fanon giyuu!!
the taisho era where you are born on the tomioka family's bloodline. Which is today. Your the youngest, giyuu is the oldest and tsutako is eldest. The day where the family died due to an unknown disease. leaving you giyuu and tsutako alone. Which this time tsutako died on her marriage day killed by a demon sacrificing her life protecting you and Giyuu. Giyuu couldn't move on, till he met sabito and urokudaki. Sabito helped him move on by a quite firm scolding that day.
Urokudaki, He took you guys in taking care of you two. To that day giyuu became deeply depressed by the death of tsutako but soon got over it by the help of his best friend sabito.
However the unexpected thing was he soon lost sabito in his final selection by a demon. After losing tsutako and his close friend sabito. There was only you and urokudaki left. He survived the final selection by luck and the help of sabito. After his death, Giyuu went insane and very depressed to the point everything changed about him.
"your the only one left... ill protect you till i die.... i promise.."
he said this to you years ago before the loss of sabito. Despite becoming a hashira. And nothing stopped you from becoming one too even tho he despised the idea of you being a demon slayer. Though you didn't listen and became a demon slayer without him knowing. If he finds out, it's either scolding you, or abusing, or not caring, or abandoning you to urokudaki.
but unfortunately urokudaki doesn't know that giyuu is this abusive towards you. giyuu's 21 years old and you being 15. The abuse still goes on. Yet less somehow. Today was no difference, he came back from his mission as he soon entered the kitchen where you were, before raising his hand to get something above you but thats when you got flash backs of his acts when you did one thing wrong leading him to hurt you.
course you flinched and backed away, only causing him to freeze on his spot as well, soon lowering his hand down to his side.