A/N Shout-out to Emi for being my first reviewer! I'm glad you like my fic :D Thank you so much, like you don't even know how that simple message just made my day. ^_^ Anyways, back to the story...

"Peter" Lucifer and Cas claimed simultaneously. Dean reached in his pocket and grabbed his gun. Instantly, Cas grabbed again for his angel blade but was sad to find it missing yet again and wielded instead by Lucifer to his left. He reminded himself to get pockets that closed.
"Castiel," Peter began, "Working with the Devil now are we?" He looked around the group. "And the supposed King of Hell." He glared at a pathetic looking Crowley. "I guess it's at least a step up from the Winchesters, but it seems you're still with those tyrants too." As he spoke, Sam stilled his body and reached down into his pocket for Ruby's Knife, but couldn't find it. Luicfer wouldn't have taken it, would he? "Why do any of you think yourselves worthy to enter heaven?" Peter asked genuinely with a hint of condemnation.
"Open the gates Peter, and you will not be harmed," Cas offered. Peters condemning gaze turned to Cas.
"Castiel, look on your sins-" the area around Cas seemed to spin with increasing acceleration until the colors of the world turned to grey and everything stopped.

Death. Hundreds dead, at his hand. It was all for a greater purpose, ho told himself. It was necessary, necessary to kill hundreds of angels, necessary to become God in a Godless universe, necessary to massacre thousands of humans who did terrible things in the name of God. Castiel would fix things. He would kill every last angel if it meant peace for humankind. He would do...whatever...necessary...

Castiel was on the ground gripping the sides of his trench coat and shivering. Dean dropped his weapon and knelt down to Cas. "Cas, CAS, come on snap out of it," he turned to Peter, "What did you do to him?" He barked.
"I am simply showed him his sins, so that he may know why exactly he will NEVER be allowed into heaven again." He bellowed, loosing some focus on his hostage. Lucifer noticed this, and took care to divert Peter's attention even more, if only to give Sam time to kill him or escape.
"What about yourself?" Lucifer asked, "what makes you worthy of heaven if you welcome people like this?" He pointed to a withered Cas. Peter's gaze turned disgusted.
"You, Satan, you worthless perverted fallen scum, ask me of my worth? Look to YOUR sins Lucifer." He spat the last word out as if it were dirt in his mouth.
Lucifer fell to the ground, and all at once, like a grey mist, the world around him faded into a deep, dark red. Flashes of memories flew before him.

"I cannot love them as I love you, do not ask me to father." ... Falling, falling, he was falling, his wings burned away as his soul burned through his body. He couldn't make out the sight of the world but to say what must be ground, but when he meant to crash he only phased through the earth and fell even further, further, down into a deep deep red, slamming full force into the bottom of an eternal fire blazing all around him...ripping at his soul...

...

Massacre... A swift massacre of demons as they submitted their lives for this... A summoning of Death.

...

Sam...he had to find Sam Winchester...his one true vessel.. He would search to the ends of the earth.. He was free...now it was time for revenge... He would destroy every single human on the face of the Earth and show his father just how hideous the humans could be...

...

Sam was screaming inside him... DEAN...DEAN... With every punch he threw at the prodigal son. He was a foul, self-righteous human.. But the more he hurt Dean the worse Lucifer felt... He was hurting Sam... He could feel Sam fighting him... Maybe he could learn to understand Lucifer... Maybe...

...

Peter grabbed Sams neck under his blade and started choking him. He stared straight at Dean. He swallowed hard.
"You take your damn angel hands off my brother or I swear—"
"You'll what?" Peter began, gripping Sams neck tighter so he gasped for air, clawing at Peters hand. Lucifer looked panicked as he wielded Cas' angel blade. At the ready he mentally prepared for any situation, he could throw the knife for a quick distraction, or he could run at Peter and stab him straight on. At any rate, Lucifer was ready for anything. He would not let this peasant Peter take Sams life. "You Winchesters are so —" Just then Dean shot Peter in the chest, Sam fled toward Lucifer and Cas ran up and grabbed Peter before he could move. Cas grabbed Peters blade and held it to his back.
"Finish that sentence and it will be your last." He growled. Deans bullet had stalled Peter long enough for the tables to turn and that's all he needed. "Where are the gates?" Cas interrogated. Peter merely gave a smug smile.
"He asked you a question douchebag." Dean yelled. He wielded his gun again.
"The gun worked so well the first time." Peter teased. Cas maneuvered the blade to his throat and made a small slit in Peters skin. Dean cocked the gun.
"Melted angel blade bullet, little trick I learned from a friend. Trust me, I don't miss twice." Dean threatened, getting cockier by the second, Cas enjoying the tag-teaming.
"Just open the gates for us and you walk free," Sam offered. Lucifer grinned as he petted Sam's hair. "That's all we want, we have no other quarrel with you." Peter straightened up.
"I was seconds away from snapping your neck and you tell me this knife to my back means nothing. Save it. I know how you Winchesters roll, and you too Castiel. Metatron warned me you'd come one day to kill me. Kill all angels that's what you want right?" Dean looked fierce but Cas looked hurt.
"Nobody's gonna kill you." Sam offered, "Cas put the blade down." Cas hesitated then lowered the blade. Peter furrowed his eyebrows and stared at Sam and Lucifer.
"Either this is some trick, or heaven seriously misunderstands you two." He said earnestly. Cas sheathed his blade and Dean reluctantly put down his gun. "I still don't understand why Lucifer, Crowley and the Winchesters think they can just waltz into Heaven."
"Well that's for us to know isn't it?"
"Dean," Sam calmed. He turned again to Peter. "We're gonna kill Metatron."
"I knew it, killing more angels. That's all this is about."
"Brother, no," Cas started. "Metatron means to kill all angels, we mean to stop him."
"I can attest to that," Crowley began, "'Metatron' the high and mighty bastard is the reason all angels fell. I know right? And I would've been a million times more ecstatic if you would've all stayed in Heaven thank you. I want the bastard dead as much as the rest of you." At Crowley's soliloquy, Peter seemed convinced. He turned around to Cas.
"Is all this true?" He pleaded, looking like a five year old who's pet just died.
"I'm afraid it is." He said sadly. "But when we kill Metatron, all angels will be let back home again." He placed a caring hand on Peters shoulder.
"I've been keeping watch this whole time, for the man who cast us out?" Dean and Cas nodded. "How, how can I help?"
"Well like we said earlier, if you could just open the heavenly gates? Yeah that'd be great." Dean said.
"I would love to, but I can't. Heaven is locked, for good." As the words left his mouth, all but Crowley looked shocked and annoyed at the same time. Lucifer rolled his eyes in exhaustion.

"Well isn't that just great. Then how the hell are we supposed to ascend into paradise? We had demon wookie and everything! Oh now daddy is going to be so disappointed in me, again," he said sarcastically, looking to Sam. "Unless..."

"There's another way." Crowley chimed in. Lucifer winked at Sam.

"Right on time Chewy. What little scheme do you have planned for us?" He crossed his arms and everyone stared at Crowley.

"There is a spot in Hell, where an Angel, or Archangel can open a straight-shot portal to Heaven." Crowley offered, trying to sound as intelligent as Sam.

"There's no way this kinda stuff was in the library Crowley, how do you know this?"

"Because I discovered it." He said smugly.

A/N So I guess when I said I'd post this chapter Tuesday or Wednesday, I lied. But, I'm a writer so you shouldn't trust me anyways. :P However, I will have the next chapter up very soon and i swear on the life of my otp that I WILL finish this whole fic before school starts, which means like mid-late August. Have a good upcoming week! (OH, ALSO, I intend to have some nice smut coming up in this next chapter... Hmmm...)