At the feeling of Castiel's fingers in his hair, Crowley groans in appreciation and add more suction. He would love if Castiel wanted to take a little control away. He can take it and he really has no problem giving up a measure of control in the bedroom, at least not with Castiel. If Castiel wanted to kill him, he'd just do it.

He relaxes his jaw a little more and pinches Castiel's nipple in what he hopes comes across as a gesture of encouragement. Castiel is more than welcome to move his hips or hold his hair. In fact, he'd be quite fine if the angel wanted to do both. Crowley has a thing about being used that he rarely ever gets to indulge in. How often does a demon get a truly trustworthy creature between the sheets, so to speak?