My mother-in-law, Maki, has been living with me for the past two weeks, where I live with my pregnant wife. I thought my wife's mood would improve thanks to my mother-in-law, but she started treating me even worse than before, and even banned me from masturbating. A few days later, it seems Maki had heard our argument, and, feeling guilty, offered to take my wife's place. I had to weigh my reason against my sexual desire, and I gave in to temptation and my pent-up desire, and from that day on, I began my creampie life with Maki...