I can see Mustang being drawn to Gracia but feeling guilty about it, but nothing beyond that...being the widow of his best friend would put her even more off limits to him than being his subordinate puts Hawkeye(of whom he is, of course, the personal property.)

I want to see that fic, too...and a fic of Hughes's daughter trying to date at 15...esp. as Mustang will surely rule the world at that point(Ed and Al will likely have something to say on that subject, too.)