OBA-047 Incest Takashi, sorry for being a perverted mom... Bamboo Under Thousand Crystal.

Chiaki raised her only son, Takashi, on her own. She was sometimes kind and sometimes strict. Chiaki treated Takashi as her virtuous "mother", and Takashi also respected her. However, such a mother-child relationship will crumble. "Her mother has a girlfriend." A few days after Takashi's remark, Chiaki witnesses Takashi and her lover having sex at her home. Seeing her son's penis and her lover's vagina rub against each other, Chiaki's "woman" awakens...