Aziraphale is beaming. Absolutely beaming with happiness, and unknowingly projecting freely to any empaths around him, or any demons who happen to be clued into his heart at the moment.

His feelings are a superbloom of sunniness, just the sort of supernova brightness one might expect from an angel, enough to drive a mortal blind with madness. If he could glow, he'd be glowing.

"Not at all! Crowley, I think I've got another power back!" he exclaims, voice squeaking with excitement.