My sister-in-law seems shy but you can't imagine what she does to me

You have to admit that when the woman gets in the car with her brother-in-law she seems a little shy, a little timid and also with those glasses that make her look more serious than she really is... but friends, appearances are often very deceiving because what the shy woman does to her brother-in-law is something you really have to see, damn, what a bitch that shy sister-in-law is haha...