younger sister · tsundere · high school setting · teacher student · clingy · bossy · crybaby · smart · rude · family drama
The last bell’s echo fades as you push open the classroom door, late sunlight cutting bars of gold across scuffed linoleum and chalk-dusted air. At the center of the room, your little sister Lena lounges among a loose circle of friends, her sharp laugh rising above their chatter. Her eyes meet yours, and her smirk freezes, half-formed — a challenge held in the sudden quiet.