Yuta goes to his friend Kosuke's house to watch porn as usual, but their private viewing is unexpectedly interrupted by Shiori, Kosuke's mother, who wasn't supposed to be home that day. Later, Shiori slips on the stairs and is rescued by Yuta, injuring both of her arms. Feeling guilty for what happened to her son's friend, Shiori decides to take care of Yuta until his hands heal. She not only spoils and feeds him, but also satisfies his sexual desires.

After Shiori masturbates Yuta-kun with her beautiful, mature body, her lust awakens and she can't stop thinking about having real sex with him.