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 in coy and 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.)
I am not a good person to ask because I’ve never been asked that question. My only suggestion is to try to discern the tone of her voice when she asks.
You are allowed to ask “are you serious?”