My wife's sister comes over for the weekend often. She teases me by leaving her panties lying around. After the wife goes to bed, she sneaks down and gets next to me on the couch. She then gives me the best oral sex I've ever had in my life. She takes her panties off, puts them on my head, and covers my face with them. Only then, will she finish what she started. When we are done, she makes me wear the panties to bed and will check on Sunday to see if I still have them on. I love having oral sex with her; I've never ever it even half as good from anyone else. I love wearing her satin panties too. I think my wife knows, but I am not going to ruin it by telling her anything.