Trying to Understand My Daddy Kink

I've been working as a personal trainer for over ten years now. I'm 39 and have always prided myself on being professional and business-like with my clients, never crossing any lines or allowing relationships to become too personal. Yet recently, I've found myself developing this odd desire... this Daddy kink if you will. When I train a client who is younger than me, sometimes considerably younger, I find myself wanting to take on more of an authority role, guiding them not just physically but mentally and emotionally as well. It's confusing because I'm not usually the type to be drawn into such dynamics, let alone something so specific like this Daddy thing. What intrigues me most is why it appeals to me now. Is it simply a matter of finding fulfillment in helping others grow? Or could there be something deeper going on here that I need to confront and understand for myself? Have you experienced anything similar or found any insights worth sharing?