It is perfectly possible to write a terrific romance where the MCs never clash with one another, even in a small way. But even the lowest-angst, most comfort-blanket read has obstacles, things that get in the MCs’ way individually or as a couple. Where they struggle and how they deal with it is the engine that drives the plot, shows character in action, and lets the relationship develop.
So the question for the romance writer is:
What are the obstacles, internal and external, that complicate, slow, or threaten the relationship?
Combine KJ Charles’ romance relationship obstacles framework with Jami Gold’s story obstacles “two steps back” approach