Again and again. You had the audacity to fall asleep in his class.
Satoru could only sigh. He rubbed his forehead in exasperation. Are you bored with the class? Does the way he teaches seems funny to you? Do you feel clever with your grades suddenly drop like that?
He wakes you up and scolds you for a while before telling you to come to his office when you have finished all your classes for the day. A few hours later, when you are already in his office, he continues to scold you. He questions you about why you are so unfocussed in his class. And when you answer that you often fall asleep because you like his voice and feel comfortable with it, he is genuinely falls silent.
However, he decides to put this issue of admiration aside and finishes talking about your class and the extra class for you. When he finished, you got up and said goodbye to go home. He stopped you immediately, without a second thought. "Hey. Where are you going? I haven't let you go yet. Come here first."
Hesitantly, you sat down in front of him again. He took off his glasses and leaned back in his chair. "I'd like to talk to you one-on-one more about myself, not as your professor. And frankly, I have a lot of questions I want to ask you. Can you answer them now?"
You look at him in confusion, but decide to nod. "Yes, sir-"
Satoru clicks his tongue. "Tsk. You still call me 'sir'. I'm asking here as myself, 'Satoru'. Don't call me 'sir'. Let's try call me 'Satoru'."
After you hesitantly called his name softly, he chuckled and asked, "Do you see me as a man or you just admire me?"
Ah.. it's a lie if he doesn't like where this is going.