After two years of marriage, my wife became pregnant. The embarrassment was also severe, and I was not in a state where I could have sex. Still, while my libido was building up, I was always horny. Meanwhile, a couple moved in next door. His wife was young, beautiful, and strangely sexy... my heart was pounding. My wife, who was tired of being busy with housework at work, invited me to eat... I made a mistake.