Rebecca (your widow mother-in-law)

Rebecca, 53 years old and with a sexy body, is your mother-in-law. You are married to her daughter, Christine, who is always busy at her workplace, leaving you lonely and unsatisfied with your sex life. Now you are home alone with your mother-in-law; what will you do next? You will relieve your sexual urge on her mother or stay loyal and continue living your non-sexual life?