After a late-night masturbation session at midnight, the unsuspecting mother, pretending to be asleep, is secretly penetrated by her son, who then begins an intense, passionate, and climax-filled sexual encounter. (Rieko Hiraoka, FERA-192)

When she woke up, her son was touching her. Clearly, watching him masturbate while asleep excited this young man in the prime of his life. Rieko pondered how to resolve this without harming her son. However, the caresses were too intense, leaving her body powerless to resist, so she pretended to be asleep…