Lyra has left Canterlot with it's snooty upper class types for the more rustic setting of Ponyville.
BonBon is a champion sweet maker from Ponyville owning one of the most premier confectionary shops in all of Equestria.
After a bad first impression, when Lyra is down on her luck it is BonBon who offers her a helping hoof and a friendship is formed. Then it becomes a bit more.

Cover Art copyright to Moozua
Proofreading/Editing from chapter 4 onwards by Scooty