And the Duke falls in love with her because she has a magical v*gina. A long list of coincidences leads him to find out how incredible her hooha feels. That's it. She's not skilled, not particularly beautiful, it's not even really her personality because she does a 180 part-way through when she stops pretending to be a doll. Just because she's super cute when they do it and she has the v*gina of one of those pure white lotuses.