A very small collection of somewhat obscure fanfiction. For more hits, I suspect fanfiction.net or a similar gallery has quite a bunch ^^
In alphabetical order by title

Work (title):	Brief description:	Author:
Aftermath	A story focusing on Akane after the results of OAV 6.	Nae
Love, Denail, and Invisible Men	A script format fic about the Mahou Club on their second summer vacation.	Tarra Nakatsu
Jeff-kun Monogatari	(or so it's temporarily titled). A narrative story from the perspective of Jeff-kun, and a look into his past.	Luriko-Ysabeth
Mitsuha	(or so it's temporarily titled). A story featuring Miyama which takes place in the Yu Yu Hakusho universe (not a crossover per say, but it uses the universe).	Luriko-Ysabeth
More Than Just a Friend	A short romantic story involving Aburatsubo-senpai and Nanaka ^^	Julie Farel