After his wife, Kaoru, went on a long business trip, Yuusuke found himself living alone for a while. Then, his mother-in-law, Sayako, who had been asked by Kaoru to take care of him, visited. Unlike his workaholic wife, the homely Sayako's enveloping kindness and mature body aroused Yuusuke, leading him to ask her for sexual release. Unable to resist the excitement from her son-in-law's stiff penis, Sayako could only let him ejaculate. However, her body craving pleasure destroyed her reason, easily crossing the forbidden line...
