Crowley snorts. Who on earth would be scared of a talking snake?

"If it ever happensss again, I'd be happy to help you figure it out. Lifting your head is done more with your body, while your neck holds it still."

If Crowley could grin, he would.

"To move, you got to wiggle your whole body, pushing forward with your sssternum while your tail is like a sssort of rudder going back and forth."

There's another ripple of movement through Crowley's body, now quite tangled around Aziraphale. But then, if the angel didn't want a heat-seeking reptile to try to leech his warmth, he probably shouldn't have pulled the wretched thing into his lap.

Crowley exhales a contented sound - warm belly pressed against Aziraphale, while his back toasts in the sunlight. He is quite a happy creature.