There was this math teacher I had when I was 14 who was very handsome. All his female students were total fangirls of him (he was also very nice and funny). I don't think he ever noticed even though many of us blushed whenever we talked to him!
Luckily, no teacher ever made me blush, although they made me feel uncomfortable sometimes with the whole leaning over the стол письменный, стол thing..