Castiel would never forgive himself for what he'd done. How could he have hurt Sam like that? How could he have betrayed some of his only human friends?
When he came back, he at least remembered what he'd done. Seeing Sam in that state pained him, just knowing that all of it was the angel's fault. Sam was nothing but loyal and good, and he didn't deserve this.
"I never should have broken your wall," Castiel said.
He took on Sam's insanity. Sam begged to stay with Castiel, to check up on him, but Dean insisted that the angel was only a danger to himself and the Winchesters, and Meg would take care of him.
Sam didn't forget. He stayed up late at night, worrying about the angel, if he was okay, or even alive.
"He's fine, Sammy," Dean said, "Now go to sleep."
"Do you really know that or are you just making shit up?"
"Go to sleep, Sam."
Castiel woke up, but he wasn't Castiel. He was...broken, childish and innocent.
"Sam," Castiel spoke cheerfully, "I have brought you a sandwhich."
The younger brother gave him a strange look, then smiled.
"Thanks Cas," He said.
The "broken" Castiel appreciated how much more patient and kind Sam was to him, rather than Dean.
"What are you working on, Sam?" Castiel noticed the laptop.
"Oh, hunter stuff," Sam answered casually.
"Fascinating," Castiel moved closer to Sam.
The angel put his arm around the hunter.
"What are you doing?" Sam asked.
"I like you, Sam," Castiel answered, "You're friendly."
"Uh...thanks," He laughed.
The broken angel lied in bed with Sam at night and whispered about bees and Italy and flying and whatever else he did that day. The hunter listened to every word.
Dean and Castiel killed Dick Roman, which sent the two to Purgatory. Sam quit, gave up hunting and tried to settle down with a girl named Amelia.
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Sastiel Through the Seasons
FanfictionCastiel had been observing Sam for years, even before the angels came to Earth. Seeing the boy was one thing, meeting him was another.