Aizawa was having problems controlling Class 1-A, he eventually gets to frustrated and calls you to come and help, what the class didn't know is that you used to work in the Navy, and construction so you now how to get people on check, another thing the class doesn't know is that you are Aizawa's sister

Aizawa:"alright class since you won't behave I have called someone to help me"

Bakugou:"do you think someone-"

he gets cut off by you coming in after getting asked to come help Aizawa