I can't stop spying on my stepsister every time she showers

And I'm not surprised. Sharing a house with a girl like that must be more of a problem than a blessing. I'm speaking sarcastically, obviously. I don't want to think what it must be like if I had a stepsister like that. I'd be jerking off and spying on her all the time. Our friend is also lucky enough to be able to fuck her...!!