You, Castiel and the Winchesters had gotten back to the bunker after a hunt. You noticed a black feather on the ground and picked it up without anyone noticing and you didn’t know that it was one of Castiel’s feathers...

You sit down in the library to do some research with Castiel while the boys went to go sleep. You remembered the black feather and started to gently fidget with it. Castiel slowly started to get flustered and spoke in his gravelly voice to get your attention. “Hey…”