A motherless family with one mother and one child. Reiko has forgotten being a woman and worked to raise her son. But now that her hard work is paying off, her tense heart loosens and her suppressed desires overflow. Her trigger was that her son's hand, which was rubbing her shoulder, touched his nipple. In reaction to her ascetic life, she has awakened to a super sensitive constitution that makes her immediately orgasm just by touching her nipples. Reiko impulsively crosses her forbidden line with her son, and the next day she exposes her breasts and heads to her company with no bra.
