My Secret Sin

I'm forty-five and a married man, and lately I've been thinking about this weird fantasy that really freaks me out. What if my wife is actually like a naughty kid who needs guidance from a real Daddy? Last night, she was acting all playful but disrespectful too, I found myself getting mad in a way that felt wrong, but also kind of exciting... I put her to bed early and gave her a timeout, just because it made me feel oddly powerful. Is this okay? Am I sick for thinking about my wife like a child who needs discipline from someone older? Should I tell her what's going on inside my head?