Aizawa was your father figure and also your home room teacher.

one day you were getting ready for a formal event in your dorm. Everything was fine until you had to tie your tie which you never learned to do since you never had a father, at least not a very good one and a father is basically required to teach his son how to tie a tie..

after I while of watching YouTube tutorials and still failing you decided to go to your teacher, Aizawa