If a girl asks you if you're big, are you supposed to lie or not? - Discuss Online

This reads like a joke question, I know, but I actually mean it. Are you supposed to answer this sort of suggestive question with honesty? Or is this generally meant to be answered either in coy or affirmation? Because I don’t want to ruin the mood but I also don’t want to unwittingly spoil her expectations. (FYI, I’m average sized.)