Evolution

Sequel to 'Animals': .

Rating: NC-17

Pairings: Human!Azazel/Human!Alistair, Angel!Dean/Demon!Sam, Gabriel/Kali, Sam/Gabriel (arranged), Sam/Dean/Castiel, a bit of Dean/Gabriel. Mentions of Lilith/Lucifer and Rafael/Pam.

Warnings: Animal-like interactions, Wing-porn, Rough sex, Arranged sex under duress, Language, DSM dynamics, Violence, MPreg, OCs that are characters from the show but obviously have different relationships with the others.

Summary: The Archangels on the Earth were running thin. Most of them were killed at birth, perceived as too dangerous or too powerful to keep alive. Gabriel and Raphael were the last ones standing. They needed more; Lilith needed more.

Disclaimers: Nothing is owned. I'm just playing in Kripke's sandbox - or as I like to call it - God's epic sandbox of awesome. I may be convinced into selling my soul for creative rights, however. (:

Please let the record show that I HAVE NOT FINISHED THIS STORY YET.

There was a pitiful amount of information on the Archangels and 'Morning Star' that John was cleared to give to Azazel and Alistair – a fact that agitated the two men greatly. This was their problem, wasn't it? They'd made it their problem, and they had a right to know everything they could – how to fight, what to do…

"He was uncollared, the report says," John muttered, sifting through the tiny pile he'd been able to pull on Gabriel. "Which can mean anything, really, from him fighting himself free – meaning he's doing this vigilante – or being released so that he's not distracted." He rubbed his hand over his face, scratching at his beard.

"Wait, wait," Alistair said, holding his hands up in front of him. "You're talking like these things even have the intelligence to plan shit like this out on their own. Come on! They can't be that smart…right?" He looked to Azazel, seeing his partner biting his lip, unsure. "Right?"

"Sam can speak," Azazel said quietly. "He and Castiel rescued Dean on their own, Alistair. I think they can be as smart as they want us to believe they are."

There was a pause, and all three of the man jumped when the phone on John's desk rang out, shrill and piercing. He sent them an apologetic look before picking up, answering with a terse 'Winchester'.

Another pause, and then another pause, and then one more for good measure, because there wasn't enough tension already…John's eyes widened significantly and Azazel and Alistair leaned in to try and hear the other half of the conversation, to no avail.

"Right. We'll be there in five minutes," John said, hanging up abruptly and standing. "Gentlemen, we've just had a report come in that there's been a break-in in your building, and there's a shitload of Angels surrounding it. I think we need to leave, right now." He grabbed his leather jacket, slinging it over his shoulders as he rounded his desk, leaving the two men to run to catch up, because John is a tall man who takes long strides when he's purposeful and Alistair and Azazel…do not.

"Why all the Angels?" Azazel asked as they followed John into his police car, Alistair taking shotgun while Azazel slid in the back. "I remember you talking about Archangels being really powerful and having effects on Angels when they're nearby, but what kind of effects exactly?"

"Archangels are fucking powerful," John growled, wrenching the key in the ignition and giving a grim smile when it roared to life. "Their Grace is like…well, it's like a narcotic to Angels, or an aphrodisiac - something. The only thing we can tell so far is that any Angel in close proximity to Archangels will immediately do whatever they say."

"So Dean and Castiel…"

"Will likely be influenced by Gabriel, yes."

"What about Sam?" Azazel asked, leaning forward, his fingers curling through the meshing that separated the front of the car from the back. "Do Demons fall prey to them, too?"

"I don't know. I don't think so," John replied. "Not that we've heard of." He turned on the siren, pulling out into the lunch hour traffic and growling at every car that wasn't fast enough to get out of his way.

No one said anything, but all three men were thinking the same thing; this was going to end very badly.

"Ah, Sam, so kind of you to join us."

Sam had run up the stairs to find the door already busted down, an army of Angels waiting for him inside with glowing white eyes, flexing wings and bared teeth. He snarled, low and under his breath so as not to cause a riot, his eyes shifting into flat black as he took stock of the situation.

The apartment was carnage, quite literally. The entire window was missing, torn out of the side of the building like some giant hand had just taken a piece of the wall with it. There were Angels everywhere – on the bookshelf perch that Dean was so fond of, and sitting on the windowsill, and on the couch and in the kitchen, on that little half-wall that separated the two rooms, and in the middle…

Was Gabriel, Dean and Castiel.

Sam growled at the Archangel, fingers flexing into fists and then relaxing by his sides as he stepped forward. "Let them go, Gabriel," he demanded, and the Archangel smirked.

"'Fraid I can't, kiddo. Not until you give me what I want." He had his long silver blade out, and was holding it against Dean's neck, his other hand fisted tightly in the top joint of the Angel's dislocated wing. Dean was panting in a mix of pain and fear, blood running down the side of his face from a gash on his forehead, and Sam could just see the beginnings of bruises forming on his arms – his mate had fought back. The Demon felt a momentary surge of warmth and affection towards the Angel. "Come on, now, Sammy," Gabriel snapped, bringing the Demon's attention back to him. "You know what I want. It would be a shame if your pretty little mate here had to suffer because you were too proud and stubborn to save him." The Archangel knelt down slightly, pressing the blade against Dean's neck so the Angel was forced to lean back against him, and Dean whimpered softly when Gabriel's hand stroked through his feathers, rubbing them softly, but the action was pain around the pale, jutting bone.

Sam lunged forward, intent on killing the Archangel where he stood, but Gabriel cocked his head to one side and suddenly there were five Angels there, pulling him back, holding the Demon away from Gabriel with their combined strength. They bared their teeth and snapped at him, but didn't hurt him – Gabriel needed him healthy, after all.

The Archangel smiled and shook his head, seeing the Demon's eyes flash yellow for a moment under his anger. "You really should calm down, Sammy. Someone could get hurt."

"You don't want him," Sam said, gasping when two of the Angels wrenched both his arms back, straining the muscle. "He's infertile. He can't have children anyway." It was a desperate move, but if Gabriel couldn't use Dean for breeding then maybe the Archangel would just leave his mate alone. "Please, don't hurt him."

Gabriel clicked slightly, sucking in one cheek into his mouth as he made a sound much like one uses calling a horse. "Well, if I can't use him…" The blade pressed harder, and Sam growled, fighting against the hold the Angels had on him. Dean whined slightly when he first felt his skin give and blood trickled down his neck, staining the light material of his shirt. Sam growled again and fought, his eyes searching out Castiel.

The Angel was kneeling at Gabriel's feet, staring up at the Archangel and not doing a damned thing to stop this. This is your own fucking mate, too! Sam growled at the Angel, subsiding with heavy breathing when the blue-eyes Angel blinked slowly at him. Guy looked like he was stoned out of his mind.

"What did you do to him?" Sam growled, jerking his head towards the kneeling Angel. Gabriel's hazel-gold eyes flickered to Castiel and he grinned, taking his hand off Dean's wing to stroke through the Angel's hair, pushing his head back so Castiel had to look up at him, mewling softly. The Archangel's grin widened.

"Oh, nothing," the Archangel said dismissively, letting Castiel's head drop and returning his attention to Sam, still smirking slightly as the Angel curled up closer to him like a fucking dog, nuzzling into his side and the base of his giant white wings. "Angels just have certain…weaknesses when it comes to my breed."

"Your…Your Grace," Sam said, putting two and two together. "Why won't it affect me?"

Gabriel cocked his head to one side; "Why do you think? You don't have Grace, Sammy. And besides, when an Archangel baby does get made, one parent will have to be able to resist it. Now," he said, flaring out his wings before Sam could respond. The Demon watched as, in unison, all the Angels in the room lifted their heads and inhaled the scent, that divine-rich chocolate scent. "You've been wasting my time for too long. It's either going to be you or him. Make your choice, Sammy."

"Please," Sam begged, desperate as he began to struggle in earnest against the Angels holding him, "please don't hurt him. Let him go."

Sam. No, Dean murmured, eyes focused, wide, on Sam, shaking his head vehemently. The Angel's wings flared, knocking Gabriel off balance as he tried getting to his feet, grabbing hold of Gabriel's sword arm. The Archangel snarled, and the Angels around him growled as well, reacting to his mood. Realizing his mate was about to get ripped to shreds at the mob, Sam finally managed to throw off the Angels as their attentions refocused on Dean, and lunged forward, intent on killing Gabriel right where he stood and ending the whole effect the Archangel had.

He hadn't intended on running into Castiel.

The Angel was still under Gabriel's influence, and therefore intent on protecting his 'mate' or 'master' or whatever the fuck the Archangel was to him. He'd gotten up to fight Dean off, and turned when he sensed Sam close. The Angel was just suddenly there, and Sam…didn't know what happened. He didn't.

There was just so much chaos, and Angels were everywhere and it was hard to tell the difference between them and then suddenly Castiel was there, and Sam knew that if he didn't do something, that Castiel would, and…He struck.

He lashed out, intent on getting to Dean before his mate was ripped apart, and Castiel suffered the consequence. The Angel just dropped in a small pool of blood running from his mouth, and Sam didn't have time to really think about it because Dean was still in danger, and by the time he fought his way to the still-grappling Archangel and his mate, and he realized what he'd done, it'd been too late.

Dean felt it, though. He felt Castiel's Grace trickle away into nothingness and gasped, clutching at his chest as he dropped like a stone. Sam just managed to catch him before he hit the floor. Dean was coughing up blood, choking on it like he was the one that was injured, his wings quivering as he pulled them in on himself as some sort of shield. Gabriel abruptly raised his hand, calling off the attack and the Angels around them stilled, sending their 'Master's command. Sam looked up from where he had been holding Dean as his mate frantically clawed at his chest, feeling like he was dying, and met the Archangel's golden eyes. Gabriel was watching them with a calculating look, his gaze flickering between the Demon, the Angel and Castiel where he still lay, untouched and awkwardly sprawled where Sam had felled him behind the couch. He lowered his hand and waved the gathered Angels away, to the corners of the apartment.

There were sirens outside. Sam's vision was getting blurry, feeling Dean's pain as though it was his own, and the tears began to fall as he held his suffering mate close. He tensed when he felt the Archangel kneel down next to them, his hands curling around Dean protectively and pulling him close.

"Don't touch him," he growled, voice breaking on the last word as he glared at Gabriel as harshly as he could, the effect somewhat ruined by the fact that he was about ten seconds away from crying. Dean was sobbing dryly against him, and there was an ache in his gut and in his head from where Castiel was just…missing. The feeling of their Graces snapped apart so suddenly and so brutally was a staggering blow to the young Angel, who felt as though he'd been hit by a semi and then thrown into the path of a combine harvester. Needless to say, they were both wrecks at that moment.

"I'm sorry, Sammy, but I can't do that yet," Gabriel replied, voice soft and Sam hated him all the more for it. The Archangel reached forward, his hand dipping under the base of Dean's wing, around to his stomach, his fingers splaying over the smooth flatness below Dean's t-shirt. The Demon holding him tensed and growled but was kept at bay by the tight hold the Archangel still had on his blade. Gabriel closed his eyes and reached out with his Grace, finding what was making Dean infertile – an underdevelopment in the muscles that, basically, swelled while pregnant, excreting fluids full of nutrients that kept the babies alive, like birds in eggs, and nudging them gently, healing them with his Grace as best he could so that Dean would, hopefully, be able to conceive. He'd actually become pregnant several times, but without those muscles the fetuses never lasted long enough for there to be symptoms.

He pulled away, wings shaking slightly, because creating life or the means for it is an exhausting process, and then met Sam's hate-filled eyes. "If you do this – if Dean bears a child for you, and you give it to me – I will heal the Angel." The Demon's eyes widened, hope stirring just briefly under his skin. The Angel in his arms sensed it, blinking back to his surroundings as he looked up at Gabriel.

"You…Is that possible?" the Demon asked, his eyes going to Castiel's body. "You wouldn't…why would you do that?"

Gabriel smirked slightly, but didn't answer – he stood, going over to Castiel's body and kneeling down beside him, hand on the dead Angel's chest. Sam's breath caught at that – Castiel was dead. He had killed him. God…how would Dean ever forgive him? Even if he did fix that…The Archangel's hand splayed slightly, fingertips glowing when he touched the Angel, and Sam watched as Castiel just…solidified in front of him.

"He won't decay – his body will not be lost over the time of the pregnancy," Gabriel said, turning to look back at the broken pair and standing, wings flaring out to the side as he, one by one, sent the Angels away. "I will be back in one month, Sam, and if Dean has not conceived by that point, then I'm taking him elsewhere, and you'll never see either of them again." Gabriel sighed slightly, running a hand through his slicked-back hair, and gave a wan smile. "It didn't have to be this difficult, you know."

"I'll kill you, you bastard," Sam growled, snarling from where he knelt, still cradling Dean to his chest. The sirens were getting even louder, deafening without the soundproofing of the window. "I'll rip your heart from your Goddamned chest and watch you choke on it!"

"Temper, temper," Gabriel replied, shaking his head. "I'll see you soon, Sammy." Then, he flared his wings and turned, taking off along with the rest of the Angels, the entire apartment momentarily eclipsed by his massive wings before they were gone. Dean gasped in Sam's arms, like Gabriel's influence had been keeping him quiet, and sedated, and Sam immediately turned his attention to his mate.

Dean…Dean, are you alright? Sam asked, cupping Dean's face frantically and wiping some of the blood he'd coughed up. Oh, God, Dean…

Cas…

Dean…I'm so sorry, Sam said, begging Dean without words to understand, to forgive and just understand. I'm so, so sorry…

Cas…God, Cas! Dean scrambled up, turning wide, horrified eyes to the body of his dead mate, and gasped again, damn near collapsing at the sight of Castiel just laying there, not breathing, his eyes blank and staring at the ceiling. No…No! He crawled over to Castiel, propping his upper body up and shaking him, as if Castiel was just unconscious instead of…dead. Castiel…please…God, no…

I'm so sorry, Dean, Sam murmured, sliding closer and then away, pained, when Dean flared his wings, blocking the Demon from touching him, blocking Castiel from sight.

Don't come near him. Don't touch him! Dean snarled, his wings shaking from the effort of holding them up – injured and bloodied – to keep Sam away. You don't get to touch him… Then, there was just the sound of sobbing as Dean pulled Castiel as close as he possibly could, just willing the Angel to live again, to take another breath, to blink or say his name…something.

Nothing happened.

Nothing continued to happen until Alistair, Azazel and John came through the door to find Sam, dejected and sorrowful as he watched Dean, sobbing under a shield of ebony feathers as he held his dead mate to his chest. John immediately ordered his team to do a clean sweep, because if they found any evidence of specific Angels registered to the city, they could maybe get a lead on where the Archangel went, but there wasn't much hope.