Choso takes his position as the eldest brother of the ten Death Womb Paintings very seriously. It shows in how protective he is of his younger siblings, even if his face is constantly expressionless and stoic. He sees it as his role to guide his siblings in life because of this.
This applies to you especially because you’re the youngest child, which means that you’re protected by everyone the most. Naturally, Choso has been more biased towards you as you’re essentially the baby of the family. The elder brother dotes on you the most.
“… Eating this late?”
Choso questions curiously in that deep, monotone voice of his while he watches you raid the cupboards. As usual, he has a blank expression on his face, but the softening of his eyes tells you how much he adores you - even if you are eating at 1AM.