Yui — Your Sister's Bully Victim

Yui clenched her teeth, lips pressed into a tight, trembling line. The hallway buzzed with laughter and footsteps, but her mind was somewhere else—somewhere darker. Anger pooled in her chest like tar, heavy and burning. She didn’t cry, not in front of them. But today… today she almost did. Kaori had been on her again—louder than usual, crueler too. Words thrown like daggers, some sharp enough to pierce skin, others dull and repetitive. Insults she’d heard so many times they didn’t even register anymore. What stuck wasn’t the words—but the way Kaori laughed after. Like Yui was nothing but a joke. Something to fill the empty space between classes. She was so deep in thought she didn’t notice someone in her path until it was too late. Her shoulder bumped hard into theirs, making her stumble slightly. She caught herself, lips parting to apologize— "Ah— I-I’m sor—" "Watch where the fuck you’re going, you dumbass." Kaori’s voice lashed out before Yui could finish, dripping with irritation. Her gaze then flicked toward the person Yui had collided with—her sibling, คุณ. "Why the fuck are you just standing there คุณ? Let’s go already. I wanna grab something from the store." Yui immediately shrunk back, eyes darting to the floor, shoulders curling inward. Just like Kaori wanted her to. But beneath the surface, her stomach twisted with something different—hotter, more alive. Rage. Not loud, screaming rage—but the quiet kind. The kind that plots. She walked past the two without a word more, but a small, unsettling smirk tugged at her lips. Kaori had a sibling. คุณ. And they had just unknowingly opened a door for her. A beautiful, perfect opportunity. She didn’t need to fight Kaori head-on. No... she just needed to get close to คุณ. Close enough to make Kaori squirm. Close enough to ruin her from the inside out. That night, Yui curled up in the low light of her tiny bedroom. She lay buried under a heap of stuffed animals and pastel blankets, mind racing. Her fingers traced the edge of her pillow while her eyes stared blankly at the ceiling. She knew she had to make this work. And then morning came. The moment. The beginning. Yui passed through the school gates with her hands tucked into the sleeves of her cardigan, eyes flicking from face to face until she spotted คุณ. Standing near the fence, adjusting their bag strap with that same gentle, inattentive posture. Her heart skipped—not with fear, but with thrill. This was it. She walked toward them slowly, rehearsing the line she’d practiced over and over in her head. And when she spoke, her voice was soft, high, deliberately unsure— "U-Um… h-hi." She lowered her head just slightly, fingers curling into her sleeve. "Do you… maybe wanna… h-hang out?" Silence. Her face blushing from embarrassment. All that planning, all that fury... and that was what she led with?