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."

Mania

He knew what was going to happen the minute Hinata closed his bedroom door. His parents weren't home so there wasn't any reason to take the time other than a force of habit. A habit Kageyama was regretting ever being part of forming –but was also excited beyond belief every time it occurs.

Both the "habit" and "it" of course being sex.

Because what else would a hyperactive, too much energy for his body, easily contended idiot of a shrimp enjoy more than volleyball?

Nothing. Nothing at all.

Small hands press on his shoulders pushing him down to the bed. Paying attention once more it really doesn't surprise him to find that Hinata decided to discard his clothes as quickly as possible, left in a muddled pile by the door. Hinata always loves when Kageyama lets him take over. And Kageyama isn't afraid to. Something flutters in his lower gut as he notices in the black cloth in Hinata's hands.

"Want it?" He asks with that same goofy smile he finds whenever they win a game.

He nods and finds himself in the world of darkness.

"On or off?" Hinata purrs as he fingers Kageyama's volleyball uniform. He knew Hinata loved how he looked in it.

"Leave the jersey."

"Really!" Hinata squealed already pulling off his shorts and underwear in one fell swoop with one hand and the other pushed him back at the same time so he laid on his bed with his legs still standing in the air. With control of his legs handed over to Hinata, Kageyama wasn't surprised to find that it barely took a second to feel soft nibbles trailing down his inner thighs.

He shivered.

"Like that?" Hinata teases before Kageyama feels something soft, wet, and warm –a tongue –work its way along the back of his balls and up, up, up to the tip of his cock.

"Uh!" Of course it wouldn't be without pain as Hinata pinches the flesh of his foreskin between his front teeth unsheathing him in a manner that causes a full body twitch –only to create more pain as Hinata continues to hold the flesh being jerked away.

Then the pain ceases…

Replacing it is returning of the soft, wet, and warm as it laps like a kitten all around his balls. First in an up-down motion as before for what seems like forever before switching to side-to-side. But never did the attention move above to his actual head.

This wasn't unusual. Hinata always seemed to have a strange fascination with his testicles and usually paid little attention to the rest of his body.

For a moment he's glad he can't see.

Hinata looking completely obsessed about one small part of his body as he tries to lick his way to the center of his cum-shoot.

Gulping Kageyama twitches his hands for just a moment. Then he remembers their rules.

Whoever is submitting is not allowed to move without guidance of the dominant –no exception. Use the safe word –not your hands.

So he fights his instinct to –touch, pull, grab –and keeps as still as possible.

Even if it means ignoring the fact that he can actually feel the semen moving around as Hinata finishes licking and now begins to suck the tender flesh harshly between the teeth. And what doesn't help even more so is the feeling of the semen going up and up, as pressure builds in his gut.

"Y-ye-yellow." He finally gives in, knowing all too well that Hinata hates it when his turn to dominate ends short. That and he doesn't want to pay the penalty for cutting their time short. Especially at the start of a long weekend.

He's cold then. Hinata has pulled away leaving vulnerable flesh wet and without his body heat.

In the distance he can faintly hear what is likely Hinata rummaging around looking for no doubt lube. And sure enough, with little warning –and likely planned that way –something cold, smooth, and wet –and completely different in a dozen other ways from Hinata's tongue –is poured onto the tip of his cock.

But rather than touch him or rub the slow-moving, still very cold, and gelatinous substance around he, Kageyama the "King", is left with his cock twitching around as consequence to the slow moving substance creating a sensation that is just begging him to touch.

Damn he hate it when Hinata dominated and made Kageyama depend on his very short temper of self-control to not move.

After forever Kageyama finally got a signal that his lover, Hinata, was still even in the room with him –the bed shifting. At first it was just a light shift over on his left side by his legs. Then another shift on the right side at roughly the same spot. Finally two small and cold hands rest on his upper chest, the tips of the fingers just brushing his collar bone.

"Ready?" Hinata whispers.

Fuck. He could already feel the smile from here.

He nods.

And then he's gone.

Hinata by this point is a pro at easing himself onto Kageyama –and he never likes to wait when he rides, rather Hinata like to let gravity take over the situation and drop himself all the way down.

"Hn!" Kageyama grunts feeling the bruising weight of the hundred-and-ten pound volleyball player crushing his pelvis bone.

The hands pressing on his chest scrunch in reaction to the drop and Hinata lets out a weak and mewling, "Ah!", before releasing him –both chest and penis as his lover becomes weightless floating above him.

Within seconds he drops again, only this time the hands don't scrunch but rather the nails bite into the thin flesh of his chest and the weight doesn't drop completely because within seconds Hinata is far away again. The pace is set. Seconds on, seconds off. Up and down. Bruising and scratching.

Yes and no.

Hinata and Kageyama.

"Ah!" and "Hn!"

It doesn't take long. Even in the darkness Hinata can still make him see stars as they cum in union.

"Ka-ka-gh!" Hinata mewls with some of, what Kageyama can only assume to be, drool dripping onto his chest. At exactly the same moment a warm liquid appears onto his chest slightly tickling as it dribbled down at a slowed pace.

He's no better of course as his hips shake for the first time since they started –pushing his cum further and further into the other boy –and practically ready to do it all again as he imagines his lover's face.

The two of them just lay there, only the silence and their heavy breathing and warm to keep themselves company. The warmth was especially temping as Kageyama found himself falling asleep. He barely even noticed when the warmth left.

Until it returned.

He knew he wasn't going to get any sleep. Not now, not tomorrow, not until the weekend was over.

Hinata was going to wring him dry.

And he wouldn't want it any other way.

AN: This is the end of Mania! Thank you everyone who has been reading for the last thirteen months I hope you enjoyed! Also considering how easily Hinata fell in love, and somewhat obsessed, with volleyball –I think sex isn't too far off!

Also I feel a lot of you thought Hinata was going to top… Sorry?

To me personally I think topping/bottoming and being dominant/submissive in bed are two different things –and far too often they're just lumped together.

Hence this piece.