Yuri, who married her long-separated husband, went on a trip with her distant stepson Takeshi to get closer. Takeshi, who had stayed in separate rooms, was caught peeping at Yuri and had an erection. This incident quickly brought the stepmother and son closer, turning their relationship into a romantic one. They couldn't control their desire for each other, engaging in unprotected sex and internal ejaculation, ultimately becoming too intimate...
