Dark Descent: The Mark's Hunger

<h2>Chapter 1: Unspoken Heat</h2><p>The bunker was a tomb of secrets, its air thick with the weight of unspoken desires as Dean paced the library, his boots scuffing the worn floor with restless energy. Castiel lingered in the shadowed corner, his trench coat discarded, the Mark of Cain pulsing on his forearm like a living wound. It had twisted him, the angel Dean once knew now a storm of feral intensity, his eyes flickering with blackened edges, voice rough with a growl that sent shivers down Dean’s spine.</p><p>'Cas, we can’t keep doing this,' Dean snapped, stopping to face him, hands on his hips like he was laying down the law. 'The Mark’s tearing you apart. You’re not yourself, man. We’ve gotta—'</p><p>Castiel moved like lightning, his hand cracking across Dean’s cheek with a sharp slap that echoed off the stone walls. Dean’s head snapped to the side, pain flaring hot and instant, a trickle of blood on his lip. He stumbled back, jaw tight, but straightened fast, wiping his mouth with a smirk. 'That’s your opener? Come on, angel, hit me with something better.'</p><p>'Don’t play the hero, Dean,' Castiel snarled, stepping closer, his grace crackling like a brewing tempest. 'I’ve waited too damn long. Watched you dance with death, with every cheap fling, but never with me.' His fingers clamped onto Dean’s collar, yanking him forward until their breaths mingled, hot and uneven.</p><p>Dean shoved at his chest, meeting unyielding steel. 'Back off, Cas. This ain’t you talking.'</p><p>Another slap, sharper, sent Dean reeling into the table, books crashing to the floor as he caught himself, knuckles white on the edge. 'Keep talking, Winchester,' Castiel mocked, a dark laugh rumbling as he grabbed Dean by the throat, slamming him back against the wood. 'Always acting unbreakable. But I see through you—the hunger you’ve buried under all that bullshit bravado.'</p><p>Dean’s hands fisted in Castiel’s shirt, pushing uselessly as the angel’s knees forced his legs apart, pinning him down. 'You think you know me?' Dean shot back, voice rough but steady, even as his heart thundered. 'Takes more than a few cheap shots to break me.'</p><p>'Oh, I’ll break you,' Castiel growled, ripping Dean’s flannel open with a savage tug, buttons scattering. Cool air hit skin, followed by the heat of Castiel’s mouth, teeth grazing a nipple, biting just hard enough to pull a sharp hiss from Dean. He bucked, but Castiel’s weight was a cage, one hand pinning Dean’s wrists above his head with brutal strength.</p><p>'Cas, cut the crap—' Dean’s words choked off as Castiel’s free hand shoved into his jeans, rough fingers wrapping around his cock, stroking hard and fast. No finesse, just raw demand. Dean’s body betrayed him, growing hard despite the edge of fear slicing through him. 'You’re playing dirty now,' he gritted out, trying to mask the tremor in his voice.</p><p>'No more games,' Castiel hissed, flipping Dean over with a rough jerk, face down on the table, jeans yanked to his thighs, ass bared. Dean gripped the edge, muscles tensing, forcing a cocky edge to his tone. 'Gonna have to do better than that to make me sweat.'</p><p>Castiel’s laugh was low, dangerous, as he spat into his hand, slicking himself up. Dean felt the thick, throbbing head of Castiel’s cock press against him, and braced for the storm. The air was heavy, charged with the promise of something explosive, their bodies poised on the edge of a collision neither could stop. Castiel leaned in, breath hot against Dean’s ear. 'Let’s see how long that smart mouth lasts when I’m buried in you, making you pant and beg for more.'</p>