Nana Aida ended up with a husband who was impotent, so every night their intimate life was unsatisfactory, and she could only resort to masturbation daily for self-satisfaction. This situation was accidentally discovered by the neighbor, who had noticed her for a long time but couldn’t do anything since he was close with the neighbor's wife. But now, it seems the opportunity has come for him; he can help his neighbor's wife without needing to repay any favor :D.