@mlucas I watched Black Panther, but I never really analyzed it. I'll have to take a look again.
@Flight I'll check these out, as well, they sound fairly close to what I'm looking for.
Actually, to better answer that question, here's an ideal example of what I'd like to find: The RS would initially focus on the relationship between Jim and Jane. Later in the story, somewhere around the end of traditional act one, we also meet Mary and Mark, who have a relationship. This relationship need not necessarily be the same. Marriage for one, while barely friends for the other is perfectly fine. By the end of the story, though, the focus will have turned toward the relationship between Mary and Mark.
If there were something like that...