The husband was drunk and did not know that his wife was having sex with her father-in-law

It's been half a year since I got married in an arranged marriage and married into the Shusuke family. I heard that it's difficult to live together, but I'm lucky to have my in-laws who treat me like their own daughter, and my newlywed life is very happy. I grew up in a family with only one mother, and I am a bit of a father, so I am especially happy and confident in the presence of my father-in-law. …It happened right after that.