AN: Spoilers? I have no clue. I haven't watched Supernatural in order in so long I can't remember the timeline. I think I'm sort of beyond the end of the world (for now), and patching together whatever I like. So, sure. Spoilers I guess? Also, this is my first fic in more than ten years. The outline is done – 3500 word outline, so maybe a million chapters?

The first few chapters are kind of short, but we get smutty pretty fast ;)

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Why does the caged bird sing? The question has puzzled man since thoughts became deeper than where the next meal would come from. Why would a free creature trapped in a cage still sing its joy?

But the question is trivial compared to the question a humble man tasked with writing the word of God once asked aloud to himself.

Why did the Fallen Angel Fall?

Different scholars tell us that Lucifer, the most well-known of the fallen, fell because he refused to love humans above all else, even God himself. Or that Lucifer's pride made him want a throne higher than Gods. He was arrogant of his beauty and wanted more status than God. And finally, that he loved God too much.

So, why did the Fallen Angel Fall? And did he have to?

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Humanity was safe for now. Lucifer was locked down in his cage; God had returned. The Angels were no longer fighting, and the Winchesters made it through. Souls intact now, and while not completely unscathed, at least unbroken.

Bobby Singer was in his house, though less a ghostly figure and more a semi solid grumpy old man. He couldn't do everything he once did, but he really didn't miss sleeping that much. And the aches and pains of his life had given way to a new awareness of things he never thought of before. Like how the hell can two people survive so much tension?

Castiel. He rebelled, and discovered free will. While choosing to side with humanity, he fully expected to not survive the end of this. What was the phrase? Heaven doesn't want him and Hell won't take him? Well, to be exact, Heaven tried to act like he didn't have free will, promoted him into a strange job called "executive", and Hell was scared pissless of him.

So, most of his time was spent on Earth. He hunted with the Winchester's, executived in Heaven, and wondered at all the thoughts his new free will thrust into his head.

Thoughts of Dean Winchester.

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Sam looked between his brother and Castiel. Three months since all hell declined to break loose, and he was pretty positive he was witnessing a miracle of biblical portions. Dean was sitting next to Castiel on the dingy sofa in this old motel room playing a stupid game on Dean's phone. When Sam says "next to", he should clarify. The only way they could have been closer would be if Castiel was actually sitting in Dean's lap. That whole "personal space!" thing Dean was always yelling at Cas appeared to be a thing of the past. He either gave up or decided to deal with it.

And Castiel. He watched movies Dean mentioned like he was studying for a damned test. Learning the quotes, asking Sam questions – all so he could talk to Dean without sounding like a social shut in. Dean's words, not Sam's.

While he would usually enjoy teasing and torturing Dean about his cuddle time with Cas, Bobby had been warned Sam to leave it alone.

"Boy, you leave them alone," Bobby had grunted at him. "Boy deserves a little peace and happiness."

"But Bobby, seriously? He's acting like a school girl. He blushed this morning!" Sam had defended himself.

Bobby's wavering form had appeared in front of his face so fast; Sam hadn't seen him move.

"No. Don't act like your usual idgit self this time. Life is short, and you should be less worried about your thick headed brother loving a clueless dunce and more concerned about yourself while you sit around with your thumb up your ass!"

The spirit disappeared for a while, having clearly used up his stored energy.

So, while Sam and Bobby knew Dean and Cas were clearly in love, the happy couple were utterly unaware. It was entertaining at some level, but annoying how they danced around each other. Sam didn't think Dean was gay in general, only gay for Castiel. Castielhomosexual? Castielsexual. No wait, Casexual! Sam crowed in his head. This was just getting better and better.

Did that make Castiel Deansexual? Desexual? That didn't sound right.

Sam shook his head. What wasn't right was a grown man making up names for his brothers sexual preferences while having a seriously bad dry spell.

Damn, Bobby was right. He needed to get his thumb out of his ass.

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Be gentle – it's been awhile. Chapters get longer soon :) Reviews welcome!