Yuta is at his friend Kosuke's house to watch porn movies, but his private party is interrupted by Shiori, Kosuke's mother, who was not supposed to be home that day. Later, Shiori slips down the stairs but is saved by Yuta, who injures both arms in the process. Feeling guilty for what happened to her son's friend, Shiori takes care of Yuta until his arms heal. She not only pampers him and feeds him but also takes care of his sexual desires.

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