There’s a time when they were in college, just moved out into their own apartment, when Tooru tried to act sexy and seduce Iwaizumi.
It didn’t work, mostly because Iwaizumi was confused at what Oikawa was trying to do for a good five minutes until he had to laugh at the realization. He took Oikawa’s hand and tugged him close, looking up at him as he brushed his thumb against the back of that hand. Oikawa’s face was scrunched into a pout, decidedly looking to the side, as Iwaizumi asked, “Was that supposed to be sexy?”
A flush seeped through the pale skin along Oikawa’s neck, and Iwaizumi warmed to the idea that he was too embarrassed to retort.
Iwaizumi stood from the couch, wounding an arm to the small of Oikawa’s back, and leaned in until his breath brushed against his neck. He whispered, “Let me teach you ‘sexy’.”
He nipped right under Oikawa’s jaw and jerked him close, pressing their bodies together and sliding another hand down the outline of Oikawa’s body. He felt him still against him and smiled, a hint of a smirk in those curled lips. Iwaizumi spun them around to dump Oikawa into his seat and leafed his fingers through that soft, soft hair. “Watch me,” he said, a challenge in his voice and a quick flick of his chin, and stripped off his shirt from the bottom up.
[Then Tooru was seduced and frustrated and angry and so turned on.]
After that, Iwaizumi picked up a habit of whispering, “You’re sexy,” into Oikawa’s ear at times. It wasn’t that Oikawa wasn’t sexy at that time; it just wasn’t Iwaizumi’s “Tooru-sexy”. Because “Tooru-sexy” was when Oikawa’s sleepily cooking breakfast in just his boxers and a loose T-shirt, and Iwaizumi can go up and hug him from behind to whisper into his ear just how disastrous his hair looks.
“Tooru-sexy” was when Oikawa’s just gotten out of the shower when Iwaizumi comes home, sitting at the couch with some trivial TV show flickering across the screen as he unconsciously nursed at his lips, the warm scent of soap floating in the room.
“Tooru-sexy” was when Oikawa’s tired from a day of work, said, “I’m home,” softly and didn’t even hear Iwaizumi welcome him back, because all he wanted was to hop in the shower and feel clean again.
Tooru doesn’t believe him when he tells him, and Iwaizumi isn’t about to argue with him on it any time soon, because it’s also sexy when he scrunches his face, eyes in slits because he’s pouting but wants it to be a glare, and just asking for Iwaizumi to tease him more.