While their parents are away on a honeymoon after remarrying, the younger sister, who always clings affectionately to her older brother, starts teasing him playfully. The brother gets aroused by accidentally seeing up her skirt. Enjoying his reaction, the sister boldly declares, "I can make you cum, big brother!" and performs a self-oral demonstration with deep throat techniques, bringing him to ejaculation. Overwhelmed by pleasure, the brother pins her down, but the sister is equally excited—soon they passionately repeat intercourse over and over, hungrily chasing intense pleasure together.