A Detached Dilemma

My partner and I have been together for six years. We're both in our thirties now and we've always kept things casual, even when it felt serious. Recently, there's a new wrinkle: he started expressing interest in trying out CNC scenarios, consensual non-consent roleplays that push the boundaries of trust and power dynamics. It makes me feel strange; on one hand, I understand the allure of stepping into roles where you can explore desires safely within predefined limits. On the other hand, there's a part of me that worries about what it might do to our relationship in real life, will these games start bleeding over into how we see each other outside the bedroom? I find myself wondering if this is just another phase or if it means something more profound about us and where we're headed. Has anyone else experienced something like this? Is it normal for couples to maintain a casual relationship but still delve into deeper, riskier territory in their sex life? What's your take on balancing such intense roleplay with keeping things light-hearted overall?