From- My Haikyuu Oneshots Book
Demon!Oikawa au (+soft Iwazumi)
Type- Fluff / smutt
⚠️Cussing, someone being seduced(?), crying but not for a long time, talk of bl**d at one point but not a lot, smutt⚠️
*Top-Iwa    
*Bottom-Oikawa
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It was Oikawa's 18th birthday today and he was NOT ready for what was to come at midnight.

All through out the day he partied with his friends. Not extreme parting, more like they all made a MASSIVE pillow fort and bendge watched Disney movies all day, starting with Wall-E and then everything random after that.

Now that it was ten thirty at night everyone but Iwazumi had gone back to their own homes.

"Iwa-chan as much as I love you staying the night, I think you might want to go home tonight." Oikawa said trying his best to not let any of his nerves show.

"Why? What's wrong?" Iwazumi asked instantly noticing his best friend's nerves.

"What? Nothings wrong, it's just that..." Oikawa quickly attempted to come up with a reason why Iwazumi couldn't stay over but took too long.

"What. Is. Wrong?" Iwazumi asked again, this time pulling Oikawa down to sit on the bed beside of him.

"I-" Oikawa looked away from Iwa and instead moved his gaze down to the floor.

"You know you can talk to me about anything right?" Iwazumi asked, cringing internally at how cheezy that sounded.

"You won't believe me." Oikawa finally said keeping his gaze glued to the floor.

"Yes I will. Toru, I know you and I know that if your acting like this then it's either something serious or some shitty prank of yours." Iwazumi replied, Oikawa's eyes snapping to his when he said his first name.

"This isn't a prank.... I am coming to my demon inheritance tonight and I dont really know what is going to happen." Oikawa said as he looked into Iwazumi's green eyes. (A/n. Before the comments say "oh but he has brown eyes, no he doesn't in the Manga so we are going with that here.)

Iwazumi looked at him confused.

"Demon inheritance? What?" He asked making Oikawa look away from him again.

"I told you, you wouldn't believe me." Oikawa pouted as he crossed his arms across his chest.

"I- well... um." Iwazumi attempted to think of something that would make Oikawa feel better but in all honstly, he didn't believe the boy at all.

"Its fine. You will believe me in *he looked at the clock* five minutes." He finnished seeing that it was already eleven fifty-five.

"Whatever you say. How about we watch one of our old matches while we wait?" Iwazumi asked as he pulled out the disk from his bag.

"Fine but we won't get through most of it." Oikawa agreed as Iwazumi put the DVD into the DVD player.

***5 Minutes Later***

Oikawa suddenly let out a cry of pain as he colapsed back onto the bed, his back arching off of the bed as tears fell down his face.

"What the fuck? What is happening?" Iwazumi asked in a panic as he watched his friend cry on the bed.

"D-demon inher-" Oikawa cut himself off by passing out from the pain.

Iwazumi sat there confused as Hell.
One second Oikawa was fine sitting beside of him, watching the old game and the next he was crying out in pain.

Suddenly two large black wings came from Oikawa's back along with two shirt black horns came from his head.

His clothes changed as well as if magic...



(Just add large black wings to this^)

Iwazumi looked at him bewildered. "What the actual fuck?" He thought aloud.

Suddenly Oikawa sat up fully, now awake.

Right once he saw Iwazumi his eyes turned dark red.

Iwa's eyes widened in fear as he stood up and ran to the door.

Before he could reach the door however he was pinned against a wall.

"Iwa-chan~ where are you trying to go?" Oikawa purred into Iwazumi's ear making the slightly shorter boy shutter.

"Bathroom?" Iwazumi replied, his voice mostly giving up on him.

"A-are you scared of me?" Oikawa asked as he stepped away from Iwazumi, his arms wrapping around his torso as he looked hurt at him, his eyes tearing up.

"What? No I'm not scared of you. Why would I be scared of you?" Iwazumi asked as he moved closer to Oikawa, instantly trying to comfort the boy.

"R-really?" Oikawa asked as he watched Iwazumi walk over to him.

"Really. In all honsty you don't look scarry you look..." his voice trailed off as a blush rose to his cheeks.

"Aww~ Iwa~ do you think I'm hot?" Oikawa asked as if flipping a switch on his emotions.

Iwazumi was slightly alarmed at how quickly Oikawa switched from almost crying to flirty but didn't think too much about it considering he knew quite a few people that could do that.

When Iwazumi didn't reply Oikawa smirked before grabbing the shorter boy's wrist and pulling him closer.

"You don't have to be shy Iwa~ I know I look hot as Hell." Oikawa laughed at his own joke as Iwazumi looked at him confused before growing a smirk of his own.

"I, am not shy. I didn't want to make you uncomfortable." He replied as he switched his hands so he was now holding both of Oikawa's wrists.

"Nothing you could do would make me uncomfortable love~." Oikawa purred making Iwazumi freez for a second.

Oikawa took this as an opportunity to shove him down onto the bed so he was now strattling Iwazumi's waist.

Iwazumi snapped out of his shocked state quickly as he looked up at Oikawa's darker red eyes. This time they looked dark with... lust?

"Oh no." Iwa said before flipping them so he was now on top. "I'm not a bottom." He stated as Oikawa smirked at him.

"Fine by me." Oikawa said before pulling Iwazumi by the back of his neck into a kiss.

After a second of thinking what he had just done, he started to pull back and appoligise only to have Iwazumi start to kiss back.

Iwa deepened the kiss as he slid his toung across Oikawa's bottom lip.

Oikawa gasped in shock allowing Iwazumi to slip his toung between the demon's lips and explore every nook and crevice of the hot cavern.

"Be my boyfriend?" Oikawa asked once they pulled out of the kiss.

"Gladly." Iwazumi replied before pulling Oikawa into another kiss, this one much more heated and lust filled.

Oikawa flipped them again and placed himself in Iwazumi's lap as he pulled Iwa up so he was now sitting up, never once breaking the kiss.

He started to grind his hips against Iwazumi's making them both moan at the sudden friction.

Oikawa's wings wrapped around them both, Iwazumi's hand accidentally brushing against one of them making Oikawa shudder in pleasure.

"Do that again." He breathed when they paused their kiss, yet he didn't stop moving his hips.

"Do what again?" Iwazumi asked confused before he started to kiss up Oikawa's neck and jaw, leaving the occasional hickey.

"W-wings." Oikawa replied making Iwazumi nod before bringing one of his hands up to stroke the wing.

Oikawa moaned loudly at the feeling as his hips sped up and he barried his face into Iwazumi's neck.

Iwazumi moaned as Oikawa bit into his neck leaving a mark, drawing a little blood.

"W-what was that?" Iwazumi asked as he moved his other hand up to stroke Oikawa's other wing.

"T-tempary mate mark~." Oikawa moaned out as a he felt himself get close to his climax.

"I-I'm close." He warned, Iwazumi now moving his along with his own.

"Me too." Iwa groaned out before pulling Oikawa into another kiss.

The kiss was hot, heavy, and slightly messy but neither minded at all.

When they pulled away from the kiss Iwazumi moved both of his hands through Oikawa's wings at the same time making the latter shake.

"Hajime~." He moaned loudly as he came, Iwazumi cumming almost immediately after with a low grunt.

Oikawa rolled his hips forward a few more times as they both claimed down from their highs.

"We need a shower and new clothes." Oikawa stated noticing that neither of them had taken their clothes off the entire time.

"Yeah we do, these pants probably need to be burned now." Iwazumi agreed as Oikawa go off of his lap.

Oikawa laughed lightly at Iwazumi's statement before grabbing a pair of clean sweatpants and one of Iwazumi's hoodies before leaving for the bathroom.

Iwazumi quickly grabbed himself a pair of clean sweatpants before following Oikawa into the bathroom.

They both took a shower together, nothing more than kissing happening between them while they were in there.

Once they were done with the shower, dry, and clothed they walked back into Iwazumi's bedroom.

They quickly cleaned everything up and turned the TV off before collapsing onto the bed.

"So your a demon?" Iwazumi said more as a rhetorical question than a real one.

"Yep." Oikawa said popping the 'p' as he cuddled up to Iwazumi's chest.

"Cool." Iwazumi said as he ran a hand through Oikawa's hair.

Oikawa hummed in reply as he was already mostly asleep.

"Goodnight love." Oikawa said before falling asleep.

"Goodnight babykawa." Iwazumi replied quietly before falling asleep himself.
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1,569 Words!