The Oda family's daughter had married and was preparing to welcome their first grandchild. While supporting her daughter who struggled with childcare, the son-in-law worked hard to keep up. Watching the couple warmly was mother Shiori. Their everyday family life seemed ordinary, until one night when the son-in-law appeared dejected in the living room. When Shiori approached him, he confessed that he had been repeatedly rejected for sex due to the exhaustion of parenting, and his patience had reached its limit. Seeing the usually cheerful man burdened with such deep distress, Shiori's heart ached. Whispering "I'm sorry, my daughter," Shiori gently comforted his groin. From that day on, Shiori's gaze toward her son-in-law changed. Then one night, Shiori was penetrated by him, finally accepting him completely. After so long without intimacy, Shiori reached climax multiple times.