My wife's younger sister who is 19 came to stay with us. So last week I noticed movements anytime my wife is moaning and got to find out it's her sister who normally comes to peep through the key hole. So from three days back, I started leaving the door slightly open and position my wife in a way that her sis can now see my thing going in and out. I'm nervous to tell my wife but Its exciting for me. I just wish my wife would like what I'm thinking. I still don't want to risk it and jeopardize my marriage. Pls advise me.