Chisato felt guilty about her daughter growing up in a single-parent household because of her affair. So when her daughter got married, she made a firm decision to do whatever it took to protect her family. But her stepson came to her for advice because he suspected her of having an affair... She had to avoid divorce at all costs. With that in mind, Chisato gave her stepson a blow job. She gave him a handjob on her daughter's behalf. That was Chisato's way of making amends, and ultimately protecting her daughter's family.