Here's a rather than a direct file (since sharing copyrighted/Patreon-locked fanfic PDFs without permission violates most authors' terms and could break platform rules):
It sounds like you're looking for a PDF of the fanfiction Supernatural Nevermore (likely a Supernatural / Nevermore crossover, possibly by an author like "TardisIsTheOnlyWayToTravel" or similar on Archive of Our Own).
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