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The Mountain Man's Colossus

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When rugged wilderness guide Kade rescues stranded hiker Eli during a brutal storm, their instant tension crackles hotter than the lightning splitting the sky. But Eli harbors a bizarre secret—he's part of a classified experiment that triggers extreme muscle growth and height surges during adrenaline spikes. As Kade leads them through the treacherous mountain pass, Eli's body keeps transforming at the worst moments, his clothes ripping at the seams while Kade's fascination burns wilder than their campfire. Stranded in an abandoned ranger station, their survival games turn carnal as Eli's explosive physical changes awaken Kade's possessive alpha instincts. But extraction teams are hunting Eli, and Kade must choose between turning him in or helping harness his dangerous new abilities—preferably while riding those colossal thighs.

Chapter 2: Lightning Strikes & Ripped Seams (Part 2)

The world had shrunk to the slick, shifting rock under their feet and the next blinding flash of lightning. Kade hauled Eli forward, his mind a white-noise static of denial. What he’d seen wasn’t possible. The body didn’t work that way. It didn’t just… reinvent itself in the space of thirty seconds.

Eli stumbled beside him, a hulking silhouette against the storm’s fury. He was heavier now, his movements clumsy and uncoordinated in this new, larger form. Every gasp he took was a ragged, whistling thing.

“There!” Kade shouted, spotting a darker patch in the cliff face—a shallow recess, barely more than a gouge in the rock, but it was shelter from the lashing rain. He shoved Eli toward it. “Move!”

Another step, and Eli’s leg buckled. Not from weakness. Kade saw it this time, a sickening, visible jolt that traveled through the man’s frame. Eli cried out, a sound that was part pain, part sheer terror, as his body shuddered and elongated. His spine seemed to uncurl, adding inches in a single, grotesque pulse. He staggered, his new height throwing off his center of gravity, and would have pitched over the edge if Kade hadn’t slammed him back against the rock face.

Kade pinned him there, one arm braced across Eli’s now-massive chest, his own body pressed close to keep them both from falling. The stone was cold and rough against his cheek. Eli’s body was a furnace, heat radiating through the torn, wet fabric. He could feel the hard, defined muscle of Eli’s torso, still quivering with the aftershocks of the change.

And he could feel something else.

A firm, insistent pressure against his hip. Growing. Hardening.

Kade froze. His brain, already struggling to categorize the muscle growth and height increase, short-circuited completely. This was a different kind of transformation, visceral and unmistakable. It wasn't just his size. The program, the experiment, whatever it was—it had rewired everything.

Eli’s eyes, wide and desperate, found his. He knew. The shame in that look was a physical force.

“I can’t… I can’t stop it,” Eli choked out, his voice a deeper, rougher version of the one from before. He squeezed his eyes shut, as if he could wish them both away from this moment.

A low rumble started deep within the mountain, different from the thunder. It was a grinding, visceral vibration that traveled up through the soles of their boots. The rock shelf they were standing on shuddered. Pebbles and then fist-sized stones clattered down from above, pinging off their shoulders and helmets.

The cave. It wasn't a sanctuary. It was a death trap, its overhang cracking under the mountain’s convulsions.

“Shit,” Kade breathed, the single word laden with a fresh wave of dread. The immediate, collapsing world overrode the impossible horror in his arms. He grabbed a handful of Eli’s shredded shirt. “We have to go. Now!”

He didn’t wait for a response. He just pulled, yanking the bigger man away from the relative safety of the crumbling rock and back into the full, violent embrace of the storm. Eli stumbled after him, a giant born of lightning and fear, his body a ticking time bomb and his secret now horrifyingly, intimately known.

The world dissolved into a sliding chaos of mud and screaming wind. Kade drove them forward, his own muscles burning with a fatigue that felt mundane next to the unnatural force stumbling behind him. Every few steps, Eli’s larger, unfamiliar frame would falter, his new weight a liability on the unstable ground.

“Just keep moving!” Kade yelled, the words ripped from his lips. He didn’t look back, couldn’t bear to see what was happening to the man whose arm was slung over his shoulder.

A deep, grating rumble answered from the mountain itself. The path ahead seemed to shift, a whole section of earth and rock beginning to slide away into the misty void. “Left! Go left!” Eli’s voice, now a strained baritone, shouted near his ear. He pointed a thick, corded arm toward a denser patch of ancient, wind-twisted pines, their roots clawing deep into the more stable rock.

They lunged for the tree line, scrambling on all fours as the world fell away behind them. The sound of the landslide was a swallowing, final roar. They collapsed together between the gnarled roots of a massive pine, its trunk wide enough to shield them from the worst of the wind. For a long moment, there was only the sound of their ragged breathing and the relentless drumming of rain on the canopy above.

Kade finally risked a look at his companion. Eli was curled against the tree’s base, his head in his hands. The explosive growth seemed to have receded, not entirely, but enough that he no longer looked like a caricature of a bodybuilder. He was just a very large, utterly broken man shivering in the cold.

“What the hell was that?” Kade asked, his voice low and stripped of anything but raw curiosity.

Eli didn’t look up. “The mountain?”

“You know what I mean.” Kade’s gaze dropped pointedly to Eli’s torn clothes, to the still-impressive breadth of his shoulders. “The… other thing.”

A full-body shudder wracked Eli, but it was one of exhaustion, not transformation. “It’s a long story.” He finally lifted his head, his eyes red-rimmed. “And I swear, I’m not a threat to you.”

“Could’ve fooled me,” Kade muttered, leaning his head back against the rough bark. The adrenaline was leaching away, leaving a hollow, tired ache. “The growing thing was one issue. Then there was the, uh… enthusiastic follow-up.”

Eli’s face flushed a deep, mortified red. He pulled the remnants of his jacket tighter around himself. “It’s a systemic response. The adrenaline, the pituitary override… it doesn’t discriminate. It just… amplifies everything.” He looked away, into the sheeting rain. “I’m really sorry you had to experience that.”

They sat in silence for a while, the storm beginning to show its first signs of fatigue. The wind’s scream lowered to a weary moan, and the rain softened from a punishing fist to a steady, soaking drizzle. The thick mist began to thin, revealing the ghostly outlines of the surrounding peaks.

Kade watched the clouds slowly tear apart, revealing patches of a deep, bruised twilight sky. A single, sharp star pricked through the darkness. The storm was passing. They had made it.

He looked over at Eli, who was now staring at his own hands as if they belonged to a stranger. The immediate danger was over, but a new, more complicated one had just begun, sitting right beside him in the quiet, dripping forest.

The deep chill was finally seeping into Kade’s bones, a dull ache that cut through the fading adrenaline. He watched a shiver wrack Eli’s broader frame, the wet fabric of his ruined shirt clinging to skin that still seemed to hum with unnatural energy. “We’re going to get hypothermia if we stay in these clothes,” Kade said, his voice rough from the storm. He began unbuttoning his own soaked flannel, the stiff material resisting his cold-numbed fingers.

Eli just stared, his eyes dark pools of exhaustion and something else—a wary anticipation. “Yeah,” he muttered, his voice still deeper than it should be. He pulled at the tattered remains of his own shirt, the fabric tearing easily as he peeled it from his torso. The revealed skin was pale and covered in a fine sheen of rain or sweat, the musculature beneath still pronounced and defined, a testament to the violent change his body had endured.

Kade shrugged out of his flannel and then his thermal undershirt, dropping the heavy, wet garments onto the pine needles with a soft splat. His own skin prickled in the cool, damp air. His eyes were drawn to the solid width of Eli’s shoulders, the powerful cut of his chest, and lower, to the prominent bulge straining against the soaked denim of his jeans. The memory of that pressure against his hip flashed through his mind, hot and immediate.

“Fuck,” Kade breathed, the word leaving his lips in a cloud of mist. He wasn’t thinking about the mountain or the experiment anymore. He was only seeing the raw, physical fact of the man in front of him. He reached out, his hand landing on Eli’s chest, feeling the startling heat and the rapid, heavy beat of his heart beneath his palm.

Eli flinched at the contact, a sharp intake of breath hissing between his teeth. “Kade…” he started, a warning or a question, Kade couldn’t tell.

“Shut up,” Kade said, his voice low and gruff. He leaned in, closing the distance between them, and captured Eli’s mouth in a hard, demanding kiss. It wasn’t gentle. It was all teeth and desperate pressure, a release of the terror and the strangeness of the night. Eli froze for a heartbeat, then a broken sound escaped his throat and he was kissing back, his own hands coming up to fist in Kade’s hair, pulling him closer with a strength that was barely contained.

Kade’s hands slid down Eli’s torso, tracing the hard ridges of his abdomen, before fumbling with the button of his jeans. The metal was cold, the denim stiff with water. “Need these off,” he growled against Eli’s mouth, his own cock already hard and pressing against the confines of his wet pants. Eli just nodded, his breathing ragged, and helped shove the heavy fabric down his thick thighs, his erection springing free, thick and flushed and impossibly real.

They stumbled back against the broad trunk of the pine, its bark rough against Kade’s bare back. Eli was on him, all heat and hungry mouth, his larger body pinning Kade to the tree. Kade wrapped a leg around Eli’s hip, pulling him closer, grinding their cocks together in a slick, frantic friction. “You’re so fucking big,” Kade gasped, arching into the contact, the sheer size of Eli overwhelming his senses.

Eli’s mouth was on his neck, sucking a bruise into the skin, his hands gripping Kade’s ass, squeezing hard. “Is this… is this okay?” Eli mumbled into his skin, the words slurred with need, a last vestige of his former self clinging to propriety.

“God, yes,” Kade choked out, his own hand wrapping around both their lengths, his fist struggling to contain them. The slide was wet and hot, pre-come and rainwater making a filthy, perfect lubricant. He pumped his hand, setting a rough, hurried rhythm. “Fuck me, Eli. I need to feel you.”

Eli didn’t need to be told twice. He spun Kade around, pressing his chest against the rough bark. “Spit,” Eli commanded, his voice a raw scrape. Kade hawked and spat into his own palm, then reached back to slick Eli’s cock, the heat and weight of it a promise in his hand. Eli positioned himself, the broad head of his cock pressing against Kade’s entrance. There was no patience, no gentle preparation, just the burning, stretching pressure as Eli pushed inside with a single, relentless thrust.

Kade cried out, a sharp, guttural sound that was swallowed by the forest. The stretch was immense, a blinding white pain that quickly blurred into a deep, filling pleasure. “Jesus Christ,” he panted, his fingers clawing at the tree bark. Eli held still for a moment, buried to the hilt, his body trembling against Kade’s back. Then he began to move, setting a punishing pace that shook them both.

His thrusts were hard and deep, each one punching a grunt from Kade’s lungs. The sound of their bodies slapping together, wet and primal, mixed with their ragged breaths and the steady drip of water from the leaves. Eli’s hands gripped Kade’s hips, surely leaving bruises, holding him in place as he fucked into him with a kind of desperate, animalistic fury. “So tight,” Eli groaned, his face buried in Kade’s shoulder. “You feel so fucking good.”

Kade pushed back against him, meeting every thrust, his own cock leaking onto the moss below. The pain was gone, replaced by a building, coiling heat in his gut. “Harder,” he demanded, his voice broken. “Don’t you fucking hold back.”

A guttural snarl was his answer. Eli’s rhythm became erratic, his hips pistoning faster, his grip bruising. Kade could feel the moment Eli lost control completely, his body seizing, his thrusts becoming shallow, frantic jerks. “Kade… I’m gonna…” Eli’s warning was a hoarse shout.

“Do it,” Kade gasped, and that was all it took. Eli slammed into him one last time, his whole body stiffening as he came with a raw, broken cry, his release pumping hot and deep inside. The feeling of Eli pulsing within him, the sheer animal completion of it, sent Kade over the edge. His own orgasm ripped through him, his come streaking the tree’s roots as he shuddered and clenched around Eli’s still-throbbing cock.

For a long moment, they stayed like that, joined and breathing heavily, the only sound their harsh pants echoing in the quiet clearing. Eli slowly softened and slipped out, his hands gentling on Kade’s hips. Kade leaned his forehead against the rough bark, spent and utterly exposed, the cold air a shock on his sweat-sheened skin. The complicated thing between them was no longer a mystery; it was a physical memory etched into their very cells.

The complicated thing between them was no longer a mystery; it was a physical memory etched into their very cells. Kade leaned against the rough bark, his breath slowly returning to normal, the chill of the air beginning to bite at his exposed skin. Eli remained behind him, his broad chest still pressed against Kade’s back, his breathing a warm, damp rhythm on Kade’s neck.

“We should…” Kade began, his voice hoarse, but he didn’t move.

Eli’s hand, which had been resting on Kade’s hip, slid around to his stomach, pulling him closer. The touch was possessive, grounding. “Yeah,” Eli murmured, the word vibrating through Kade’s spine. His other hand came up, fingers tracing the fresh bruise on Kade’s shoulder where his mouth had been moments before. The casual intimacy of it was more shocking than the sex had been.

Kade turned within the circle of Eli’s arms to face him. In the dim light, Eli’s eyes were dark, unreadable pools, the panic from the mountain pass replaced by a weary, heavy-lidded intensity. Kade brought a hand up to Eli’s jaw, his thumb scraping over the stubble there. The gesture was meant to be assessing, a check-in, but it ignited something else entirely.

Eli’s gaze dropped to Kade’s mouth. He leaned in, his kiss this time slower, more deliberate, a deep, searching exploration that tasted of rain and sweat and salt. Kade met it with a low groan, his hands sliding up to tangle in Eli’s damp hair, pulling him closer. The exhaustion was still there, a lead weight in his limbs, but it was being swiftly overridden by a fresh, sharp surge of want.

Eli’s hands moved down Kade’s back, over the curve of his ass, gripping and kneading with that same terrifying, exhilarating strength. He broke the kiss, his breath hot against Kade’s ear. “I need to be inside you again,” he growled, the words not a request but a stark, hungry statement of fact. “Right now.”

“Then do it,” Kade challenged, his own cock already hardening again, pressing against Eli’s thigh. He pushed Eli back toward a thick bed of moss between the pine’s giant roots, following him down. Eli landed with a soft thud, his large frame sprawled against the green, his eyes locked on Kade with a feral focus.

Kade straddled his hips, looking down at the powerful body beneath him. He reached between his own legs, wrapping his hand around Eli’s cock, which was already thick and fully hard again. The sheer size of it, the memory of the stretch, sent a jolt of pure anticipation through him. He guided the head to his entrance, still slick and loose from their first frantic joining.

He sank down slowly, his eyes fluttering shut as he took every thick, aching inch. The feeling of being filled so completely was a drug. “Fuck,” he whispered, bracing his hands on Eli’s chest, feeling the solid muscle there.

Eli’s hands clamped onto his hips, his fingers digging in hard. “Move,” he commanded, his voice strained.

Kade began to ride him, setting a slow, deep rhythm that made them both gasp. Each upward stroke was a tease, each downward plunge a claiming. He opened his eyes and looked down at Eli, at the raw need etched on his face, and felt a dizzying sense of power. This colossal, broken thing was his to command, if only for these few minutes.

He leaned forward, changing the angle, and Eli’s head fell back with a choked-off moan. “Right there,” Eli gritted out, his hips bucking up to meet Kade’s thrusts. “Don’t stop.”

The pace quickened, becoming less controlled, more desperate. The sound of their bodies meeting was a wet, rhythmic slap in the quiet forest. Kade’s own cock was leaking, a steady drip onto Eli’s stomach. He was close, so close, the coil in his gut tightening to a breaking point.

“I’m gonna come,” Kade warned, his rhythm becoming erratic.

Eli’s eyes snapped open. They were wide, but not with pleasure. A familiar, terrifying panic flooded them. “Kade, get off,” he gasped, his body beginning to tremble beneath him. “It’s happening.”

But it was too late. Kade felt it the same instant Eli cried out—a deep, internal shudder that rippled through the man beneath him. Eli’s body arched, his back bowing off the mossy ground. The muscles under Kade’s hands began to writhe and swell, expanding with a sickening, rapid elasticity.

Eli’s chest broadened, pushing Kade’s hands wider apart. His shoulders thickened, the deltoids bulging into hard, defined orbs. The cock inside Kade, already massive, seemed to grow impossibly thicker, stretching him to a blinding, painful degree. A guttural, agonized roar tore from Eli’s throat as his height increased, his legs lengthening, his feet pushing against the tree roots.

Kade was thrown forward, his chest slamming against Eli’s now-barrel-wide torso. He was trapped, impaled on a piece of living, changing flesh. He could only cling to Eli’s shoulders, his own orgasm forgotten, replaced by a wave of nauseous awe and fear. He watched the tendons in Eli’s neck cord like ropes, heard the faint, sickening sound of stretching skin.

The convulsions subsided as suddenly as they began, leaving a shuddering, panting behemoth in their wake. Eli was enormous, a giant carved from marble and sinew, dwarfing the man still straddling him. The moss beneath them was flattened, the air thick with the scent of sex and something metallic, like ozone.

Eli’s eyes, now level with Kade’s despite Kade being on top of him, were filled with a bottomless shame. “I told you to get off,” he whispered, his new, deeper voice a resonant rumble that Kade felt in his own bones.

Kade, still speared on Eli’s grotesquely enlarged cock, could only stare. The sheer, impossible scale of him was overwhelming. He shifted slightly, a tiny, experimental movement, and a sharp gasp escaped him at the feeling of being stretched so far beyond his limits. A dark, thrilling curiosity cut through his fear.

He leaned down, until his lips were almost touching Eli’s. “It doesn’t matter,” Kade breathed, and began to move again.

The movement was different now, a slow, grinding adjustment to this new, impossible geography. Every nerve in Kade’s body was screaming, stretched taut around a girth that felt like it would split him in two. Eli’s hands, now massive plates of bone and sinew, came up to hover uncertainly near Kade’s hips, as if afraid to touch him.

“Don’t stop,” Eli begged, his voice a low earthquake of need, the shame in his eyes warring with a desperate, physical hunger.

Kade nodded, breathless, and set a new, careful rhythm. He used his hands braced on Eli’s chest for leverage, the solid rock of pectoral muscle firm and unyielding beneath his palms. He looked down, his gaze traveling the vast landscape of Eli’s torso. The defined ridges of his abdomen were like carved stone, each one a hard, separate entity. The sheer scale was incomprehensible.

“My God,” Kade whispered, his voice hushed with a kind of reverent horror. His previous impression of Eli as just ‘big’ felt laughably inadequate now. This was anatomical exaggeration, a body pushed into a new dimension.

His curiosity, a sharp, clinical blade, cut through the haze of pleasure-pain. He needed to understand the map of this flesh. Still moving in a slow, deep cadence, he lifted his right hand from Eli’s chest and held it up, splaying his fingers. He pressed his thumb to the tip of his middle finger, making a rough circle, and then slowly lowered this makeshift caliper over Eli’s left bicep.

It didn’t even come close. His fingers couldn’t span half of it. The muscle was a dense, living cannonball under sweat-slicked skin.

Eli flinched at the touch, his eyes questioning. “What are you doing?”

“Measuring you,” Kade said, his tone devoid of anything but focused intensity. He dragged his hand down, palm flat, from the bulge of Eli’s shoulder to the hard point of his elbow. The distance was staggering, longer than any human arm had a right to be. He spanned the width of Eli’s neck with both hands, his fingers failing to meet at the back.

Each assessment was a silent, shocking revelation. He traced the sweeping curve of a pectoral, his fingers following the hard, defined edge where it met the sternum. He palmed one of Eli’s nipples, feeling the tight nub of flesh set in a disk of muscle wider than his hand.

“You’re a fucking monster,” Kade breathed, but there was no disgust in the words, only a raw, awestruck hunger. He leaned forward, his own movements stilling, and ran his tongue along the thick, corded column of Eli’s neck, tasting salt and the electric tang of the storm. He bit down, not hard, but with enough pressure to make Eli gasp and buck his hips upwards, sending a jolt of blinding sensation through them both.

“Fuck, Kade,” Eli groaned, his huge hands finally settling on Kade’s ass, gripping the flesh with a possessiveness that was both terrifying and thrilling.

“How much?” Kade demanded against his skin, his voice a ragged whisper. “How much bigger did you get?”

“I don’t know,” Eli choked out, his hips beginning to move in shallow, involuntary thrusts. “It’s never… it’s never been this much before. Not without the chamber.”

Kade sat up again, his own cock aching and neglected. He looked down between their bodies, at the terrifying, thick root of Eli buried inside him, and then back at Eli’s face. “Then we’ll find out.”

He started to move again, this time with a determined, driving purpose. He rode Eli with a fierce, punishing energy, each drop onto that immense cock a deliberate act of conquest and exploration. He watched the way Eli’s new muscles bunched and rippled with every thrust, a symphony of raw power barely contained.

“Tell me what it feels like,” Kade grunted, his breath coming in sharp gasps. “When it happens.”

Eli’s eyes were squeezed shut, his head thrashing side to side on the moss. “It’s like… like every cell is tearing apart and rebuilding itself at once,” he panted. “It burns. And it feels… god, it feels so fucking good and so wrong.”

Kade drove down harder, faster, the slap of their bodies a brutal counterpoint to Eli’s confession. The coil in his own gut was tightening again, a superheated wire about to snap. He could feel Eli’s control fraying, the massive body beneath him tensing, ready to shatter.

“Come for me, you fucking giant,” Kade snarled, leaning forward to sink his teeth into the hard curve of Eli’s shoulder.

The effect was instantaneous. Eli’s eyes flew open, wide and blind with release. A roar tore from his lungs, a sound so deep it seemed to vibrate from the earth itself. His body locked, his back arching violently off the ground as he emptied himself inside Kade in hot, pulsing waves that felt endless.

The feeling of being filled so completely, of triggering this cataclysm, was what finally undid Kade. His own orgasm ripped through him with a silent, seizing intensity, his come streaking across Eli’s stomach in ragged stripes.

He collapsed forward, his chest heaving against the immovable wall of Eli’s torso. For a long time, the only sound was their ragged, overlapping breaths steaming in the cold air. The forest around them was utterly still, the storm having passed and left a world washed clean and quiet.

Kade slowly, carefully, pushed himself up. He looked at the man beneath him, a creature of myth and science, now lying spent and vulnerable in the wreckage of his own body. The measurements were burned into his mind—the impossible dimensions, the terrifying scale.

Eli’s eyes were open, staring at the canopy of pine needles above. The shame was back, a palpable weight in the silence.

Kade didn’t offer empty comfort. He simply shifted, wincing at the profound, aching stretch, and lay down beside him on the damp moss, their shoulders not quite touching. The questions were a swarm in his head, but for now, in the eerie quiet of the aftermath, they could wait.

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