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92. Salt
"I've always wondered something," Dean commented idly, picking at a fry on his plate. "How could Ruby eat these things? Wouldn't the salt burn her face off?"
"The salt in food is impure, which reduces its potency," Cas said immediately. "Also, the salt must form an unbroken line to repel a demon, hence why demons can cross a line of salt if it is broken. All Ruby would have felt was a mild to moderately painful tingling, as though she was eating chilli, and all demons are masochistic to a degree."
He stole a fry off a stunned Dean's plate.
"That…makes sense," Sam said slowly. Cas smiled, nibbling on the fried potato.
"Course it does." Dean slung an arm around Cas. "Cas knows his stuff. Watch out, Sammy, you're gonna be out-nerded one day. We won't have any reason to keep you around anymore."
The bitchface Sam levelled him with was totally worth it, as was the thankful kiss that Cas pressed to his cheek.