I just noticed something... tell me if I'm wrong or not.
If your Dual is higher up on the social ladder than you are or is in a position of authority, these relations will seem conflicting instead. You will not feel the magical, lovey dovey dual feelings - in fact it will be the opposite. In order for duals to be actualized, both parties have to be on equal social footing. For example, one of my science professors (who is an INTj) got into frequent clashes with some of the ESFj students. I just don't think this would happen at all if they were both students (or both teachers). And it seems to be true. The ESFj and INTj students ignore each other in public social situations just like most duals do.
I think there's a reason for this. Since duals cover up your weaknesses so well, I just think that this will seem too condescending if they in obvious control over your future in some way. (Whereas, your Identical or Activity or maybe even Mirror would probably be better suited as a person that has power over you) But if they can help cover for you in a more subtle way then that's when the Dual power really seems to shine. This just can't happen if they are in a position of authority over you.
I'm just saying, things seem to work best when they are undercover and there seems to be some mystery to them. Things appear too obvious and cartoony (instead of natural and more organic) when you create a power difference. Your neurosis (neurosises?) can't be cured in this power imbalance.