After sex with her husband, sae masturbates. Seeing this, the man, thinking she was unsatisfied with their sex, vents his sexual desires onto sae. Watching his wife's face twist in pleasure, the man has an idea. He wants to love his wife more. If he awakens her masochistic side, they can love each other even more. With this thought, the man entrusts his wife to a trainer at an SM club...