Your native transformative powers are significantly greater than the average fox.  You learn the Polymorph spell and can cast it without expending a spell slot; when you cast Polymorph you must target yourself, and you take the form of a fox.  Use the statistics for the Cat, save that you retain your Intelligence, Wisdom, and Charisma scores, and the ability to cast the spells granted by your Kitsune Magic trait and the Vexing Illusionist feat, if you have it.  Wisdom is your spellcasting ability for this version of Polymorph.

You may cast this version of Polymorph a number of times equal to your Wisdom modifier (minimum of once), and regain all expended uses when you complete a long rest.  You may also expend a use of this feat to cast the Alter Self spell granted by your Kitsune Magic trait, instead.