Kana, who had to live with her daughter and her husband, was worried about the frustration caused by her husband's assignment. At that time, she finds out that her son-in-law, Taichi, also has no sex and is masturbating every night... Kana was captivated by his gigantic dick and tried to force him to do something for her daughter. Taichi can no longer resist his girlfriend's stepmother's bold temptations.