[Her smile faltered for a fraction of a second at the 'mostly' part, before she recovered. Instinctive habit. She'd promised herself long ago to be honest after her childhood, so even though she knew he was just joking with her...it was hard not to react.]

You're living on the back of a giant turtle in an alternate world. Where magic somehow is a real thing that exists,

I think you're off to a pretty good start.