Haikyuu Oneshots & Headcanons

The Best Friend's Sister || I.H. [hc]

A/N: I FINALLY GOT TO WRITE FOR IWAIZUMI I LOVE HIM SM AND THIS DYNAMIC I LOVE IT

Request: can I request Iwaizumi dating the manager and Oikawa's younger sister

Character pairings: Iwaizumi Hajime x Oikawa!reader (Older brother!Oikawa x Younger Sister! Reader)

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- You would have so much fun with them

- But they would also be very protective

- You would've known Iwaizumi since you were small and growing up he probably always blushed a little when he was around you, but you wouldn't notice it

- He's a stubborn but dorky guy.

- High school comes along and Oikawa just knEw that Iwa liked you and encouraged him to say something because Oikawa knows you as well

- And his encouragements became a little pushier each time, it probably resulted in Oikawa saying "if you don't tell her by next week, I will"

- Oikawa and Iwa have their fans, and well so do you, especially as you're an Oikawa

- So Oikawa sees the hints of jealousy in both of you when people attempt their little love confessions to either one of you

- I feel like a Oikawa or Iwa would sometimes overhear someone mentioning they're going to confess to you and they're both just like "don't."

- A menacing aura and they get the message across

- (although to be fair some people would take one look at you with the seijoh third years and some of them dEfinitely back out of confessing to you before they knew)

- Tooru just wants to cut the tension and longing stares between you and Iwa, okay?

- He's had to deal with them for a long time

- He also knows Iwaizumi would be such a sweetheart to you and wants to see you both happy

- Iwaizumi at first found it confusing that Oikawa was encouraging it because well, weren't older brothers meant to keep their little sister's away from relationships?

- Oikawa states that he will still baby you but he loves you and knows that Iwaizumi is good, and who else is better to date his little sister than their best friend

- Once you two are together he probably regrets it because you both tend to call him names and partake in some friendly/sibling bullying

- You'd call Iwaizumi Iwa-Chan as well and he'd accept it because he likes you more than your brother

- Makki and Matsun would be so much fun as well, Oikawa and Iwa know they won't try anything with you and trust them anyway so you're basically a third year at this point

- Seijoh thirds years and you would be chaotic - I'd suggest keeping you away from the first years but you're all on a team together so that's not happening

- The team lOves you as their manager and Iwaizumi especially loves it because it means you get to go to all of their games

- I feel like Iwaizumi wouldn't be very comfortable with PDA in front of his whole team, so before games it's hand squeezes unless you can find a few seconds of alone time for a kiss

- He was probably really stiff with you around Oikawa when you first started dating, because while Oikawa encouraged you two to confess, you were both weary about his reaction to actually seeing you two act couple-y - more so than you used to as best friends anyway

- HUGS FROM IWAIZUMI.

- That's it. That's the tweet.

- His big arms just wrapped around you and holding you, I'm sure we all need that.

- They'd be so comforting and warm and you'd just rest your head on his big chest.

- It would be heavenly

- During matches and practices you'd always get him a towel and water bottle first and Oikawa is jealous, well so is half the team but still

- To spite the rest of the team, go give the first years a towel and bottle after Iwa.

- The first years love you a lot as well

- During matches, once he's successfully scored them a point, he'll just beam at you with the biggest, cutest smile and he'll smile even wider when he sees you cheering for him

- His eyes will also search for yours when they fail an attack to gain a little reassurance from you

- Once he's grown more comfortable around you and the team, despite how much time he spends being a good senpai, he will sometimes just walk over to you at the end of a match or a practice and lean his head on you and wrap his arms around you

- You're his happy place, the one person he feels the most relaxed with

- So he will take many moments to just be able to hold you

- Oh my god when Seijoh lose their match against Karasuno

- Everything you've all worked so hard for, over in such a short space of time

- Just be there for him. For all of them. Let them cry with you. Hold Iwaizumi (and Oikawa too)

- Because everything they worked for wasn't a waste, they may have not made it to nationals, but if you know the time skip, then you know how far they make it with their respective jobs

- Moving away from the sadness, Watch Godzilla with him!

- Even if it's not one of your favourites, how happy and invested he is when he watches it is worth it

- So no getting out of it, he's a sweetheart and will usually let you pick what to watch and he'll watch whatever you like as long as you sometimes agree to watch the movies he likes

- Falling asleep together covered in blankets with movies playing in the background, the good life.

- He'd be so so sweet and support him through everything and he'll do the same for you.