The daughter-in-law was helping out at her father-in-law's chiropractic clinic. Although the father-in-law worried about his son and daughter-in-law not getting along, he eventually started seeing his daughter-in-law as a woman, and his desires were ignited. He would play tricks on his voluptuous daughter-in-law or conspire with regular customers to rape her. After being raped by her father-in-law, the daughter-in-law's female hormones surged, causing her to demand more from her husband, but her body had already transformed in a way that she could not forget her father-in-law.
