Just got married last June and my wife and I are living with my in-laws so we can save enough to by a house. We use my wife’s old bedroom and share a bathroom with her younger sister. I think it’s called a Jack and Jill bathroom, in between our room and her sisters. Its a large bathroom with twin sinks, a toilet and large shower stall. The sinks have a wrap around mirror. The doors from the two bedrooms are on an angle because they are next to cloths closets.

It was in August that I first became aware that her sister Marissa was watching me shower. The molding on the door knob side of her door must be loose and she can see right into the bathroom. She must be able to pry it open when she wants to and if she isn’t in her room the opening isn’t visible anymore. Marissa is only 14 and it seems she is always doing her homework in her room when I shower in the evenings. I’m 23 and have sex often with my wife but I can’t help getting aroused when I know Marissa can see me nude. I actually have no reason to masturbate but knowing I’m being watched has me doing it a few times a week. I know this won’t end well because Marissa will my sister-in-law for many years to come. I keep telling myself to confront her or at least tell my wife but I never do, letting it continue. The truth is that it excites me so much I get an instant erection. I always make sure the door is locked but know for sure when she is looking in.

It doesn’t happen often but there have been quite a few times my wife and I shower together. Its usually when her parents are out but lots of times Marissa is home. I am positive she has watched my wife and I shower together and yet I still never say anything. We have had sex in the shower and have played with each other at a minimum. I shamefully am aroused knowing Marissa is watching us yet know my wife would be furious and embarrassed if she knew. For the last few months I have also jerked off outside the shower closer to Marissa’s door to more closely expose myself. We will probably move out within the next year but this is a situation both Marissa and I will never forget about. Its something I’ll have to deny I ever knew about the rest of my life. Marissa is at fault for watching me all the time but I have never tried to stop it. She will always remember me naked, seeing me jerking off and someday I feel I will regret it. I see and talk to Marissa almost everyday with both of us acting like nothing is happening in the evenings. I’m pretending I don’t know she is watching me and she never shows any signs of guilt for doing it. It will have to stay that way forever.