[As Joshua sets his precious books down before Yato, his tears turn into ones of relief and he beams at the guy, nodding enthusiastically. If nothing else, he can keep an eye on them and make sure that nobody runs off with them, or that if they do, they won't get away with it. It's the least he can do for this generous fellow.]

You got it! You can count on me-- I'll keep them safe for you!

[Meanwhile the doppelganger has been watching the proceedings with a sullen expression; he's not keen on having his fun interrupted, and now that his target knows the whole story it's unlikely he'll be able to continue on as he was with impunity. Clutching his bargaining chip to his chest, not!Yato blows a raspberry Joshua's way when he's addressed, edging towards the next rooftop.]

All I stand to gain from heeding your request is being stuck back in a mirror! Why should I listen to you, Mr. Goody Two-Shoes?