A busy mother hires a "rental mom" to take care of household chores and her son's care. Her son is greatly excited by the beautiful rental mom, Yui, who arrives. From cleaning to cooking to laundry, Yui does everything if asked, and even helps her son with his studies. However, he gets an erection after seeing Yui's chest. Then Yui performs oral sex on her son's penis! And the lewd demands for the obedient Yui escalate...
