My Secret BDSM Fantasies With My Partner

I'm in my mid-20s and have been with my girlfriend for about two years now. Our relationship is great; we're both supportive of each other, trust each other implicitly, and have a lot of fun together. But lately, there's something I've been harboring that feels like it's gnawing at me from the inside. It started when she surprised me with a birthday gift, some bondage gear. She was playful about it, but as we talked more about it over the next few weeks, her interest in BDSM became clear to me. It wasn't something I had considered before meeting her, and now finding out about this aspect of her turned me on way more than I expected. The first time she suggested tying me up during sex was unexpected, but as soon as she started, it felt incredibly hot and intense. The power dynamic flipped in a way that made my heart race and my body tingle. She asked if I wanted to try topping for once, something she knew about from her past experiences. The thought of being the dominant partner left me breathless. We tried switching roles and playing with different scenarios, but there's this one fantasy I've had where I take on a more controlling role in our relationship outside of the bedroom too. It’s the idea of having power over her beyond just during sex play. I know we're both adults here and everything would be consensual, but it feels like an abuse of my newfound confidence. I haven't told her about these thoughts because I don't want to push or pressure her in any way. But they keep coming back, and I can feel them growing inside me. I'm worried that if I act on them, even as just a roleplay, it might damage the trust we've built. So here's where I am now: I'm confused by my newfound desires and how much control and power over someone else excites me in a consensual playroom setting. It feels like an infidelity of sorts within our relationship dynamics, even though there's no real betrayal intended or acted upon.