Years ago when my ex wife and I went out , my wifes younger sister , who was 17 at the time would babysit for us . Every time we came back to the apartment , I noticed that some things were moved around . I thought she was snoopin , but I didn't say anything to my wife . The next time she came over , I set a trap . I took a couple of my best BIG TIT magazines and placed them on the floor , sticking out just a little , from under the bed . After we got back to the apartment and when my wife left to take her sister home , I went into the bedroom to check on the magazines . I could tell they were moved . I quickly picked them up and went to the bathroom and dropped my pants . As I was jerking my cock and looking at the magazines , all I could think about was that my wifes younger sister also saw the pics , of big saggy tits . Over time I left a few other adult magazines out for her to peek at . And I did a lot of jerking off.