Some suggestions that would fit the theme I'm looking for:
-Something like Issues, maybe involving one of them giving the "shovel talk" to the other's partner
-Matchmaking, if they put a really ridiculous amount of effort into it
-Everyone else assuming they must be dating because of the way they act
-Getting married for solely pragmatic reasons (e.g. hospital visitation rights--I read and enjoyed a fic like that once, but I can't remember the name now)
It's actually fine if they get together at the end, but I do not want any pining, thank you. (I have read too much pining lately.) Most of the fic has to feature them as friends content with their current situation.
Fics where they're in a romantic but nonsexual relationship (say, because one is ace) are not *exactly* what I'm looking for... but hey, if you know a good one, go ahead and rec it. Can always use more of those anyway.