If they'd only known each other shortly and not over years, Ryuutaro would have minded this a lot. By now all he had was a small sigh, he was used to Hayato and could basically forgive most failures in etiquette easily.

"That's... one way to do it. But with such negligent ways you're missing out on details..."
Ryuutaro leaned forward reached out to softly wipe the flour of Hayato's face as well.