A Secret Shame

I've been working as a barista for over five years now, and I thought I knew everything about my job. But recently, something has changed. For the past few weeks, whenever I serve my coffee daddy, a man in his late thirties who visits every morning, he treats me like a little girl. He calls me pet names, makes demands that I carry out obediently, and sometimes even tells me off playfully. It started as a game, something to make our mornings more fun, but it's becoming harder for me to keep this roleplay confined to the café. There are moments when I feel truly childish in his presence, like all my responsibilities melt away when he gives me instructions or praise. I'm not sure how to react to these feelings, I'm still independent and capable, yet there’s a part of me that enjoys feeling cared for in such an unusual way. Am I the only one who experiences this kind of dynamic with a customer? Should I stop this game before it gets out of hand?