Playing the Teacher's Pet Too Literally...

So I'm in my late 20s and in an open relationship with Alex. We've been together for about two years now, but this past month has been... interesting to say the least. Alex and I are both working professionals, but we met through a mutual interest in online roleplay communities. It's not like those things take over our lives or anything; it’s just something fun that happens once in a while. Anyway, recently Alex got into this weird fantasy involving me... being their student and them playing the teacher. It started as harmless stuff on the phone, just some light teasing and role-playing around homework assignments and after-school detention jokes. But then it escalated to more explicit scenarios where I’m supposed to be their obedient pupil... doing things that aren't really school-related at all. You know, like studying late night study sessions that get a little too heated. I’ve always been Alex’s older partner by a few years, but this new fantasy turns the dynamic around and puts me in the submissive position for once. It feels kinda weird, honestly, being on the receiving end of... let's say “guidance” that goes beyond just learning algebra. But I’m also finding it thrilling... The problem is, when we’re not in roleplay mode, Alex has started talking about our real-life relationship with this new lens. They've mentioned wanting to try out some more controlling dynamics in our actual partnership. Like, having me submit a 'report card' on my personal and professional life... or making decisions for me as if I were truly their pupil. I’m not sure how much of it is just roleplay bleed into reality versus Alex actually wanting something different from the relationship we’ve had up until now. It’s confusing, because part of me enjoys this fantasy so much that I don’t want to feel like a hypocrite by shutting it down... But at the same time, do I really want to be in an actual power dynamic where one person always makes the rules and calls the shots? Especially when it's someone who’s usually my equal partner? So... what should I do? Is this just a phase that will pass once we move past our current roleplay craze? Or is this something that could really change the nature of how we operate in real life? It feels like a tricky line to navigate without losing my sense of self or autonomy. Any advice out there for someone who's flirting with an age-gap and power dynamics but isn't sure if it’s healthy? ...