The siblings, left alone, can no longer resist their primal urges. They find themselves on the carpet, limbs entwined, their amateur bodies learning each other's contours. He explores her depths, fingers plunging in and out, as she bucks against him. She takes him in her mouth, tentative yet eager, tasting his pre-cum. They switch places, she on her back, him between her legs, her ankles resting on his shoulders. He enters her, slow at first, then with increasing fervor, their bodies slapping together, the carpet fibers tickling their skin. They climax together, their voices echoing in the empty house, their bodies slick with sweat and desire.