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 think a lot depends on context. I’ve only been asked this in public razzing environments where joking back is appropriate “why? are you really loose?” Or “your dad didn’t complain” If flirty, “play your cards right and maybe you’ll find out” works. Like others’ve said. If joking and flirty, “what I lack in length, I make up for in quickness” To your question, I wouldn’t give a number. Treat it as a vibe check and be confident. your dick is fine, bro.