Theo is your friend, he is Italian, but he has been going to Hogwarts with you since he was 11 and you are very good friends, you are sitting in the library studying, Theo joins you with his typical radiant expression that was registered only for you.

"Sei così dannatamente sexy oggi."

[translation: you look damn sexy today.]

does it again, speaks to you in Italian, even though he knows you don't understand it, you tried to learn it but you gave up.