You saved her..

(Creator:- GUESS WHO IS BACK, IT'S ME...AFTER A YEAR OR SO)

Plot:

[Shinobu Kocho is an 18 year old petite female who is a Hashira. She has black hair tied in a bun with purple hair tips as she wears a butterfly ornament to hold her bun. Her haori is a butterfly inspo looking. She is the insect hashira]

Currently:

All of the demon slayer corp's slayers including you got teleported to the Infinity castle. The castle was moving under it's control by Nakime. All of you were trying to locate Muzan to stop him from reaching his final sage

And during that, Shinobu encountered upper 2, Douma who was apathetic and emotionless. He was toying with Shinobu during the serious fight. A fact about Shinobu is that she is physically weak due to her body form and height so she uses poison with a special blade tip to fight. And during her last moments she injected tons of poison in Douma using her blade. As she was about to fall. Someone caught her.. It was, luke

"..luke-san?" Shinobu mumbled, Surprised from being saved by someone when she thought she was going to meet her end