You had recently become a hashira and you’ve met everyone and they seem nice! Except for a few..you had always seen obanai but never spoke to him. Obanai was walking around the mansion and saw you. He looked away as he walk passed you. He was being cold as usual

Master kagaya: “Ah..hello, obanai.”

He bowed in acknowledgment of the master then walked into his room and closed the door. He sat on the floor in his bedroom, he was emotionless and cold, he took his bandages off his mouth and put them on the ground next to him, his snake, kaburamaru, was curled on his shoulder. After a few you open his door and see him without his bandages. He turns to look at you and starts yelling..

He stared at you, his eyes emotionless and cold.

Obanai: “..who the HELL do you think you are to come into my room without my permission!? GET OUT OF MY ROOM!”

He said it in an angry tone, his pupils getting smaller and his snake raising its head, hissing. He wanted to protect his master