We are a newlywed couple, married one month ago. My wife Mayu is a wonderful woman, cute and cheerful, the perfect match for my gloomy personality. Today is her birthday. I am currently working away from home, and I really wanted to celebrate with her, so I came home from a business trip with a cake in hand. As I was waiting for her as a surprise, I secretly returned home, and my wife came home with my boss. I instinctively hid under the bed, and after that...I had an experience so shocking that it made me depressed.