Due to their mother’s remarriage, Yu and Yuria moved in with their new stepfather. Neither liked their mother’s sudden remarriage and resented their stepfather. Unbeknownst to them, he was a pervert. When his wife was away, he booked two call girls for a threesome at a hotel. When the doorbell rang, he opened it to find Yu standing there. As they reeled in shock, Yuria approached from afar. Both of their stepfather’s stepdaughters were prostitutes! Though lustful, he didn’t dare sleep with his wife’s daughters. They agreed to keep it secret and pretend nothing happened. But soon after, Yu was fired from the brothel, leaving her penniless. Wanting a new bag, she seduced her stepfather, offering her body for money. Yuria discovered their secret and, not to be outdone, seduced him too, showing him who could please him better. Yu found out, and the sisters began competing with their bodies to see who could satisfy him most. They even wanted him to divorce their mother and marry them instead!