A Slippery Slope in the Legal World

I'm in my first year of law school and things are going pretty well, I've got good grades and a great relationship with my partner. We’ve been together for over a year now, but lately there's this thing that keeps creeping up on me like it’s not okay, even though we’re both adults. It started small, just watching some kink content online when she was out of town last month, which I knew could lead to something. A few nights ago, we were at home alone and a friend sent her a naughty video over text; she showed me right away and I thought 'why not?'. We watched it together and then started playing along with the scenes in the video, just for fun. It was more intense than anything else we've done before, there was this moment where I felt like I crossed a line into a territory that feels taboo but is still consensual between us. I know it's not really illegal or against any rules in our relationship; she’s okay with everything, and so am I. But there’s a part of me that wonders if we should have more boundaries, because sometimes these fantasies feel like they're leading somewhere darker than I'm comfortable with. Maybe I need to think about what this means for us as a couple long-term or whether it's just something I shouldn't indulge in anymore. Either way, talking about it hasn’t come up yet and I’m not sure how she’d react if the conversation did happen.