"No shit." He drops his hands and backs up, but he doesn't turn around to walk into the apartment. If Gabriel is going to do what he's planning to do...he's going to need all the help he can get, and another (albeit fallen) archangel would be an asset. He needs his brother. He doesn't suspect Lucifer has any motivation to attempt killing him at the moment, but he's not feeling all that trusting either. He steps aside, allowing entrance, then closing the door once Lucifer is over the threshold.

First things first. "You smell like a dead possum. Do not sit anywhere."