Akira can't stop masturbating with his mother Yurika's underwear. This turns his perverted mother on, and she soaks her son's underwear with her scent, inciting him to masturbate even more. Unable to stop masturbating herself, and wanting to do something even more obscene, Yurika finds herself looking for participants for a project. The project is a "Room You Can't Leave Unless You Ejaculate 10 Times" by the adult video maker Dasu!...