Crowley lets out a bark of a laugh at that. A tame snake, indeed. He hasn't been much of a snake since that day in Eden, when he first met Aziraphale. The angel had intrigued him, then, and now----well, now he was completely at his mercy. Normally, in temptations, it is the demon who leads the way. Who does the initial touches, who pulls the other towards sin and lust. And here they are, Aziraphale pulling Crowley along into bliss.

He reaches between them, taking Aziraphale's shaft with his own hand, curling his fingers and stroking, keeping in time with the angel's touch to him.

"My heart is ever at your service," he says, before kissing him again.