For the sake of giving birth at her parents' home, my wife returned to her hometown. I, on the other hand, was enjoying my long-overdue bachelor life, indulging in all sorts of freedoms. Then, without knowing whether she knew about my antics or not, my wife's younger sister came over. "Brother-in-law... aren't you trying to cheat on my sister?" she suddenly asked, hitting the nail on the head. I was too shaken to hide my surprise when she continued, "To ensure you don't cheat, I'll take care of things in her place..."