Not to sound like a right 'Biotch' but seriously a simple search using 'Buffy Deaf' in the 'Found Fics' forum, pulled up several links for this. Because people keep asking for stories that have already been found :d
PLEASE do a quick search before posting 'again' about a fic that's already been found.
Go here:
https://www.spikeluver.com/Forum/index.php?action=searchIn the 'Search For' area type some word that you think will garner the best results. To the right click the link, 'Where to Search' and then 'Forum', the rest should be self explanatory.