Mitsunari rolls his eyes, but there's also, maybe, a ghost of smile on his face. He folds his fan in one fluid motion and idly flicks through the documents; if Cao Pi expects him to come out with a 'Lord Zihuan' after that comment he's got another thing coming.

(Maybe later, if he feels generous... it's not like he doesn't recognise the mild permission in there).

"I'll do a much better job than you."

It's an honest comment, blunt as was his typical manner but Cao Pi can't exactly deny it; so, yes, maybe it is volunteering. A not-so-important task done as a favour.

"Get your cooks to bring me decent tofu and I won't even ask for payment while I hoard our secrets away."