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Part 1 of The I.N Saga
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2026-05-15
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INsatiable

Summary:

As the maknae of the group, Jeongin was used to getting whatever he wanted; his brother would deny him nothing. But what Jeongin wants more than anything right now is you. And that scares you more than anything else.

Notes:

Hello, my lovelies, and thank you so much for reading this story! So this is not the first Stray Kids fic I've written; it's actually the first that I've written that's seen its way to completion (mostly because a certain multigrain menace wouldn't stop wrecking me until I gave him his own story *eyeroll*). I've written dozens of fics since I was a teenager, but mostly about pro wrestling, WWE in particular, and this is my very first story that I'm publishing here on AO3 after numerous requests (lots of requests/screaming/threats of bread attacks--YOU KNOW WHO YOU ARE), so...nothing left to do but go on to the story. Thank you again for reading, please feel free to leave feedback and tell me what you think (it's greatly appreciated; seriously, it keeps the muses fed), and just...enjoy! On to the story!

Work Text:

“INsatiable” - Starring I.N

He's staring at you again.

You really wished he wouldn't stare so fucking much. It bothered you so much when Jeongin stared, so unashamedly.

For the past few weeks, whenever you'd come over to visit your boyfriend, his younger brother was always home, always finding some excuse to lurk around the house whenever you were there, no matter how many times Chan politely told him to fuck off, or gave him some obscure reason to get out of the house so the two of you could have some alone time. One time you had visited, and Chan had given Jeongin $50 so that he could hang out with some of his own friends, so the two of you could watch a movie and hang out alone together in peace.

You were sure that the little bastard had doubled back, just so he could watch as Chan fucked you on the couch.

You were convinced you had heard a quiet moan when Chan propped you on your hands and knees and fucked your ass.

The kid had it bad for you, and didn't even try to hide it.

When you'd gone to Chan with your suspicions, he'd merely laughed and shrugged it off as his brother being curious. “He's a kid, he'll grow out of it,” he'd said, watching you as you mixed together eggs for scrambling. “Besides, have you heard yourself moan?” he'd asked, coming up behind you to nuzzle your neck. “I wouldn't blame him for being curious; you're fucking intoxicating when you moan my name.”

“Chan, that's not the point,” you argued, trying not to melt into his touch as his hands began exploring your body, one hand traveling under your shirt to cup one breast, while the other traveled to the waistband of your shorts, starting to wind its way inside to the treasure inside.

You let out a breathy moan as his fingers began to tease your nipple, while the other hand slowly began to brush against your folds. “What is the point then, baby?” he asked quietly against your ear, giving your earlobe a quick nip when you opened your mouth to answer, causing your brain to short-circuit.

The feel of his fingers teasing your folds, then slipping through to tease your clit brought a quiet moan forth from your lips, and your head tipped back against his shoulder, your eyes closing as his ministrations continued. “Can...can you talk to him, please? Maybe tell him not to be so obvious with his staring, if he's gonna watch me?”

Chan hummed against your ear, giving it another nip as he moved the hand that had been teasing your nipple down to your waist, where he took hold of your waist and pulled you flush up against him. You felt his cock pressing into your ass, and your breath hitched, tilting your head to the side to allow him access to your neck as he gave shallow thrusts against your backside. “I can do that. I'm thinking I can also do that other thing you wanted me to do as well, since you're being so patient and understanding about my brother.”

“And what's that?” you breathe, completely forgetting about the fact that you had been trying to make breakfast for the brothers.

Chan's fingers continued circling your clit, and you could feel the wolfish smile cross his face when your breath began to slightly escalate. “Thinking of dyeing my hair your favorite color for your birthday.”

“Oh, really?” Your eyes widen, and your lips parted on a gasp, as the circles on your clit got tighter and tighter. “Oh, fuck, Chan--”

“But I need you to do something for me,” he whispered against your ear, his thrusts against your ass growing rougher as your moans grew increasingly louder. “Let up on my brother a little bit, baby. Let him have a little fun. I know you enjoy the chase; it's why you're here with me now. Just as long as he knows at the end of the day who you belong to. ”

With a growl, he removed his hand from your clit and used his free hand to shove your shorts down, bending you over the kitchen counter, before freeing himself from his own shorts and sliding inside you.

And as you moaned Chan's name as he fucked you in the kitchen, a little thought in the back of your head formed...of Jeongin, a little piece of you hoped that the little shit was watching Chan rail you in their home, hoped that he could see what his older brother was doing to you, to see for himself up close and personal what he'd jerked off to so many times since you and Chan had first started dating, and get jealous.

Little did you know...

Jeongin had heard every word.

Right down to Chan giving you permission to allow his younger brother to pursue you.

Trying to gulp down the sudden lump in his dry throat at the sight of your luscious ass bouncing in the air as Chan drove into your pussy, he quickly made his way back to his own room, his cock hardening at the sounds of your moans as Chan pushed you to a very vocal orgasm echoed in his ears.

He swallowed hard again, just knowing that soon, soon enough, he'd be the one you made those moans for.

It was only a matter of time.

~*~

A few mornings later, you were back over at Chan's place, taking a shower after spending the night, and waking up that morning to his head between your legs, him treating you to two orgasms as a good morning greeting.

Your body ached in the most delicious way, your pussy still throbbing from Chan's tongue, his fingers, his cock...even though you had just cleaned yourself, you could feel yourself growing wet again, just at the thought of Chan sliding himself into your tight wet heat again. A shiver passed through you at the memory of you having to bury your face into his pillows as he reached the rhythm he knew you both enjoyed, hard and sensual. Sex between the two of you had always been intimate, full of passion, but Chan also knew that you loved when he just fucked the shit out of you just as much as you loved it when he took his time savoring you and driving you to climax after glorious climax before even once thinking about his own pleasure. It was a big reason why the two of you meshed so well; you both had duality that each complemented the other.

You turned off the water and climbed out of the shower, grabbing a towel from the rack on the back of the door to dry your hair, and another to wrap around your naked body before heading back into Chan's room, where you settled yourself down on his bed.

Thoughts of that morning replayed in your head—dreaming of hands running up your calves, over your knees, along your thighs to your hips, the curious feel of your panties being eased down your legs and your thighs being parted, before the gentle tickle of breath on your clit that felt far too real to be a dream, your eyes flying open mid-moan to see Chan's dark head between your thighs, gently parting your folds to tease his tongue along your sensitive bud before inserting two fingers inside you, his head lifting at your body stirring, and the mischievous glint in his eyes as he sped up, whispering “Good morning, baby,” before diving back between your legs with a feral growl of hunger—and before you knew it, you were spread on Chan's bed again, the towel beneath you, your own fingers diving into your wet pussy again to recreate that magical feel of Chan's fingers inside you.

Heated mews passed your lips as you briefly withdrew the digits to slide them along your clit, mirroring the way Chan had done so, before inserting them back inside you, a louder moan escaping as you burned hotter. Images assailed your mind of what happened after you'd awakened—Chan fingering you relentlessly, his tongue devouring you until you were a sobbing mess from the sensations, your thighs nearly suffocating him as you came on his face, his growls of approval as he slurped up your juices, before turning you gently onto your stomach and sliding into you with a moan of satisfaction.

“Jesus, noona, you look like a whole present, gift-wrapped just for me.”

“What the fuck, Jeongin?!” you nearly shriek, shooting up to the head of the bed, burrowing under the blankets to hide your naked body. Judging by the expression on his face, Jeongin had seen everything you'd been doing, and wanted the show to continue.

“By all means, noona, don't let me stop you. You were pretty engaged, from what I could see,” he said with a laugh.

You glared at the shit-eating grin on his face. “What the fuck are you doing in here, Jeongin? I thought Chan told you to not come in here when he wasn't home.”

“Well normally I wouldn't have come in, but even the Lord's strongest soldier would have sat up and paid at least some attention, with the way you were moaning.”

Your heart sank. “I...I was moaning?”

His head dipped, those dimples on full display. “Oh yeah. It was probably some of the hottest sounds I've ever heard, noona. Made me wonder if someone was dying in here.” His eyes then trailed down the blanket to where you knew he was envisioning your still-naked body. “Imagine my surprise when I see it's you, touching yourself. My brother is a lucky man, noona; if that were me, I'd never not be between your legs. That pretty pussy would never know a moment's peace, if you were mine.”

Your eyes widened; this was not the Innie you knew when you and Chan had first started dating. He'd been an innocent kid, fresh-faced and full of possibilities; then something had snapped in him; you'd had no idea what it was—could it have been any of the times you and Chan had had sex in his house that caused the change?--but all of a sudden, whenever you'd come around, he'd go quiet, and sometimes you would catch him staring.

At first, it hadn't bothered you; Chan had written it off as him getting used to his older brother having a life of his own, so you hadn't thought of it again.

Then, the silence turned to staring.

The staring turned to a quiet hunger.

You hadn't realized it at the time, but it had caused you to spiral.

It also seemed to bring out a different side of Chan, a bit more of an exhibitionist side of him. Where before, the two of you would leave the house often to hang out, oftentimes over at your place, sometimes other places, most times now he preferred to stay home, or come back to his place after a night out, where you would inevitably spend the night. Chan knew you were more responsive when he was rougher, so he would make it a point to make sure he hit your sweet spot as often as he could, enjoying your loud moans, encouraging you to be as vocal as possible.

Now that Jeongin was openly staring and making no attempt to hide how badly he wanted you, you weren't entirely comfortable with it.

It still intrigued you, though, as someone who loved the chase. It was what drew Chan to you; the fact that you'd wanted one another, but you wanted him to hunt you. But still...Innie was like a younger brother to you. He wasn't supposed to be looking at you like that. He wasn't supposed to be thinking of you the way Chan did.

He wasn't supposed to want you.

You bunched the covers around your naked form even more, suddenly even more aware of Jeongin's eyes on you. He cocked his head to the side, those eyes of his darkening even more. “Noona, you don't have to hide from me,” he said softly, that dimpled smile turning predatory. “You act like I'm the big, bad wolf, about to devour you.”

You scoffed, hoping he would get the hint and fucking leave. “Aren't you?”

That grin grew even wider, even more predatory. “Oh, don't worry, Noona. I'm not going to do anything you don't want me to. In fact...” His eyes lingered at the outline of your hips and thighs under the blanket, and reached down to adjust himself, making no attempt to hide how aroused your moans had made him. “...I have a feeling I'll be seeing you naked and moaning again soon enough. And it won't be for my brother.”

“Stop, Jeongin!”

“What's the matter, noona?” he taunted softly, a mock innocent look crossing his face. “You can tease me, but I'm not allowed to tell you how the thought of you touching yourself has me hard as fuck?”

“When the fuck did I--?”

“You here, all the time. Always around in those tiny fucking shorts and panties, sometimes not even the shorts. The way you indulge my brother's exhibitionism. I don't see you fighting him off when he wants to fuck in the living room, or in the kitchen, when you're supposed to be making breakfast,” he says simply, like he was discussing the weather with you. “The only eggs that got scrambled that morning were yours, on the countertop.”

“Were you fucking spying on us?” Your tone was breathless, incredulous. He shrugged carelessly, as if watching you and his brother having sex was part of his daily routine, like a morning jog, or having a cup of coffee with his breakfast.

“I can't help it. You drive me crazy, noona. Fucking out of my mind. When are you going to stop resisting me and just give in? I promise it'll be well worth your while.”

“Get the fuck out, Jeongin!” you snap, throwing a pillow at him. “Get the fuck out, or I swear, I'm cracking you in the dick with one of Chan's huge ass shoes!” He threw up his hands in mock defense, that predatory smirk still on his face as he backed out of Chan's room.

“The sooner you give in, Noona, the better things will be for you. I have big plans for tearing that pussy up.”

“Fuck. Off!

You slammed the door behind him, his laughter echoing down the hall as he went back to his room.

~*~

Later that night, you had decided to make dinner as a special treat for the brothers. Your famous pork chops that Chan adored, with special seasonings and spices that were flavorful rather than spicy, taking Chan's aversion to any form of spicy food into consideration.

As the meat cooked on the stovetop, you turned the heat down to a lower temperature so that it could take its time to cook completely, while you turned your attention to making side dishes to go with the chops. You had just bent over to grab a saucepan out of a lower cabinet, when you felt it. You could feel the burn of an intense gaze on you, and a low curse. Thinking it was Chan both appreciating the delicious fragrance of cooking meat as well as the delicious view his girlfriend was giving him, you straightened up and turned, a bright smile on your face.

“You're home early, baby—fucking Christ, Jeongin!”

Jeongin leaned casually against the doorway to the kitchen, that same annoying fuckass smirk on his face as he watched you. “Smells delicious, noona,” he said casually, his arms crossing across his chest—a very toned and muscular chest, you noted, irritation lacing through you for taking notice. “Looks delicious, too.”

“Thank you,” you responded, flattered, rising to your feet. “It's my special batch of pork chops--”

“I wasn't talking about dinner, Noona,” he said, that shit-eating smirk on full display once more. His eyes raked over you appreciatively, taking note of the T-shirt dress you had chosen to wear, and how well they showed off your legs. Legs that he constantly envisioned wrapping around his waist, or, even better, his head.

You sighed in annoyance, turning back to flip your chops before they burned, slamming a pan on the stove top and crossing to the fridge to grab fresh vegetables. “What do you want, Innie? Besides wasting my time with your dirty thoughts. As you can see, I'm making dinner.”

“Why make dinner when you look like dinner and dessert all rolled into one luscious package that I can't wait to unwrap and devour whole?”

Smooth motherfucker, you thought to yourself, a slight flash of intrigue breaking through the irritation to grace a small smile on your face, one that you quickly hid from the younger man as you began to pile washed leafy greens into the pot to begin cooking. Jeongin then smiled once more.

“See, noona, I can be nice as well as naughty.”

You sighed and turned to face him. “Innie, what happened to you? Why are you so fixated on trying to get me to open my legs for you? What makes you think this—any of this—is going to impress me enough to want to even consider having sex with you?”

“Well, you've been with my brother for a long time, noona,” he said, his eyes traveling up and down the length of your body, “and I've noticed a lot about you in the time you've been together. First, you love being chased. You loved it when my brother pursued you; you made him work for it, because that's what gets you wet, the chase. Second, you may not want to acknowledge it, but you love when I give you my attention. You pretend that you don't like when I watch you, but you secretly love it. Third—and this is the most important one, so you may want to pay attention here, noona—my brother and I share everything. I've just been biding my time, waiting for you to realize that this was inevitable.”

You'd tried to remain impassive as his voice got lower as he ticked off each of his reasons for pursuing you as intensely as he had been, but you couldn't deny the shiver that went through you when he called you out on how much you loved the attention. You craved it; it was one of your secret desires; being pursued, being wanted. Chan had discovered it early on in his courtship of you, and he'd made it a game of cat and mouse, one that ended up with the two of you being discovered in his best friend Hyunjin's basement midway through a party, with your face buried into a pillow, your panties in your mouth, and your ass in the air, screaming Chan's name with him buried balls deep inside you while everyone else partied on the first floor of Hyunjin's home.

To this day, Hyunjin still has the two of you banned from sitting together on any couches in his home. The story still brings tears of laughter to Chan's eyes.

As much as you loved the idea of being pursued, of someone interested in you chasing you, wearing you down until you had no choice but to give in to them, it still felt weird, because it was Jeongin. He was your boyfriend's brother; he was your friend. He was younger than you. You'd known him since he was practically a kid. He was family.

The mere thought of him being attracted to you, wanting to be the reason you moaned and screamed, the reason you came, had your shoulders stiffening up in resistance.

“Stop overthinking, noona,” came Jeongin's soft voice from behind you. You almost leaped out of your skin when you felt hands touching your hips, caressing them, before they were pulled backwards against a rock hard body, the hard poke of a thick erection pressing against your ass.

You gasped. Jeongin growled.

“Do you feel that, noona?” he growled in your ear, leaning down to nuzzle your neck. “That's what you do to me. And I know you're dripping wet for it. I'm not that kid that used to tag around behind you and Chan all those years ago. I'm a grown man now, noona. Stop overthinking. Give in to what you want.”

“I don't,” you tried to say firmly, but it came out more as an unsure whisper. You tried to focus on dinner, the boiling pots of rice and greens on the stove, anything to avoid the young man. “I don't want—”

A hard grip of your hips and a thrust against your ass had you suddenly braced against the counters on either side of the stovetop, gasping, trying to regain what little composure you had left. “You're lying, noona,” he breathed in your ear, taunting you.

When you didn't answer him, he reached past you to the stove, turning the dial on both boiling pots, turning them off. “Dinner's ready, noona,” he breathed, slowly turning you to face him. “But I think I'd like to try dessert first, if that's okay with you.”

Before you could say anything, Jeongin dropped to his knees in front of you, his hands slowly sliding up your thighs. With each brush of his slender fingers on your skin, the closer he got to the hem of your dress, your breath hitched in your throat. His own breath remained steady and calm, almost to the point of offending you, because he nearly had you hyperventilating. His fingers slid up your thighs then down again, lightly raking his nails along your thighs; you bit back a light moan, trying not to let it show how much his actions affected you. However, Jeongin was already attuned to your reactions, and he picked up on your moan, bringing a devious grin to his face.

“What was that, noona?” he asked softly, dangerously.

You froze.

“Nothing...” you breathed, your body betraying you by leaning closer to Jeongin, who tsked lightly.

“Lying again, noona,” he purred, trailing his hands back up your thighs, this time not stopping until they reached underneath your T-shirt dress, where they rested on your waistband, at the band of your panties. “Are you this dishonest with my brother about how you react to his touch?”

“Fuck off, Jeongin, I don't have to lie to Chan about anything,” you snap, trying to maintain some semblance of control over yourself, to make it seem like his touch wasn't causing you to slowly unravel, like one look from him wasn't enough to have you spreading your legs for him in a heartbeat.

He merely grinned again, this one all the more lethal in response to your fiery reaction. “But you have no problem lying to yourself,” he shot back, “dare me to prove it?” Before you could let out a single breath to stop him, his hands yanked down your panties, shoving them down your hips, where they pooled pitifully near your ankles.

You nearly fainted on the spot.

“Mother—fuuuuuck!

Your breath caught mid-curse as Jeongin mercilessly shoved two fingers into your pussy. You threw your head back and moaned at the intrusion, your walls tightening on instinct around his fingers, ripping a husky groan from his throat.

He didn't spare you in the least, his fingers thrusting inside you, curling exactly the way you liked that had you writhing and gasping against his hand, your fingers tangling in his hair as you whined at the waves of pleasure washing over you.

“God, you're so tight, noona,” he moaned appreciatively, in awe at the sight of his fingers disappearing inside you, sliding in and out so perfectly. “I can only imagine how good it'd feel for my dick to stretch this tiny pussy.” He gave another lick, groaning in pleasure, the taste of you sending vibrations of pleasure straight to his dick.

He needed more, he had to have more.

You nearly came right then and there against the kitchen counter as he buried his face between your legs and ran his tongue along your clit. Your hips bucked, bumping your clit against his tongue even more, and your legs nearly gave out at the sensation. Your fingers tightened its grip on his hair, your nails digging into his scalp, causing him to hiss and in turn retaliate by nipping at your clit.

Your legs actually did give out then, collapsing into Jeogin's arms, who easily caught you and lifted you back up, wrapping your legs around his waist and carrying you with ease over to the table, where he draped you across it, your legs dangling over the edge.

“God, Noona, you're dripping wet for me, and I've barely done anything to you,” he teased, dark eyes glinting with dangerous desire. “I only gave your clit the tiniest nibble, and you're falling to pieces. How on earth are you going to handle the rest of it?”

Your legs were shaking as he knelt back between your legs, with the eyes of someone who had discovered the gates of heaven, or some sort of forbidden treasure, gently draping your legs over his shoulders. “I'm not going to stop until my tongue goes as deep as it possibly can, Noona,” he said, his voice now raspy with arousal. “Think you can take it?”

“Shut the fuck up and give it to me, asshole,” you snarl, finally dropping all hints of pretense. He had won. He had you where he wanted you; there was no other choice but to surrender to this man and his devilish fucking tongue. With a smile that was purely feral, Jeongin promptly dropped back to your dripping pussy and resumed his ministrations.

Jeongin's tongue was long and wicked, and you had to give it to the little shit—he knew exactly how to use it. He licked, he suckled, he slurped, he fucked—every swipe of his tongue against your entrance had you moaning for more; every delicious, teasing lap of his tongue against your sensitive clit had you arching off the table, thighs tightening around his head, boxing him in so that he had nowhere to go. For his part, Jeongin loved the taste of you; it was like ambrosia laced with cocaine for him, sweet and savory, and everything he had dreamed of. Now he knew why his brother spent so much time between your legs, he thought lightly as he swirled his tongue along your entrance, before thrusting it inside, so deep, you could almost swear he reached your intestines.

“Holy fuck, Innie!” you gasped, bucking your hips against him uncontrollably. You ground your pussy against his face, your hands shoving him deeper into your wetness, rolling your hips until he growled in irritation and wrapped his arms around your thighs, gripping them tightly.

“Sit—the fuck—still,” he snarled, holding you in place with blazing eyes. “Don't fucking run now, Noona; this is what you wanted. No more games. No more chasing. No more running from me.”

He shoved his face back between your legs, and you swore he'd been holding a grudge, the way he ate your pussy now that he held you still. Savoring licks that bordered on greedy, his tongue thrusting deeper and deeper inside you with each inward thrust, alternating between his tongue and fingers fucking you relentlessly, sucking on your clit like it gave him sustenance; it was too much for you to bear, and your hips began bucking again, your body twisting and writing beneath him as your orgasm bubbled to the surface like liquid fire.

“Jeongin—fuckin' Christ, I can't—oh my god...”

Your thighs shook around his head, your legs tightened. Your fingers dug into his scalp even more as you whimpered his name, fucking you as thoroughly as possible as you tried your damnedest to fuck his face, desperately seeking out some kind of relief from the exquisite torture.

“Oh god, Jeongin, I'm gonna—I can't take it—fuuuuuuuck—you're so deep, holy shit—!”

“That's it baby,” he snarled, thrusting two fingers back inside you at a feverish pace, sealing his lips to your clit, “cum for me, Y/N. Let that pretty pussy cum all over me, love. Be my good girl and fucking flood me.”

He sank his teeth into your clit one last time, and you fucking lost it.

Maybe your soul left your body.

Maybe you fucking ascended past the heavens and shot straight to fucking Saturn with how hard you came.

You screamed his name as you came, exploding all over his face, your juices shooting out and drenching him as your pleasure died out, your body utterly trembling from the exertion. And Jeongin? Fucking Jeongin prolonged the shit by fucking you through it, his fingers bringing out every last drop from your drenched core until your pleasure had completely died out, leaving you a quivering, sobbing mess on the table, gasping for breath, sobbing in the full knowledge that now, even as he sat there looking at you like you'd given him the greatest gift of all time and it still wasn't enough, there was no going back.

Jeongin had pushed things too far.

There was no way he could be just your boyfriend's younger brother anymore.

He wanted more. And you knew that he wouldn't stop until he had more. Once he'd claimed you, he wouldn't stop until he had you beneath him, his dick buried between your legs, taking everything you had to offer and more.

He wouldn't stop until you were his.

And God have mercy, you weren't sure if you had the strength to keep fighting him off.

You didn't even know now if you wanted to fight him anymore.

And Chan?

Chan stood in the doorway of the kitchen, watching the entire time with a knowing smile on his face...

Almost as if everything had gone according to his plans.

End.

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