He could see the move coming but he didn't react in time; hissing through his teeth as vice like fingers gripped his jaw he stared into Cas' eyes, only see his older brother's essence burning in them. "Crowley knows nothing about me or what I'm doing."
Reaching up, Gabriel slapped Lucifer's hand away, bristling with annoyance and sending a fresh wave of static through the air. "If you left a mark, I'm going to kill you."
The threat was an empty one, and they both knew it. Even though Gabriel was beginning to see that the brother he knew was all but gone, he still couldn't bring himself to harm the elder Archangel. Broken heart or not, he still loved the annoying bastard.