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

THE WRONG TWIN (Miya Osamu)

Asked privately on my Quotev! Another attempt to write longer.

Title: The Wrong Twin

Pairings: Yandere! Miya Osamu x F! Reader

WARNINGS: yandere themes, timeskip spoilers for Osamu's job

"Here she is!" Atsumu sang, flinging his arms open to frame your confused and, frankly, embarrassed figure.

"Atsumu..." you trailed off, playing with your fingers and staring down at the floor.

"'Samu," Atsumu placed his hands on his hips, "Aren't ya going to say 'hello'?"

Osamu didn't look up right away. He continued slicing a cucumber with practiced ease for a full 30 seconds before his cool gray eyes finally landed on you. He gave you a shallow nod, said "hey", then returned to the vegetables.

"I've heard a lot about you," you said nervously.

"I bet," came his dry response.

Atsumu snorted, "Don't mind him, he's grumpy when he's hungry."

"I'm not hungry," Osamu said blandly, "I just don't get excited about temporary things."

He looked you over a second time. Sweet. Shy. Not really Atsumu's usual type. If anything, you were more Osamu's type, but anyone who picked Atsumu as their boyfriend must be incredibly dense.

You shot a questioning look at Atsumu, and Osamu almost laughed. You must be dumb if you haven't heard about Atsumu's extensive dating history. Pump and dump kinda guy- you'd be lucky if you lasted a week.

"'Samu," Atsumu whined, "Ya know I wouldn't introduce her to ya if she wasn't important. We've been dating a whole month."

Osamu stopped cutting vegetables, blinking in surprise. A month? Well, that was certainly... interesting.

His eyes narrowed as he studied your face again. Your eyes darted away bashfully, like you were worried he was judging you. He was.

Atsumu, dating someone for a month? Without cheating and ghosting? That was a miracle. But now he was dragging her into his shop, asking for his approval like they were a couple of teenagers visiting the parents. Unbelievable.

He turned back to the cutting board and started chopping again. The knife was hitting the wood a little harder now. "Yer serious?" he asked without looking up again.

Atsumu laughed, "'Course I am. You think I bring every girl into the apartment? Nah. This one's special." He wrapped an arm around your waist and pulled you in for a kiss.

Special.

He watched you out of the corner of his eye. You looked so happy and hopeful, like you believed him. Poor thing.

"She know about Ame? Or Hana? Or that girl from training camp- what was her name again?" Osamu asked innocently.

Atsumu shook his head, looking a little pissed, "Why are ya bringing that up now?"

Osamu watched the way your smile faltered. Good. Maybe you're not completely braindead.

You opened your mouth like you were going to ask, but you closed it again, looking at Atsumu expectantly. You were clearly waiting for an explanation.

He didn't offer one. Instead, he intertwined your fingers with his and smiled at you.

Osamu gripped the knife tighter. "A whole month- hope it lasts." His mind raced. If it didn't last- and it wouldn't- then what?