SPRD-1031 - Caught my daughter-in-law cheating, now I'm the one taking care of her

The story is about a son trying to satisfy his wife's desires so she won't leave him. After nearly an hour of back-and-forth, the first act ends with her having passionate sex with her husband, and after going three rounds and getting completely worked up, she says, 'I actually prefer my father-in-law.' The script is a total mess. Since the father-in-law, wife, and husband are all portrayed as 'good people' with no malice, there's absolutely no spice of immorality—it's just a series of acts. Still, the intense climax with Toru Ozawa was incredibly erotic. It's a 4-star film worth watching just for the last 40 minutes.