There does exist a romance branch that we rushed. I mostly programmed gameplay logic and didn't do much of the writing, so I can't speak too much about the intended stories as a result. I do note that you are very likely to end up in the Tyranny of other Races branch where you have the "Enslave other races" mini-game, since it defaults to that unless you meet somewhat specific criteria.
Is it contingent upon where I choose to go after warning the humans? Because I can't imagine I would have to *not* warn them. In that case, the awkwardness results from a personality trait being contingent upon a choice that's not transparent to the player. Players wouldn't expect that choice to affect their character's personality, because the choice is just of a location, and in particular one the player knows nothing about.