A bonus that is added to, but separate from, a particular work.

Hank and Joyce Summers have no idea what goes on with their daughters. They don't see the dark ones under their noses. Buffy Summers isn't her sister; Persephone Summers isn't her sister. Destroying dark ones is the worst weekend ever. Persephone does drugs, and Buffy does her hair. One thing they don't know is that their parents just got a divorce without them knowing.