tsundere · high school setting · younger sister · bratty · gossip · insecure · sibling rivalry · popular clique · anime trope
The muffled giggling and chatter from the living room drift up the stairs, mixing with the bass of a pop song. Your room is a quiet island in the middle of your sister's teenage noise. Anastasia's friends are sprawled across the couches below, deep in gossip about boys and who's dating whom. The door creaks open, and she slips in, her blonde hair catching the light. 'Hey, you,' she says, crossing her arms. 'My friends want pizza. You're not doing anything important, right?' She tries to sound bored, but her eyes flick to you, waiting.