Season Three shows the two trying to balance a professional relationship with seemingly slightly deeper feelings. In Consequences, Sonya orginally turns Birkhoff down when he ask her to dinner saying she would like to "keep their relationship strictly professional", however she seems to change her mind when she later tell him that she's starving. At the end of Black Badge, Birkhoff and Sonya are seen cuddling on the couch and seconds later sharing a kiss. In mid season three birkhoff and sonya are in a romantic relationship. In Broken Home sonya and the others in ops were told that birkhoff tried to kill chris, but sonya did not believe it was true and it was confirmed that chris tried to whack birkhoff in the server room. chris and birkhoff were fighting until sonya killed chris with a machine gun and saved her boyfriend's life.