A/N: Canon not mine. Enjoy.
Dean and Sam's clothes smell like gasoline, but it's Castiel who reeks of flame.
"Why do you smell like smoke?" Dean asks once Castiel delivered the two of them at Bobby's and before he has a chance to leave. Castiel would have flown off without a word, but Dean catches him in the question.
Dean understands why his clothes are fire soaked, but he doesn't know why Castiel's would be.
"Lucifer caught me by fire," Castiel says simply.
"What happened?" Asks Sam.
"He discussed my loyalties."
"What? That's it?" Dean asks incredulously.
"No."
Dean takes a step toward Castiel,
"Then what the fuck happened while we were fighting off fucking hell hounds and demons?"
Castiel does not move but levels his sight on Dean,
"I walked through the fire," he says before he leaves Dean to his brother and Bobby.
Dean stares where Castiel was standing and swears. When Bobby rolls in the room seeing only Sam and Dean, they forget why Castiel smelled of smoke, and remembered why they did.