FAMILY AFFAIRS - ISAGI YOICHI
synopsis: You've got everything in life. A happy marriage with the love of your life, a new job, and you have enough savings to buy a new house! Luckily enough, your kind stepbrother offers to come with you to the open house tour while your husband is busy and away. Nothing can go possibly wrong, right?
contents: explicit content, afab!fem!reader, stepbro!isagi, reader is married to sae, reader also wears a dress hehe, cheating, manipulation, dub-con, step cest, isagi is jealous and is a bully, kinda borderline yandere!isagi, hickeys, cunnilingus, fingering, unprotected sex, creampies, pet names/name-calling, dumbification, doggy/missionary/mating press, ass slapping, dacryphilia, light choking, having sex while on a phone call (oral), mirror sex, mdni word count: 3.9K a/n: part 1 of my kinktober event! idk probably the filthiest thing I've ever written in my life idk what to make of it but enjoy (im sorry sae whoops) and i swear im a good girl
Compared to how most remarriages go, you have to say that your family is part of the lucky ones.
It happened back in high school, where all the weird emotions and hormones of a teenager are at its high but, surprisingly, your stepbrother and stepfather were extremely easy-going people. And they still are. Your stepfather treats your mom with utmost care and grace, something you haven't seen in a while since your biological father stepped out of your life.
Your stepbrother, now a pro football player, is almost a carbon copy. Growing up, Isagi has always been willing to help out around the house, staying up to help you study for exams throughout undergrad and, even now, he's offering to come with you to do something that'll take up half of his off day.
"Hey," You shut your phone after sending a brief message to your husband as Isagi hops into the driver’s seat, hair slightly damp and wearing an oversized hoodie with a pair of sweats as he had just gotten out of the shower. "Thanks for coming with me, you didn’t have to."
Your stepbrother shrugs his shoulders in response as he adjusts the side and rearview mirrors before starting the ignition. "I’ve got nothing going on today. Besides," Isagi eyes you playfully and pinches your exposed thighs between your dress leg slits. "Who knows what might happen if I let you go off by yourself?"
You return the favor with a light slap over his head, earning a loud yelp from the male. "It’s just an open house tour, not like I’m going off to war."
He scoffs cheekily, fixing his hair. "Yeah, but the realtor could be a serial killer or worse—" Isagi leans towards you and lowers his voice. "—an undercover clown."
You shrink, back pressing against the car door, and laugh. "The only undercover clown I see here is you.”
"You’re so lame." Isagi huffs before stepping on the gas pedal.
After a quick game of rock, paper, and scissors over who gets possession of the aux, he begrudgingly accepts defeat and allows you to play everything but country. When he manages to get on the highway, he speaks again, turning down the music volume just slightly. "What’s Sae up to these days? I hardly see him come to our family functions anymore."
You stop humming to the current song and break your gaze from the window. There's a small frown that forms, without you realizing it, and you bite your lips. "You know how his schedule usually is. Campaigns and interviews got him busier nowadays. But he should be landing home later."
"Later today?" Isagi quirks a brow.
You nod, shifting in your seat. "Mhm, he said he’ll call me once the flight lands. Why?"
There’s a long pause before Isagi answers, shrugging his shoulders, and turns at the exit. "No reason."
The drive there is relatively smooth. You guys pass the time with quick snippets of what's going on in your lives since Isagi had just returned overseas from a match and, despite not really knowing the ins and outs of football that much, you're still willing to listen to whatever he's rambling on about. It's one of the small things that you adore about Isagi, he's shamelessly passionate about his career, and oddly enough, the conversation gives you a burst of energy.
You shoot back with your own life updates, though a bit more mild and mundane to his travels and exciting goals. You briefly mention a new job promotion, your closest friends announcing their pregnancy, Sae's new ad campaigns, and all the other houses you've toured within the past three months. The current house you're viewing today seems promising and within Sae's expected pay range.
From what you've seen online, it's a three-story house built near the edge of a hill with an attached infinity pool, a masterchef-styled kitchen, and a private built-in gym. You don't really need all of that, but who are you to deny your husband's generosity?
Isagi lets out a long whistle when he pulls up next to the realtor's car on the long, winding driveway. "You're seriously gonna be living here?" He seems to be in disbelief at the size and so are you. It's a lot bigger in person than what the pictures offer.
"Maybe," You hop out of the car, brushing off any sort of dust collecting to your dress, and adjust your purse straps. "Hopefully, this will be the one."
While you didn’t think the realtor would be a creep, Isagi wasn’t wrong when he suggested tagging along. Upon entering the house, the realtor immediately makes an unwarranted comment about your figure, commenting on how nicely the dress hugs your body before offering his hand. Isagi intercepts smoothly by introducing himself as your boyfriend, which honestly came out of left field, but at least the realtor backed off for the remainder of the tour. After an hour of showcasing, the agent hands his business card to Isagi and nearly stumbles over his feet when leaving the property.
"Is he gone?"
Isagi pulls one of the curtains aside and nods. "Yeah, his car isn’t in the driveway anymore."
"Ugh, it’s a shame but at least the place is nice." You briefly snap a couple of photos of the living room and kitchen. "I think we might put in an offer by the end of the week."
"It's not too far from my place either," Isagi adds. He wanders around the kitchen some more, pulling the cabinet drawers open and playing with the faucets carefree now that the agent is out of sight. "Think I could crash here sometime?" He jokes.
"As much as I love having your annoying ass around, I think not." You giggle when a cute pout forms on his lips. "Okay, maybe like once a month." It's hard to say no to your stepbrother sometimes.
You meet up with him in the kitchen, hands gently gliding across the marble kitchen countertop and stopping when Isagi manages to pull out an unopened champagne bottle from the fridge. He waves it around for a bit before signaling at the glasses in the cupboards.
Isagi bites his lips thoughtfully. "You wanna?"
Why not? It's been quite the ride to get here and you like to think of this as an early celebration. You pull out two glasses and eagerly watch as Isagi opens the bottle. He fumbles a bit with the top and a good amount of the liquid starts spilling out, dripping over the countertop and onto the floor.
"Shit, wait let me clean that up—" He rushes to grab a nearby towel though you beat him to it with your own pair of napkins from your purse.
"It's okay, I've got it, Yoichi." You start to bend down but he grabs a hold of your wrist, forcing you back up.
"No," His tone is firm and you could've sworn there's something fleeting that flashes across his eyes for a moment. "Let me take care of it."
And for whatever reason, you let him. "Alright..."
Isagi takes his time cleaning up the spill. He's careful like that, maybe because he knows you're insistent on buying this property. Knowing him, he wants to make sure everything is perfect.
His hands stop when it reaches your shoes and you feel your breath catching in your throat. The sight of him on his knees triggers a reaction you can't quite understand. You shove the thoughts away and cough loud enough once you notice him hesitating.
"Is there something wrong?" Your voice comes out faint, almost breathy.
"It got on your dress," Isagi states casually, lifting his head to meet your confused gaze. "Mind if I get that for you?" He whispers the last part as if there's a hidden intention behind his words.
You're not sure if your dress got wet. You're positive that nothing spilled on it. But, according to your kinder-spirited stepbrother, there are a few spots and you suppose it'll be bad to leave it unattended.
"Sure," You answer on instinct.
"That's good," Isagi begins dabbing the cloth gently against the fabric, slowly making his way up until he's hovering over your pelvis.
You have no idea why you're starting to feel yourself burn all over the place. It feels like Isagi is taking mental pictures of your figure, storing them all in his head as you feel his eyes trace your skin. Goosebumps start trailing down your arms and you shift your legs together. "Yoichi—"
Isagi stops his motions and tips his head down, letting his bangs fall over his eyes. He lets the towel fall to the floor and you twitch when you begin to feel his callous palms hiking all the way up your legs. It's strangely hypnotic, watching your stepbrother do this and you're not sure why you're allowing it to happen. Everything begins to feel hazy, surreal, and wrong.
Your gut twists on itself inside out when his fingers toy with the waistband of your panties. Surely, there are some champagne spills there? Right? Maybe that's why you feel comfortable spreading your legs for him to clean it up. The two of you silently exchange dazed glances when you guide his hands, brushing the panties to the side of your legs as your heat gains exposure to the air.
"Gotta clean this one too," He rasps out. And you take a deep, shuddering breath when Isagi's lips latch onto your folds, wasting no time with his tongue. You feel like your heart is going to pound out of your chest.
A thousand questions flood through your mind. Has he always viewed you this way? How are you going to present this to Sae? Should you even say anything to your husband at this point? They're the wrong questions to be focusing on, you know that better than anyone. In a split second, your healthy relationship with Isagi has opened so many cracks around its edges that it's now something completely irreparable.
And you're ashamed of just how goddamn good this feels.
"You're so sweet down here." Isagi's eyes are half-lidded when he looks up at you, already seemingly drunk off of you.
Your eyes threaten to flutter shut as his tongue traces around, larping up your intoxicating slick. Isagi lets out a low groan when your fingers run through his hair, gripping it just slightly forward enough to allow his nose to brush against your aching nerve.
All of this comes crashing down when a familiar ringtone goes off. You nearly jump at the rapid vibrations from your purse and hastily fish out your phone, heart dropping at the contact that's on the screen.
"Pick it up, I'll be quiet." The way that easily comes out of his mouth makes you want to throw up.
You swallow back a moan and clench the phone tight in your hands. "Yoichi, I'm being serious...! If he finds out we're both dead!"
"Then make me."
His hot breath hovers over your clit as he looks up, masking his ill intentions behind his seemingly big, innocent eyes. Those very same eyes that would comfort you after a bad day, the same eyes that shine whenever you told him about an achievement—no matter how big or small—, and the very same eyes that are now clouded with something more sinister as he searches for an answer in your own pair.
"If you don't want it then push me away. Make up your mind or else Sae's gonna be worried." Isagi mocks your voice when attempting to say your husband's name. The way it rolls off his tongue makes your stomach churn and the wedding band on your hand suddenly feels unbearably tight.
You shouldn't. You know better. You're in love with Sae Itoshi and this—whatever this is—needs to stop.
"You're turning into a mess down here, sis." You attempt to close your legs together but his grip is like iron. Isagi tilts his head to the side and huffs over your nub. "I said push me, baby."
"Y-Yoi—" Your words get stuck in your throat as he 'accidentally' brushes his lips against your heat. Another dark glint flashes across his eyes and he grins.
You pick up the call and clear your throat, but your free hand wanders to your stepbrother's head, giving him the slightest nudge so that his nose brushes against your slick heat.
"Hi babe, how is everything?" You're trying so hard to level your voice.
"Just landed," Sae replies. There are muffled voices in the background, which you assume are his bodyguards and paparazzi. After some awkward shuffling, he asks, "Are you at the property right now?"
"Yeah," You continue to tug at Isagi's hair, suppressing a moan when he flicks his tongue a bit too hard over your sensitive nub. "It's spacious and has a nice backyard, I—I think you'll like it." You're beginning to pant, almost whining, under your stepbrother's touch.
"Mhm, send over pictures when you can. Is Isagi with you right now?"
You nearly choke out a sob as his fingers begin to edge their way inside. "Y-Yes!" You sputter out, launching forward as your knees begin to grow weak.
"Hey, are you okay?"
You can't stop the twitching and bucking of your legs. Isagi notices and wraps a free arm around the back of your legs, keeping you upright and pressed against his face. "I-I'm fine, why?" You breathe out.
"You sound like you're sick." Sae is concerned. Concerned for your well-being while you are currently getting fingered by your stepbrother.
You almost cry when you feel Isagi’s fingers slip out of your sloppy folds. He gets up from his knees, gripping your waist as you stumble forward from the loss in pleasure, and grabs a hold of your phone. As if he's playing a game, Isagi holds up a finger to his lips, silently asking you to keep quiet. It’s almost scary how fast you see him transition from being an absolute monster to back to being your loving stepbrother all in a second.
Even with his mouth covered in your slick, he clears his throat and speaks with confidence to Sae. "She's feeling a bit down now but I'll drive her back once we're done."
"Is that so?" Sae lets out a heavy sigh. "Thanks, Isagi. I should be back before dinner so keep me updated."
"Anytime, we'll see you later!" Isagi grins over the line before twisting his head down at you. "Sis, do you have anything else to say?" There is it. That look again. His smile sends shivers down your legs as he presses the device to your ear, rubbing it firmly against the side of your face.
You can't find the power within you to break free from Isagi's taunting gaze. The way his lips grow wider as fear washes over yours makes you only fall for his touch just more. It's almost addicting as much as it's wrong.
"I love you, Sae." You force out the words and your stepbrother has the audacity to laugh.
Thankfully, Sae doesn't hear it. "I love you too. I'll talk to you guys later." And the line drops.
Isagi doesn't give you time to recollect your thoughts as he plunges his fingers back into your warmth. Your body staggers under him, hips matching his feverous rhythm, throwing the last of your morals out the window.
"Oh my god—!"
"You love him, yeah?" He hums in the crook of your neck and presses his hardened length against your plush thighs. "Love him more than me?" Isagi coos.
You throw your head into his chest, eyes shut tight, and inhale his stimulating scent. "I love him, y-yes I do...!" You fumble over the words and make a mournful sound.
"Is that so? Well, it doesn't matter either way—" Isagi drags you easily in his arms to the bedroom and positions himself behind you while facing the full-body mirror by the closet. "—because you're going to be screaming out my name." He pulls down your dress straps and starts leaving hungry, sloppy kisses across your neck and shoulder blades.
A shaky breath escapes your lips and you shut your eyes, tilting your head to the side, allowing him even more access. "Yoi..."
"Look at yourself, sis." His sudden sharp tone makes your eyes shoot up. His sweatpants fall down around his thighs and you see him stroking his thick length in the mirror. Isagi presses it against your increasingly wet folds, groaning from how easily your body accepts him, and gives your ass a harsh slap. "Watch how I fuck you."
You can barely recognize yourself in the mirror. Lipstick smeared, tears pooling at your eyes from a mixture of pleasure and guilt, dress straps slipping off your flushed shoulders, and the numerous amounts of hickeys from your stepbrother marred against your skin. And you still have that damn wedding ring on.
Isagi sucks his teeth in as he watches your chest rise and fall when he slowly enters you. The feeling is different compared to Sae's.
Your stepbrother's cock is thicker and angled more to the right, hitting and stretching out spots that you didn't know existed. Once you bottom him out, Isagi pulls back his hips before snapping them back into place. Just one thrust from him is enough to knock the air out of you. He keeps repeating the motion until you're a writhing mess and a puddle from your heat collects onto the hardwood floor.
"A-Ah—w-wait fuckfuckfuck...!"
Isagi snatches your face in his hand and pulls you up against his chest, making his cock nest deeper into your velvety walls. "Visit me often, yeah? It's not fair that he gets to fuck this pretty pussy every day."
You let out a muffled moan when Isagi collides his lips against yours, his tongue immediately seeking refuge in your mouth. Everything feels so hazy, so intense, nothing like this reminds you of how sweet and gentle Isagi usually treats you.
"Baby," He breathes, relocating his hand on your face to your neck, he gives it a tender squeeze. "I'm better, aren't I?" Isagi lets out a whine when he feels your insides tightening up around him.
Your eyes are glossed over, drool seeping out from the edge of your mouth as you mumble, "I—I don’t know… I’m—aaah…”
"Huh? What was that?" He pulls back, keeping the tip in, and chuckles when he watches your face twist in disappointment at the loss of feeling. "Say it and I'll give you what you want."
Isagi watches your reflection, paying close attention to the way your lips quiver at your next words. It's almost as if he's getting off at seeing your internal conflict with tears sticking hot against your lashes. Finally, you give in. "Y-You're better, Yoichi... you fill me up more than Sae..."
His eyes widen with glee. "That's what I fucking thought." Within seconds, he adjusts his grip on your hips and snaps back into your puffy folds. "If he ever makes you cry, you know your big brother is going to take care of you, right? No one can take care of you like I can."
You catch your breath when his toned biceps lift you in his arms. The second your back meets the mattress, his length stretches your hot entrance again.
"Shit, it's like you're made for me," Your legs hang limp over his shoulders as he presses deeper. "You take me in so good."
You pant uncontrollably under him, wanting to start sentences but being unable to finish as his thrusts and the lewd wet sounds from your heat bounce off the walls. You can tell by the dark look in Isagi's eyes that he relishes in the feeling of making you feel overwhelmed and stimulated. Every time when you call out his name, when your moans are forced out by his animalistic thrusts, he clenches his grip harder around you.
"Get on your knees, baby," Isagi coos and he lets out a dark chuckle when you obediently nod.
You struggle to get on all fours, lower body shaken to its core from the intense raw pleasure. You’re taken aback when you see the sheer amount of sweat and other bodily fluids that stain the mattress sheets beneath you. While you're brain is trying to process how on earth you guys are going to clean this up, Isagi has taken hostage your hips again, lifts your dress up, and is already repositioning himself from behind. With a swift swipe of his tip, he claims his territory once again.
"Fuck," He hisses, watching the plump of your ass jiggle at every thrust he makes. His other hand twists underneath you, digits finding their home on your clit. "You make the sweetest sounds, you know that?"
A familiar coil builds in your stomach. A feeling that has brought you and Sae closer dozens of times before. Only, this time, you feel yourself about to come undone by the hands of a different man. As his fingers work their final motion around your throbbing clit, your vision turns foggy, and your body slumps onto the mattress as your orgasm washes over you. Isagi groans as your walls fluctuate and squeeze desperately around his length, sending him close to his own ending.
His fingers dig deep into the flesh of your ass, leaving half-crescent moons, as he pumps streaks of white inside and pulls out immediately, allowing some to finish dribbling out on your back. The sight of you spasming with the combination of both your and his fluids spewing out causes him to moan in delight.
"Once a month, right?" He repeats your earlier promise, hot breath ticking your wet skin. When he realizes that you're too dumb-fucked to respond back, he reaches over and attempts to wipe the sweat collecting on your face. His normal bright smile comes back and it's like nothing has changed. "Let's get ready to meet up with Sae."
There's a heavy shift in the air when dinner arrives.
Isagi had graciously offered his hoodie to cover up the hickeys, knowing damn well that your husband is going to see them regardless when you return to your shared apartment. Still, Isagi believes he's still doing his due diligence as a good stepbrother.
You're sitting across from Sae and have been avoiding both males' gazes throughout the evening. From the second you sat down, to the moment Sae kissed your cheek, it felt so hard to breathe. You're not sure if Isagi is helping or making the situation worse by rubbing his hand back and forth on your thigh.
It's almost an hour into dinner and you've only taken three bites and are on your third glass of wine. Being the attentive husband he is, Sae picks up on your uneasiness and sets down his fork.
"Everything alright?" Sae eyes the two of you across the table.
"Yeah," Isagi speaks for you and curls an arm around your shoulder. "She's just feeling under the weather, remember?"
You're too overwhelmed by everything going on, so you lean into his touch, hands gripping your thighs in the process like you're trying to crush something, knuckles white and fingertips bruising.
You hate how going back to your husband's arms after this, talking about your future together, and potentially starting a family—all of it seems like it's the most daunting feeling in the world.
KINKTOBER TAGLIST (PART I)
@milkistoshi @mareonyan @saenora @blissblossom @wowonamo