Matsukawa and Hanamaki getting taken aback bc “WAIT WE THOUGHT YOU WERE GAY FOR OUR CAPTAIN THERE’S NO WAY WE’VE BEEN IMAGINING ALL THAT ROMANTIC AND SEXUAL TENSION FOR THREE WHOLE YEARS?? AND WHAT DO YOU MEAN ‘FRIEND’, LIKE HELL YOU DON’T HAVE SOMETHING GOING ON WITH KARASUNO’S MANAGER JUST LOOK AT HER??”
Then they glance at Oikawa who is so obviously unhappy and his arms are crossed and he’s doing that thing where he hmphs and sticks his nose up when Iwa brightens at someone who’s not him, to which they’re both thinking “ahhh okay but Oikawa is definitely gay for you”.
The whole time, Kiyoko would of course feel most comfortable talking to Iwaizumi and I guess least with Oikawa (since he was even ignored by her in canon lmao), though she’ll respond to Matsukawa and Hanamaki if they ask her something. Also whether he realizes it or not, most of Iwaizumi’s attention is on her too anyway.
Meanwhile, Oikawa is peeved with how well they’ve come to know each other in such a short amount of time (Iwa and Kiyoko are constantly saying “I remembered you said you liked this/that,” or “Oh yeah, I thought of you when I saw this,”). Then you’ve got Hanamaki and Matsukawa, who want to make teasing comments at Iwaizumi about his apparent crush, but at the same time they had been kinda waiting for Iwaizumi and Oikawa to get together, and they figure their captain is plenty hurt atm so they mostly occupy themselves with joking around about other things instead and trying to lift his mood.
Come the end of the day, Iwaizumi walks Kiyoko home while the other three go in the opposite direction. However, ten minutes after they part, Oikawa is calling out to them from behind, and he’s insisting to come along too bc ”Knowing you, Iwa-chan, you’ll get lost on the way back home!” (Iwaizumi is too tired to argue and relents.) It’s a quiet walk with Iwaizumi occasionally making comments to Kiyoko about their day.
When she’s close to her home they finally part ways, and that’s when Oikawa starts walking so close to Iwa that he’s p much pushing the guy (”Cut it out, dumbass, we’ve got the whole sidewalk to ourselves.”). At that, Oikawa does the opposite and drapes himself over Iwa’s side causing them both to stop and before Iwaizumi can ask what he’s doing, Oikawa speaks up first but it’s muffled bc his mouth is pressed against Iwa’s shoulders. It tickles and Iwaizumi hopes Oikawa doesn’t feel the shudder that runs through his body aaand I’m just gonna stop there bc this is longer than I had intended ahah;;;