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.)
There’s no right answer.
So many dudes lie about having a big dick that no woman will ever believe any man that tells them they do.
If you tell them no they’ll probably believe you.
The correct answer is some kind of coy flirty response like “play your cards right and you’ll find out”.