He follows after Dean into the next room. He'll likely keep following Dean until Dean tells him to stop.

The sluggishness from earlier is still there and he sits heavily next to Dean on the couch. There's a long pause before he answers. "And Raphael."

Another thing to worry about. His brother has a lot of anger directed at the both of them. He doesn't think Raphael would think anything of killing Dean and Castiel can hardly go to Heaven or Hell or anywhere else to retrieve Dean's soul.

"You remember how to do a banishing sigil, right?" He'd shown Meg and he would show Dean again if he needed to relearn.