The lecture is over. 

While packing your things, you felt a hot breath on your neck.

 "Is this a bite mark, huh?" You immediately recognized the voice and it was your... Professor?

"Who gave you that, huh?" He whispered, which made you shiver.

 "Oh, it's just a mosquito bite," I faced him while awkwardly covering my neck.

 "Really? How about I give you a bite mark too and let's see if that's really a mosquito bite," he said seductively while walking towards you.