When Stefan loses control and feeds on someone, Bonnie uses her powers to stop him.
In Isobel, Stefan goes to Bonnie for help after Isobel's dangerous actions.
The possibility of a romantic relationship between them is referred to as "Stefonnie" by fans.
In Pilot, Bonnie meets Stefan on the first day of a new school year she was very smitten with his looks and started to realize that he was really looking at Elena.
In Bad Moon Rising, Stefan asks Bonnie to aid him in crafting a Lapis Lazuli ring for Caroline Forbes.