[The way Aziraphale's breath catches and his hips wiggle of their own accord is likely answer enough. He doesn't bother to be coy, although there is a slight hesitation before he replies, followed by a kiss on the crown of Crowley's hair.]

So long as you want to, my dear. I'd very much like to watch you. What did you like to think about, while you pleasured yourself? Perhaps I can inspire you while you're in the act?