The park night scenes, particularly if you pick the right options.
Rosie reflects on all the times you've helped her and thanks you for everything... before asking whether you've come to hate her for always getting into trouble. Say no and she'll cheer right back up.
Duna tries to clear the air between the two of you, giving a brief explanation of who and what she is. Then the topic turns to how you saved her from being crushed by a rock immediately after trying to steal the MacGuffin from you and trying to kill you for seeing her true form. Then she "hypothetically" asks whether you'd do the same if the two of you were actively at war. It's already clear how much of an impact your kindness and positive attitude is having on her.