A new stepsister arrives, her youthful innocence masking a growing curiosity about her older stepbrother. As they share a house, their interactions become increasingly charged with an unspoken tension. One afternoon, as she tries on new outfits in front of a mirror, she catches him watching her. Their eyes meet, and the room seems to grow warmer. She plays with her hair, twirling it around her finger, and he can't help but notice her developing figure. The line between family and desire begins to blur.