I've been married to Naoki for two years and wanting to have a child soon, so I've been researching when it's likely to get pregnant from the day of ovulation, and working hard to have a baby. Tonight is that day. However, Naoki brought in a friend Oki, who had come nearby on a business trip. I never noticed Oki's sharp expression. And the next day, I was called out to by Oki and fucked. Even though it was a dangerous day, Oki started visiting me every month when I was on business trips. It's always a "dangerous day" at that time...