The only thing I remember is a scene where Brian comes to Justin & Daph's apt the day before the results are back. Justin had refused to see Brian during the waiting period maybe? Anyway, Brian comes over and they have sex, I think. I'm pretty sure. And Brian says that either way it goes he's not going to ever stop wanting Justin so there's no point in waiting until tomorrow for results. Or something like that. Ring anybody's memory bell?
ETA: *Possibly* found, but I really don't think so. I'm going to leave this as an open request so if anyone else can think of another one that might fit, feel free to suggest it. :) Here are the links for the other HIV-scare fics people have remembered. May as well have them in one spot.
qafanfic linked Josselin's
Risk and I'm just not sure if that's the fic I was thinking of or not.
SMS offered up Suz's
Different When.
Here's the link to Chapter 1 of
bigboobedcanuck's
From a Safe Distance. All chapters are linked in her Memories.
Rhiannonhero's
Omelet.
Keep thinking, peoples! :)