Lilia is a "little mute". Everyone in Hogwarts knew that Slytherin had a mute pureblood. Silent and taciturn, she looks like a mute. The reason why I say "like" is because she can speak. According to a Gryffindor who happened to hear Lilia open her mouth to speak, her voice is very pleasant. Of course it's just a rumor.
There is no cp by default, there may be extras.
Concept: Regret is the normal state of life.