I'll give you a hint: she ate 20 cakes. Not 20 cake slices, 20 cakes.Why doesn't her sister just get muscular? I mean, she knows he has that fetish for a long time. And it is not like it would be hard for her, she is not a witch or a princess, she is a martial artist, actually she should be quite toned already.
While I'm sure she meant it like cupcakes or something like that, I like your interpretation much more and so will agree with you cause funnier.I'll give you a hint: she ate 20 cakes. Not 20 cake slices, 20 cakes.