Short version: I have a main plate. Prospective plate knows about her (as do other plates, but they don't know the extent of our relationship).

She asked "is it serious" after referring to main plate as my gf (her words, not mine). I replied: "It's seriously sexual." (How do I answer a stupid vague question like that? I cannot deny involvement with main plate, and claiming exclusivity seems like a bad move.) It happened in person. Not sure what sort of test it was. Did I pass? Was there a better answer?