You actually have a couple of options in this case.
Since The Crypt is part of The Rookie universe you could place your fan fic under The Rookie Fan Fic Forum. Another option is to place it in the General Fan Fic Forum. Under the General Fan Fic Forum you will also find Junkie Mae's Chop Shop. If you feel so inclined, submit your fan fic to Mae and she will read it as part of her Chop Shop podcast.
--Gmork (MP, CA, WC, TG, MoGC, AAGC, PWTG, TBG)