The bond between Jason and Lucia

Nelson puts the choice plainly: Jason and Lucia can go through the story as a couple or as accomplices, and it is the player who decides. A bond left uncultivated does not fail the mission or lock a path. It simply loses what closeness unlocks, holding hands and kissing among the things he names.

The feeding mechanism is the phone. The two write to each other between missions about what they are doing, and previews of the Extended Look report that ignoring those messages often enough damages the bond. The same video shows a message arriving mid-mission, with Lucia describing the enemies ahead, so the thread is not purely decorative.

Nelson is careful on this point. Letting the connection go cold is not a permanent judgement on your playthrough; it can be rebuilt. That is the difference between a relationship system and a morality meter, and it fits the same line he takes on the Criminal Profile, which grades what kind of criminal you are rather than sorting you into good and bad.