Hikaru's husband works in his father's company. Father-in-law has long coveted a beautiful daughter-in-law with extremely big breasts. Today, when his father-in-law finds out that his son has embezzled the company's money, he immediately comes up with the idea of threatening Hikaru and making her work as his secretary. But not only doing the work of an ordinary secretary, Hikaru has to help his father-in-law relieve stress by... let him fuck! From then on, Hikaru had to let her father-in-law fuck whenever and wherever he wanted, even if her husband was right next to her!