"So I can't tell anyone this," Dean says, picking at some grass as he speaks, "but I get scared sometimes. Lots of times."

Castiel nods, staring at him, understanding. "A lot is expected of you."

Dean looks up and blinks. "Yeah, I guess so. But I'd do it again. Sammy needs me."

"Your brother," Castiel notes with a small nod.

Dean nods back, then returns to his grass-picking. The wind picks up and lifts his jacket. He shivers.

"Want mine?" Castiel asks, pulling off his own jacket and handing it to Dean.

Dean smiles. "Thanks," he says, putting it on. "Aren't you cold?"

Castiel shakes his head. "We don't get cold."

"Oh yeah. I forgot."

Dean continues to pick the grass. There's a bald spot on the ground now from where he's pulling the blades. Castiel watches intensely, then looks down at the grass below his palms and attempts to mimic Dean.

"Why are we removing the vegetation?"

Dean looks up as if Castiel is speaking a foreign language. "Vege…you mean the grass? I dunno." Dean shrugs. "It's relaxing."

Castiel frowns, but continues to pull the grass out along with Dean. They're both silent for a long time as the wind blows harder.

"People wouldn't believe me if I told them about you, would they?"

Castiel looks at Dean sadly. He doesn't have to respond for Dean to understand the answer.

Dean can hear Sam crying inside the house they're staying at. He's being beckoned back to his real life. Reluctantly, he looks back up at Castiel. Castiel knows it's time.

Dean stands, and so does Castiel. They both hesitate. Dean doesn't want to go back inside, back to the loneliness and the stress of taking care of his baby brother. After a long moment, Dean speaks up.

"Will you be back?" Dean asks.

Castiel stares at Dean, a smile slowly spreading across his face. Even as an alien to humanity, he understands something that Dean has yet to comprehend. With a deep breath, he answers softly, still smiling.

"I'll never leave."