Chapter Text
You live alone with your older brother, Tenko. Sometimes it’s weird living with him, he’s always having people come and go out of the small apartment you both live in. He often leaves at odd hours during the night, which he’s doing tonight. “I’ll be back shortly, I’m going out with Dabi. Dont fuckin call me unless it’s an emergency. Got it?”
“Yeah Tenko-nii.”
He ruffles up your hair, “Don’t stay up too late, okay?”
“Okay!”
You’re in the process of getting ready for bed, when someone knocks on the door. You get on your tiptoes, peering out the peephole, it’s this guy who your brother often hangs out with. Kai, you think his name is.
You open the door as wide as the door chain lets you, “H-Hi…Tenko’s not home.” You attempt to shut the door, but the man’s foot stops you.
“Did he tell you to say that?”
“Well…no… I mean sometimes, but he’s really not home.”
“_____? Right?” He waits for you to nod, “Please let me in? Please? ” Chisaki believes that you’re lying to him, and that Shigaraki is actually home. He only came here to collect some money for drugs that he fronted for your brother. He wants his money, and he wants it now.
You do not know a single thing about your brother’s drug problems or Chisaki’s involvement with the yakuza, maybe if you did you wouldn’t have let Chisaki in the apartment. “Okay, let me undo the lock.” You let him in and he walks right past you, “H-Hey…”
You watch as he goes into your brother’s room, “I told you he’s not home…”
“Where is he?”
You shrug, “H-He said that he and Dabi were hanging out…what do you want from him?”
Chisaki has never gotten a good look at you before, you seem so much smaller up close. How is something as beautiful as you related to someone so disgusting like Shigaraki? “Your brother owes me a lot of money…” He says as he starts creeping towards you.
You start to tremble, “I-I’m sorry, Kai…he's not here…Please believe me.”
He crouches down in front of you to reach your height, “I believe you, cutie. Why are you shaking so much?”
You try to avoid as much eye contact as you can with him, “I-I…”
He grabs your small hands, they’re so soft and smooth unlike his. “You’re so adorable…”
You feel your heart flutter, “R-Really?”
“How old are you again?”
“T-Twelve…”
He laughs softly, “You’re going to be a teenager soon, huh? You make me feel so old, shit.”
“How old are you?”
“Twenty-seven.”
You’re shocked, “You don’t look old…” Your brother looks even older than him and Tenko is only 21!
If Shigaraki won’t give Chisaki his fucking money, then he just decides he will take away what’s most precious to him, you. “Do you love your nii-chan?”
You smile, “Yes, of course.”
He gives you a smile back, “He owes me a lot of money, but I’m assuming he doesn’t have it…Would you be a good little sister for him and help him repay his debt to me?” He squeezes your hands tightly, “If you don’t he may get hurt.”
You feel your heart drop and your eyes shake with fear, “A-Anything…I don’t want him to get hurt!”
Such a flustered little thing you are, it’s adorable. Chisaki loves the redness in your face and the fear in those little eyes of yours. He can’t help but coo, “Aw, poor little darling. Why don’t we go to your room?”
Your room is surprisingly tidy, compared to Shigaraki’s filthy room. It’s so neat and organized, even your stuffed animals are lined up in an organized fashion on your bed. So darling, so cute, just like you are. “What do you want to do?” You ask nervously.
“Well, you’re going to do some things for me, remember? If you don’t, I’m going to kill that worthless piece of shit brother of yours.” Chisaki sits on the edge of your bed with his legs crossed, “Get naked.”
“What?”
He sighs loudly, “Are you deaf? Get…naked…now.”
You obey him and strip out of your pajamas and underwear, and stand in front of him completely naked. He has such a funny look in his eyes, it scares you…”Is this good, Kai?”
Your body is immaculate to him, he sees 0 imperfections in you. “Yes, you look really cute. Do you think I’m attractive?”
You stare down at the floor, face still very flushed…”Yes…” You sheepishly admit.
He gets up and grabs your chin, guiding you to look up at him. “Have you ever had sex before?”
“N-No…”
“Do you know what sex is?”
“Yeah…” You feel guilty for even admitting that. Small tears start to build up in the corner of your eyes once his hands move to your chest, but you stay quiet.
He gropes the small amount of fat, “You’re so small. Does it scare you that I’m so much older and bigger than you?”
“N-No…” You lie to him.
He runs his thumbs across your nipples, watching them erect, “Do you want to see just how big I am compared to you?”
“N-No…I can see how big you are already, Kai.”
He coos, “You’re so silly, ____! You know what I mean.”
“You mean…naked?”
Chisak grabs your hands and guides them to his belt buckle, “Do you want to see just how big I am compared to you?” He watches as your fingers fumble around with the loopholes of his belt, you stop and stare at him once you reach the zipper of his pants. “Go on, you don’t have to be so shy around me, ____! I really like you, I might go as far to say that I love you!”
You feel your heart flutter again, “Y-You love me?”
“Yeah! I can even be your boyfriend! Would you like that?”
“I-I’m not sure…”
Chisaki can tell you’re not buying the lie that he loves you, “Listen, you’re smarter than you look, baby. Why don’t I give you a couple options? You have sex with me and be my little girlfriend…or I’m sure you’ll hate this one, I’ll kill your brother?”
Your hands tremble as you start to pull down his zipper, “I-I’ll be your girlfriend and have sex with you…just pleasure don’t hurt Tenko-nii.”
He licks his lips as he watches you pull out his cock, it’s twitching in your hand, “Wow, do you see how small you are compared to me? It’s so hot!” Your fingers can hardly wrap around his girth, “Will you call me Kai-nii?” Shigaraki doesn’t deserve to have a cute little sister like you at all…
You don’t want to, but you do. “Kai-nii…”
He moans by you saying that, “Do you want to suck on it? I want you so bad, ____.”
You feel his thing throbbing so much, “You do?”
He laughs softly, “Yes, my cock has been hard…it hurts so bad.”
You get down on your knees, your eyes shut tight, and you put it in your mouth.
“Come on, keep going.” His hand guides your head down his shaft until he hears you gag, “Look up at me, let me see those pretty eyes.” Even though your eyes are puffy from tears and so sad looking, it’s still very adorable to Chisaki.
You’re not sure if you’re even doing this right, all you’re doing is moving your head back and forth, sucking, and moving your tongue around. Kai keeps making funny noises, so maybe you’re doing it right…he tugs on your hair, “S-Stop!”
You pull your mouth off, “D-Did I do something wrong K-Kai-nii?”
He shakes his head as he kicks his shoes off, “Get on your bed.” He was so close to cumming, “It felt amazing, fuck…” He’s not sure why he made you stop, he’s actually annoyed at himself for stopping you.
You lay on the bed, staring up at the ceiling as you hear his clothes rustle around…You know what he’s going to do to you…He gets on top of you, and looks directly down at you, you shut your eyes. You feel his lips press directly onto yours and you gasp, that’s when his tongue slides into your mouth. It feels icky…his tongue…everything feels gross. You feel him poking into your sex with his cock. He pulls his lips off of yours, “Going to fuck you now, okay?”
You nod, eyes still shut tight.
Your pussy is so tight, but it feels so slick. “F-Fuck, you’re so small and I’m so big…H-How does that make you feel?” He can feel your plush walls grip tightly around his cock once he’s fully stuffed inside.
Tears trickle down your face, “I-It hurts…” you cry softly, trying your best not to shout. He is big…so big it hurts bad.…
Even Chisaki feels pain from how small your pussy is, but it feels fascinating to him. You look so pretty struggling to keep it together as his cock abuses your insides, “You make me feel so good, ____! Maybe you should come live with me!”
“No—Kai-nii…” You’re seeing spots in your vision, so you clench your eyes shut….wondering how long this will last? “Kai-nii!” You cry loudly, no longer able to conceal your sobs.
Your high pitched cries make his cock twitch so much, “Keep crying, help your nii-chan cum!!”
“Kai-nii!” You sob uncontrollably, pleasing him further.
He fills your small pussy up to the brim with his thick warm seed, “Fuck me-“ He gasps. He pulls out and gets dressed, “Poor little baby sister, you can blame Tenko for what happened to you.”
You pull a blanket over yourself, still crying. “A-Are you leaving now?”
He sits beside you, petting your hair and humming. Maybe he should leave, so he can avoid confrontation… “No, I think your worthless brother needs to see what happens if he doesn’t pay me back.”