"I'm so sorry to show you this embarrassing sight... To be having sex with my son and feeling it... I'm a failure as a mother... no... as a human being... This is all my fault..."
After her husband's third death anniversary, Fumino started living with her son and his wife. She got along well with her working son and his wife by doing housework, but the loneliness of her husband's absence made Fumino's body ache. She would masturbate daily to distract herself from this pain. One night, while she was masturbating to relieve her aching body, her son caught her. Just as she reached climax from self-pleasure, her son appeared and forcefully inserted his hot erect penis into Fumino's resisting body. Although it was forced, Fumino eventually gave in and continued to engage with her son as he demanded. Gradually, Fumino began to crave her son's touch. At this time, something strange happened to Fumino's body. Her period came. Feeling like she had reached the end as a woman, Fumino told her son about it and tried to end their relationship...
"My period stopping has made us sink even deeper into this forbidden swamp..."