While my younger sister naps during the day, or lies asleep after masturbating, she exudes a mysterious charm as if lost in a dream. Her body has gradually matured without me realizing—her breasts now form a soft cleavage, her thighs carrying a firm yet tender roundness. Mesmerized by her figure, I feel heat building in my groin. Without thinking, my hand reaches toward her skirt. In the silent room, our relationship begins to shift into something new.