A married woman visits a hot spring resort famed for helping couples conceive, hoping to boost her chances of pregnancy. While receiving a relaxing massage to enhance fertility, she lifts her yukata to encounter an unbelievably busty masseuse. As the oil massage carefully stimulates her erogenous zones, her sensitive body reacts with intense twitches, clearly showing her rising female hormones. Despite the risk of her husband finding out, her pleasure deepens uncontrollably, and she can't suppress her moans. Overcome with shame, nearly in tears at the thought of being with someone other than her husband, she still ends up having unprotected sex with the masseuse. As the masseuse whispers, "Don't hit my uterus," her enormous breasts sway violently with each vigorous movement. Overwhelmed by the intense pleasure, she can no longer hold back her cries, leading to the strange and unexpected event of conceiving a child with the masseuse.