Just in time to see you, Kyouya pressed his back to the wall, eavesdropping into your conversation. He had sprinted all the way from the cafeteria, only to see Hikaru had got to you first. He turned only his head, observing the two of you in plain sight while staying hidden. His chest grew heavy and his fingernails dug deeper into the walls. Someone being so close to you - it pissed him off.
Your eyes were puffy red, from all your crying, and Kyouya noticed it right away. He felt a pang of regret. Ever so slightly. He remained steady, but when the brown haired boy inched closer, Kyouya flinched. Kyouya paused for a moment; unable to comprehend why he was listening in or even cared.
"You've fallen in love with Sata-san, haven't you?"
Kyouya's intense gaze fell on you, waiting for your response. His face was as dull as ever, crossing his arms and narrowing his eyes. It didn't matter to him, what you felt for him. At least, that's what he thought.
He watched as your face fell, a spark of uncertainty to flicker in Kyouya's heart. "If you tell me you've fallen in love with him, then I won't kiss you."
His entire body froze. Kyouya's clenched his fists and grimaced, the feeling of jealously resounding within his entire body. He knew not to act hastily, but just watched. He watched with an overwhelming need to snatch you right there, but he wanted to know. He wanted to know what you were feeling. He wanted to understand for even just a second what was going on in your mind.
He watched as Hikaru placed his hand against your chin, his lips only moving closer.
He could hear time ticking slower and slower with each and every passing moment. Everything seemed to stop except for the sound of his heart thumping and you. But then what was done was done. He had seen what happened.
Kyouya's eyes darkened. His hands pushed himself away from the wall and headed the direction away from you.
"The idiot."
***
He sat on his bed, pulling out his cellphone and flipping it open."No texts from the dog," he muttered under his breath, snapping it closed before realizing what had just subconsciously occurred. He had grown so fond of you that everyday afterschool he would expect some kind of message, but today was different. Not only was he reminded of what happened earlier today, but just the thought of it ticked him off.
Kyouya slumped onto the bed, holding the phone in a fist as he held it above his head, wondering if the notification for a text light would go off at any second.
Suddenly, the doorbell rang, surprising Kyouya enough for him to drop his phone. "Shit!" he cursed, a shattered phone on his floor.
He lifted his body up and ran his fingers through his messy hair in exhaustion. Shuffling his feet, he opened the front door to see a familiar face. Her lips curved into a bright smile and looped her arms around Kyouya's neck, leaning in closer to meet his scarlet eyes.
"I'm bored, Kyouya~" she sang, subtly rubbing one of her hands against him over his jeans.
"Not today." He moved her hands away and leaned his head against the doorframe. "I think it'd be better if we didn't see each other anymore."
"Haah?" she pouted, crossing her arms, but then her face lit up. "Wait wait! Don't tell me, you finally fell in love?"
"Like hell," he growled.
"Heehee, then a girlfriend? Is she cute? Cuter than me?"
"I can think of a lot of things cuter than you."
"Ehhh? Kyouya-kun, don't be so mean! But really, who's this lucky girl?" she giggled.
"You know love makes me sick."
"Tsundere!" she pouted again.
"Just go."
She gave a defeated sigh. "Treat her well, Kyouya. For her sake, but most importantly, yours."
"Whatever you say. Just let me be alone."
He shut the door with a thump, retreating back to his bedroom and gathering the scattered broken pieces of the phone.
"That's not it, is it? You've fallen in love with Sata-san, haven't you?"
"Wh-what?!"
"Because, I really like you too, [Name]. I don't want to love someone who doesn't love me back."
"I...I..."
"Can't. I...I love... Kyouya."
Kyouya clutched his broken phone tighter in his hand. He had to hear it himself. He was angry. Pissed that you loved him. Pissed that an idiot like you just had to go fall in love. Loving someone like him never ended well for anyone.
And he knew it well enough.

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Sadistic | Sata Kyouya x Reader
Fanfictionnever one for love, heartless sata kyouya would never have expected to be falling for someone like you. [sata kyouya x reader] // wolf girl and black prince