I am a (new-ish) professor and I also consult on the side. In one of my consulting trips, I was staying at a nice hotel with a decent bar. First night there, I went up to the bar, sitting alone, having some bar food for a quick dinner.
I was surprised to see an ex-student of mine walk in calling out for me and waving at me from far off with a big smile. She told me she was on a girls’ trip, and sat down beside me. We caught up on what she had been upto after graduating, and I told her about my work over drinks. It didn’t take long for our talk to go from academic stuff to outright flirting. She was wearing a dress and I’m pretty sure she noticed where my eyes wandered to occasionally during the conversation. I invited her to my room to “continue catching up”, but we both knew what we were going to do.