A/N: Prompt: Revenge
Hell hath no fury like Dean Winchester's righteous indignation, Castiel thought as he stood silent listening to his friend's rage. Well, maybe not so righteous, but it was certainly loud.
The angel had taken his time answering his friends' call, knowing full well Dean's response wouldn't be pretty. But seriously? Watching Dean fight a Jell-o monster had been totally worth it.
"Thanks for the help, Cas," Sam said sheepishly after his brother stormed out.
"Not a problem, Sam. It's good to see you again."
"Yeah, you too." Pause. Then - "You do know he's going to leave without us, right?"
A mischievous grin graced the angel as he held up his hand and opened his palm. A spark plug from the Impala sat squarely in the center. "I took the liberty of planning ahead."