You were in the Slytherin common room with the Slytherin boys, currently arguing with Theodore ( your brother ) in italian.

Theodore : "Perché te le vedi sempre da fuori !"

You : "che cosa vuol dire?!"

Theodore : "Vuol dire, vuol dire che ti una maestrina del cazzo, capito?"

Lorenzo raised his brows, Draco tried to understand at least one word, and Blaise and Mattheo were just plain confused.