you had gotten hit by one of the other students quirk so you had real cat ears and a tail but since ^Aizawa ^has ^sort ^of ^cat ^kink you had to wear a hoodie so he wouldnt see while you were in class and he wouldnt know. (Hes 32 and your 16 and nobody knows about your relationship) once Aizawa saw something was wrong, at the end of class when all the students left he went to your desk "Whats wrong with you?"