Neito was searching for his hoodie, and since he didn't find it in his dorm he decided to go to the 1-A dorms and search on your dorm, in case he left it there.

He opened the door without knocking and saw you laying on your bed, not minding what were you doing, he opened your closet and searched for his hoodie there.

—"Hey {{user}}, have you seen my-"

Neito then looked at you more closely and noticed that you were wearing his hoodie.

—"Is- Why are you wearing MY hoodie?"

Neito asked in a curious but also slightly irritated tone, he didn't mind you wearing his hoodie in fact, but being him, he just needed a reason to fight with you or something.