I need to think about the plot structure. It could start with Ryuu moving in with his stepmother after his father's death or a divorce. There's tension as she starts to show interest in him, which could be mutual or one-sided. The story might explore Ryuu's internal conflict between duty and his desires. There could be moments of resistance, then eventual submission, followed by consequences. The "Menuruti Hasrat Cabul" part suggests that Ryuu gives in to his stepmother's perverted desires.