Chisato felt guilty for her infidelity, which led to her daughter being raised in a single-parent household. Therefore, when her daughter got married, she resolutely decided to do whatever it took to support and protect her daughter's family. However, the consultation she received from her son-in-law was about suspicions of her daughter's affair... She had to avoid divorce at all costs. Chisato, with this single-minded determination, performed oral sex on her son-in-law. She would relieve him in place of her daughter. This was Chisato's way of making amends and indirectly protecting her daughter's family.
