Verity shakes her head, and starts walking back around to her original position, eyes never leaving Sam's.

"I'm sorry, Sam. Dean is old enough to drive, vote, drink, have a bar mitzvah, father a child . . . any definition you pick, your brother's an adult. He made that deal of his own free will, fair and square, no tricks, no loopholes.

"It's ironclad.

"It can't be broken."