Oh, that's too much. Crowley finds a spot within Aziraphale that makes him practically sing, notes of pleasure punctured by gasps when Crowley takes him into his hands and he won't last much longer after this.

He wants to warn Crowley but he doesn't get too much of it himself, pleasure striking him suddenly and spilling over, Crowley's name half-caught in his throat, hands digging into his arse and trying to hold him as he comes. The light turns too bright and flickers, and he accidentally spreads that satisfying angelic warmth to everyone in the entire building.

Aziraphale blinks his eyes back open and tries so very hard to catch his breath and paradoxically pull Crowley into a kiss at the same time.