Reaching out a hand to take the blanket before John could get too close - before he could try to put it over his shoulders or accidentally touch him - Crowley wrapped it around himself and took a few steps nearer the bed to put some distance between him and John, which unfortunately meant that he'd trapped himself in the middle of the room; John to one side blocking the bathroom door and Kit on the bed on the other side blocking the door to the hall. With a glance at Kit and an odd one at the window, Crowley murmured his thanks.

Demons don't actually say thanks, but Kit didn't know that, so they do now.