Analyzing Curiosity's Edge

I've been with my partner for over two decades now. We have a solid dynamic that suits us well. But recently, I found myself intrigued by the concept of CNC roleplay. It was something so outside our usual comfort zone and ethical boundaries. The idea itself felt both thrilling and deeply unsettling, a paradoxical pull towards exploring what's forbidden. Why does this curiosity persist? How do others reconcile such fantasies within their relationships? Your thoughts?