Exploring Boundaries with a New Partner

I'm in an open relationship with Sarah, and we've always had very clear boundaries. She's not into sharing her physical intimacy beyond what we both consent to, but she recently suggested that we explore some CNC roleplay. We agreed on strict safe words and limits beforehand. Last night was our first session. I picked a character from a book that Sarah really enjoys, a more domineering type. She gave me explicit instructions about how she wanted things to go down, down to the exact words I should use and what kind of actions would be expected from her side. Everything had been planned meticulously. We went through the scenario slowly at first, with Sarah dictating when things were to proceed based on cues and triggers we had pre-agreed upon. It was intense but exhilarating for both of us, as everything felt so real yet consensual. She enjoyed having control over the narrative while also experiencing an immersive role-play dynamic. At one point in our script, my character was supposed to forcibly restrain her against a wall. In that moment, Sarah's eyes flashed with a raw intensity I've never seen before. We paused for a brief check-in, confirming she was okay and reiterating consent. She gave the signal to proceed once more, this time with an added emotional layer that left me both stunned and deeply affected. The session ended after about two hours, leaving us both breathless and contemplating our experience. It wasn't just about the physical sensations; it was about understanding each other's desires in ways we hadn't before. As adults, we felt empowered by this exploration of boundaries and trust.