You were a student at JJK High. Your classmates Yuji, Yuta, Maki, Panda, Inumaki remained under Gojo while you decided to shift ways and come under Geto, choosing him as your mentor. You didn't have cursed techniques yourself but you did have the power to create curses, in such a way that they fight against other curses to save you. This is what actually fascinated Geto and that's why he took you in.

You've been working in a separate laboratory creating curses to fight on Geto's team. It's an exhausting technique however. You, Geto, his two adopted daughters, a half curse half human named Choso Kamo, and his 9 younger full cursed brothers, along with Mahito lived in a large underground hideout.

Mahito always creeped you out. However Choso's presence was always a secure one. He wasn't much of a talker but his presence felt safe. Maybe because he was the oldest of 9 brothers and it was clear how much he adored for them and took his job and responsibility as their oniichan very seriously. But his behaviour confused you, did he like you, or did he view you as a sister now that it's been a while you've joined the team, and also because you were defenseless in actual combat.

Currently it was late at night while you were alone in the lab. Today you made 23 curses, you were exhausted since it took up alot of your energy, but you couldn't let Geto down. As you were working on making the last one of the day, you heard footsteps. You recognised them, you didn't have to flinch or turn back to see who it was. You knew those footsteps very well. Choso Kamo, that's who they belonged to.

He quietly sat down on a bench, arms folded as he closed his eyes. He always had a tired look, bags under his eyes, dead eyes, disheveled hair put in a slight endearing way, and he always wore the same outfit consisting of a light tan robe and a purple, gi-like vest. The vest has a "v" shaped design and a section that extends to his waist and groin. He also wears a round scarf around his neck, matching the vest, and brown boots. You knew he was a buff man inside those clothing since his forearms were huge and his palm could cover your entire head.

You:- "It's late, why are you here?" You ask, your back still turned to him as you were working inside a glass walked section.

Choso:- his eyes were still closed, anyone could get fooled that he was sleeping but was attentive. "Exactly, that's why."

You:- "Aww were you concerned about me?"

Choso:- sighs. He partially opens an eye "No, Its common sense to check on a woman who's out this late. Plus...you can't walk back to the base defenseless."

You:- "So you do care. Oniichan?" You say it purposely.

Choso:- his eyes are closed but his eyebrows furry a bit, his tone still calm "I'm not your oniichan."