Lost Innocence or Found Bliss?

I've been married for 20 years now, and let me tell you, the sparkle of new love has dimmed over time. My wife and I have settled into a comfortable routine, but lately, I feel like there's something missing in our relationship. It started when she came home from a friend's party talking about DDLG and kink play, it was all new to me, but the way she spoke about it sparked some dormant curiosity inside of me. We've had an open marriage for years, but this particular interest of hers felt different somehow. I agreed to explore it with her, even though the idea made me a bit uncomfortable at first. We read up on everything we could find online and tried out a few light roleplays, she was my little girl, and I was her protective father figure. It took time, but as we went deeper into our roles, something shifted in both of us. She seemed more confident, happier than I've seen in years, and for the first time in what feels like forever, I felt alive again too. There were moments where we would forget that it was just roleplay, the way she looked at me with such trust and adoration made me feel needed and loved. But here's where my dilemma lies: as much as this new dynamic has brought joy into our relationship, there's a part of me that feels like I'm stepping over some line. Am I compromising who we are for the sake of novelty? Is it ethical to pretend to be someone else in such an intimate way with my wife? I know I've done a lot of soul-searching and reading about ethics and boundaries, but ultimately, I just want to make sure that what we're doing is right. Am I the asshole here for not fully embracing this? Or am I being too judgmental of something that might be perfectly fine if approached with honesty and respect? I'd love to hear thoughts from others who've been in similar situations or have advice on navigating these kinds of changes within a long-term relationship. How do you handle such intense emotional shifts while maintaining integrity and trust?