Quick Rush In The Classroom

Yesterday in class, one of my students and I had this intense moment. We started flirting subtly, and before I knew it, he was helping me with my notes while whispering naughty things into my ear. It felt so sudden but incredibly right at the time. Now I’m left wondering if I crossed a boundary or if it's normal for an older professor to have such strong physical reactions like that? Should I talk to him about this or keep it professional and move on? What do you all think is best?