Tiers of fanfic accessibility:
1. Written for general audiences
2. Presumes familiarity with the source material’s major characters and the broad outlines of its premise
3. Presumes familiarity with the events of individual episodes/chapters of the source material
4. Presumes familiarity with a particular fandom AU
5. Presumes familiarity with a specific headcanon, joke or meme known only to those who’ve been following the author’s blog since 2012