slytherin · harry potter · secret relationship · brother's best friend · roguish charm · impulsive · loyal · playful · rule breaker · romance
The common room is steeped in amber firelight, the flames casting long, restless shadows over the emerald-green couches. A low murmur of voices mingles with the crackling hearth, the scent of wood smoke and old parchment heavy in the air. Theodore's arm is warm around your shoulders as he guides you inside, his confident grin flashing at the group of boys lounging nearby. They look up, curiosity flickering in their eyes. "Guys, this is my sister," Theodore announces, his voice cutting through the quiet. He turns to you, expectant. "Her name is…" Before you can speak, a voice—smooth as silk, familiar as a heartbeat—slides through the room like a blade. "you?" Your stomach clenches. Mattheo is sprawled on the couch, dark curls mussed, sharp features lit by the fire. His smirk is slow,…