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twistedbunni · 4 months ago

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Big Brother's Love

A/N: finished reading TR today, and BOY is Sanzu a crazy mf, but I still love him. I got this idea bc I remember reading multiple fic of reading being a younger sis to the Haitani bros who perv on her and I got an idea for a Sanzu x sibling!reader. Sorry for any errors spelling or grammar wise.

Synopsis/Warning: Reader is gender neutral, not an actual sibling of the Akashi family but grew up close to Senju as a kid and thus sees the Akashi siblings as "family". Reader gets dumped by their bf and seeks comfort from their "big bro Haruchiyo" who takes advantage of the situation like the twisted freak he is. This is smut with use of derogatory words (bc ofc it's Sanzu after all) pseudo-incest? Light fluff at end

You'd gotten the break up text just hours earlier, you're now ex boyfriend having dumped you seemingly out of the blue with no clear reason. You couldn't think of a single person to turn to for comfort over this, all your friends would surely give you some variation of "I told you so" after warning you endlessly not to get involved with some delinquent punk. Over the past few years you'd drifted apart from the group of siblings you'd called your own brothers and sister, highly doubting they'd be of any comfort to you now, but you still wanted to reach out in hopes they'd have their "sibling's" back.

Takeomi straight up left you on read and Senju texted you back with a "sorry to hear" along with an excuse of being busy with running her gang, which only left you with Haruchiyo to ask but you didn't have his number anymore. Miraculously you somehow did have is apartment address, how you managed to have that but not his number was a baffling mystery to you, however you took full advantage of that knowledge and headed over to his place.

When the pink haired male opened his door only to see you standing there like a sad lost little animal, he'd nearly shut the door in your face but he stopped himself from actually doing so.

"Big brother Haruchiyo..." You sniffled out, looking at him with big sad eyes that seemed to tug at a chord inside the male, but not in the way you'd hope.

"I told you not to call me that anymore, I'm not your brother, so call me Sanzu." The man crossed his arms and glared lightly at you, clearly annoyed by your presence. "What the hell do you want anyways?"

"My boyfriend dumped me!" You sniffled some more and wiped your teary eyes with one of your sleeves. "He just suddenly texted me that he's breaking up with me, even though we'd been together for over over a year!"

Sanzu stands, still seeming annoyed and now very uninterested in helping you with whatever this drama was. "So? Why the fuck are you here crying on my doorstep? Shouldn't you be off sobbing to a friend or your other so called siblings?"

Pouting at Sanzu, you cross your own arms. "Takeomi ignored me and Senju says she's too busy with her gang. I thought just maybe my big brother Haruchiyo might comfort me like he did when we were kids and I'd cry."

Sanzu stood silently taking in the sight of your tear-stained face, feeling a dark desire to see you cry more and break that bratty attitude of yours. Against his better judgement he feigned a sigh, acting as if he was giving in to your sad younger sibling act and stepped aside to allow you to enter. "Fine, come in but don't get my place filthy with your damn snotty nose."

Not even giving him a second to reconsider or change his mind and take back the invitation, you pushed past him to enter his apartment. Quickly kicking off your shoes, you hurried in further into the apartment and towards the living room to curl up on the couch.

Sanzu following you in, sits down leaving a little gap between the two of you that you quickly close by scooting closer to lay your head on his shoulder. "The hell are you doing now? I said you could come in, not cling onto me however the fuck you please bitch."

"Don't be so mean to me, my heart was just broken and I need my big brother to comfort me like he use to do when we were kids." You pout once more, eyes growing watery again as you stare up at the annoyed male.

"I'm not your brother, and we're not kids anymore. I only comforted you as a kid cause you were a whiny little brat who'd cry all the time and only shut up if I gave you a little attention." He pushes you off his shoulder, seemingly dusting your germs off himself right after.

"Then give me attention so I shut up, it worked as a kid so surely it'll work now too." Trying to lean back on him, you're only pushed away again.

"You're still the same whiny little shit you were back then, huh?" Sanzu glares at you a bit.

If Sanzu won't give you the attention you want, then you'll just force him to, you think as you stand and move to straddle his lap. "I missed you big brother Haruchiyo, and I want you to give me attention to help me feel better about my ex dumping me."

Feeling annoyed by your bratty attitude at first, a switch seems to click in Sanzu's head that quickly has him realizing just how to use your own actions in his favor. Grabbing your hips, he pulls you closer to him on his lap. "You really want your big bro to give you attention that badly? Fine then I'll give you some attention but you better not bitch about it or else I'll kick you out."

The feeling of satisfaction you have over getting your way is short lived, being replaced by a feeling of utter shock as Sanzu grinds his hips up into yours. Trying trying your best not to whimper from the sudden, unexpected friction of Sanzu grinding himself up into you, you manage to whisper out. "What are you doing?"

"Giving you some fucking attention so you shut up already." He gives you a dark look, the scars at the corner of his mouth moving upwards as he smiles at you almost villainous like. "You know what they say, the best way to get over someone is to get under someone else."

Grabbing onto Sanzu's shoulders you try to lift yourself off his lap, only to have him forcibly pull you back down and grip your hips tighter to hold you in place. "Sanzu, this isn't-"

He cuts you off, leaning forward to press his chest against yours and whisper into your ear. "Isn't what you wanted? Too bad bitch, you're the one who sat on my lap and demanded I give you some type of attention. Well I'm doing just that, and damn your getting me hard."

As if to emphasize his last statement he forces your hips down harder, grinding himself up into you so you can feel just how hard he's becoming. The feeling of his rather large length grinding so deliciously against you, even through both of your layers of clothes, causes a moan to escape you before you can stop it.

"Looks like someone's getting excited over their big brother's cock, huh?" He teases you almost mockingly, licking the shell of your ear. "I always thought you were kinda cute, even though you use to bug the hell outta me and followed me around like Senju fucking did. Who knew such a whiny brat would become such a needy slut for me someday."

Trying to compose yourself only fails miserably, Sanzu having you nearly wrapped around his finger so easily at this point, all you can do is moan as the pink haired man continues to grind you (quite literally) into submission. "Sanzu~"

Really leaning into the whole brother dynamic you always pushed into him, he starts to use it against you as a fantasy for his own sick enjoyment. "Why don't you take off your sweater, let your big brother see how pretty his younger sibling has become.."

Acting almost on autopilot from the subconscious desire to make the guy you call your brother happy, you follow his orders. Slipping off your sweater, you toss it aside carelessly and now feeling slight regret over not having put on anything underneath said sweater.

Taking in the view of your bare torso for a moment, Sanzu licks his lips hungrily. Your skin is free from any bites, bruises, hickies, or any other signs of marking made by a lover and he's eager to change that. "That little prick that dumped you is obviously stupid. Not only did he break up with someone so fucking hot, but he didn't even leave a single trace of himself on you."

Having stopped grinding your hips together, Sanzu now puts his full attention on your chest and neck. Biting and sucking at your soft flesh to pepper his mark over you, looking like some form of sick poka-dots made of bite marks and hickies. The sensation pulling more noises from you, that sound practically like music to Sanzu at this point.

Tangling your fingers into his long hair, you gently scratch his scalp and occasionally lightly tug on his hair. "Sanzu... That- that tickles a bit.."

Leaning back to look at your flustered face and how hazy your gaze has become with lust, Sanzu chuckles. "Sorry, I guess your big brother got carried away with worshipping your pretty body. Speaking of which..." He takes a hand off your hip to grab your chin, running this thumb along your bottom lip. "How about we put your whiny little mouth to use now. Hop off my lap and suck your big brother's cock, okay?"

Again feeling the desire to make him happy, you get off Sanzu's lap and kneel on the floor between his legs. Undoing his belt and the button of his pants you decide to use a trick you'd seen only done in lewd comics online. Biting into the little handle piece of his pant's zipper, you use your teeth to pull it and unzip the zipper.

"Damn, where'd you learn something so naughty? What happened to my innocent little sibling, all I see is a pretty little slut eager to make their brother happy." Sanzu pets the top of your head, honestly having felt more turned on by your little trick.

Sanzu then lifts his hips a bit for you, allowing you to pull his pants and boxers down to his mid thigh. Somewhat surprised by the size and length of his dick, you nearly drool a little before you plant a small kiss to the tip, earning a small groan from Sanzu. "Your cock is so pretty, big brother Haruchiyo..."

The pink haired man only smirks as he watches you give his tip a few more kisses and licks before you place the head of his cock into your mouth. Softly sucking, you swirl your tongue around the tip and keep your gaze locked on Sanzu's expression. "Fuck, don't tease me like that. Big brother wants to feel how good your throat and mouth really are, baby."

Obeying his request, you slowly begin to bob your head on his length, gradually taking more and more of him into your mouth everytime your head goes down on him. After a few minutes, Sanzu gets impatient and grabs both sides of your head to pull it fully down on him. You gag a little, thankfully not hard enough to throw up and he takes that as his sign to continue, now moving your head on himself as if you're mouth and throat are his personal Fleshlight. "Fuck yeah. Just like that, your throat feel so fucking good. Who knew my sibling was such a slut that they can suck their brother's cock like a pro."

He continues to use your mouth till his groaning out curses under his breath and forces your head fully down onto him, holding you there as he spills the biggest load you swear you've ever encountered, down your poor abused throat. After he lets go, you pull yourself off him, panting and coughing a bit, before happily showing him you'd swallowed every last drop he gave you.

Grabbing your chin again, he presses his thumb to your tongue, smirking almost as if proud of you. "That's a good slut, you didn't waste a single drop of big brother's cum."

You try to speak, finding it hard to do with Sanzu's thumb in your mouth and restricting you tongue's movement, but it's clear what your trying to say. "What's my reward for being good?"

"You think you deserve a reward for just that?" He removes his hand from your face, wiping off his thumb on the hem of his shirt. The look he gives you both excites and worries you, a sadistic glint in his eye as he stands. "Get up and go bend yourself over my bed, bitch"

Doing as he says you scramble to your feet, practically running to his bed and bending yourself over it just like he ordered. Sanzu comes to stand behind you, using his leg he knocks your own open a bit wider then removes your own pants. Having rid himself of his own shirt and fully taken off his pants, Sanzu leans over you grinding his dick against your ass.

"Your precious big brother Haruchiyo is about to fuck you into the mattress, and after I'm done you're gonna promise to be mine from now on. No more big brother shit after tonight, you're gonna become my little toy and maybe I'll let you call me your new boyfriend." He whispers in your ear, bringing one of his hands down to your hole and gently pressing a finger against the entrance.

"Please... Please Sanzu, fuck me and make me yours." You beg, feeling so needy and desperate to feel him inside you that you almost sound pathetic.

He pushes a finger into you, curling and pumping it inside of you before adding another. "Oh, I will. I promise you that, but first I want to make sure you're ready for me. It'd suck if I tore you in half before I can properly use you even once." He continues to finger your hole, making comments about how hot and needy you feel as you squirm around his fingers.

"Just put it in Sanzu... I need it!" You whine out, earning you a harsh slap on the ass, that you yelp at.

"Fine, you wanna be a greedy little slut for my cock, then take it" He growls out, in an instant he's slamming his full length into you. The suddenness causing you to yelp once more and see stars for a moment.

Giving you barely any time to adjust before he starts moving his hips, you moan out strings of curses and clutch at the mattress beneath you. "Ah- slow down... It's too much!"

"Too bad, I already gave you what you wanted by putting it in before you were ready, so now you can deal with the consequences." He laughs out, setting a rather quick pace and making sure to slam himself deep with every thrust. "There's no way I could stop or slow down now, not when your insides are practically trying to snap my dick clean off."

Rendered speechless already, all you can do is moan and babble out Sanzu's name occasionally as he continues to use you for his own pleasure. A knot of pleasure building in your own stomach and slowly growing bigger with each of Sanzu's thrusts. "Sanzu.. m'close.. too close"

He laughs at you, wanting to find it pathetic that your gonna come after just mere minutes but in truth he can feel his own orgasm creeping up. "Me too... your wall are so tight and feel so good you're gonna make me bust prematurely."

He picks up the pace of his hips, nearly Jack hammering his hips into yours till your orgasm abruptly crashes over you without any warning. As you begin to twitch beneath him, Sanzu gives a few more thrusts into you, abruptly slamming himself as deep as he can into you before spilling his load and collapsing onto of you.

The pair of you lie there for a moment, catching your breaths and coming down from both of your respective highs. "Sanzu, I think I'm over my break up now, thank you for comforting me." You giggle out, not feeling any sort of sadness of the loss of your past relationship or the guy you'd dated.

"You better be over it. You're mine now and I don't need you all hung up on some stupid guy who probably never fucked you as good as I did and will in the future." He plants a kiss to your shoulder, being uncharacteristically sweet and affectionate.

You both lay there for a few more minutes before Sanzu pulls out and practically demands that the two of you go shower to rid yourselves of the filth of sex. He doesn't try to pull anything, genuinely just helping you clean up like a lover or older brother would, and helps you dry off afterwards too.

"Can I sleep here tonight? I miss when we'd have sleepovers." You give him big pleading eyes and cling onto his waist.

"Quit with the eyes already. You were going to stay the night whether you wanted to or not." He kisses your forehead and pulls away to grab you both something to wear to bed.

After your both dressed in pajamas, the two of you curl up in Sanzu's bed, tangling yourselves together in some sort of embrace. Having been the one to have gone through mental, emotional and physical exhaustions that day, you're the first one to fall asleep.

Sanzu just lays there for a while to just watch you sleep peacefully against his chest. He had to admit that he really always did have some sort of obsession over you, liking you far more than Senju and Takeomi ever did. Thankfully that worked out in his favor, if his siblings had cared about you even slightly more than they did, then you probably wouldn't have had to come to him for comfort.

Who knew all it'd take for you to finally become his, was just Sanzu "accidentally" finding out about your boyfriend and threatening him a little. Not that Sanzu would ever admit that he's the reason your coward of a boyfriend dumped you, you're his now and he's not gonna let anything change that, not even the knowledge of his past actions. He'd never admit to anyone either that his annoyed attitude toward you was only ever a lie, the only thing that ever actually annoyed him was that you'd seen him as a brother despite his own attraction to you.

"Good night, dream only if me~" He whispers, giving you one final kiss before closing his own eyes and falling asleep.

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