Yusuke has been living alone for a while on a long-term business trip with his wife, Kaori. - Her mother-in-law, Sayako, who was asked by Kaori to take care of him, visited there. - Unlike her wife, who is full of her work, Yusuke, who has been lustful for her homely enveloping kindness and her mature body, asks her for her sexual treatment ... .. - Unable to suppress her son-in-laws stubborn cock, Sayako made him ejaculate to be swept away. - However, her aching body for pleasure breaks her reason and easily crosses the forbidden line ...