Yasuhiro, the son, accidentally witnessed his mother masturbating one night six months ago. Ever since that night, he has secretly watched from the shadows as his mother opens her legs every evening. As this continued, sexual feelings toward his mother began to grow within him. The mother, growing increasingly unable to suppress her desires with age, one day began pleasuring herself while whispering her son's name. Her sensual, voluptuous body movements overwhelmed him, leaving him breathless and drawing him even deeper toward her.