As Twilight learns that her brother is getting married to another stallion, going against everything their parents taught them about gay relationships being bad, Twilight finds herself not only confused about their love but her own feelings as well.
Fluttershy must deal with the bitter aftermath of breaking up with Twilight, as well as her reason for doing so. Losing access to the castle, her ex's family, and her friendship with Twilight are struggles she faces with the help of her friends.
Princesses Twilight and Celestia were dating when Tempest arrives at Ponyville to learn about friendship. When Twilight and Tempest fall in love, Princess Celestia doesn't handle it as well as she should.