Riho is an elite tutor hired for her stupid son. Riho, who was told by her son that she is in agony and unable to study, treats her with hand jobs and blowjobs in order to improve her grades. Riho's secret masochistic temperament was discovered when her father fucked her, and he rewarded her with doggy play by ejaculating in her mouth. Having discovered her talent for using her pussy rather than teaching her studies, Riho's pussy class begins with her son and his girlfriend's friend...