Disclaimer: I do not own Jupiter ascending or Supernatural.

Haven't seen a crossover of these two so I thought I'd give it a go. Fair warning, updates will be slow. Begins pre-movie by many years.

Chapter 1

Marria looked at the birthing units, seeing the tiny bodies within and smiled, she loved her work. Winchester Wolves, that was what people called her children, they were the best of the best when it came to tracking and fighting. The only ones who came close to hers were those made by Torus Morrown, he was good, but she was the best when it came to lycantants. That was what let her be…eccentric, she never named them in the traditional manner. They all had the name Winchester and their personal names were not links to their breed of splice like others.

There had only ever been one mistake, a borderline runt, and yet John had proven to be one of her best. He was her favourite, he may be a little smaller than his siblings, but he had proven to be strong as he grew. She had sold him to the Legion at only a small loss for the possible defects, but he had proven everyone wrong. He hadn't been one of the top of the elite, a Skyjacker but he was a Colonel, even if he was pretty much retired now. She had added some of his genome to this newest group, hoping for another who was just as good as John.

She looked over and nodded as John joined her, looking at the birthing units. His arm brushed hers and she smirked, he was also very good in bed. "You're just in time," she told him as the units began to beep and her assistants went to work, bringing the newest lycantants into the gyre. They both frowned as a fuss was made over one of the units, going down to see what was wrong. John reached past the flustered assistants to gently lift the baby from the unit and cradle him close. He was whining, seeking heat, and John let him have it. Marria looked down and frowned, he was small, and the fuzz of hair was a lot lighter than she had seen on any of the others, had she actually bred a true runt?

Tests were quickly run on all the babies and it was confirmed, he was a runt. She was disappointed, all that work had been wasted.

"Give him a chance," John looked up from the baby.

"He's a runt, defective," came the murmur from the other but Marria looked at John.

"He'll make it," John stared at her and she sighed.

"Give him six cycles, then we'll review," she offered in compromise. She trusted John to know what he was talking about, he was a soldier and he knew soldiers, obviously he saw something in the pup. "Going to name him too?"

John looked down at the tiny pup in his arms and smiled, "Dean."

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Dean watched his siblings as they played around, leaving him out. Whenever he tried to join in he was pushed aside. They were all bigger than him, darker haired, stronger… he cocked his head as a familiar scent reached him and he smiled, scrambling for the doors. They opened, and John entered the creche, looking them all over before looking to Dean who scrambled to his side.

John knelt and ruffled his hair and Dean grinned, moving in and John picked him up even as the others went back to their play. "Hey pup, you good?" he asked, and Dean nodded, burrowing into his warmth. "Think you can help with something?" Dean looked up and nodded seriously and John hid a grin at how cute hit made the other lycantants look. John put him down and then went out before coming in with a tiny form in his arms. Dean inhaled the familiar scent of another Winchester wolf and saw the dark hair on the younger pup. John sat, and Dean sat opposite him even as he set the small pup down in his lap. "Dean, this is Sammy. His brothers are gone, think you can look after him?" John asked softly.

This was Sammy's only chance. The others of his group had died in the birthing units for an unknown reason. He was pale, like Dean and John, but with darker hair and eyes, and he the data seemed to think he'd grow to normal size if he survived. He wasn't thriving at all so John had suggested moving him to the creche where he could be socialised. He was young, but it was this or he would die.

Dean stared at the younger lycantants curiously, green eyes meeting hazel. And then the smaller boy giggled and reached out clumsily to him, shocking John, who smiled and held him out to Dean. Dean hesitantly wrapped his arms around him and felt him burrow in, clutching his shirt in one tiny fist.

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Marria Winchester looked in on the creche, seeing the two small boys off on their own. It had been a crazy idea…but it had worked, like most of John's ideas did. Little Sammy was finally thriving and growing, and Dean was obviously loving looking after the younger Splice. They still didn't know what had killed off the others in his group, but Sammy was perfectly healthy and growing fast. The problem was, Dean was old enough to begin intense training and Sammy wasn't. She should just separate them, risk the potential loss if Sammy couldn't handle it, but… there were jobs were a pack of two would be useful.

Lycantants needed a pack, it was their centre of gravity. Without a pack they usually wasted away and died, unless they became utterly fearless, relentless, the perfect hunters. Could there be a pack of just two? John seemed to think there was something to the idea, it had been his idea to introduce them. So, she either held Dean back from training or she pushed Sammy in younger than any would recommend. Either way she risked losing both of them. It all came down to her choice, John was off with the legion because the campaign on Thetan IV had gotten out of control. He'd paid off his gene debt cycles ago, he owed the legion nothing, and yet he kept his contract open to them, willing to work and help them. She sometimes wished he would stay with her only, but she couldn't afford the scandal of being too closely associated with one of her own Splices.

Six days later the boys were taken out of the creche and put into training as a pack of two.

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Dean growled in warning, pushing Sammy behind him, despite the younger lycantant now being the taller of them. That didn't matter to him, he was meant to protect Sammy and he would. The three other boys snarled back and moved in and Dean launched himself at them, fists and feet flying. But despite his training, they were bigger than him and he was pinned down. And then Sammy was there, yanking the one about to pound him back before hitting him hard and putting him down for the count. They went back to back, taking down the older boys, not seeing the trainers who watched in interest.

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John gently corrected Sammy's stance and then stepped back, watching as he lifted the mauler and took aim at the holographic targets. John smiled in pride as he opened fire, hitting eighty percent, and then glanced at Dean who was grinning widely, proud of the younger boy. Sammy stopped as the last target vanished and looked at them, seeing the smiles he blushed and put the weapon down before Dean pulled him in, reaching up to ruffle his hair.

"Good job," John praised and then Dean took his turn, he hit a few more than Sammy had but that was fine. Sammy was only twelve cycles after all, and in the middle of a growth spurt.

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Marria lay back in John's arms, feeling relaxed and content, the antigrav turned off so they actually rested on the bed itself. "The recruiters come tomorrow," she murmured as she traced lazy patterns on his arm.

"I know, you want to know if the boys are ready?" he asked, kissing her shoulder.

"They are young, I could hold them back until the next trip."

John hesitated, it was so tempting, those boys…they felt like his own sons, something he had always known he would never have, he'd been sterilised as a pup, as had Dean. Sammy hadn't since he had managed to survive when others had died, and he wasn't a runt or borderline. His lighter skin colouring could be considered exotic, so he had been left the ability to breed one day. Sammy had grown tall and strong, Dean was also strong, despite being a runt. They were both smart too, above the average in their areas. Sam could do with longer training, gain some more muscle as he got older but…Dean was the same age John had been when the legion bought his contract. As a runt he would sell for a loss and if he got much older they may not buy him at all. Life in the legion was not at all easy but they boys were adaptable. "No, if they are going to take Dean then it will be this trip."

"Very well, I will add them to the list. Now let me take your mind off your boys," she nibbled the sensitive, pointed ear and John rolled them over.

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Dean nudged Sammy who nodded slightly, this was what normal training, they both breathed in deeply, scenting, and caught smells usually associated with John when he had been off with the legion. Dean fought the urge to bounce in excitement and nervousness, even as Sammy gripped his arm to ensure he stayed still.

Sammy was nervous, Dean was old enough for recruitment, but he was only fifteen cycles, even if he had hit his growth early. He still lacked the muscle bulk, he was tall and wiry still.

Their trainers started calling the drills and they slipped into the seamless teamwork easily.

In the observation room John watched on in silent pride as Sammy and Dean blew through the exercises with ease. He felt proud of all his fellow Winchester Wolves but these two would always hold a special place in his heart, they were his boys. If he could have children, he imagined they would be very much like them.

Three hours later he tapped on the door to the boys' room and Dean opened it, letting him in. He found Sammy stripped down to his under armour and flopped in the nest on the floor. John smiled and stripped down to his own to join them, curling up and reaffirming the pack ties…for the last time. He knew he might never see his boys again and it hurt.

"Dad?" Sammy whispered, cuddling close, using the rarely used title since they were alone, and John ruffled his hair.

"Legion Recruiters were watching today," he admitted, and Dean nodded.

"Scented them."

"They've bought your contracts, you leave in the morning to begin training."

"But Sammy's too young…" Dean looked to his little brother who curled closer to his Dad and big brother.

"But he has you to look out for him," John whispered, pulling them both close. "We weighed the options Dean, by the next recruitment cycle you'd be too old for them to take."

"And I'm a runt," Dean grumbled, and Sammy growled at Dean calling himself that. "That's what they'll see on my records Sammy, I sold for a loss, didn't I?" he looked to John who nodded.

"Not much of one thanks to how well you work together with Sammy. You look out for each other, follow orders, don't go looking for trouble. If you can get into officer training or even the Skyjackers, then take it," he advised quietly, it was advice he'd given before while training them, but they still listened. The boys slept that night, curled with the only Father figure they'd ever had and John stayed awake, keeping watch over them, imprinting everything into his memory. When the time came he got them dressed, making sure they looked smart before they headed out to eat and then meet the recruiters at the ship.

In the last hallway they were intercepted by Marria who smiled at them, long golden curls pulled back and her clothes simple, obviously headed for the lab. "Make me proud boys and watch out for each other."

Sammy and Dean smiled back at their Splicer, they didn't see her as much as John, but they knew she kept an eye on them. They wanted to make her proud.

John stood with Marria as the legion ship took off, taking with it two packs, the one Dean should have belonged to, and the one he did. Fifteen young lycantants off to serve as they had been bred to.

TBC…?