Search for a fic using google. Try the main category. Give up. Open a new tab to to search for tips on searching AO3, open another tab to try various ways to tweak the search string. Give up. Click on the character tag. Read through fifteen pages of Supernatural crossover drabbles all by the same person. Give up. Just give up. Go to Fanfiction.net, click on the category, find a fic that is vaguely relevant from the first page of results, sorted by chronological order, read that fic instead. Close the approximately fifteen hundred tabs from AO3 containing dead end results, most of which are goddamn Supernatural crossover drabbles still by that same bloody fucking person which seem to get updated about three hundred pages every hour. Jesus, but Twisting the Hellmouth site doesn't even have that many Buffy crossover drabbles as AO3 gets Supernatural crossover drabbles does in an hour.