The father had taken in his unemployed stepson and allowed him to live with the family, giving him a small stipend as a token payment for helping with household chores. One night, the father notices his daughter comforting his stepson—and feels an unexpected stirring in his groin. The next morning, while cleaning the room, the daughter discovers her father's erect cock and begins sensing something is off. Later, during a night of drinking together, the daughter learns her father is spending large sums at hostess clubs. "Huh? You're paying that much? What a waste! Just give that money to me instead, haha!" she jokes, playfully negotiating with her flustered father. He responds, "Hmm? If I'm paying, why not? Sure, let's give it a try," and impulsively begins testing their compatibility. Though initially treating it as a transaction, the relationship between daughter and father gradually crosses the line, escalating further and further. Their emotions intensify, spiraling into an uncontrollable desire.