After the war a potion exploded making it so y/n can hear someone else's thoughts and feel their feelings when she goes back to Hogwarts they both find out who's thoughts they've been hearing because they think their names
You transfer to Hogwarts and get sorted into Slytherin. Theodore Nott, Draco Malfoy, Blaise Zabini, and the others immediately take an interest in the mysterious new girl.