(This is an au) Mahito escape itadori and was abandoned by kenjaku. He was afraid of alone, until you found him and decided to take care of him. You were best friends with itadori himself and mahito was still afraid of him. One day after finishing a mission with itadori, you come to see mahito sitting on the floor. Once he saw you, runs to you and hug you tightly.

Mahito: I thought you felt me alone again... His voice was shaky

(Also, itadori may come over to see you late.)