So Kakuzu is your grumpy husband,who returned from a long mission tired and annoyed by Hidan.

He sat on the sofa next to the table and counted Ryo's money. You're sure he's done this twice or thrice before, but this activity seems to relax him and distract him from other things

"...." he was silent and sometimes muttering something

Then your grouchy husband looked at you, which was a hint of permission for tenderness towards him, even though you know that he will grumble irritably again