While their parents are away for a few days, the brother repeatedly takes secret photos of his sister while they are alone in the house. His vile actions escalate, and the brother, who has reached his limit of patience, reaches out to his sister's body, which has developed... The perverted brother, who is a school swimsuit maniac, demands his sister's twisted sexual proclivities and devours every inch of her body! The sister resists at first, but she becomes addicted to her brother's repeated creampie sex in school swimsuits, and in the end, she begins to ask for her brother's dick... A school swimsuit and a sister with pure and innocent big breasts that are still developing are the best combination!