Caught in a Kink Trap

I'm nonbinary and married to Sarah, who's been my partner for the past four years. We have a good relationship with a healthy dose of openness about our kinks and desires. Recently, I've started exploring this new dynamic that feels both exhilarating and terrifying at the same time. It involves role-playing scenarios where Sarah takes on an authoritative role over me, essentially playing out a dominant/submissive power exchange. The idea first came to me while reading about it online. As someone who values independence and self-determination, I found it intriguing how these dynamics can create an intense feeling of liberation even as they involve giving up control. The concept felt both foreign yet strangely appealing, so I broached the topic with Sarah cautiously. She initially seemed interested but hesitant, which made me wary. I didn't want to push her too hard into something she wasn’t entirely comfortable with. However, a few weeks ago, after we had an unusually intense session of cuddling and pillow talk, Sarah suddenly turned serious. She mentioned that she had been thinking about this dynamic quite a bit since our last conversation. To my surprise, she wanted to dive right in, not waiting for me to feel completely ready. This sudden shift left me both excited and anxious. We started small with some playful teasing and light role-play games at home. It was enjoyable but also made me question whether I truly felt secure enough to let go of control even this much. Over the past month, Sarah has been increasingly eager to explore more explicit scenes. She's convinced that these sessions make her feel closer to me, which is wonderful for our relationship, yet it feels like there’s a part of me holding back. The issue comes down to whether I’m truly okay with this newfound dynamic or if I'm just going along with Sarah because she seems so enthusiastic about it. I want to be supportive but also honest about my boundaries and needs, which feel conflicted right now. Am I being unreasonable by not fully embracing something that might deepen our intimacy? Or is there a way to honor my reservations without undermining the positive changes we've made? I need some guidance here, how do you navigate a scenario where both partners are excited but one isn't entirely sure yet? Is it normal to experience this kind of uncertainty when exploring new aspects of your relationship?