Alpha! Werewolf! Castiel and Omega! Human! Dean.

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Edited 1/15/23: Updated tags- Omegaverse. Chase. Castiel is in anthropomorphic wolf mode for all of this. Werewolf-on-human penetrative sex. Knotting.

Dean didn't like running. He was not a jogger, maybe a sprinter if the occasion called for it, but generally not a runner. If given the option of fight or flight, it was a safe bet he'd take the former.

Despite this, he was currently pelting through the forest at a dead run in the middle of the night. The fact that it was a full moon might have been nice, if it hadn't been the cause of his current predicament in the first place. He certainly wasn't out here voluntarily. The Omega had been forced to abandon Baby by the roadside, genuinely afraid Castiel might rip her apart trying to get to him. In his right mind the Alpha wouldn't so much as ding the Impala, but then he wasn't exactly in his right mind at the moment. Dean had known what he was getting into when he'd mated a werewolf, and normally they could be well away from external triggers when Moon Fever hit, but this time they hadn't been so lucky. A single miscalculation, and now not only was an anthropomorphic wolf chasing Dean down through the woods, but his possessive instincts had been aroused by the presence of other Alphas in town.

A howl rang out from the woods behind him, and Dean ran even faster, digging in his toes only to slide in the thick underbrush. It was hard for him to go too fast out here, the trees were thick and he already sported several cuts from branches as he barreled through them. Castiel wouldn't have that problem, he knew. The werewolf hunted out here all the time, running around to blow off steam whenever Moon Fever hit before returning to Dean. He wasn't unlike a big dog, actually. A giant, humanoid black furred dog that liked to curl up around his mate and wagged his tail if Dean scratched him in a particularly pleasurable place.

Dean stumbled through a clearing, completely turned around and not even bothering to try orienting himself. As long as he got as far away from the town as he could, that was all that mattered. He'd resigned himself to whatever the pissed off werewolf might do to him, but he knew Castiel wouldn't be able to live with himself if he'd known he'd turned on humans in his Moon Fever. The Alpha was very benevolent, all things considered. He would turn on you and rip your throat out without a second thought if it was to defend someone he cared about, or even a random innocent, but otherwise he'd never hurt a fly. It was unusual for an Alpha, never mind a werewolf. Dean liked to think it was why they worked so well, he wasn't any more like the classic Omega any more than Castiel resembled the classic Alpha.

There had been no sign of that gentle nature the last time Dean had seen his mate. He'd peeled out of town as the change had hit Castiel, blue iris's rimmed in red as an instinctive rage took him over. Fortunately he'd pursued his fleeing mate rather than rip apart the Alpha who had provoked him, unfortunately Dean had honestly no idea what this meant for him. He was pretty sure Castiel wouldn't kill him, but that was about it.

His chest ached, and Dean could feel himself starting to slow as he gasped for breath. He half ran half slid down a short hill, trying to pick up the pace again when a snarl echoed from behind him. The Omega hesitated, then staggered to a stop. He braced his hands on his knees, dragging in lungfuls of air. It was no use. Castiel was almost on him. Besides, they were miles away from town now. They should be safe...right?

No sooner had he had the thought than something the size of a horse came barreling into the clearing, sliding to a stop a few paces away from the still panting Dean. Slowly, head down, a low growl in his throat, the Alpha stalked forward, eyes glinting red in the moonlight. Dean didn't try running again. There was no point. He focused on catching his breath, straightening slowly as the werewolf approached.

"Take it easy, Cas. Don't break anything, alright?"

The Alpha's ears, which had been laid back, pricked upward at Dean's voice. His advance didn't slow, though. Still on all fours he padded quietly across the forest floor, circling around to Dean's left. The Omega turned, following the approach, but otherwise didn't move. A part of him still believed Castiel wouldn't hurt him, but...there were a lot of stories, too. Of human Omegas who'd been on the receiving end of their mate's instincts during a Moon Fever. More than one ended up in the ER, be it for deep cuts, heavy bruises, broken bones, or some combination of the three. Some had been taken so harshly they'd required stitches. It was only one in ten, and never more than once for the same Omega, but the stories weren't made less true because of it. There might have been more hype around it, but every single one of them had been brought to the ER by an emotionally shattered Alpha. Werewolves took mates even more seriously than humans, and only ever took one. To lose one and be the reason for it would rip them apart, to even raise their hand to one was a crime to their kind.

Castiel hadn't hidden these things from him, and Dean had still mated him, still loved him. It was why he was out here now, prepared for the worst. He had dragged his feet, had been the reason they'd stayed out for an extra day before retreating to their cabin for Moon Fever. This was his fault, his price to pay.

"Cas? You in there?"

One ear flicked, but otherwise there was no response. Then Dean made his mistake, he took a step backwards. Instantly Castiel was airborne, pouncing on the Omega. Dean went down hard, the air forced from his lungs before he could do more than register the movement. One thumbed paw braced on his chest, keeping him down as a cold nose was jammed in his neck, making him grimace.

"Geez, Cas, take it easy would you?"

A growl was still thrumming in Castiel's throat, not wavering as he gave the Omega a good sniff over. Dean clamped his mouth shut, not resisting, letting the Alpha do what he wanted. After a few minutes the Alpha gave a satisfied snort, pulling his head back. He took his weight off Dean's chest, but it was just so he could flip the Omega onto his stomach. As soon as it was done the weight returned, pressing his shoulders to the ground. Why Dean wasn't sure, he still wasn't putting up a fight, but then werewolves tended to be paranoid, especially with their prey. That's what he was now, prey, and the Omega knew it. Only he wouldn't be devoured in the literal since, that much Dean was sure about.

His theory was confirmed when claws hooked under his belt and waistband, dragging downward. Denim and underwear alike shredded like rice paper. Dean gasped, going ridged as the chilled air hit bare skin. A low growl rumbled in his ear, the paw between his shoulder blades bearing down. Dean squeezed his eyes shut, breath coming in sharp gasps as he forced himself to relax. Knowing this would likely happen didn't make it any easier to face when he realized the Alpha was actually doing it.

They'd done this before, with Castiel in full wolf mode. Standing upright he was eight feet tall, at least, and that size increase was proportional everywhere. Then again, when they'd done this previously they hadn't rushed and Castiel had spent plenty of time on foreplay, not taking him until the Omega was literally dripping slick.

At this exact moment Dean's mouth was as dry as cotton, due to the recent adrenaline rush and fear. If he wasn't producing saliva there was no way in hell he was producing slick. Still Dean said nothing, biting his lip as clawed fingers hooked under his hips, lifting him to his knees.

"Cas?" he asked quietly, a pleading note in his voice.

The only answer he got was a louder growl. He opened his mouth to try again, a last ditch effort, but all that came out was a sharp gasp. The Alpha had dipped down, licking at the light scratches on his arms and legs. Blood had only been drawn in a few places, and they were from the wounds made by his mad run through the forest, not the light trails from Castiel's claws. Dean shivered at the sensation, opting to keep quiet, trying to use the opportunity to relax. It was harder than he'd hoped it would be, despite the hot tongue lapping at his wounds. He was never sure why, but he'd always liked the sensation, not that he ever told anyone.

Dean's eyes drifted closed, and no sooner had he talked himself into letting the tension out of key muscles then the licking paused. He had just enough time to notice the fact before he was clinching his jaw, biting back a cry as something hard and wet pushed its way into him. A strained gasp tore through his throat, the Alpha's cock burning hot against his sensitive flash, coated with pre cum and unrelenting as it bore into him. He might not be turned on but the werewolf was, which helped things a little. It wasn't much, but the pre cum did ease things slightly. At least he wasn't going in dry. Unfortunately this didn't mean the process was painless.

Dean jerked his arm over, biting down hard on his canvas jacket to smother a scream. His breathing was ragged, coming short and fast as his vision blurred, shoulders hunched and ridged under a restraining paw. Despite all this, it never occurred to him to struggle, to yell at Castiel to stop, to get off. All the Omega could think about was gritting his teeth and bearing it, trying to focus on something else to make that task easier. He was still convinced it was his own fault, that he'd brought this on himself.

The Alpha didn't stop. Dean did notice a slight easing eventually, though whether it was due to slick or blood he had no idea. At this point he wasn't sure he wanted to know. He kept his mouth shut, ridding it out as the werewolf fucked him into the forest floor. Once there was something acting as lube it wasn't actually that bad, in fact if he hadn't been unsure whether Castiel would pull out pre-knot he would have enjoyed it.

Damp green eyes flickered open when he felt Castiel's pace start to go erratic. He'd known it was a vain hope, but he still clung to it. The drive behind this whole mess was that other Alphas had gotten too close, one had even smacked his ass before Dean had bashed his face into a table. The werewolf was reasserting his claim as much as he was his dominance. A knot was a part of that, which worried Dean. Birth control wasn't 100% effective on any given day, but in this from it became even less so.

"Cas? Could-could you pull out? Cas, you in there? Okay, bad question. Uh- ah!"

Castiel did not pull out. Until then Dean had been completely convinced his human knot was all he could take. The werewolf proved him wrong. The Omega gasped, fingers clawing the earth as he felt the base of his mate's cock begin to swell. Castiel just managed to push it back inside the ring of muscle before it grew too large, drawing a strangled cry from the Omega. He'd never been so full in his life. Just when Dean was convinced he was going to be ripped apart, the knot stopped growing. In that same second, hot cum spilled into him. The Omega was frozen, taking in gasping breaths, trying very hard to keep his muscles relaxed. He wasn't sure what concerned him more, that he felt like a twitch would open a very large tear in a very bad place, or that he was hard. Very hard, considering the circumstances. At least that meant he'd managed to produce slick, hence the easing of pain.

"Don't move, please don't move," he whispered, voice more shaky than he was willing to admit.

Dean's eyes widened a little when a soft whine reached his ears, a cold nose nuzzling his throat. Clawed fingers stroked his cheeks, and the Omega made a face when they came away wet. Castiel looked at his fingers, then whimpered softly.

"Take it easy, don't freak or anything."

The next twenty minutes as they waited for the knot to deflate was spent with Dean trying to keep the Alpha from moving too much. The werewolf had settled down enough to notice his mate's distress and it was clearly concerning him. The return to normal behavior was reassuring, or it would be if it didn't make him wiggle so much.

When the knot finally did deflate, and the Alpha pulled out, Dean slumped to the ground in relief. The sensation of still warm cum dripping from his hole wasn't overly pleasant, but at least it was over. Not that he got much time to appreciate it. As soon as he slumped down Castiel was gathering him up, cradling the human against his chest as he sat hunched on the ground. Still whimpering low in his throat, the Alpha licked his face clear of tears, claws gently stroking through his hair, his entire body rocking them back and forth.

"Cas, it's okay, relax would you? I'm fine. It was my fault anyway."

His last statement earned a soft growl from the Alpha. Castiel pulled away, giving his mate a dirty look. He reached up, using a thumb to stroke his cheek, resting their foreheads together.

"It's my fault we were out when the Moon Fever hit," the human mumbled.

His comment earned him another low growl, followed by a smack to his ass. Dean barely managed to restrain a yelp, making a face. He was sore, but it would be gone in an hour or so. It didn't help that he still had cum dripping down his legs.

"You're going to have something to say when you're human again, ain't ya?"

Castiel nodded once, then reached out to snag the Omega's shredded jeans. His phone and wallet and keys were still in his pockets. After depositing the shredded denim in his lap, the werewolf gathered Dean up in his arms and rose to his feet.

"Damn it Cas. I can walk, you know."

The snort of disbelief was answer enough. Dean made a face, but knew better than to struggle. He'd only made the mistake of fighting Castiel post-coitus once before. The Alpha had put him over his knee for an honest to gods spanking. One that, to this day, he refused to admit had gotten him hard beyond belief.

Dean closed his eyes, tangling a hand in the werewolf's fur, resting his cheek against his chest. He could hear Castiel's heartbeat. It was oddly soothing.

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