Episode 42 of "Buffy, the Vampire Slayer"
s03e08 Lovers Walk
Title: Lovers Walk
Original Air Date: 11/24/1998 on WB
Director: David Semel
Writer: Dan Vebber
Guest Stars: Jack Plotnick (Deputy Mayor Finch), Suzanne Krull (Clerk)
Plot Outline:
Spike returns to Sunnydale a shadow of his bad-ass vampire self and kidnaps Willow so she can put a love spell on Drusilla. While he is out collecting magic spell ingredients and convincing Buffy why she shouldn't kill him, Willow and Xander lose their inhibitions in the heat of the moment only to be caught in the act by a rescue party in the form of Oz and Cordelia.