So, in my book, a sweeping sci-fi epic spanning multiple planets with multiple wars stacking on one another and growing in magnitude, I have two MC's, male and female. Both are extremely key to events throughout the story (the male being more of the main MAIN character), and eventually through some form of fate, they meet and are forced to work together, the male serving as a bodyguard of sorts. Initially, the female cannot stand even being in the male's presence, as he used to fight for a cause that she thought was corrupt. She makes snap judgements about him and makes up her mind that she does not like him. But after they are essentially forced by ensuing events to spend some time together, and get through a few near death close calls, their love begins to unfurl and they eventually fall. The story itself jumps back and forth from their points of view, told in a 3rd person perspective, as well as the POV of a few characters of lesser relevance. Does it break any rules that I may not know about, to write from the POV of two protagonists who are also lovers?