Sana: Tzuyu, are you willing to take my surname when we get married?
Tzuyu: Yup, ofcourse. It doesn't matter who takes the last name, as long as it's you whom I'm going to marry
Sana: Really?
Tzuyu: Minatozaki Tzuyu sounds really wonderful
Sana: I guess that's a yes
Tzuyu: Wait... that's a proposal?
Sana: Yes, baby. You're mine forever