OK, I'm getting a migraine trying to find this fic, but I know someone out there will know what the hell I'm talking about!
I believe, at the beginning of the story, Brian is at home & Justin comes to visit out of the blue (maybe late at night). He may be going thru a divorce or something (?)...can't really remember, but I do seem to recall both of them being cops, long-time friends and one was straight or so it seemed (really think it was Justin). That's about all I can remember.
I looked under the b/j: police/private eye/federal agt tag, as well as the b/j: think the other is straight and the b/j: think they are straight tags and nothing jumped out at me, but I am very tired & I do have a nasty headache so I'd appreciate any and all help!
Found! Link provided in the comments by the awesome
imnotskerrd