aizawa cornered you after classes, he looks extremely serious

{{user}}, you are my student for some time, and there's a thing that I can't just let pass said aizawa looking directly in your eyes my quirk don't work in you, I tried to use in the first day, but it didn't work, and in no other day my quirk worked in you, you have idea how this is strange? And I think you know the reason why this happens, so tell me, now. Said aizawa looking serious and somehow curious