A son witnesses his mother sleeping while waiting for his husband to come home after working overtime. "Mom, you must be tired... I wonder if there's anything I can do for you..." Later, the son borrows a massage tool from a friend and gives his mother a massage. "It feels good... you're good at it," says the son, delighted by his mother's smile. However, as he feels another person touching his skin for the first time in a long time, his mother's voice changes to a sultry sigh, different from the one he had heard at first, and the son's hand reaches for her crotch as if drawn to it...