When their mother remarried, Yu and Yuria moved in to live with their new stepfather. Both Yu and Yuria were unhappy about their mother's sudden remarriage and also directed their anger towards this stepfather. However, they did not know that their stepfather was also very promiscuous. Taking advantage of his wife's absence, he went to a hotel to arrange for two girls for a threesome. Shortly after the doorbell rang, he eagerly opened the door only to find Yu standing in front of him! Both were still shocked when Yuria approached from a distance. It turned out that both daughters of his wife were also prostitutes!!! Although he was promiscuous, their stepfather did not dare to "have" his wife's two beautiful daughters. The three of them decided to keep this a secret and pretend that nothing had happened. However, a few days later, the stepfather's side decided to fire Yu, leaving her without income. She wanted to buy a purse but had no money. She immediately thought of her wealthy stepfather. She seduced him, offering her body in exchange for money to buy a new purse. Yuria discovered the secret of the two and, not wanting to be outdone by her sister, also went to the stepfather's room to seduce him, showing him who could make him feel better. Yu also found out and from then on, both sisters began to use their bodies to see who could make the stepfather feel the most pleasure. They even wanted the stepfather to divorce their mother and marry one of them as his wife!!!