A night alone with my wife's best friend

A stormy night hit by a typhoon. The Sakamoto couple, along with their wife's colleague Eriko, were to hold a dinner party together. However, the transportation system was suspended and my wife was unable to return from her workplace, and by chance Eriko, who had come nearby to go to business, came wet. Before marrying his wife, the husband had a crush on Eriko, but he couldn't contain his heart pounding as he spent time alone with her. The storm not only subsides, but it becomes even more intense, and the sound of the rain gradually narrows as the two of them grow stronger...