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In episode 23, Ellis tries to leave Nadie fearing that she's going to end up hurting Nadie by staying with her. Near the end of the episode, Nadie catches up to Ellis and grabs her saying that she won't let go. Nadie then hugs her and a gives a speech where she vows to protect Ellis and not let her face painful events alone. Ellis smiles, tears up, and accepts Nadie's partnership with an enthusiastic "Yes, sir!".
Right before that, Ellis buying tacos for L.A and herself.