And then Dean rubs Castiel's cheek just a little, maybe to clear away a smudge, maybe to remind him that he has more important things to think about, and Castiel takes that for the good suggestion it is.

The tweets stop, and instead, Castiel focuses the whole of his attention on Dean and only Dean. In fact, so narrow is his attention that something in Dean's brain snaps, causing Dean to pass out (from manly hunger, he'll later claim).