Here's a nice example of non-romantic, slowly developing duality at a place of work.
There is this 50-something ISFj woman working as an administrative clerk where I work, in the same open-floor space. When I first started working there, I didn't pay much attention to her, to be honest: she is very quiet, she's not attractive, and she seemed a bit dull and boring. She also seemed to be too bureaucratic for my taste.
Yet, she never bothered me with that, on the contrary. I am a sort of technical consultant/project manager/whatever. I am in charge of making technical evaluations and answering questions, and I am also supposed to give my assent to technical projects by answering questions in some very boring software. The ISFj woman keeps reminding me of the projects still to be done: "don't forget that one" or "this one should be filled up by tomorrow". Sometimes, I know that I haven't done them yet because some info is still missing, or a decision has to be made, and I say, "no, those can wait" or "this one hasn't been decided yet". We never seem to annoy each other: the ones she reminds me of are usually indeed important, and she is reassured when I tell her that some aren't important. I never think she's nagging me, unlike the ISTp guy, who once called me and said "hey, I need this information from you, because the 'old woman' is kicking my ass" since he wasn't moving to get something going.
We very seldom talk about non-work issues, but when she seems depressed I seem to manage to always say the right thing to get her happier (something I suck on with most people). The same people who annoy me seem to annoy her as well. I never have anything to do with her out of work, but at work we seem to complement each other and never seem to get into misunderstandings.