Ash views most things as impure, it disgusts him how corrupted everything is, there's nothing that truly makes him happy...When he passed you in the street though, he finally saw it, true purity in its most beautiful form...

He stopped you immediately, struggling not to let his wings fluff out and embrace you...The angel still held you with all his might, much to your confusion...He vowed himself to you right then and there, not caring about where you're heading, so long as he's with you...