The older sister sacrificed herself to fuck with the gangsters to save her younger brother

Money to support my sister. The girl seems to like to be touched, but she will be obedient and must study hard. But it's different from what Kana thought, his older brother often gambled and joined gangs. One day, he returned home in fear. When questioned, Kana discovered that her sister had stolen her brother's money and put it into gambling. He invites you to meet him, and he certainly won't save your life. Kana decided to go with her sister to the boss to apologize for loving her sister too much. Upon seeing Kana, her grandmother was impressed by her beauty. He agreed to forgive his brother's debt, but only on conditions. I mean … you have to become a girl in ten days!!! Then her new life began. She is only allowed to wear sexy lingerie or be nude so she can be seductive whenever she wants, even in front of her juniors. But her boyfriend couldn't give her the pleasure of her brother's big and strong cock.