A sister, aged 19, and her brother, 18, find themselves alone and tempted. She, a mature and confident woman, takes charge, showing him the pleasures of the flesh. She guides his inexperienced hands to her breasts, teaching him how to fondle and squeeze. She moans as he learns, his touch igniting her desires. She leads him to her bed, where she strips, revealing her naked body to him. He tentatively touches her, exploring her folds, before she takes him in her mouth, teaching him the art of pleasure, culminating in a forbidden, yet passionate union.