Unbeknownst to their parents, siblings Ana and Luis find themselves alone and suddenly drawn to each other in their stuffy closet. Ana, the elder, notices Luis's growing excitement and decides to tease him, slowly revealing her cleavage. Luis, unable to control himself, reaches out to touch her, igniting a fire that consumes them both. They explore each other's bodies, Ana taking Luis's virginity with a feverish passion, their moans echoed only by the ticking clock.