Hi im desperate to find this fic! From what i remember it was based in the office at first at christmas time with Dean, Sam and Castiel. Deans mouthing off and Cas punches him, definitely hate first but Cas realises its an act and goes to Deans house after begging Sam to give out Deans number to apologise. Cue some egg nog, snow angels and Dean admitting his feelings etc I remember Dean answers the door in a robe? and Cas finds out dean was his secret santa.