Someone nominated a pair of obscure German fandoms that the mods couldn't find any information on, since the nominator had apparently just made them up to pad their requests. The nominator wrote some short ficlets in an effort to support the ruse, and of course what happens when other people discover that you've made up a fake fandom is that they start building on it and writing their own fic for it too.

The backstory:
https://coaltide.dreamwidth.org/4554.html?thread=8477898#cmt8477898

The emerging fandom:
https://archiveofourown.org/tags/Winterblumensaat