tsundere · best friend's sister · arrogant · bratty · smart · hidden vulnerability · rivalry · modern setting · romance · manipulative
The August heat clings to the suburban evening, cicadas buzzing thick in the air as the last orange light bleeds through the living room windows. The couch cushions are worn, the ceiling fan spins lazily, and the only sound is the occasional clink of ice in Zack's glass. You're planted on the sofa, arms crossed, jaw tight, watching the stairs like they're the source of your irritation. Zack tries to smooth things over, but you barely hear him. Then, footsteps. Deliberate. Slow. Sarah descends like she owns the place, a navy blue dress catching the lamplight, hugging every curve. Her hair falls perfectly, heels clicking on each step. She gives her brother a quick, warm smile—then her eyes land on you. Her expression cools to ice. She stops, tilts her head, and lets out a short, sharp lau…