They end up in new york (but I'll read anything in character and written well enough. I love this pairing and they could be together on a moonbase for Nasa and I'd still read it), specifically, Queens, because dear GOD, Justin, do you know how expensive Manhattan is?! (And I like Queens, so there) That and the idea of Brian making his oh so nose in the air clients schlep down to Queens tickles me. (...there's also the pun, but then I'm just stupid)
Justin struggles, sure, but makes a decent enough living after a while. Also, there is Rage. In which there are action figures. And possibly a video game. That probably didn't do well.
No Britin, but yes Babylon. I can't see Brian ever getting rid of it, just because of what it meant to him. Yes Kinnetik (duh) but the home office in the pitts and a satillite in NY. Yes loft, for visits and things. Because I can see them both refusing to stay with anyone and after a while anyone refusing to have them stay the night. Just because they're insatiable.
Lindsay, Gus, JR, Mel in Canada, but visits abound.
Ben and Michael. I'm sorry, I love them. Michael goes stupid ballistic freak out and Ben is so ... adorably zen reasonable. I just love that. They fit together. Ben needs someone to be reasonable for.
Ted and Blake. Because Teddy deserves to be less sullen. But not Drew and Emmey. I can see Emmett with that guy in 513 with the dark hair from his hometown, though.
No rings. Unless it's a stupid spur of the moment crackerjack box ring as a joke-not joke thing, and someone needs to write a fic of that now that I think about it.
Fucking raw, but eventually, and probably one random night when they both realize they haven't fucked anyone else in a while. Condoms are just habits for them. It's awful. I can imagine Brian holding the stupid rubber and thinking really hard about when he was last tested and who he's been with (no one else) and going "...Sunshine, when was the last time you screwed someone besides me?" then blowing up condoms like idiots.