My son's wife is a little frustrated with her sex life with her son, and I think she's casually showing me her panties and inviting me. My son's wife seems to be getting even more excited when she sees my cock, which is hard despite my age, so I rubbed my cock against her ass while my son and wife were not looking, and it ignited. The two of us can't control our arousal because we're in a relationship where we shouldn't touch each other.