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The bass from the party thrummed through the walls, a steady, pulsating beat that matched the simmering heat in James Potter’s chest. The Gryffindor common room was crowded, but James only had eyes for one person—Regulus Black, his boyfriend, sprawled lazily on the couch, legs stretched out, leaning far too comfortably against Barty Crouch Jr.
Regulus’ head rested on Barty’s shoulder, his lips curled in that familiar, lazy smirk as he talked to him, casually tossing back some drink. Barty laughed at something Regulus said, and the sound grated on James’s nerves like nails on a chalkboard.
James knew—knew—that Barty was with Evan Rosier. He knew there was nothing between him and Regulus beyond years of friendship, but that knowledge did little to quell the ugly flare of jealousy roiling in James’ stomach. It wasn’t just Barty. It was everything. Every time someone looked at Regulus too long, every lingering touch from a friend or a stranger alike—it set James on edge, his possessive instincts kicking into overdrive.
Regulus said he understood, but did he? Did he really? It felt like every time James turned around, Regulus was with Barty, touching him, leaning into him, looking far too at ease. And tonight, watching them from the corner of the room as Sirius cracked jokes with Remus nearby, James could feel his control slipping.
Barty said something that made Regulus tilt his head back and laugh, and that was it. Something inside James snapped.
“Prongs, you alright?” Sirius asked, cutting into James’ line of sight as if sensing the change in his mood.
“I’m fine,” James ground out, his eyes still locked on Regulus, whose fingers now ghosted over Barty’s forearm in a gesture that should have been innocent. But it wasn’t—not to James.
“Doesn’t look like it,” Sirius muttered, following his gaze. “You know Reg and Barty over there are just messing around, yeah?”
“Yeah, yeah, I know,” James said, though his voice lacked any conviction.
But knowing and feeling were two very different things, and right now, all James felt was the primal urge to stake his claim. He took a deep breath, forcing himself to stay calm, but his body was already moving, his feet carrying him across the room before he could think better of it.
Regulus glanced up as James approached, raising an eyebrow at the storm brewing behind his boyfriend’s eyes.
“James,” he drawled lazily, as if he hadn’t just been curled against another man, as if he couldn’t feel the tension radiating from him. “Finally decided to join us?”
James didn’t respond. He barely looked at Barty, who was smirking in that smug, knowing way of his. Instead, he grabbed Regulus’ wrist, pulling him up off the couch in one swift, possessive movement.
“We need to talk,” James said, his voice rough, leaving no room for argument.
Regulus blinked, surprised but not protesting as he let himself be pulled away from Barty, who watched with thinly veiled amusement.
James didn’t stop until they were upstairs, the muffled sound of the party below growing distant as they entered the privacy of his room. The door clicked shut behind them, and in the silence, the tension between them simmered, thick and palpable.
“What’s gotten into you?” Regulus asked, crossing his arms as he leaned back against the wall, watching James with sharp eyes.
“What’s gotten into me?” James repeated, voice low as he took a step forward. “Maybe it’s the fact that you’ve been draped all over Barty all night.”
Regulus sighed, running a hand through his hair. “You’re overreacting. Barty and I are friends, James. Friends. You know that.”
“Friends,” James scoffed, his jaw clenching. “I’m tired of hearing about you and Barty. Tired of watching you touch him like that.”
Regulus’ lips quirked into a half-smile, but there was an edge to it. “Jealous, are we?”
James didn’t answer. Instead, he closed the distance between them in two swift strides, crowding Regulus against the wall, his hand coming up to grip the back of his neck. The heat between them flared instantly, the air thick with the unspoken tension that had been building all night.
“You think it’s funny, don’t you?” James growled, his lips brushing against Regulus’ ear, voice dark. “Watching me get worked up while you hang all over him. Do you like teasing me, Reg?”
Regulus’ breath hitched, his smirk faltering as he looked up at James, his pupils blown wide with a mix of surprise and desire. “Maybe,” he whispered, but the bravado in his voice was thinning, crumbling under the intensity of James’ gaze.
James’ grip tightened, his thumb brushing over the pulse at Regulus’ throat, feeling the rapid thrum of his heartbeat. “I don’t think you get it,” James murmured, his lips trailing down to the side of Regulus’ neck, where he bit down, hard enough to make Regulus gasp. “You’re mine.”
Regulus’ fingers curled into the front of James’ shirt, tugging him closer, his breath coming faster now. “Prove it, then.”
And that was all the permission James needed.
James’ eyes darkened at Regulus’ challenge, and in a swift movement, he pressed their bodies flush together, pinning Regulus against the wall. His hand slid down Regulus’ chest, fingers brushing the hem of his shirt before slipping underneath, his touch rough, possessive.
“You want me to prove it?” James growled, his mouth ghosting over Regulus’ collarbone, the warmth of his breath making Regulus shudder. “By the time I’m done with you, no one’s going to doubt who you belong to.”
Regulus opened his mouth to retort, but his words caught in his throat as James’s lips found his neck again, sucking hard enough to leave a bruise. Regulus groaned, his body reacting instinctively, pressing into James with a need that was growing by the second.
James didn’t stop. He bit down again, leaving another mark, then another, his teeth and lips working over Regulus’ skin, staking his claim with hickeys and bites that would linger for days. Every gasp and whimper that fell from Regulus’ lips only fueled him, the jealousy in his chest twisting into something far darker, far more consuming.
“You think Barty can make you feel like this?” James rasped against Regulus’ throat, his voice rough with possessive hunger. “Think he could even come close to touching you the way I do?”
Regulus’ breath hitched, and he shook his head, unable to speak, too lost in the sensation of James’ lips and teeth on his skin, the way his hands gripped his hips so tightly it almost hurt.
“Say it,” James demanded, his voice low, commanding.
“No,” Regulus gasped, his fingers curling into James’ hair, tugging as his body arched into him. “No one but you.”
“That’s right,” James murmured, his lips brushing against the shell of Regulus’ ear. “You’re mine, Regulus. All mine.”
His hands moved down, gripping Regulus’ hips harder before sliding one knee between his legs, pressing up against the growing hardness there. Regulus groaned, his head falling back against the wall, his body trembling with need.
James’ smirk widened, the heat building between them to an almost unbearable point. He ground his hips against Regulus’, their bodies moving together in a slow, agonizing rhythm that left both of them panting. Every slow drag of their bodies, every brush of fabric against aching flesh, drew out the tension, the frustration, until Regulus was all but whimpering beneath him.
“You like this, don’t you?” James whispered, his lips brushing against Regulus’ ear, his voice dripping with dark satisfaction. “Like being teased, being made to wait.”
Regulus’ hands fisted in James’ shirt, his breath coming in ragged gasps. “James—” he began, his voice breaking as he tried to grind harder against him.
But James wasn’t about to let him have it that easily.
With a cruel smirk, James pulled back just enough to halt Regulus’ movements, his grip tightening on his hips to keep him still. Regulus let out a frustrated sound, his body desperate for more friction, more contact.
“Ah, ah, not so fast,” James teased, his hand sliding under Regulus’ shirt again, fingers brushing over his stomach, up to his chest. He pinched one of Regulus’ nipples between his fingers, hard, just to hear him gasp again. “You don’t get to finish until I say so.”
Regulus’ eyes fluttered shut, a mixture of frustration and arousal twisting through him. “You’re such an asshole,” he muttered, though his voice was shaky, betraying just how much he wanted this.
“Maybe,” James conceded, leaning in to brush his lips against Regulus’, teasingly soft. “But you love it.”
Regulus groaned, and his lips parted, chasing James’, but James pulled back again, watching as Regulus’ frustration mounted. He could feel the tension in Regulus’ body, the way he was straining against him, desperate for more, for release.
And James wasn’t going to give it to him. Not yet.
With deliberate slowness, James moved his hand down to the bulge in Regulus’ jeans, rubbing his palm against it with just enough pressure to make Regulus gasp. “Is this what you want?” James murmured, his voice rough as he cupped Regulus through his jeans, feeling the heat and hardness beneath his hand.
“Fuck, James,” Regulus gasped, his body jerking into the touch, his hands clinging to James as if he were the only thing keeping him grounded.
James smirked, dragging his palm over Regulus’ erection again, slow and deliberate, before pulling back entirely, watching the frustration and desperation flicker across Regulus’ face.
“You don’t get to cum until I’ve marked every inch of you,” James growled, his voice dark with intent. “Until I’ve made it so fucking clear who you belong to that no one else will dare touch you.”
Regulus’ breath hitched, and he bit his lip, his eyes dark with desire. “Then do it,” he whispered, his voice barely audible, a plea laced beneath the defiance.
James didn’t need any more encouragement.
He surged forward, crashing his lips against Regulus’ in a rough, hungry kiss that left both of them breathless. His hands moved frantically, tugging at Regulus’ shirt, pulling it off and discarding it to the side. He pushed Regulus back against the bed, not bothering with finesse as they collapsed onto it, their bodies tangling together in a desperate mess of lips and hands, of teeth and skin.
James’ mouth trailed down Regulus’ chest, biting, sucking, leaving marks everywhere he could, claiming him in every way he knew how. He could feel the tremors running through Regulus’ body, the way he was trembling with need, and it only spurred him on, his own desire building with every whimper and gasp that escaped Regulus’ lips.
Finally, when Regulus was covered in hickeys and bite marks, when his body was shaking with the need for release, James relented. His hand moved down between them, undoing the button of Regulus’ jeans and slipping inside, wrapping around him with just enough pressure to make Regulus cry out.
“Finish for me, Reg,” James whispered, his voice soft but still commanding. “Now.”
Regulus’ body jerked, and with a choked gasp, he came hard, his whole body trembling as James stroked him through it, his name falling from Regulus’ lips like a broken prayer.
For a moment, everything was still, the only sound in the room their ragged breathing.
Then, slowly, James pulled back, his hands softening their grip as he moved beside Regulus on the bed. He pressed a gentle kiss to Regulus’ shoulder, his touch far more tender now as the intensity of the moment ebbed away.
Regulus turned his head slightly, his breathing still heavy, but there was a softness in his gaze as he looked at James.
“I didn’t mean to make you jealous,” Regulus murmured, his voice rough, but sincere.
James smiled faintly, brushing a strand of hair out of Regulus’ face. “I know. I just— I hate seeing anyone else touch you.”
Regulus gave a soft, tired laugh. “You don’t have to worry about that. You’re the only one I want.”
James’ heart clenched at that, and he leaned in, pressing a soft, lingering kiss to Regulus’ lips. It wasn’t rough, or possessive—it was gentle, filled with the quiet reassurance that lingered between them.
They stayed like that for a while, wrapped up in each other, the possessive heat of earlier fading into something far softer, far more intimate.
“You okay?” James asked quietly, running a hand soothingly down Regulus’ arm.
Regulus nodded, a small smile tugging at his lips. “Yeah. I’m good.”
James pulled him closer, pressing another kiss to his forehead. “Good.”
They lay there in comfortable silence, their breathing slowly evening out, the heat of the earlier encounter replaced by a warm, lingering closeness. And for the first time that night, James felt the tension in his chest ease, the jealousy that had been gnawing at him dissipating as he held Regulus close, his hand resting lightly on the marks he’d left behind.
Regulus was his. And that was all that mattered.