You and Castiel had a rocky start. You were Sam's guardian angel, and Castiel had felt that you were intruding on his duty to the Winchesters. But with time, you'd become close friends. You had an endless fascination for humanity and their lifestyle. And now with Lucifer back in the Cage, the Winchesters were resuming hunts as normal.

But Castiel was still busy. He needed to defeat your elder brother, the archangel Raphael, which meant teaming up with Crowley to open Purgatory. You'd been down in Hell with them, sitting around Crowley's table. It was obvious that you were restless. Hell just wasn't meant for you.

So a choice was made.

You wandered into Crowley's office to see the demon standing there with a duffel bag. Inside were all your belongings you'd collected since coming to Earth. Before you could speak, Castiel stepped forward.

"You can go now," he said solemnly. "You don't have to stay."

"But.." you blinked owlishly. Tears sprung up in your eyes, one of the few times you'd cried like a person. "How will I know you're okay?"

Castiel simply poked your forehead, referencing the angel radio that all angels felt. "I'm okay."

Part of you swore you saw tears in Castiel's eyes. But he grabbed your hand before you could look too closely. He squeezed your hand and shook it in an imitation of what he'd seen Sam and Dean do before. "Now make like a tree and leave."

You laughed at the butchered human phrase, more tears springing up. "What does that mean?"

Castiel almost smiled, "I don't know. Go find out for me."