The reason her mother-in-law, who lived with them, left home was, surprisingly, her father-in-law's impotence... The two comforted her grieving father-in-law by working on exercises to improve his erection, but it didn't work and he became desperate. Unable to bear the sight, Serina gave him a groin massage, and her father-in-law's penis, which hadn't gotten hard no matter what she did, suddenly grew bigger and he had his first full erection in six years! "This might be the last erection of my life... Let me remember the joy of being a man just one last time!" her father-in-law pleaded desperately for her to insert himself into her, and Serina, feeling sorry for him, said, "I never want to see my father-in-law sad again..." and allowed him to have sex with her without her husband's knowledge...