Navigating My Kink With My Daughter's Daddy

I'm a trans woman in my early 30s who recently got involved with the mother of my daughter. We've been together for about three years, and she loves the idea of me being her daughter's mommy. It’s a role I’ve always enjoyed playing, even before this relationship started. We have an open dynamic where we explore different kinks and fetishes. One particular scenario that has emerged involves age-play and a discipline element. Sometimes when he feels like our bond needs a bit of tightening or redirection, it turns into something more intimate and playful. I enjoy being on the receiving end of this discipline. But here's the thing, whenever we do these sessions, there’s always this lingering question in my mind: is there a line somewhere? He respects me as an adult woman, but sometimes his character slips into a mindset that could be interpreted as overly authoritative or controlling outside our playtime. We've talked about it; he assures me that I’m the one who initiates and maintains control over these scenes. I'm confused. Part of me loves the idea of letting go and being disciplined in this way, especially because it's rooted in love and care. Yet another part of me worries about crossing into something unhealthy or problematic, especially with the mommy-daughter dynamic that’s very meaningful to us both. So my question is, are these feelings normal? Should I be more worried about his underlying psychology than our mutual enjoyment? Or am I just overthinking this?