Riho is an elite tutor hired for her son's stupid son. Her son tells her that he is too frustrated to study, so she gives him handjobs and blowjobs to improve his grades. After being fucked by her father and discovering her secret masochistic tendencies, Riho rewards him with a cumshot in her mouth during dog play. Riho discovers that she has a talent for using her pussy rather than teaching him how to study, and begins giving pussy lessons to her son and his friends...