Dean startled awake as someone shook him. He immediately reached for the gun next to his bed, stopping only once he realized that it was Percy looking absolutely panic-stricken. Dean's heart sank.

"She's gone, isn't she?"

Sam was sitting up now, looking over blearily, "Who's gone? What's going on?"

"Ask him!"

Percy pointed to another dark figure behind him and Dean swore as he recognized the trench coat wearing Angel. Of course, Cas was involved. Dean shoved off his blankets and stormed over to Cas, glaring. Sam pushed off his blankets as well, his face still the definition of confused as he tried to not only wake up but put together the pieces.

"What did you do?"

"She asked me to. She said it was demigod business now and that you two had done enough."

"Demigod?" Sam frowned for a moment before Dean saw understanding dawning in his eyes. He looked towards Percy before turning to Dean, "You knew and you didn't say anything? The hell Dean?"

"I had to stay quiet! You like to think you're the rational one, but when it comes to things like them you suddenly forget everything monsters do!"

"Monsters? Dean, they're kids and if I had to take a wild guess, they're not that much different from the way I was!"

Percy was smart enough to stay quiet although he continued to scowl at Cas. Dean could tell the kid wanted to fight or shout at them to stop but was holding back presumably for Aella's sake. Even so, both Sam and Dean jumped and fell silent when there was a loud pop from the bathroom and the sound of rushing water. Percy started, his expression softening from anger to something akin to meek embarrassment. Water started to flood out onto the floor from the bathroom.

"Sorry…" Percy mumbled before he steeled himself, "Look, I get that you two are pissed at each other because of Aella and me, but right now I don't give a shit. Just convince your friend here to send me to her and you'll never have to deal with us again. It's a win for everyone."

"We're not just going to send you away," Dean said.

"You're not? But you just said we're monsters. Wouldn't it be easier to just—"

"It'd be easier just to kill you and then chase her down before she causes even more trouble," Dean cut in, "But fortunately for you two, I'm looking at the bigger picture. I can't just merc you two. It seems like if I did that, the monsters from your world would just keep coming in."

Dean cleared his throat, trying not to notice the hope in Percy's eyes or the half smirk that Sam had on. He knew damn well that Sam saw through his threat, but like hell if he was going to let either of them think he'd gone soft or worse, that he'd gone back on his code. There wasn't room for second-guessing as a hunter. He had to be firm in his conviction on what was human and what was monster. Aella and Percy blurred the line uncomfortably, but Sam had been right: it wasn't too different from Sam's situation and if he'd been able to make an allowance for his brother, he had to at least give these two kids a chance as well.

"Cas, can you send us to her?"

"No."

There was no consideration. Cas simply stated the word, his tone making it clear that he wasn't willing to negotiate.

"What? But if you don't she'll die!" Percy shouted (causing yet another small explosion of water from the bathroom).

"And if I prevent her from doing that our worlds will both end," Cas said.

"You don't know that," Dean argued, "Come on. Give us a chance to try to figure this out."

"There's no time to figure it out if she's headed to Camp now!"

"Perseus Jackson." Dean saw Percy tense up at the use of what he assumed was his full name. He stared at Cas, although he still seemed ready to try to fight, despite the look Cas was giving him. "You came to our world thinking there was some slim chance of saving her, but you already know this is false. She's already just a soul. Let her go."

The room was silent other than the trickling of water.

"What do you mean she's just a soul?" Sam ventured slowly, his voice quiet.

"Her soul is existing within a temporary shell in this world. The spell the witch used to bring her here dragged her from her body and left her in a mere shell, one that is slowly breaking down. The more she uses her abilities, the closer she is to death and even if she didn't use her abilities, it wouldn't matter. Her soul is powering the portals. Eventually, she'd burn up.

"So we have to save her then," Dean said, but Cas shook his head.

"We have to ensure that her soul returns to her own world. When the shell breaks, she'll have a moment to act. I think she is aware of what she has to do now."

"Assuming she's aware isn't good enough," Sam cut in, "We need to be there to make sure that nothing happens after she…"

"After she dies…" said Percy somberly.

Despite the revelations and Sam's insistence, Castiel still refused to send them to the Camp to search for Aella. Dean sent Percy and Sam out to pack up the car while he tried to talk some sense into Castiel. It hadn't taken them long to load up the car and once it was done, the two decided to wait in the Impala rather than to go back inside. Percy looked up towards Sam. He could hear Dean yelling at Cas still somewhere outside of the car. Sam seemed tenser than Percy had ever seen him, which made him more than a little uneasy. He forced himself not to fidget or make too much noise. Years with his stepfather had taught him that there were times where it was better to stay quiet and just wait for the high emotions to simmer down; so rational thought could come back.

"I always sort of guessed that there was something up," Sam commented quietly, breaking the silence. "There were all these little things that didn't make sense: one minute she doesn't know about hunters, the next she claims she's the daughter of one. She had a bunch of weapons, knew about monsters, had weird conversations in the bathroom, and then there was Ruby's warning…"

"She's not a monster," Percy found himself saying somewhat defensively, "I know what you two think about people like us, but we're more human than god or anything else."

"I know," Sam said, "It's always more complicated than just being this or that."

"Your brother doesn't think so."

"He does…sometimes." Sam frowned, trying to find the words to explain, "He has to create structure. It keeps him sane. Most hunters have to to be honest."

"Not you though?"

Sam shook his head, "I don't know how much you've gathered, but Dean and I have had an interesting past, even for hunters. I have a history with demons that would make most hunters put me down. The only reason they don't I think is because we're more useful alive than dead."

Percy smiled back hollowly, "I know the feeling. Back in my world, my existence considered less than ideal since I'm the son of one of the Big Three."

"Big Three? Zeus, Hades, and Poseidon I'm guessing?"

"They made a pact not to have any more kids because we caused too much trouble. We're really powerful." Percy looked down, "I think that's why Aella was never claimed. She's not the daughter of one of the Big Three, but she's a legacy and the daughter of a god. Her dad probably didn't want to draw attention to her."

"When you came here, what was your plan? How were you going on saving her?"

"I figured I'd just grab her and yank her back through a portal. Her body is still alive after all. I thought maybe if she came back to my world, she'd just fall back into her body and everything would be fine but then I found out about the monsters from our world invading here and I knew I couldn't just leave with her. We had to figure out how to stop them first."

Sam was silent for a while. The shouting from the room seemed to have stopped, but neither Dean nor Cas had appeared.

"What do you do at that camp?"

"Train to be heroes."

Sam looked back at Percy, giving him a small smile, "I can tell. Listen, it's going to work out. Once Dean decides he's going to do save someone, he doesn't change his mind."

"Save? He only said that he was going to help make sure her soul wasn't captured."

"He didn't say he wasn't going to try to save her either."