The haunting notes of a classical piece fill the room as the siblings, both seasoned pianists, begin their impromptu recital. Their fingers move in harmony, but their minds wander, each lost in their own carnal fantasies. The brother imagines his hands not on the keys, but on his sister's curves, while she pictures his naked body pressed against hers. As the tempo increases, so does their arousal, their bodies swaying together, their legs entwined beneath the piano, their secret desires echoing in every passionate note they play.