"Y/n," he says, rubbing your back.You mutter words under your breath before waking up. You lift yourself off his chest and sit back, to the point you're straddling his waist. Your vision is still blurred, and he speaks again to gain your attention. "You're not going to say good morning back?" he asks, his hands placed at each side of your hips. His thumbs roll back and forth against your skin, causing you to look at him tiredly and smile.
"Hi."
He laughs at your attempt and lifts himself up to plant a kiss on your lips. His kiss trails down to your chin, to your neck, and you give him full access. He comes back up to your lips and slides his hand into your hair, bunching it up into his fist, earning that tired groan he wanted. His hand falls back to your hips, and you open your eyes to look at him.
"As nice as this is, I really need to be going," he says quietly before placing another kiss against you. You hum into it to tell him you understand. You roll off him and get up from the bed. He watches you stand up and stretch yourself. You then grab your robe and tie it on your waist loosely.
"Black really suits you," he says, loving how your underwear clings to you. You chuckle while finishing the knot. "Well, what's your favorite color?" you ask.
"Blue."
"I'll make sure to wear that next time then~"
You head into the bathroom, leaving Iwaizumi alone on your bed. He sits up and lets out a sigh. His mind ponders how he acted just now and yesterday. He places his two hands on his face, covering his embarrassment. Why did he even have sex with you in the first place? Isn't this the first time he met you in how many years? And even still, he really only knew little about you, other than the fact you're Oikawa's sister and how he'd see you when he came over to Oikawa's house when he was younger, or at trainings.
Small memories of you two flood his head. He remembers you greeting them at the door, or when you sometimes picked them up from school. Or how he started to wear tank tops because you would wear them around the house and he thought you looked cool. Or how he would correct Oikawa in front of you to make himself look good. He remembers how cute you were when he made you laugh for the first time because of it.
Wait.
Cute?
He slaps his face a few times before holding his hands together. Okay, so maybe he did always like you a little. But surely that's not enough for him to have sex with you after ten years of no communication. He was also confused with why you were so okay with this. You don't seem worried if your brother found out or the fact you guys just met. Maybe he's overthinking this too much. I mean, if you're fine with it, it should be okay.
He stays lost in thought until he hears the front door opening. He quickly puts on his shirt and heads down before Oikawa notices. "Stop, she's literally upstairs," an unknown voice giggles out. "It's too late to be embarrassed now, you know," Oikawa coos back. All of Iwaizumi's heartfelt thoughts went in the bin, and a wave of disgust falls over him. The way he saw his friend acting was honestly an ick to him.
"So this was your emergency?" he sarcastically asks. Oikawa jumps off the girl with him and looks at Iwaizumi. "What th—why are you here?" he quickly says. "Your sister?" Oikawa pauses before realizing. She glances at Oikawa before clearing her throat. "Are you dating Y/n?" she asks. He feels himself become stiff, but Oikawa replies quickly. "No, I asked him to stay with her 'cause she drank last night."
"She drank? Is she okay?" She says, concerned. She heads up to your room. Oikawa and Iwaizumi look at each other before Iwa scolds him for leaving like that. She makes it to your room, and you step out of the bathroom in your robe. You just finished having a shower and look at her weirdly. "You okay there, King?" You ask. She comes closer to you and holds you by the hands. "I should be asking you that", King responds back.

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𝙏𝙊𝙐𝘾𝙃𝙀𝙎 𝘼𝙉𝘿 𝙏𝙀𝘼𝙎𝙀𝙎 (𝙄𝙒𝘼𝙄𝙕𝙐𝙈𝙄 𝙓 𝙍𝙀𝘼𝘿𝙀𝙍) 18+
FanfictionThis story does contain smut. Your younger brother's best friend. His best friend's older sister. Everyone else's hate and jealously. What could possibly go wrong? Ah yes, probably everything. Oikawa Y/n, older sister of Oikawa Toru. You moved to L...