It's no problem, broos! Yeah, you get to choose to romance the two people later in the game if you're romancing one of the characters in the poly relationship, for example *SPOILERS*
If you want to romance Finn and Ezra, which is what I'm doing, you have to romance Finn or Ezra, then later in the game, you get to choose if you want to stay with just one of them, or go with both of them. Same for Omen and Alkar!