A son who hates his father's remarriage partner, Yuuki. He hits Yuuki with anger that he can't forget his real mother, and points out her small mistakes one by one. However, Yuuki begins to feel pleasure from her painful torture and bullying. One day, he finds out that his girlfriend's son saw the stains on his panties that had been made wet by the bullying. Her son abuses her as a ``lewd woman without a sense of chastity'' and thrusts a vibrator into her to make her walk like a dog.
