Tired of a cold and lifeless marriage, housewife Shiori finds her sexual desires growing stronger each day. Night after night, she pleases herself, yet her cravings only intensify, leaving her increasingly unsatisfied. Living next door is her son, a young man whose gentle dependence on her has made him a special presence in her life. One night, when he invites her to bathe together, Shiori begins tenderly washing his mature, muscular body, feeling herself enveloped by his warmth. As her hands brush against his throbbing cock, all her pent-up desires reach their breaking point, awakening a forbidden passion within her.