Game of the Insane (Yandere Haikyuu!! x F!Reader Oneshots)

CHANGE PART 3 (Oikawa Tooru)

Title: Change (Part 3)

Pairings: Oikawa Tooru x Reader

WARNINGS: Yandere themes, swearing, violence

Summary: After returning to the way you'd always been, Oikawa's become nothing short of a nightmare.

change

/verb/

make (someone or something) different; alter or modify:

Oikawa never thought he'd have to compete with anyone, much less the guy he was seeing. He was a two out of ten, whereas Oikawa was a ten through and through.

Messy brown hair, thick glasses, a face riddled with acne... The guy gave a toothy smile, revealing braces. And, worse, you gave him a smile back.

Oikawa hadn't seen you smile in two or three months now. Believe him, he'd tried. His jokes left you blank-faced, his cuddling left you tearful (maybe physical touch wasn't your love language) and his gentle affections made you shrink away or flinch.

For a minute, Oikawa stood there dumbfounded, holding a coffee in each hand, silently admiring your smile, even if it wasn't for him. The next minute, he was at your side, standing between you and the boy that dared to talk to you.

"Sweetheart," Oikawa put every ounce of affection he had into the word and sent a threatening look towards the nerdy-looking male, "Who is this?"

"His name is Hikaru," you said. You stood up and gave your "boyfriend" a challenging look, "We were just talking."

Oikawa shoved down the green-eyed monster rearing its ugly head and offered the stranger a friendly smile, "I see you've met my girlfriend."

"We aren't dating," you snapped. You were talking more now than you had talked in months, and this was what you were saying? How disappointing... No, insulting.

"My princess likes to joke," Oikawa said, letting out a carefree chuckle, "Now..." He turned his face so only the two-out-of-ten could see. His smile morphed into a sneer and his eyes narrowed, dark with anger.

"Goodbye."

Hikaru held Oikawa's stare for a few seconds before crumbling. "I'll see you later, (Y/n)."

"See you later," you said softly, disappointment lacing your tone.

Oikawa frowned deeply at that disappointment. You never sounded disappointed when he left. You were always so relieved...

He pushed your coffee closer to you as he took a seat at your shared table, "It's just how you like it."

"How do you know how I like my coffee?" you asked, looking up at him with suspicion.

Oikawa ignored your question, "I don't like when you talk to other boys."

"And I don't give a fuck what you think," you snapped.

It's her time of month, Oikawa decided. Usually you were much meeker. Now, even your glasses flashed with anger. He reached out to play with your messy hair and you swatted his hand away. So feisty. This was a new side of you and hell if he wasn't enjoying it.

His eyes gleamed with excitement. High off the adrenaline of scaring away a potential rival, he reached out and grabbed your hand. When you pulled away, he tightened his grip.

He laced his fingers with yours, smiling softly when he compared how much smaller your hands were than his. You were his. Not Hikaru's. In time, you would come to understand that.

—---------------------------------

Your mother had fallen for Oikawa's charms, always saying things like "you don't have to be embarrassed that you're dating" whenever you denied him being your boyfriend.

So, when Saturday rolled around, and he appeared at your door, knocking on it like he always did, he wasn't surprised by your mother opening it with a smile.

"Did she forget something?" your mother asked.

Oikawa furrowed his eyebrows in confusion, "What do you mean?"

"I thought she was out with you," your mother said, equally confused.

Oikawa's heart sank. If you were out of the house, either you left alone to avoid him or the worst case scenario was unfolding. The possibility that you were out with...

No. There was no way. He had scared that little nerd away, intimidated the shit out of him.

Despite his thoughts, he had already broken into a run. You could be anywhere, sure, but Oikawa knew where you would be. With your new "attitude", you'd be exactly where he looked first.

He burst into the cafe so violently that people stared. His eyes zeroed in on the couple at a table near the back. Your pretty, bespectacled face looked up at him with a knowing smile. Oikawa doesn't need to be a genius to guess who the messy-haired boy sitting across from you was.

He walked back out the door, seething. He needed to get rid of this pest and teach you a little lesson about hanging out with other men.

—--------------------

"Oikawa, STOP!" you screamed.

Oikawa had gone temporarily deaf, his knuckles bruised and reddened with blood. He continued to slam his fists into Hikaru's face.

Hikaru was unconscious at this point, which was probably a blessing. That way, he couldn't feel his nose breaking with a loud SNAP.

You threw yourself on Oikawa, trying to wrestle him away from the poor boy, but he shrugged you off like you were a pesky mosquito. Tears ran down your cheeks as you begged him to stop caving in your friend's face.

"Tell me you made a mistake or I'll kill him," Oikawa stared down at you with a terrifyingly blank expression, cheeks speckled with blood and forehead soaked in sweat.

You stared back, speechless, and he raised his voice, "Tell me you made a mistake!"

You opened your mouth but nothing came out.

"DO IT FUCKING NOW!"

"I'm sorry, I made a mistake, please stop hurting him!" you wailed.

Oikawa took a step towards you, "Tell me you'll never talk to another boy again."

"I'll never do it again, I swear!"

"Do what?"

"Talk to another boy! Just please don't kill him!"

Oikawa looked disdainfully at the boy and his bloodied, broken face.

"I'm glad we're in agreement!" he said with a bright smile, eyes betraying the darkness within him.