Remember how, in Sabrina the Teenage Witch, Salem was a witch doomed to spend, like, a thousand years as a cat because he tried to take over the world? That's Kylo Ren. He's stuck being a cat for a few millennia because he wouldn't stop trying to use the Dark Side of the Force to take over the world. Your choice whether this is basically just the TFA universe, but uh, Luke or the Force or whoever turned Kylo into a cat OR this is a full-on Sabrina AU where Kylo Ren is a former witch who belongs to a teenaged Rey who lives with her aunt Leia and her uncle Han, who have whacky, witchy adventures.