Okay, this is Part 1 of a double update, but there won't be more for a while. I'd rather not put up Book 2 until I have it all completed, and I'm not really part of this fandom so much anymore. But this WILL be completed eventually, I promise.
"Okay," Sabriel replied, after turning his answer over his mind. "I'll do it."
Erika stared, visibly angered (more so than before). "You're going to help this asshole?"
"What choice do I have?"
"None whatsoever," supplied Remiel.
"There's always a choice," Erika spat. "Just like your people chose to have me whacked five years ago."
"What?"
"Don't play dumb, you angelic douchebag!" She pointed to a thin silvered scar on her neck. "See this? I was ten years old. I'd had a horrible day in school, and I came home - to the only place I'd ever felt happy or safe or loved - and I went into the kitchen to get a snack, trying to make myself feel better, because my day just couldn't get worse. Except it did, because the next thing I know one of your minions has an angel blade held up against my throat! What was his name? Nathaniel? Something like that. But he held a knife to a ten-year-old girl's throat because of what she was, and it dug in so much it broke the skin. I had no idea what was happening; I'd always thought angels were like Castiel. Protectors. I thought they cared." She laughed bitterly. "Yeah. Right. And I was terrified. I couldn't access my powers. I couldn't move. I couldn't even scream. It's pure coincidence that Cas walked in when he did. Otherwise I would have been murdered. And your people don't do anything without orders, and since God fucked off to wherever you archangels have been running the show. And you're the last one. You sent that dickwad to kill me, and now you expect me to believe I'm your only hope? Sorry, but I'm not buying it."
"Your existence was a closely-guarded secret, known only to myself and certain key members of Heaven's higher elite. Nathaniel was not among them. Something of a lone gunman, as you would say. There was a nephilim running around Earth, and none of us were doing anything to stop it. He took matters into his own hands. Understand this: if Castiel hadn't disposed of him, we in Heaven would have."
"Erika," Lo whispered. "If you don't do this, people will die. Actually die, not Winchester-die."
"You're a hunter," Sabriel added. "You save people, I help Loki himself kill them. If I'm stepping up to this job, then-"
Erika turned back to Remiel before her cousin could finish. "I have some conditions. Meet them, and I'm on your team."