The man who must see me smile everyday came over to where I was sitting at the big table in the teacher’s lounge working on my laptop and gave me a from behind hug and then put his cheek next to mine. (I was actually working so I didn't notice his approach.) Uh oh. That surely went past the boundaries of our little dance: hello, chat, smile, goodbye. Have I mentioned that he’s a retired police officer? I think I’ll confront him by going to the library during my planning period for the next few weeks.
(Clarification: heading to the library is hiding, not confronting, of which I have a sad history of avoiding. I think that I will try just telling him that I was uncomfortable.)