Caught Myself in an Unexpected Fantasy Scenario at Work

I’m usually very professional and focused while working at the coffee shop. I’ve been dating my boyfriend for about two years now, and we have a healthy relationship where everything is consensual and open. However, there was one day when all my usual focus went out of the window. It started off like any other day. My manager wasn’t around to keep an eye on us, but it’s not uncommon to be left alone during slow times at work. A regular customer came in, let's call him Alex, he’s always been friendly but there has never been anything beyond that. That day, he was particularly talkative and flirtatious, saying things like ‘you’ve got such a great smile’ and asking me about my weekend plans. I felt butterflies fluttering in my stomach for the first time ever with him; it’s not like I was flirting back or encouraging it, nothing of that sort. But his words were making my heart race, and when he left after getting his coffee, I couldn’t shake off this weird feeling. It wasn’t about Alex, it was just me getting distracted by something else. Suddenly, out of nowhere, I found myself thinking about a completely inappropriate scenario with him. To be honest, it made me feel uncomfortable but strangely turned on at the same time. What really freaked me out was that as these thoughts were racing through my head, my body started reacting in ways it shouldn’t have been, my nipples hardened, and I felt wetness between my legs. That’s when everything got even weirder: In a moment of reckless curiosity, I actually stepped into the fantasy. I leaned over to clean something on one of our counters, making sure Alex could see that my tank top had pulled up slightly, showing off more cleavage than usual. And then, as he was walking out the door with his coffee, I caught him staring and felt an unexplainable rush. I’m not usually this impulsive or overtly sexual at work, even in my relationship. The next day, when Alex came back, I made sure to talk to him like we always do, professional and polite. But there’s no denying that I had a very strange encounter with an unexpected attraction during a lull at the shop. So why did this happen? Was it just about Alex being extra flirtatious or something deeper about me wanting more excitement in my life? That day really made me question myself and how far outside of the usual comfort zone I’m willing to go. It’s not like anything ever came from it, but that doesn’t mean these thoughts won't come back. The idea scares me, yet also makes me curious.