Adult performers portray this forbidden mother-and-son role-play. Eri is stunned to learn that her grown son is still a virgin just days before his wedding. Although he has dated women before, he admits that he has never had sex. Worried that his inexperience could ruin his marriage, Eri decides there is only one solution: use her own body to teach him everything from the beginning and give him some hands-on experience before the ceremony.