This Valentine's Day, like hopeless romantics the world over, the Scooby gang of Buffy the Vampire Slayer will be preoccupied with hearts and flowers. But since tonight's installment reunites batty Drusilla (Juliet Landau) with her progeny, the incorrigible Spike (James Marsters), the hearts probably will be ripped out of couples' chests, and the flowers stolen from gravesites. In recognition of this rare moment that Hallmark never anticipated, TV Guide Online asked our favorite femme fatale how the undead keep their love alive.