It's been almost six months since I married Joe, who used to be my boss at work. At first glance, it seems like a happy life with everything I could want, but I had only two worries. One was that I was still on bad terms with Shiro, Joe's son from a previous marriage, who is currently a student preparing for college entrance exams. The other was that Joe and I didn't have great sexual chemistry. Although he's enthusiastic about having sex, I could never quite be satisfied, and I was left feeling sexually frustrated. However, my dissatisfied expressions and our boring sex... Shiro had been watching it all. Then, Shiro approached me with innocent lust and his erect cock, saying, "I wonder what would happen if I put mine in you, Kyoko-san, instead of my old man's..."