#i guess his muscles just be too popping 🤷‍♀️

[seiwas]

for writing game, iwaizumi + assistance <3

hope this sparks some inspo and thank you in advancee

hi there!! thanks for sending in a prompt 🫶

contains: friends to lovers (ish), halloween parties, reader is dressed as catwoman, expletives, iwaizumi is thiiiiis 🤏 close to murdering seijoh4 (jk)

iwaizumi + assistance

this is a set-up.

iwaizumi knows he shouldn't have fucking believed anything the boys "promised" him back when they assigned him this costume.

the suit is fucking tight, spandex digging into his groins and all other crevices that definitely should be aired out after after a few hours. he's had to constantly readjust his stance almost every few minutes, the black fabric compressing his thighs and torso, significantly constricting the range of motion his shoulders and arms are typically used to. if anything else, it could double up as a back brace from how rigidly straight it's kept his posture all night.

he'll give it to makki though; he did outdo himself sourcing this year's costumes―this batman set looks pretty damn legit.

except for one tiny problem.

there's no fucking pee hole. it's a zip-up, zip-down one-piece situation. and that normally wouldn't be a problem, except that oikawa "accidentally" knocked over a cocktail straight into his pants, the sickeningly sweet liquid now seeping straight into the fabric and past his boxers―cold and sticky as it touches his skin.

and so, the problem: his pants are wet, it makes him want to fucking pee, and coincidentally, the only vacant bathroom is across the hall, at your apartment.

this is why he believes this is a set up. that, and the fact that you're dressed in an outfit strikingly similar―just with cat ears.

he's been asked five times in this party if you're in matching couple outfits.

it catches him off guard, flusters him because of how badly he wants to say yes. but, you're just friends, and he doesn't even think you like him that way (despite mattsun and oikawa practically begging him to confess. makki tells him he thinks you're going to do it first).

so he politely smiles and says no, but you look good, your costume clinging to you in all the right places. thank fucking god he has a cape because he's pretty sure he spent the first 30 minutes in the party hiding his boner.

"hajime, it's fine, i swear," you stand beside him in front of the conveniently locked bathroom in oikawa's apartment. from the other side of the door, he's pretty sure he hears mattsun and his girlfriend mumbling. maybe fucking? who knows. "you can just use the bathroom in my apartment."

he glances at you before closing his eyes, contemplating, before finally agreeing to you.

"okay."

if he's being honest with himself, friends is definitely an incomplete label to what you are. as oikawa's neighbor, you are conveniently around all the time; and oikawa being oikawa, the ever-social butterfly, he's somehow managed to carve a space for you in the friend group.

(never mind the fact that oikawa's sniffed him out from the moment he first introduced you.)

you were a crush, then a friend, and now you're someone he picks up from work and drives back home three times a week, because he "has to train oikawa." you don't question it, even when you both know he stays over for dinner way past the gym's open hours.

"you know where it is," you open your apartment and urge him in.

"sorry again," he turns to face you.

"yeah, yeah, just pee!" you laugh, shoving him towards the bathroom door.

getting out of the suit is manageable, and he's able to wipe off a bit of the cocktail that's leaked to the suit and his boxers just to make sure it isn't gross and sticky when he gets home later. peeing is a big relief once he gets it over with, but it's when he has to suit up again that things become difficult.

stretching out the spandex one body part at a time is a workout in itself―the hardest task being when he has to pull it over his shoulders, adjusting it to fit properly over his arms and chest.

but then the zipper breaks.

and he truly thinks makki has fucked him over.

iwaizumi contemplates what to do next for a good, good while. he tries calling oikawa, only to no success every time; no way in hell is he calling mattsun in the middle of having sex. and calling makki isn't even an option; he'd never hear the end of it.

then you knock on the door, your voice soft and concerned as you ask, "hajime? you good in there?" you hit it spot on, too, "do you need help with your suit?"

iwaizumi presses his palms to his eyes. he's a rational man, straightforward and logical in thinking. there is literally no other option for him right now but to ask help from you. again.

fuck.

.

it's 30 minutes later when oikawa barges in your door, and the sight that greets him is iwaizumi in nothing but a hoodie (the hoodie you borrowed some time ago) and his boxers, with his hands on your waist as you hover your hairdryer over the crotch of his batman costume―cat headpiece off and all.

"you finally got together?!"