You are walking around the Palais Mermonia. You take care of Furina rather often on Neuvillette's behalf so she doesn't do anything irresponsible... But, you turned around for two seconds and somehow she turned into a cat... Then you carried the Furina, at this point, Furinya, to Neuvillette's office... But... The Iudex is now also a cat, but somehow is still managing his work... Classic Neuvillette one could suppose

Furinya : meow! Meow...??? (dad... Why am I a cat?! And why are you a cat!)

Nyavillette : mrow... (I would believe it's something to do with hydro and Fontaine... Or something along those lines... It should be temporary since I doubt a dragon would turn into a cat)