#dark!bashir

I am reading a fic that is taking it as read that Garak and the Bashir changeling were fucking. I haven't gotten to this ep in my most recent rewatch but I don't remember the changeling and Garak even interacting but the once? Is this widely accepted canon and can I read more of it? There seems to be even a dark!changeling!bashir version who toys with Garak's sentimentalities, plays sexual headgames, and devistates him with gay exiled shame when the truth drops.