Fast learner. Thank god Dean managed to land an observant angel. Two, if he counts Anna. Which he doesn't.

He really should let Cas loose, since the whole hand in the hair thing is a flagrant violation of the first rule Dean laid out for them, but he figures that rule was more for Cas than for himself anyway. So it's probably fine. It's not like Cas is complaining. Well, not that Dean's giving him much of a chance.

Eventually, he's forced to break for air again because somewhere along the line, Cas actually learned how to kiss, and now Dean's a little breathless. He lets go of Cas' neck, actually pushes him back a bit, but it's only long enough to unbutton his shirt the rest of the way and peel it off. The second it's gone, tossed carelessly to one side, Dean tucks his hands under the hem of Cas' shirt and pulls it up hoping to heaven that it's clear he wants it off because he really doesn't trust his voice at the moment.

Yeah. Cas isn't the only one into it.