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. I just wanted to post SOMETHING before I disappear for all of August, so I'm sorry, but this story will not be regularly or quickly updated. The going's been slow, guys. :/

It was a whole year before things went to Hell.

Over that time, where Castiel, Dean and Sam all lived with Azazel and Alistair, the two Angels' season became synced, like women with 'That Time of the Month'. Normally, this wouldn't be much of a problem – with Dean being incapable of carrying young and Sam having no interest in impregnating the older Angel, there were no worries about procreation. And Angels tended to become more obedient and submissive during their seasons, eager to please their dominant counterparts and so didn't cause much trouble.

But there was some confusion between the Angels. In their culture, the submissive bore the mating mark and therefore that Angel was quieter, and their mates became more aggressive and protective during their seasons. This didn't work when Castiel's submissive bore the mark of another, more dominant male, as well as giving Castiel his own mark.

In human terms, they were both 'versatile'.

This was practically unheard of in Angelic society. Dean was okay, because he had Sam to keep him in his place, but since Sam practically refused to touch Castiel without Dean as a buffer between them, the older Angel had no one to keep him in line.

It was normally manageable things; he'd be a little more assertive in bed or more aggressive towards Alistair and Azazel, but once, a year after Michael, when Castiel and Dean were both in season and Castiel had gotten into a physical fight with Sam over Dean, Alistair couldn't take it anymore.

"They practically destroyed half the apartment!" he growled, and that was an understatement; the windows had either been cracked or shattered completely, when Sam had punched Castiel hard enough to send him hurtling towards the window. There were large holes beaten out of the plaster, and most of the lights had burst, overwhelmed by the flux of the Angel and Demon's powers. "I let it go for this long, but not anymore; that creature is dangerous and we need to either get him under control or sell him."

Azazel sighed, munching on a strip of bacon as he looked towards the closed door to the second bedroom, where Castiel had been sent until both he and Sam had cooled down. Sam was in the master bedroom and Dean lay curled up on the couch in the living room, separated from the both of them. "I agree, but we can't separate them permanently – they're mated or bonded or whatever."

Castiel had been collared, as were the laws of the city, but they hadn't gotten a tattoo to bind him to either Azazel or Alistair. The reasons were quite simple – Azazel owned Sam. Getting an Angelic tattoo for Castiel would be like he was replacing Sam and the Demon was remarkably territorial at the best of times. But then again, Alistair had gotten his tattoo for Dean replaced – they had no idea what would happen if he had a tattoo for each of them and controlled both Angels separately. It had never happened before – the link between Master and Angel was quite taxing already, and they had no idea what would happen if Alistair had both the Angels under his control, or if it was even legal.

"Look, what if we…like…combined the tattoo, so it worked for both Dean and Cas? That can be done, right?" Alistair asked, stirring his lukewarm coffee absently, his eyes also locked onto the door to the second bedroom. "It's either that or sell him, and like you said, I don't want to risk breaking up a bonded pair like that." Say what you want, Alistair did care about his companion – Dean had them all wrapped around his little finger like the baby of the family.

Azazel sighed and nodded. "I think that's the best option we have."

Hearing the words his Masters were speaking, Dean didn't like where the conversation was headed one bit. They couldn't take Castiel away! They couldn't; Dean wouldn't let them. Something had to be done, though, because Castiel refused to listen to orders. If Dean could convince him to behave, maybe then he could stay…

Dean pushed himself up from the couch, padding over to the second bedroom, and he let himself inside quickly and quietly, unnoticed as the humans went on about their day.

Cas… Dean's wing brushed gently with the other Angel's, and the younger male purposely ignored the flinch that Castiel gave at the contact; he was too aggressive today, and jumpy, his season making both his hormones and his pheromones jump all over the place, but still Dean persevered; You must calm down. Please. Sam and I need you here; please don't make them take you away from us.

The smaller, older male hissed, his wings flexing already in defense, as though daring to let them try. Dean tried to calm down his mate by brushing their wings together again. Castiel was sitting on the side of their bed in the second bedroom, so Dean kneeled between Castiel's legs, resting his hands on the other Angel's knees, bright eyes beseeching when he looked up.

Please, be good. For me. For us. I can't live without you. And to many a human that's a cheesey, over-used sentiment, but to Angels it's very serious – and also very possible. Trying to separate life-mated Angels can often result in death from heartbreak. Castiel and Dean weren't quite mates when Dean was lost to Michael, but now they definitely were and separating them could end in catastrophe, especially if it's by violent means.

I love you, Cas…

Show me. In a blink the usual gentleness in Castiel's eyes was gone, replaced by black lust and want. Dean shivered under his mate's possessive gaze, but didn't break eye contact as he slowly leaned forward, mouthing at Castiel's rapidly hardening cock through his jeans – the Angel had taken on the more casual attire worn by Dean and Sam. They both seemed to approve of the tight-fitting jeans and thin t-shirts, and Cas enjoyed bringing out their jealous sides by flaunting it.

Castiel's eyes closed and his head dropped back, a gasp escaping him at the wet heat of Dean's mouth. Dean slowly, gently rubbed circles in Castiel's thighs with his thumbs, the rest of his hands massaging the Angel as he licked at, bit at and blew on Castiel through his clothes, making the Angel wish, not for the first time, that they were both significantly more naked.

Dean's fingers deftly unzipped Castiel's jeans and unbuttoned them, sliding the confining garment down until Castiel's hard cock sprung free – all three of the creatures had long ago dropped the need for underwear.

Immediately Castiel fisted one of his hands in Dean's hair, pulling the other Angel down, and obediently Dean parted his lips and swallowed his mate in one long dive, relaxing the muscles of his throat; he kept going until his nose touched the wiry black hairs around the base of Castiel's erection. The older male quivered, muscles clenched tightly from the effort of holding off his orgasm as Dean's talented mouth went to work – when one had two dominant mates like Sam and Castiel, one learned how to give one hell of a blowjob very quickly.

The scent of Castiel's season was heavy in the air when Dean inhaled, humming gently around Castiel as he lifted his head and sank back down, swallowing everything the older Angel had to offer in one go, throat relaxed around his mate's erection. Dean's hair had grown longer over the months, and Castiel fisted the soft brown as he directed Dean's head, getting the angle and feeling he wanted with a few alterations. Dean was pliant, letting Castiel fuck his mouth, his fingers knotted tightly in the bed sheets outside Castiel's thighs as the older Angel grunted, stilled, and came down his throat. Dean wasn't allowed off until he had licked and swallowed every drop.

When Castiel's hands loosened in his hair, Dean pulled off, stretching his sore jaw a little and he smiled up at the older Angel, who was flushed from his orgasm, sweat beading at his temples. Dean pushed himself up, so he was kneeling high enough to kiss the other Angel, and Castiel eagerly met his lips in a sloppy clash, biting at Dean's mouth until the younger Angel opened for him and Castiel could taste himself on Dean's tongue. He purred into the black-winged Angel's mouth, pulling Dean upright to straddle his lap.

Please, please behave… Dean murmured the words through their bond, one of his hands lightly stroking Castiel's ruffled silvery-black feathers, soothing his mate as he continued to come down from his high. I want you to stay with us. Don't make them take you away.

Castiel was silent, and for a terrifying moment Dean thought he would refuse, but then his shoulders slumped, and he nudged his assent.

Very well.

Alistair took Castiel with him the next day to get his tattoo altered so that it would work for both Angels, and Azazel went to work without Sam or Dean. This left the young Angel with a very pissy and pouty Demon to deal with.

Unfortunately, as Dean and Castiel had become in sync with their seasons, for five days every three months Sam was surrounded by the scent of two very potent Angel seasons, and it was driving him absolutely insane. Azazel, once he'd figured out why Sam got so aggressive at these times, had tried taking him away, getting him out of the house to release all the sexual energy that such a dominant male like him was bound to build up, but that didn't work well because Sam was convinced; convinced, that if he left Dean and Cas alone for any length of time they would get closer together, and no one was taking Dean away from Sam.

It was a completely ridiculous notion, of course, that Dean would just take Castiel and Sam would be left on his own, but many fears are irrational. It was up to Dean to try and cure him. It didn't help that Sam had learned about the joined tattoo Castiel was getting, which would, in Sam's eyes, bind him even more closely to Dean.

You're a fool, Dean growled into Sam's mind as he descended again – the Angel never needed to breathe, it seemed – and swallowed Sam whole, his nose brushing against Sam's abdomen as he twisted his head. To think I would leave you. To think you wouldn't be enough.

God…Dean…

Sam growled, fisting his hands tightly in Dean's hair as the Angel swallowed him down, pretty pink lips stretched over his cock as Dean's head bobbed in a slow, maddening rhythm. Sam wanted nothing more than to force Dean's head down, make him swallow and take it, but that wasn't the game today. Today, it was about Dean showing Sam that he was appreciated; wanted.

Blowjobs often worked quite well.

Sam's hand tightened in Dean's hair, just a little. You are bonded to him. You will share a Master. And yes, so his voice may have sounded slightly pouty. Sue him.

Dean hummed a little, the vibrations going right up Sam's spine and the Demon hissed, clenching his hands again in Dean's hair as he pulled the Angel off – blowjobs are nice, but that's not the way Sam wants this to end and they both know it. Dean gave a little knowing smirk as he pushed himself to his feet in one smooth movement. He was still fully clothed, a fact that Sam intended to change, but Dean beat him to it. He dodged out of the way of the Demon's questing fingers and crossed his arms over his stomach, catching onto the hem of his t-shirt and pulling the garment clean over his head, letting it drop on the floor.

Dean's skin was glowing, almost; golden-brown despite his lack of time in the sun, and completely unmarred with scars and blemishes. Perfect, powerful muscle slid and shifted under that thin layer, all that coiled energy compacted into a beautiful vessel. Sam's eyes flickered to black as they devoured his mate hungrily, and when the Demon met Dean's eyes, he was pleased to see his mate blushing under the scrutiny.

The Angel shed his jeans hastily, glad for the fact that all three of them seem to have decided against the need for underwear ever – they have sex at least twice a day, regardless of season, and underwear just gets in the way. Within a second Sam was with a lapful of fevered Angel, Dean burning hot and needy under his fingertips as Sam caught a hold of Dean's hips, pulling the Angel down so that his cock could settle firmly against Dean's. Friction sent them both moaning and shuddering.

You have no idea… Dean shook his head, his lips finding the pulse in Sam's neck and nipping there, hard enough to feel but not to mark – Dean wore the mark, he was the submissive, not Sam. Do you even…Sam… Dean's voice was affectionate, if a little exasperated. You know…I made my hair longer, for you. I know you like having something to hold on to. Not for Cas; for you. And when I am troubled in my sleep, it's the darkness I press into, not the light. You saved me, you marked me. I am yours. I have always been yours. Dean's beautiful ebony wings stretched around Sam, encasing him in his heated Grace. Please believe me.

You are bonded to him, Sam repeated, nuzzling into the mating mark that was permanently on Dean's neck. You have a connection with him that I cannot understand; will never understand. You are more his in more ways than you were ever mine.

Because of Grace?

Sam didn't answer; couldn't answer. His very soul roiled and raged at the thought of that beautiful, blue-eyed Angel stealing his mate away, but he felt powerless to stop it. He could only throw all his love at Dean and, at the same time, shut himself away, lessen the blow before it came.

I am yours. Dean's voice was soft, gentle as he brushed his lips against Sam's, feeling how the Demon's body relaxed under the intimate touch; Dean pushed all his love towards Sam, as hard as he could, as well as the devotion and unswerving loyalty the Angel felt. For all the dominance the Demon possessed, kissing was the one thing he let Dean take the lead in, having never been predisposed to it, and even a year later he was still a learner. Dean suspected it was because Castiel had taught him how to kiss – yet more proof of Castiel's claim – that Sam hesitated in engaging in it. But it always left them tingling pleasantly, backing up their bond as their bodies got as close as they could.

Dean shifted on Sam's lap, his knees on the mattress as he allowed Sam's cock to settle behind him, close to nudging at his entrance but not quite. Dean placed another gentle nip to Sam's neck, nuzzling and inhaling at the Demon's scent like he would die without it.

Let me show you.

Sam complied readily; Dean was still loose from the wake-up sex the three'd had earlier that morning, when Sam had fucked him slow and deep, and then Castiel had had his turn. No doubt Dean was still wet, slick and open up there; a theory that was proven when Sam slid in with barely a hitch.

When Dean was in season Castiel and Sam alternated between mating with him, the Angel always coming apart under their talented hands and mouths. Their styles were so totally different; Castiel was dirty and harsh, driving Dean crazy with sex talk and filthy promises whispered through their mental link, guaranteeing that if Dean behaved he would fulfill each and every one of them.

They were working through a list.

Sam, on the other hand, was gentle and slow. He would be the type to tease for hours, backing off and driving forward, until Dean was begging, pleading, for release from him. Sam was usually merciful and would give it, but sometimes…sometimes, he'd leave Dean ticking over. The young black-winged Angel was absolutely breathtaking in his submission to his two mates, when he finally came apart after hours or days of exquisite torture.

One thing Sam and Cas did have in common – they liked to bite.

Hard. And often.

Dean almost looked like a skewbald by the end of their first week, after the reunion following Michael. If Alistair or Azazel noticed they paid it no mind and made no comment, and Dean suspected they did know; the walls were very thin in the apartment.

But anyway, that worked out pretty well because Dean…well…Dean liked to be bitten.

The Angel moaned loudly when Sam's teeth sank into the ever-present mating mark on Dean's neck, larger and darker than Castiel's which adorned the other side, as he took a firm hold of Dean's hips and worked the Angel up and down, driving into him as deeply as he could in that position. He wanted nothing more than to just throw Dean onto his back and pound into the Angel until there was no doubt for either of them who belonged to who, but he wouldn't, couldn't; missionary was one position Dean still refused to do, still freaked out about because he hated feeling trapped like that. Sure, Sam or Castiel could restrain him, talk dirty to him, hurt him and bite him and do all sorts of unspeakable things, but if they tried to do any of this with Dean on his back, the young Angel would freak out. Their first few and only attempts had ended in violence and Dean refusing to touch either of them – or let them touch him – for days.

Dean's Grace enveloped Sam's dark soul as they made love; slow and unhurried and long – a change of pace for them.

I love you, Sam…So much…Love you. Yours. Mine. Sam…

Encased as he was in Dean's light, in his mate's tight heat and warmth and the beautiful downy cocoon of his wings, Sam buried his face in Dean's neck, growling out a broken moan as he came inside of his mate. Dean didn't comment on how the Demon's shoulders shook; he merely stroked his hands through Sam's hair until the Demon made him tremble with his own orgasm minutes later. The two of them collapsed, sated, on the bed, and didn't wake up until Cas and Alistair returned home.

Things were looking up from there. Castiel had finally learned to calm himself down, now that he was bound to Alistair. Sure, where were the occasional disagreements between him and Sam, much like when Dean had first moved in, but for the most part they lived in an easy cohabitation, mostly to keep Dean happy – Dean loved them both, and they both loved him, so they were able to put up with each other for the most part to keep their mate loved, safe and content.

Until it all went to Hell, as I've mentioned previously.