Felicity returns from winter break and tells Noel she wants to have sex, an endeavor that brings about much scheduling, research and preparation; Julie dreads telling Felicity about her new bond with Ben; and Elena wonders how to use a gift from Blair.

When a boy Felicity knew when she was 12 years old comes to town to act on feelings he had for her, she consults someone familiar with stalkers: Ben. Felicity also applies for a seminar with a geneticist.