KEED-078 While the daughter was away, her boyfriend forcibly had sex inside her mother, causing the mother to become aroused. The mother is Yukoko Shiraki.

I never thought I'd be attacked by my daughter's boyfriend… I struggled desperately, but there was no way to resist the strength of a young man. Yuko was helplessly penetrated and left inseminated. More shocking than being raped was the fact that I had betrayed my daughter. Yuko decided to keep this incident a secret so as not to hurt her daughter. But since that day, her body, which had experienced the pleasure of being penetrated by a young cock, would heat up and become wet just from making eye contact with her daughter's boyfriend who came to play.