@JayBoy is the same... but we don't use that in Mexico... when you want get a date with someone, you ask for a date. you don't ask "you will be my Valentine?", here, you tell "I like you" at the person who you want, and if she or he say "yes, I like you too", then you ask her (or him): Do you want hang on with me? or, do you want have a date with me?... the people here aren't like Japan, lol, here all is more fast, lol. then, you just say: DO YOU WANT BE MY GIRLFRIEND? (or my boyfriend?)... that mean: ¿QUIERES SER MI NOVIA? (o mi novio?)... that is the ask, after that, you have a Relation with the other person.