There will be six chapters to this story, one to be posted either every day or every other day. Promise.

Omegaverse AU, Destiel and eventual Sabriel. Imagine if John took care of the demon in recent years but was too deep in the life to leave it.

Enjoy!

John didn't know he'd taken the Impala. Sam knew, but he wasn't about to stop him. They'd been in Pontiac for almost a month now, and in the morning they'd leave bright and early. John had just gotten back and crashed for a night of sleep before they hit the road again. Dean had waited until he was snoring up a storm to swipe his keys and duck out. Sam promised to cover for him if their father woke up before he could get back.

Dean drove out to the gated neighborhood across town, the first time he'd actually used the gate as he was supposed to. There was no guard there at this hour, he just had to punch in the code Castiel had given him. The streets were otherwise silent as Baby rumbled passed house after large, fancy house, then pulling into an otherwise empty driveway. The Alpha hurriedly cut the engine, climbing out and trotting to the front door. Before he could do more than reach out to knock the door was jerked open, Castiel pulling him inside and shoving it shut again.

Hands fisted in his jacket as the Omega pulled him towards the stairs, cheeks pink and eyes bright. There were already a few bags by the door, nothing much. Mostly clothes, books, and whatever cash he'd been able to find in his parent's safe. They weren't home tonight, but then they often weren't. It was part of why it was so easy for Castiel to agree to this. There was no one to miss him.

Up the winding staircase they went, feet pounding on hardwood in the otherwise silent house. As soon as they burst through the door of Castiel's bedroom Dean was on him, yanking him into a kiss and jamming his back against the wall. The Omega gave in with a mewl, returning the desperate kiss and tugging at his clothes.

Dean wished he could do this properly, but they just didn't have the time. At least they'd be doing it in an actual bed. He had taken Castiel's virginity in their current motel, but he'd be damned if he mated him in anything less than a nice bed. Considering he'd laughed at the idea of meeting your true mate previously, he was a staunch supporter of it now. Of meeting someone you clicked with even if your first meeting wasn't overly pleasant, someone meant for you and you alone. Someone you couldn't bring yourself to leave behind like every other whirlwind romance you'd had as your family bounced from town to town.

Castiel managed to tug off his jacket and shirt as Dean kissed him breathless, drawing the Omega's own shirt over his head before descending onto his neck. Their belts went next, then Dean's boots and socks. The Alpha dumped his breathless boyfriend onto the bed, taking a moment to yank off pants and underwear in a single maneuver before taking care of his own. Castiel scooted himself farther up the bed before Dean crawled over him, attacking his mouth again. Long, nimble fingers tangled in his hair, a leg hitching itself around the Alpha's hip.

Dean forced himself to slow down a little, running a hand down the Omega's side, combing fingers through his hair and stroking his cheek. Castiel whined impatiently, bucking his hips and nipping playfully at his lip. The Alpha growled a warning at the hint of dominance, even if it wasn't serious, crushing it under an kiss that left Castiel breathless, his lips swollen as he gasped. Still, he'd gotten the desired effect. Considering he'd only ever had sex twice before he was very enthusiastic, not to mention a quick learner.

The Alpha hitched his hips up a little, sliding a hand around until his fingers brushed the crack between his Omega's cheeks. A soft whine reached his ears as his lips curled up in a satisfied smile. Castiel was already wet for him, slick dripping from his entrance in need. He shifted his weight so he could use both hands, pulling both cheeks apart.

"Ready for me, Cas?" he rasped, voice husky with lust.

A needy keen reached his ears as the Omega squirmed impatiently. "Dean, please," he moaned. "Fuck me, knot me, mate me."

The tiny thread of remaining sanity between Dean's ears snapped. It was one thing to fuck an Omega, or even to knot them, but mating them was something else. To have Castiel begging for all three went straight to his already throbbing cock.

A soft cry was torn from the Omega's lips as he sank into his body, slick easing his passage through Castiel's tight channel. He didn't stop until he was buried as deep as he could go, balls pressing against the Omega's ass. Shakily, he bent down to press a kiss to gasping lips, staring down into damp eyes.

"Shit...gods you're so tight," he groaned. "So fucking good, so good for me."

A small whimper reached his ears, but it was a good sound. Slowly, he drew back until only the head of his cock was still inside, then snapped his hips forward, hard. Again and again, he rammed himself balls deep inside his Omega, toying and sucking at dusky nipples, loving each and every moan or cry he coaxed from Castiel's lips. He slowed his pace every now and then, switching to smooth, lazy strokes, only to pick up the pace again when Castiel started to buck and whine desperately. It wasn't quite love making, but it wasn't exactly outright fucking either.

In the end Dean felt it coming sooner than he'd thought, but he didn't slow down. He considered drawing it out even more, tormenting his Omega, but discarded the idea. He could do that later, for now he was on a mission. He'd knotted Castiel once before, making the newly deflowered virgin scream in ecstasy as he was filled to bursting. Tonight they intended to take things one step farther.

"Gonna cum for me, Omega?" he growled, increasing his pace. "Gonna cum on my cock while I knot you?"

Castiel said something, but Dean wasn't quite sure what it was. All he knew was that it sounded enthusiastic and the hands clinging to his shoulders dug in all the tighter. With a snarl in his throat he slammed his hips forward once, twice more, driving himself over the edge. His body shuttered as the orgasm hit, just managing to get the already swelling knot of flesh at the base of his cock inside his Omega before it got too big. Castiel shuddered, then arched on the bed, short nails drawing blood from Dean's shoulders as he cried out in ecstasy. Dean groaned as tight walls clinched around both him and his knot, his cock already spilling cum inside the Omega.

In that moment his head dropped, teeth latching onto the base of Castiel's offered neck. The Omega outright screamed as he bit down hard, breaking skin. The combination of an orgasm and a knot would ensure that this particular bite would scar, would remain on Castiel's neck always. It would mark him as claimed, as Dean's Omega, his mate. Something no one could argue with or dispute, and unless they wanted to die a painful death no one would dare touch him. Anyone who tried anything with a mated Omega risked the wrath of their Alpha.

It was, Dean was 99% certain, something even John Winchester wouldn't argue with.

Slowly, when Dean was sure the mate mark would take, he dislodged from the bite. Castiel whimpered quietly, but remained still beneath his Alpha. Dean gently licked at broken flesh, reaching over to the bedside table to grab a rag and press it over the wound. Castiel had also set out bandages and antiseptic.

Eventually Dean's knot deflated enough for him to draw it out, and he sluggishly crawled around to Castiel's side. The Omega lay still, spent and drowsy, as Dean cleaned the wound and taped gauze down over it. In time it would be reduced to a silvery scar, and while Dean was no stranger to injuries he found himself fussing a little over his newly mated Omega. After several minutes of this Castiel pushed his hands away, sitting up carefully, wincing a little.

Dean put an arm behind his shoulders, supporting his Omega and kissing him tenderly. "Wanna shower before we go?" he murmured, lightly pecking swollen lips.

"Is it going to do me any good?" Castiel mumbled between kisses.

The Alpha smiled. "Yes."

He might dislike the idea of his new mate ridding his scent from his skin, but it wouldn't be a problem if they showered together. Besides, he knew Castiel preferred to be clean, and neither were very presentable at the moment.

Dean coaxed his Omega into the shower, and while he agreed to refrain from fucking him against the shower wall he did insist on pampering his new mate. Castiel was still spent, the mating having taken more out of him than a single round of sex would have, so he didn't put up much of a fuss as Dean massaged shampoo into his hair, then conditioner, then ran a soap-covered rag over every inch of his body. He was a little lethargic himself, but they couldn't just fall asleep cuddling, one of the downsides to this plan. He knew if he did that they wouldn't wake up until long after sunrise, then they'd have to face a mad-as-hell John Winchester. He wanted his father in a good mood when he broke the news to him, thank you. He wasn't suicidal.

Eventually he got them both scrubbed, dried, and back into clothes. Only then did they slowly go back downstairs, Castiel double checking that all the lights were out and his note was on the kitchen counter as Dean took his bags out to the car. The Omega was locking the front door behind him as Dean slammed the trunk shut, walking away from the house he'd grown up in without looking back.

It was a quiet drive back to the motel, but the silence was a pleasant one with Led Zeppelin in the background. Castiel dozed in the passenger seat, though when Dean pulled into the motel lot he was suddenly very much awake. The Alpha glanced at him, and despite his own nervousness said, "Relax, it'll be fine."

No sooner had the words left his mouth than he noticed what Castiel was now staring at. He hesitated, but then reluctantly pulled Baby into the parking spot outside their room. The one John was now standing in front of, arms folded, face set in a frown. A sheepish looking Sam was at his side. Dean glanced at his watch. So much for the standard four hours. The sun was just barely starting to peek up over the horizon, yet here John stood, as bright eyed and bushy tailed as it was physically possible for him to be.

Steeling himself, Dean cut the engine and climbed out. He was the good son, Sam was the one who argued constantly with their father, but on this he had no intention of budging. Castiel climbed out too, but he hung back as Dean went to face John.

"What do you think you're doing?" the older Alpha demanded, voice low and angry.

"Dad, I-

"You know better, Dean. If I didn't agree to taking a dog along what in the hell makes you think I'll agree to an Omega?"

"He's my mate," argued Dean, hackles going up. He hadn't expected the sudden surge of protectiveness, the urge to get between Castiel and his father.

"Just because you think you're in love with him doesn't mean...

John's eyes narrowed. That time Dean gave in, sidestepping until he stood between his mate and John. His father had noticed the bandage. If he'd looked angry before it was nothing compared to the brewing fury in his eyes now.

"What have you done?"

"Dad, please, just hear him out," urged Sam. He was four years younger than Dean at fourteen, and had recently presented as an Alpha. For his part Sam liked Castiel, more than anyone else Dean had dated before. It had been one of many marks in Castiel's favor, that he'd gotten along so well with his baby brother.

"The hell I will," John growled. "Do you have any idea what you've done? Our job is to protect the innocent, not drag them into this mess. Hunters and mates don't work, Dean. How long have you known him? Does he have any idea what you've gotten him into?"

"I never lied to him," Dean bit out. He started to say more, but John cut him off.

"The road is no place for this, you know that. The only reason you boys got into this life was because there wasn't another choice. Do you really want to drag an helpless Omega into this?"

"He's not helpless," Sam protested, putting in his two cents. "We trained him. He can hunt too. Plus it could be handy having an Omega. Right?"

John's eyes narrowed at his younger son. "What do you mean you trained him?"

Seeing his chance, Dean turned so John could see Castiel, but he still stayed between his mate and his father. "Ask him yourself."

John was quiet for a heartbeat, then in a brusque tone asked, "How do you kill a vampire? Garlic or a cross?"

Castiel frowned, head tilting slightly. "Neither. You have to cut off their head. It's also how you kill a ghoul."

"Werewolf?"

"Silver. It's also effective on shapeshifters, dijnn, and wraths."

"Wendigo?"

"Flamethrower."

"Pagan god?"

"Evergreen spike."

"Ghost?"

"Salt and burn the bones."

"And you fend them off how?"

"Iron and salt."

"Demon?"

"They don't like holy water or salt, can be contained in a Devil's Trap, and can only be killed with a special knife. The exorcism is...

Dean was very proud of how well Castiel was doing, especially when he proceeded to recite the entire exorcism perfectly. Both he and Sam had worked with him for days until he could say it in his sleep. His Omega didn't crumble under John's scrutiny, remaining respectful but unwavering. It was better than Dean could have done. Alphas, even young ones, tended to bristle at a challenge. It might throw things off to bring an Omega with them, Dean knew, but he refused to leave him behind. Besides, there could be some benefits too.

John stood there, arms folded, face still a thundercloud as Castiel finished the exorcism. The Omega fell silent when he was done, lowering his gaze respectfully. They waited, Dean still tensed, Sam watching their father worriedly.

"Do you know what you're getting into?" John asked at last.

Cobalt eyes lifted to stare at the older Alpha. "Yes."

"They mentioned hunters have a high fatality rate?"

"Yes."

"And you still want to come with us?"

"Yes."

John scowled. "You're insane."

"I have been told that before. I prefer to take it as a complement."

"See? He's as nuts as we are. He'll fit right in."

John shot his oldest son a look. "We need to leave. You can come, for now. I'm not promising anything."

Dean relaxed. He could work with probationary. He could bring John around, he was sure of it. Even his dad couldn't turn his nose up unmistakable perks of having an Omega on board. Less fights, for a start. Omegas had a calming presence, could manipulate the volatile emotions of an Alpha. No less than three fights had been cooled down between Dean and students who'd thought to pick on his gawky brother since he'd started courting Castiel. It also could be useful when they were questioning witnesses or getting information from various law enforcement officers. Despite being a little awkward and possessing a questionable filter Castiel still had the calming air that put folk at ease, and he genuinely cared about people, they could sense that. As for police and other agents, they tended to be either male Betas or other Alphas and there was always the obligatory head butting. They didn't see an Omega as a threat, just someone to help so they could make the extra nuisance go away. While John was gone Dean and Sam had picked up a ghost case locally, opting not to tell John until afterwards. By then the brothers had already started training Castiel, and had hit a wall getting information from the police. As an experiment they'd sent in the Omega, with impressive success.

Castiel hung back, staying out from underfoot as they made quick work of moving out. In just under ten minutes they were slamming the trunk closed, John sending Sam to return the keys to the front office. Dean didn't think much about it, but Castiel was very comfortable with them. Too comfortable, as far as John was concerned.

He was coming out of their room, a overlooked silver blade in hand, when he noticed a shift in the back seat. The Alpha paused, peering through the window. Castiel was curled up on the backseat, hands pillowing his head, eyes closed, apparently sound asleep. He smiled tightly, going to toss the knife in with the rest of their stash. It wasn't just their late night romp that had worn him out, Dean knew. The decision to mate and walk away from his life wasn't one Castiel had made lightly. More than one night of sleep had been sacrificed as he worried over the choice. The bags under his eyes were heavier than usual, his face paler. Apparently the nap on the ride over had given him the boost to impress John, but he'd finally crashed.

John came out of the room, shutting the door and striding out of the car. Sam was trotting back as Dean reached for the passenger door, grinning. The youngest Winchester didn't seem to care Castiel was taking up the lion's share of the back seat, hopping in and slamming the door.

"Is he sleeping?"

"We didn't all get a solid four hours last night."

"Leave him alone," Sam protested.

"I'm fine." The protest drifted from the backseat, weary.

"Go back to sleep, Cas," Dean ordered as John started the car.

"Where are we going now?" Sam asked, trying to divert the conversation.

"Maine."

"What are we hunting?"

"I'm going to hunt a werewolf. You'll be going to school."

"But dad-

"No buts."

Dean grimaced as Sam started to protest farther, only to be cut off by a rough, "Reading list."

John twisted to glance back over his shoulder. "What?"

Sam made a face, flopping back in his seat and folding his arms. "I was going to make my own reading list for the summer."

Dean rolled his eyes, turning to look out his window. In his opinion it was just his brother geeking out, but Sam was proud of it. He had teased them for a while, but then he'd come back to the motel one day to find his Omega and his brother sitting on one of their beds, heads bent over the list and Sam's laptop. Castiel was something of a bookworm himself, retreating into various fictional words over the years as a coping mechanism for severe loneliness. Dean had had to use a proverbial crowbar to get Castiel out of his shell on more than one occasion, but it seemed to be something for him and Sam to bond over.

"Why do you want to make your own reading list? Doesn't the school assign you one?"

"He reads those during the school year."

"Why?"

"How should I know?"

The bickering continued, but it was the familiar kind, familial and forgotten as soon as it was over. Castiel slept for several hours, stirring when they stopped for lunch. John seemed resigned to his presence by then, and most of the tension had leaked out during the day. Dean hoped it was prophetic.

Please Review!