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"Dean" said Cas, tentatively, as the Hunter refused to look at him, and Cas wasn’t surprised, their fight had been explosive, and had resulted in Dean fuming and Cas going out half an hour ago, slamming the door behind him, which was why Cas’ next words were said in a soft, nervous tone “Dean, I brought pie"
Dean was royally pissed off, to begin with anyway, and the fight had been about something incredibly stupid (so stupid that Dean couldn’t actually remember what they were fighting about), it was just that they had been cooped up in the motel for a while (Sam had done the smart thing and left earlier) and tensions were high, but as time wore on, Dean became less and less angry and more and more guilty, terrified that he had seriously screwed things up with Cas.
So when he heard the nervous “Dean, I brought pie" he perked up, walked over to his angel and gave him a giant hug, whispered “I’m Sorry" in his ear, and then clapped his hands together and said, "now how about that pie?"