Her long-missing father-in-law suddenly appears at the house she shares with her husband. He abandoned the family when her husband was young, so the two men can barely stand each other. She has mixed feelings about his return, but her biggest problem is still how unsatisfied her husband leaves her in bed. She usually goes running after sex to burn off the frustration. Then one afternoon, while both men are away, she finally gives in and masturbates—only for her father-in-law to come home and catch her in the act...