An extremely creepy, and often perverted, form of writing, if it can be called that. Usually the author is a crazed Fangirl who either wants to add themselves into a story, or have a love life with a
celebrity they otherwise have no chance with, or pair two people in a way that should honestly never come to mind.
Fan Fiction is often badly written by illiterates, and usually features some, quite frankly, disturbing scenes. I advise anyone who still has their sanity, or something similar to it, to steer
clear of
fan fiction. It's traumatising, and truly, you'll never be the same again.