Ayano, a mother who takes care of her son-in-law, Takao, on behalf of her daughter who left home for an overseas assignment. It was fun to live with my son-in-law, but I couldn't bring my boyfriend and sometimes I was in agony. One day, after a long absence, I got excited on the phone with my boyfriend and started masturbating over the phone. Moreover, Takao who came home by chance peeped at the situation ... Takao, who couldn't control his desires because of his mother-in-law's foolery that he saw for the first time, came up with a plan and put it into practice, trying to take advantage of his ripe body.