Yuuri, who was living a blissful married life, was troubled every day because she couldn't conceive. She learned about a fertility spa and decided to give it a try... The treatment there involved stimulating the depths of the vagina to enhance uterine function. As Yuuri was meticulously stimulated deep inside, her sensitivity increased, and she forgot about her husband, her primal instincts awakened, and she instinctively accepted the young, hard cock. Unaware that it was a cunning trap aimed at married women from the start, Yuuri became engrossed in the obscene fertility treatment.