Three years have passed since Yoko's divorce from her husband, and she is single-handedly raising her only son, Atsushi. Just when she is reaching her limit, one day, Atsushi's friend Ken, who lives next door, comes over to their house. Ken borrows Atsushi's pants because he is "hot and sweaty," and Yoko gasps when she sees his crotch. (They're... big!!) Ken's huge dick is too much of a stimulus for Yoko, who has been deprived of a man, and she takes an action without thinking...