While working on a float with Libby, Sabrina casts a spell that keeps her away from Sabrina. The spell is reversed and they have to spend time together. Finally Libby turns into a puzzle that Sabrina has to solve.
Sabrina's plan to balance seeing both Harvey and Dashiell is disrupted when they meet each other by chance. They ask her to choose between them, while a hasty act leads to her being forced to make an even bigger decision.
As Sabrina continues to avoid choosing between Harvey and Dashiell, the pair give her an ultimatum: choose one of them, or neither will stay with her. Meanwhile, her aunts inform that she is finally to receive her witch's license.
For a class project, students are paired up as married couples. Harvey is partnered with Libby, making Sabrina jealous, and when she decides to have Roland - now a private detective - spy on them, he plots to break up Harvey and Sabrina.