Baby AU: When the entire cast or most of them are reverted into children or babies. Usually one of the characters is still an adult that takes care of them until they figure out how to change them back into adults again.
Bakery AU: When most of the cast of a story works at a bakery while the rest are customers.
BDSM AU: Is when the entire cast is either a dominant or a submissive and BDSM relationships are considered the norm. Be advised that while a healthy BDSM relationship is consensual and not dangerous, if handled incorrectly it can result in abusive behavior which is offensive and considered bad BDSM etiquette.
Bookstore AU: When most of the casts works at a bookstore. If not, usually a few of the characters work there, while the rest of them are customers. Another version is the Library AU, in which one or two of the characters are librarians, while the rest of the cast spend their time looking for particular books.
Business AU: In which the story is set in a building and the characters are employees. Sometimes it is focus on one character who works as a secretary and another character as their boss.
YOU ARE READING
The AU Dictionary
RandomA book explaining all of the different AU's. None of these belong to me. I got this from a blog I saw.
