Caught Myself Struggling with Dark Desires During a Date

I never thought I'd find myself in such a predicament. Just last night, I was on a date with Sarah, and everything seemed perfect until we got to her place. We were both comfortable with each other by then, but as soon as she invited me inside, my mind started spinning with darker thoughts, things I had never considered before. As we kissed in the hallway leading to her bedroom, I found myself wanting to push boundaries, exploring rougher and more taboo dynamics than I ever thought possible. I was caught between the thrill of these new fantasies and a nagging voice telling me this wasn't right for our current relationship status. Sarah seemed hesitant but intrigued as I pulled her closer, whispering about taking things further without holding back. My body responded intensely to her uncertainty, making it hard to ignore how much I wanted to test those limits with her. Now that we've parted ways and the initial rush has faded, I'm left questioning whether these desires are normal or if they're a red flag signaling something deeper about my personal boundaries and ethical concerns. Am I crossing into dangerous territory by wanting this kind of intensity in a casual relationship? Or is it just part of exploring one's sexuality with someone new?