?"


Rin whines, shaking his head. "N-No.. I'm sorry.." he sniffles, tears freely flowing down his cheeks now as he continues to take Bunny's torturous cock.

 

Bunny pushed in all of the way, halting his hips deep inside of him and letting out a breathy sigh. "Shit, Rin…"

 

Sae was shouting outside still, but neither of them listened, not like Rin could with the way blood was flowing through his ears anyways.

 

"I-I…" Rin whimpers, "I'm too—" he sniffles, "too full."

 

Bunny laughs quietly, 'Oh darling," he whispers, "This is just what real, good cock feels like," he says, pulling out a little before thrusting back in, trying to get Rin used to it faster.

 

Rin whimpers out in pain again, and Bunny can see the trail of red blood flowing down his dick from breaking his hymn, immediately making his cock only throb further inside of him.

 

"Look at that, you're already breaking for me." Bunny laughs.


"Wh-What?" Rin squeaks, sniffling again and looking down at the space between them, "I'm bleeding? No—no why am I bleeding?" Rin whimpers, his eyes widened again, his fear stinging Bunny's nostrils.

 

"Don't worry, that's just from your hymn breaking, lovely~ You'll be okay, I promise."

 

Bunny pulls out again and then slams back in and once more Rin is rendered entirely speechless, his little tits bouncing with the force of Bunny's hips bullying his insides.

 

Rin looked up, watching as Bunny thrusted into him again, his lips parting in another loud cry.

 

"Rin! Open the fucking door!" Sae shouts. "You better not be doing what I think you are!"

Rin gasps softly. "Y-You said he wouldn't know!" he sniffles.

 

"Well, he can't see inside or open the door. I never said he couldn't hear us. Unfortunately, spells don't go that far." Bunny hums, a clear and obvious lie. He'd definitely left that out of the spell on purpose, wanted Sae to catch them, to torture him if only a little.

 

"You—" Rin cries, "You!" he can't get words out again, too focused on the way Bunny's hips are speeding up, the larger man fucking him properly, bullying his cock into his womb with each and every harsh thrust of his hips.

 

"I what, darling?" Bunny purrs, "Oh no, you trusted the big bad demon and let him take your virginity!" Bunny teases, laughing at him as he continues to fuck him, loving the way the man's eyes seem to glimmer even brighter teal with all of his shimmering tears.

 

"But I—I! You told me—" Rin sobs outwardly.

 

"Shhh. Why don't you just take it, Sister Rin?" Bunny asks, shoving his fingers down his throat. "there we go~ that should shut you up, shouldn't it?"


"mmf!" Rin muffles around his fingers, brows pinched together, "mmh! hmff hmmf!"

 

"Sorry? What's that? Can't hear you~" Bunny teases, fucking him harder, lifting Rin's leg over his shoulder with his other hand as he snaps his hips forward, burying himself even deeper. "I can feel you squeezing around me. You've lasted so long all things considered little darling. Are you finally going to cum?"


Rin doesn't respond, only moaning and drooling around his fingers before finally breaking down with a choked, muffled sob, squirting around Bunny's cock. "mmf!"

 

"oh, good little thing," Bunny groans, his cock now squelching with each and every push of his hips, beginning to reach his own peak, "I should leave my mark on you, shouldn't I? How about we show that big brother of yours something?"

 

Rin shakes his head quickly, but Bunny's claw is already digging into his soft little tummy, drawing a little heart into his skin with a light trail of blood.

 

Rin cried out at his burning touch, squirming on his cock. Then, right then, Sae burst into the room, eyes wild and dark, pissed as he watched Bunny plunge into his little brother for a final time before he painted his womb with cum.

 

"Bastard!" he shouts, walking over and ripping Bunny off with a nasty snarl. "How dare you—-how fucking dare you! You vile, ugly thing!"

 

Rin sobs as Bunny's torn from his body, immediately moving to cover himself up, sniffling and pressing his thighs together as cum poured from his hole.

 

"Rin," Sae breathed. "Get dressed now. Then. I want you on your knees by the altar."

 

"Y-Yes, nii-chan.." Rin whispers, immediately moving to search for his robes.

 

"Come now, Sae… don't be so harsh. It was all my idea, you know." Bunny says. "And Rin was so good for me. You should be praising him, if anything."

 

Sae grabs at Bunny's shirt, not daring to look down. "Get out of our home, demon. You're lucky I don't kill you."

 

Bunny snorts, "You couldn't if you wanted."

 

"Don't push your luck, underworld scum." Sae mutters.


Rin doesn't speak to either of them, now dressed back in his robes, hair tucked away under his veils. "N-Nii-chan…?"

 

"Rin," Sae says shakily. "Do as I told you. Go."

 

"Don't want your little brother knowing that you and I use each other for information?"

 

"Shut up or—" he takes a deep, hissing breath in and grabs at his bible.

 

"Fine, fine. I'm going. It was good fucking you, Rin~"

 

Rin hides himself in his veil, and as soon as the demon is gone in a cloud of smoke, Sae grabs at him and pulls him out of the room.

 

"Insolent whore," he mutters beneath his breath, "Stupid, fucking slut."

 

Rin starts crying again, the words piercing him straight into his heart. "But… Nii-chan I—"

 

"I don't want to hear a single other word from you," Sae warns, shoving Rin to the ground in front of the altar. "You wanted cock so bad, right, Rin?" he asks, bringing his own out from it's confines, "Then let me cleanse you with my holy cum again."

 

Rin gazes up, lips parted slightly and cheeks stained with tears. "But I.."

 

"I said, no 'but's from you, Rin. Go on and repent for your sins, slut."

Notes:

I hope you liked it! As always, please feel free to leave kudos and comments, they're very much so appreciated <333

I hope u have a lovely day~

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