I am a creepy photographer.

No, really. I pity my younger sister. She is the closest thing I have to a "muse", so of course when I need a model for a picture, I turn to her. Which means that I try to control absolutely everything she does in the shot. "Remember, you need to feel like ngh." "Imagine that you're bossing around a penguin." "Knees down, hips up, lean back, chin down." 
I guess she's used to it, but I think it's creepy.