Aziraphale spends a very long time denying and fretting over things he wants, because he’s not supposed to want or need human things as an angel and this is why it’s been 6000 years of slow burn. But once he has those things he loves? He’s a glutton. He happily consumes endlessly to try a variety of delicacies and indulges in his favorites, collects rarities with dedication, and basks in enjoyment of what he loves.
So I like the idea, that in another 6000 years or so, when he and Crowley make more snail progress in their devotion to each other, that Crowley would turn into the one so overwhelmed and feeling too much because his angel held his palm and kissed it and Aziraphale is the one slowly and methodically and patiently diving head first into things he finally allows himself to have, to admit at last he wants this. It probably wouldn’t be fast, all at once the first time, or even very skilled. But he’ll get better. And then he would do it all over again, and again because he could, and he would never stop wanting. He would consume and worship Crowley with the same vigor he applies to his love of food and his adoration of books and the arts. He is a dam waiting to break, holding on to the last, but once he breaks? He floods his love everywhere it can reach.