NSPS-599 - The forbidden relationship between a father-in-law and his daughter-in-law

Usually, in 'father-in-law and daughter-in-law' stories, the tension of the seduction or the power dynamic is the main draw. But in this one, they're already sleeping together from the very beginning. After that, they just keep having sex while hiding from the husband and mother-in-law. How is that any different from a standard amateur-style video? There's no point in using the 'father-in-law/daughter-in-law' setting at all. It was a total disappointment, but I'll give it a generous 2 stars for Mao Ito's acting.