Darby was a former California University alumni, who was on the gymnastics team, and was hired as a nanny for Steve Sanders and Janet Sosna to take care of Madeline Sanders. At first, she seemed innocent and sweet.
However, after she went on a date with Noah Hunter, she soon showed her sexual side, seducing him with whipped cream and chocolate. When Noah told Steve about the encounter, Steve remembered having a one-night stand with her in college.
When Steve told Janet, she politely fired Darby, but Darby didn't even remember Steve, which wounded his ego.