I don't see any reason to feel bad about harmless fantasies. Our thoughts are our own, and thoughts don't hurt anyone. Certainly, I've never felt guilty about the hot, hard, fast, sweaty, naked, dirty, filthy sex fantasies I've had about my T as all professional composure slips away from her involuntarily and she looks up at me pleadingly and hungrily as we proceed to.... wait, what were we talking about again?