My mother-in-law is young and beautiful. But she seems to be acting strange only when my father is not around. One day, while cleaning her room, I noticed the antenna of a remote-controlled vibrator sticking out from her pants. It turned out she was cleaning while operating the vibrator! I got aroused by seeing my mother-in-law like that. When she found out, she said, "Let me-in-law help you with that," and started licking my penis!?