Sabrina invites Aaron's parents to dinner and discovers that her fiancé has been keeping a big secret. As tensions mount among her bickering guests, she casts a harmony spell that yields unexpected results. Also unexpected is a revealing slip of the tongue made by Sabrina.

When Aunt Irma finds out that Sabrina is marrying a mortal she turns Aaron into a fish. The episode ends with Sabrina finding Harvey's note that says that he will always love her.