Emotional Enigma of an Exceptional Ensemble (гет)

Lucius Malfoy has never taken as much interest in music as his wife - or as Severus Snape. So he hardly cares when Narcissa invites Severus to join them at a concert they are attending in honor of Cissa's birthday (oh, and Valentine's Day). But maybe he should... Everyone's favorite insufferable-know-it-all makes an appearance.