Kyubei and Ami have been married for two years, but still have no children. My parents-in-law were eager to meet their grandchildren, so they thought of a way. It was for Kyubei to refrain for a month, and to conceive Ami on the family's hot spring trip. During this month, Kyubei had to struggle to suppress her sexual desire. Finally, the day when the whole family traveled together came. As soon as she arrived, Kyubei wanted to let go of all the desires that had been accumulated for a month. But because he hadn't had sex for a long time, Ami felt pain and insisted on not letting him fuck. While losing her mind, Kyubei sees her mother's perfect body again. Unable to control himself, he rushed to fuck his mother-in-law and impregnate her. Although she constantly resisted at first, her son-in-law's huge cock and youthful strength made Sayuri more and more infatuated with sex. In the end, she let herself go, took the initiative to enjoy sexual pleasure with her son-in-law, let him conceive her over and over again...