Summary: This is their mania –their obsession, their enthusiasm, their craving. Nothing and no one can stop them, not even themselves. Not that they really want to stop, that is. Warnings: Kageyama/Hinata, kink, masturbation.

Disclaimer: I do not own Haikyuu. I'm still fairly inexperienced when it comes to dealing with Haikyuu.

"Mania"

Defined as "an excessive enthusiasm or desire; an obsession", synonyms for include: "obsession, compulsion, fixation, fetish, fascination, preoccupation, infatuation, passion, enthusiasm, desire, urge, and craving."

Preoccupation

"Hello? Hello? Hey! –Anyone in there? Hell-ooo?" Tanaka asks waving his hands in front of "the king" for the fifth time this practice alone.

"Don't bother", Tsukishima mutters arms crossed as he watches Hinata and Nishinoya go at it under the guidance of Suwamura and Sugawara.

"Why?"

An eye roll is all he gets in return before Tsukishima walks off.

"Hey! You disrespectful little…" Tanaka grits his teeth in annoyance. Turning back he can see Kageyama with a dazed look staring at the last practice group of the evening. So weird. Everything about the so call "king" is weird. Whatever. Not his problem.

Walking off Tanaka grabs his water battle, 'Fuck its empty', and heads off for the water fountain. By the time he returns from the uneventful tasks he finds the king exactly as he left him. Whatever. Still not his problem.

Two minutes go by as most of the rest of the team has put away the equipment and are just waiting on the captain to finish up and debrief them.

So another five minutes go by and finally Hinata and Nishinoya are done and the team is in a huddle. Well most of the team. That damn king is still of in la-la-land doing who knows what. But what-ever, not his problem. Tanaka knows what the schedule is for next week and is pumped for the next game. Time to go and get some rest and be done for the night, and forget homework all he wants to do is take a nap.

The king still has not moved from his spot.

Even after he has grabbed his things and most of the team has already left for the night that damn first year is still standing there doing nothin' –absolutely nothing!

"Hey!" he shouts immediately regretting the fact he does at some level care for the smug bastard, at least more so than Tsukishima.

But he's ignored. Again. No big surprise he guesses. So he turns around and calls it a night. No one else has questioned the kid's weird behavior tonight so why should he give any more of a fuck then any of them.

He gets to the door. The fucking door, when that little sempai inside of him says he should at least make sure the kid heads home, and he turns around –only to see Hinata and Kageyama making out at the other end of the gym. He's too far away un-no-totally-fortunately to see or actually hear much of the action going on but he's pretty sure that those are Kageyama's hands on Hinata's dark shorts grabbing his –nope!

It takes him probably five seconds to realize he is already half way home that is how fucking fast he is in getting away from that smutty goodness.

Smutty goodness? What the actual fuck is wrong with him.

No. What the fuck is going on with Hinata and Kageyama! Is that why the king was staring at the last group earlier? Because from his position he could clearly see Hinata's round little ass! Round little what?

"Fuck! Fuck, fuck, fuck…"

Tanaka curses himself the whole way home, gets no sleep, and from the next morning on –never questions the "kings" preoccupation with Hinata's ass.

AN: Mania is a series inspired by Haikyuu including several pairings, inspired by a request from my personal friend for her birthday! None of the stories in Mania have to do with one another and will be uploaded as one-shots. So read in any order you of your choice!

When I started this I did not realized that more so than discussing Kageyama's ability to be completely preoccupied with Hinata I wanted to get into the head of Tanaka, who I am pretty sure curses a ton in his mind just based off his facial expressions throughout the manga.

Hope you enjoyed! I have midterms tomorrow~