A sharp intake of breath and Crowley is too distracted by that bite to even choke out a comment about what a naughty thing Castiel is, but he thinks it. He tightens his fist in Castiel's hair, tugging at the roots. Even if Castiel doesn't enjoy pain the way he does, who doesn't like a little hair pulling and scratching? He imagines Castiel will figure out what he likes as they go and won't that be fun?

He breaths out, shaky and uncharacteristically desperate as his hips thrust into Castiel's hand. He can feel that he's on the cusp. He just needs a little bit more.

He thrusts his hips once, twice and then he comes with a low groan.