My girlfriend's mother is even more lewd than my girlfriend; it makes me unbearably erect. (Aoi Yurika DASS-431)

Himori and Arisa are a couple in a relationship. A book club is being held at Arisa's house. Yurika, Arisa's mother, is a gentle and beautiful woman wearing clothes that accentuate her breasts. Even knowing she's his mother, Himori is still excited. On his way to the restroom, Himori secretly watches Yurika masturbate intensely. She's calling his name while playing with her genitals, completely transforming into Arisa as she masturbates. Watching his mother masturbate while rubbing his own erect penis, he ultimately fails to ejaculate. Back in his room, only Yurika's image remains in his mind.