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Dean’s half-brother squirmed underneath him, naked and leaking, as Dean's hand gripped Samandriel’s nape while his other guided his aching cock to the wet pussy waiting to be fucked full. His Rut was starting to burn through him, need and arousal impossible to ignore, as Samandriel whined when Dean’s knees spread the young Omega’s wider. He’d dreamed about fucking inside the whimpering Omega under him, dreamed about it until it had been almost impossible to control himself around Samandriel. He’d fucked several Omegas, pounding into them until his knot stuffed them full, but none of them had come close to being the temptation that Dean had found with his half-brother. There was just something sinful about it, about slipping his cock inside and fucking until Samandriel was gaping with his pretty pussy soaked with Dean’s come.
It was, after all, considered an Alpha’s right to enjoy an Omega’s holes as they pleased. Omegas often serviced their Alpha parents when they first presented and Dean knew that Samandriel had already been fucked and knotted repeatedly by their father whenever John’s claimed Omega wasn’t available. It would be nothing for a half-sibling to get the same kind of use out of an Omega sibling—Omegas were, after all, creatures built for pleasure and breeding. Truthfully, Dean had also thought about fucking his father’s Omega and seeing what his father enjoyed so much about the pretty Omega.
He could still remember when his father had claimed a new Omega, the soft scent filling their house once more, as the low simmering anger his father had carried after Mary’s death seemed to slowly disappear and the number of Omegas coming into their home for his father’s enjoyment shrunk with an Omega always available for knotting. The young Omega, Castiel, who had only been a few months off his official presentation, had taken over most of their care and slipped into the role of ‘mother’ even as his belly had swelled with the first child Dean’s father had bred into him—another boy, Samandriel.
Castiel had given Dean three more siblings though he was surprised it wasn’t more considering the amount of time his father spent buried balls deep in Castiel. There wasn’t a day that went by that Dean couldn’t hear his father fucking and knotting the Omega, the bang of a headboard and the sounds of an Omega whining common place in the Winchester house.
Then Samandriel, the second Omega sibling in the family, had officially presented as an Omega and Dean had found himself staring at his half-sibling more and more. His eyes would fix on the round, plump swell of Samadriel’s ass, the way his half-brother sucked on the end of his pen as he worked. He had imagined what it would be like, stripping his little brother and thrusting inside as he lost himself to the pleasurable sensation of fucking. The scent of a newly presented Omega, soft and sweet, had him spending most of his time hard and aching with the need to fuck. It certainly hadn't helped when Dean had watched their father bending the whimpering, newly presented Omega over the edge of the couch before sheathing his cock inside Samandriel’s once virgin cunt and fucking the wailing Omega until Samandriel had been gaping obscenely from being split open on a massive Alpha cock.
Now, as the wide end of his cock pushed against Samandriel’s opening, it was his turn to bury himself inside Samandriel and it was taking everything not to slam inside in one thrust and fuck his little brother into the mattress until he was hanging off Dean’s knot like a good Omega. He had missed out on Sam when his first Omega sibling had officially presented, their Alpha father liberally fucking and knotting Sam until his brother had been sold to an older Alpha across country, Lucifer something, but he had not missed out on Samandriel and his need to fuck Samandriel was overwhelming his Alpha instincts. Two presented Omegas in the house at once was nearly impossible for his instincts to ignore.
He kept his grip on Samandriel’s nape, his brother limp and whining underneath him like a good Omega bitch, as Dean pushed in and his eyes rolled in pleasure. The grip he had on his control was tentative as he thrust inside, fucking in inch by inch, until he was buried balls deep inside Samandriel and the sight of the Omega’s pussy spread wide around his cock had his arousal surging inside of him. Dean’s control snapped at the sight as his grip tightened and he started thrusting into Samandriel, balls slapping lewdly against the Omega underneath him, as the bed knocked against the wall.
It felt amazing, hot and wet while it rhythmically clenched around him, as his cock pounded in and out of Samandriel’s soaked pussy. He lost himself to the sensation of rhythmic thrusting, cheeks flushed and mouth dropped open as he moaned his enjoyment, while whines and whimpers escaped the squirming Omega under him. Dean’s fingers dug in when his knot started to catch on Samandriel’s entrance, popping in and out, as the Omega panted beneath him. His instincts urged him to surge forward, to dig his teeth into the bonding gland on the back of Samandriel’s neck, as he slammed deep and knotted Samandriel’s pussy for the first time. He bit the pillow next to his half-brother instead of giving into his instincts, avoiding the Omega’s neck, as his hips jerked forward and the Omega’s inner walls eagerly milked his knot.
It was pleasure and satisfaction beyond anything he had imagined, it felt right and perfect and deliciously enjoyable, as he idly rocked up against Samandriel while his release was pumped into the Omega caught on his knot. Dean was sure he could spend a week pounding Samandriel’s soaked pussy without getting tired of it—the duration of his Rut would, likely, have to do. If he was lucky, he could enjoy Samandriel outside of his Rut but it would depend on his own father's reaction to Dean not asking permission before giving in to his own needs.
“Dean have you seen Sam—”
Castiel’s voice cut off and Dean shifted, blinking through a haze of near-constant pleasure, as he took in the horrified look on his father’s Omega’s face as the Omega started to protest. It was almost amusing that an Omega would be horrified at half-siblings fucking considering Dean was sure that Castiel’s own Alpha parent had likely fucked and knotted him before Castiel had been sold to John Winchester. He knew Castiel had tried to raise them like Beta siblings but they were not Betas and Dean was thoroughly enjoying that fact. He couldn't imagine not being an Alpha and enjoying the satisfaction of knotting an Omega.
As Dean rocked up against Samandriel he caught sight of movement in the hallway and watched as his father stepped up behind Castiel, gazing at them, as he took in the unbroken bonding gland on Samandriel’s neck with approval. “Dean started his Rut, Omega. He’s found a perfectly suitable Omega to use for the duration.” He watched his father tugging Castiel back who was still staring at them horrified, no doubt, to realize Dean didn't view his little brother purely as a sibling. Dean found it impossible to care, he was far too lost to the pleasure of a successful knotting as his father continued to address his Omega. “Make sure you call Samandriel out, he’ll be busy with Dean's Rut.”
Dean turned away from the conversation taking place in the doorway, rocking up against Samandriel once more and groaning as his cock emptied another load into Samandriel. Whatever they were saying wasn’t important, the only thing important in that moment was the glorious feeling of an Omega cunt milking his knot and the choked little sounds Samandriel was releasing when Dean ground his hips forward as he came over and over. Dean no longer had to imagine what it felt like to be inside Samandriel, no longer had to imagine himself in his father’s place whenever the older Alpha used Samandriel in place of Castiel—he knew exactly how it felt and Dean wanted more.
He didn’t pay any attention to anything other than the warm, wet hole wrapped around him until his father returned. “Don’t growl at me, Dean.” He didn’t realize he’d been making a sound until his father’s snapped command had him blinking as John Winchester locked a collar around Samandriel’s neck to prevent biting and locked an Alpha knot gag into Samandriel’s mouth. The sight of Samandriel’s mouth stretched wide around a fake knot had Dean groaning with the need to fuck his half-brother’s face next. “I don’t need my Omega startling every time a sound escapes his ‘baby’s’ mouth.” John rolled his eyes and Dean rocked up against Samandriel with another moan not caring that his father was standing next to them. “It’s good to see this one is good for something more than occasionally warming my cock when my Omega isn’t available. I might wait to find him an Alpha if he’s being used for your Ruts.”
Dean didn't say a word, not wanting to jeopardize the possibility his father had just presented. Instead his fingers dug into Samandriel, holding the Omega in place.
Then his father was gone and Dean’s knot slipped free, his release leaking out of a fucked open hole and dripping onto the bed. It was perfect, spending his entire Rut fucking and knotting Samandriel. The bulge hanging underneath Samandriel from countless loads of come had Dean’s instincts practically purring in satisfaction. He didn’t stop, alternating between fucking Samandriel’s soaked pussy and, after using slick and come to ease the way, Samandriel's tight asshole, until both were constantly gaping and leaking come from thorough use.
It was the most satisfying and pleasurable Rut he'd experienced since officially presenting.
On Thursday, knot caught in Samandriel’s ass, Dean’s Rut finally ended as he idly rocked up against Samandriel and relished the pleasure of a tight hole locked down on his knot. There really was nothing quite like being balls deep inside his little half-brother, body and instincts thrumming with the need to fuck, as Samandriel softly whimpered into his gag that had only been removed when Castiel had come in to care for Samandriel between knottings. He rubbed his thumb against the puffy, swollen rim of Samandriel’s ass while another load emptied into his brother’s thoroughly used hole. Samandriel’s eyes were glazed, pink mouth stuffed with his gag, as muffled sounds escaped while Dean’s pleasure surged inside of him—he’d wasted far too much time waiting for his Rut when he could have been enjoying this sooner.