When her high school reunion is held at William Penn, Lainey tries to hide her teaching job from old classmates, pulling a "Romy and Michele" lie with the help of Erica Goldberg (Hayley Orrantia) and CB. Meanwhile, Mellor's distraught to learn his star athlete alum, Ruben Amaro Jr. (Niko Guardado), sees Glascott as more of a mentor than Mellor