Minami is living a happy life, and her boyfriend has just proposed to her. At this moment, her younger brother suddenly visits after five years of not seeing each other. Although her brother says he's there to see how Minami's life is going, she doesn't believe it. After pressing him, she finds out that he owes the mafia 100 million yen! That's an enormous amount, and Minami cannot possibly raise it in such a short time. Her brother is aware of this and doesn't want her to get involved; he plans to find a way to escape. But escaping from the mafia is not that easy, is it? This is Minami's dearest younger brother, her only family, so she can't just stand by and watch. She goes with her brother to talk and pleads with the mafia boss for more time. But he can't wait that long. Seeing Minami's incredibly attractive body, he has the idea of wanting to have her. After thinking it over, he makes a deal with the two siblings: be his woman for ten days in exchange for freedom for both. Her brother decided not to agree, but since there was no other way, Minami accepted the deal. She's only allowed to wear a sexy lingerie, ready to suck cock, get her pussy out for him to fuck anytime he wants, even in front of his juniors! During these ten days, Minami's body was always covered with sperm, and the feeling of shame but extreme happiness made her body gradually become more slutty. She craved his cock more and more, unable to live without being fucked by him! She ignored her fiancé, ignored her beloved brother. Even though it was ten days up, she didn't want to leave, she wanted to stay here to be his woman, to enjoy the feeling of happiness he brought...