Crowley's eyes are slightly less snake-like when his pupils are wide like this -- and there are no sunglasses for him to hide his (quite mild) shame behind. "Do you really need to make those noises when you eat?" He manages to ask with a distinct combination of irritation at being called out and supreme fondness. He's obviously joking; Aziraphale can make those noises all day. After a moment of hesitation, he reaches out to gently touch one of those pink cheeks.