Confession of an Inexperienced Domme

I've been dating my partner, Alex, for about a year now. We started exploring different aspects of our sexuality and discovered that I have this deep desire to be the dominant figure in certain situations. It's something I've always felt but was never brave enough to act on until recently. We talked extensively before we started, laying down ground rules and ensuring both of us are comfortable with what we're doing. One thing Alex mentioned early on that intrigued me is their interest in age play, being treated as if they were younger than they actually are. I agreed because it felt like an exciting challenge to balance my dominant desires with something new. The first time, I dressed up and created a space that felt like a classroom setup in our apartment. It was just the two of us, nothing too elaborate or fancy at first. As soon as Alex walked into the room, there was this immediate change in their demeanor; they were playful yet somewhat nervous, much like someone new to something. I tried to maintain an authoritative tone while still making sure it wasn't overbearing. I gave them tasks that felt more childlike and asked them questions about subjects one might expect a student to answer easily. The physical aspects of our session were surprisingly natural once we got into the rhythm, the intimacy was there, just under this playful guise. We used toys that weren’t overly invasive but added an element of excitement without crossing into discomfort for Alex. There were moments where I had to remind myself it wasn't real, Alex isn't actually younger than 18+, as is necessary for these kinds of roles, and that the dynamic was consensual and just role-play. As we progressed, things started getting more intense physically between us. I found myself being much more open with my desires within the confines of this setup. There were times when it felt like a real power exchange rather than a mutual exploration, times where my dominant nature could’ve been too aggressive if not for Alex’s guidance and reassurance. Now, here's what bothers me: how do I balance maintaining control while still being considerate and respecting boundaries? How far is too far in exploring this dynamic, especially given that it involves playing pretend with ages? Am I crossing a line by indulging in these fantasies or am I simply taking another step forward in understanding my partner better? What would you guys do in my situation?