My father-in-law, who had been missing for some time, suddenly showed up at the house I share with my husband. My father-in-law had left home when my husband was a child, so the two of us didn't get along very well... I had mixed feelings, but what bothered me more than anything was that I wasn't satisfied with sex with my husband. After having sex with him, I would go for a run to release my unfulfilled desires. However, one afternoon when neither my husband nor my father-in-law were home, I reached my limit and started masturbating, but my father-in-law happened to come home and saw me...