Struggling With My Kink and My Partner's Limits

I'm a grad student trying to balance school, work, and my relationship. My partner is incredibly supportive of me in all these areas, but there's this one thing that I just can't talk about without feeling like a burden or an asshole. You see, I have this kink, it involves exploring power dynamics through roleplay scenarios where dominance plays a significant part. It’s something I've wanted to try for quite some time now and it makes me feel alive in a way nothing else does. I broached the topic with my partner last year, gently at first, but it's clear they're not comfortable with it. They’ve told me that while they respect my desires and want to support me, this particular aspect is just too intense for them. We compromised by finding other ways to keep things exciting in our relationship, but every so often, I find myself wanting more. Tonight was one of those nights. As we cuddled up on the couch after a long day at work and school, my mind kept wandering back to these fantasies. The way certain characters assert themselves in books or movies, the power struggles depicted, they all reminded me of this kink I have. It’s like there’s a switch inside me that flips whenever something triggers it. I know my partner respects boundaries and personal limits, but sometimes I wonder if I should push them to explore this side with me. Would it be fair to want more from them when they’ve already shown incredible support? Am I being selfish for not wanting to give up on this aspect of myself? So here’s the question: Should I continue to keep my fantasies to myself, or is there a way to bring this into our relationship without crossing any lines and upsetting the balance we've worked so hard to maintain? What advice do you have for someone like me who wants to honor their partner's limits while also trying to satisfy a part of themselves that feels unresolved? I'd really appreciate hearing your thoughts.