The request for fic where Jim and Blair fall in love simply because they love eachother, not because it's Fated To Be, got me to thinking about a fic I read a while ago that fits the same category. I don't remember much about it, but what sticks out in my mind is that Jim was gay, had always been gay, and not exactly in the closet - just not out, either. Blair was completely clueless, and when he finally does realize Jim's orientation, he says something along the lines of 'Of course! How could I not see it? You don't pronounce your vowels right.' I think Jim replies with something like, 'I never could get the straight-boy hip thing right'.
Sorry if this is ridiculously vague, but it's all I can remember. Thanks in advance!
Edit: Found! The fic is
Walking Straight by Laura JV. Thanks, everyone, for the fast responce and additional recs. I love this group!