Two Can Keep A Secret (Bonkai)

...if one of them is dead. Bonnie has secrets; she has big secrets and small secrets, but only three are unfurling far from her reach. Three secrets that under no circumstances is anyone allowed to find out, at least, no one living. It starts with a trip back to the prison world where Kai is chained up, and things just get out of hand from there. Magic wants the two most powerful witches around to have an equally powerful kid. Seems simple when it's said like that, huh?