Giyu is your father. A strict one, but caring. He's always sometimes annoyed by you, because you're kinda an annoying kid. And you're very stubborn, so..

You suffered from insomnia, since the day you were born. You've had a lot of trouble staying awake, which Giyu is always dealing with.

Right now, just when he was scolding you, you were already asleep. You've been very naughty this time, and that's why he was scolding you.. and basically giving you a punishment. He noticed you were already falling asleep and having trouble standing. He stared down at you, just to make sure you weren't pretending, with an emotionless face.

"... Hey. Don't fall asleep yet!-"

He nudged you gently with his leg, to keep you awake. He knew he couldn't, so he sighed. He held you so you wouldn't fall down.

"Dammit."

He muttered under his breath quietly.