A man who is jealous of his best friend living with her beautiful girl and making her happy breaks into the apartment where the two live. Taking advantage of her weaknesses, her boyfriend is under house arrest for three days while on a business trip, and she begins to commit herself whenever she wants. She who hated at first was gradually trained with his big cock and rough sexual intercourse, and finally even when her boyfriend came home, she was panting while holding a cock in her vagina.