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Jak stormed out of the Hip Hog, onto the dim streets of Haven. Krew was, as always, the worst, but the payments for his jobs made it at least marginally worth Jak's time to take them. This time, the job was: back into the sewers, to collect some long-lost artifact Krew'd lost down there.

On the one hand: the sewers, gritty and grimy and full of rot, stagnant water, and overflow valves. Eco overflow from the factories, making the whole place smell like poisonous dark eco.

On the other hand — well, his last time down there had been pretty memorable. Metal Heads were a horny bunch, it turned out.

So that evening found him on the municipal elevator down into the sewer guts, Dax perched on his shoulder, the both of them saying goodbye to bright lights and fresh air as the double-reinforced doors slammed shut and the elevator roared to life.

This time they were down there to drain the place, hit the long-abandoned overflow pumps and drain the old rainwater; get down to the depths where Krew's last hire had drowned and lost his artifact. The water had been sitting long enough for shoals of fish to be visible down below, flitting under them through thick mats of algae as Jak rode his jetboard above, leaving a rippling wake.

The first pump was easy: just turn it on and watch the water churn and bubble, ebbing and ebbing, each wave revealing more of the formerly-flooded chamber: walls oozing, thickly overgrown with moss that was black in the dim light, water pouring down the sides for minutes afterward.

It was the next part that was more of a hassle: flitting over the still-flooded parts, what had been minutes ago drowned under ten feet of water, looking for the secondary valves through the forests of black moss. He and Daxter got to an old maintenance tunnel, under a factory probably: the room opened below them, only a rickety old catwalk spanning the gap to the other side. This room, like the rest, had been flooded, and the bottom was still: grit from factory outflow over who-knew how many years had formed a shallow lake of silty dark eco, with only the scattered mound of rocky metal and rubble like some grotesque coral growing out of the murk.

It was always kind of funny for Jak; all that dark eco waste lying around the city: nearly instantly fatal for anybody, but it was candy for Metal Heads. And, now, him too, apparently: he could feel the dark eco below him, a hum deep in his chest, pulling at the minute amount flushed through him. Turned out being experimented on for years had some bonuses, at least when it came to dark eco tolerance.

So Jak headed out onto the catwalk, and it collapsed under him. Of course. He took a tumble down, not enough to hurt. The layer of dark eco was only a few inches deep, roiling oil above a layer of thick grit. It buzzed up his legs, crackling eco energy burning into him.

Daxter, thankfully, hadn't fallen with him: he was clinging to the twisted remnants of a girder above, looking down with apprehension at the sea of dark eco below. Jak looked up at him: "You okay?"

"Yeah!" Daxter called down, tentatively craning his head over the edge of the girder.

"I'll see if I can go around," Jak started, and cut off when a loud growl sounded from the darkened corner of the room. Like they were unfolding from nothing, brilliant yellow eyes opened, and then more, and more still, until it looked like the corner and half the wall up were a gleaming sea of shifting eyes, waving and occluding each other.

"That uh, looks a little dicey down there, Jak!" Oh right, Metal Heads. Turned out draining half the sewers drew the attention of the things that lived down here, and to a Metal Head the eco silt here was fertile ground. They slowly padded forward on all fours, paws hardly splashing the eco.

"Don't worry about it," Jak called up, not taking his eyes off the group. It was a veritable pack, at least a dozen, snarling and hissing at him now as they spilled out of the dark corners.

It really wasn't something to worry about: with this much dark eco sloshing around on the floor it was easier to transform than not; Jak just gave into the pressure bearing down on him, let all the dark eco energy pour into him. Electric arcs burst out of him, lighting up the room in brilliant purple-blue flashes, and that was that. Dark Jak.

Jak looked up, teeth bared, claws out. It was kinda sad; everybody who'd seen him like this assumed he was some feral monster. Like they were fine seeing him shoot someone right through the head, but the second he got up close and personal and tore someone's head off that was crossing a line, even though it was the same corpse either way. Torn'd said, "well, keep that monster under control in the city;" Sig'd whistled approvingly but then asked if he needed to stay back if he didn't want Dark Jak to go after him too. Jak left them their fantasies above his evil side; seemed mean to crush their happy little dreams that he was well-adjusted.

It'd been a while since he'd gotten to do any mayhem, anyway. Too much fucking. But he was back in action. The Metal Heads snarled at him and he snarled right back, claws tearing rents in the floor plating as he loped towards them on all fours.

Except — a particularly huge Metal Head loomed up in front, snarling, and Jak jerked back. There was something about it... except, of course. It clicked, heat flooded all through his body. He sure as hell recognized that big scratch across the Metal Head's shoulderplate. That wasn't just any big Metal Head, that was the one —

Well, that was the one that'd started the bizarre monster fuckfest his life had turned into these past few days. Yeah, he recognized that one.

"Hey there, big guy", he said, voice lower and rougher. Talking was the hardest thing when he was Dark; his vocal cords seemed mostly there for screaming and growling; speech not so much. It rasped his throat. And anyway, he could kill some people later, if he really wanted. No rush. Fucking was just as much fun anyway.

The big Metal Head went from its low, slinking approach to big eager bounds, leaping the final distance and slamming into his chest, paws first — claws spanning up his chest, like he was showing off how he could've impaled Jak easy if he really wanted too. He nuzzled against Jak's neck, and he raised one clawed hand and carefully scratched at the Metal Head's crest, just beside the skull gem. It was still weird to be acting like they were pets, especially after he'd let so many of them fuck him.

"Uh, Jak??!" Daxter said, above, and — oh right. The thought running through his head wasn't "oh right, Daxter's here," but "oh right, Daxter wasn't there before." That Dax hadn't seen him get railed by a pack of Metal Heads yet.

Well, there was a first time for everything. "It's fine, Dax," he said, looking up — Daxter was looking down at the Metal Heads, slowing inching back down to the base of the girder. A few of the pack had gathered below him, jaws open, slavering. He reached over and bopped one in the snout; not hard, but hard enough. "Don't try to eat Dax."

"Uhhh, Jak?" Daxter said, louder and for some reason more worried.

Jak laughed, a hoarse chuckle. "Last time I was down here I ran into these guys. They're friendly."

"Friendly?! And— how exactly did you figure that out?"

The big Metal Head, maybe thinking it was time for an object lesson, or maybe just getting impatient, rose up on his hind legs and shoved Jak back, pinning him to the wall. His sheath jabbed against Jak's stomach, not hard yet but sure as hell present. He opened wide, licking a messy stripe across Jak's face, down his shoulder, where he bit down with a big meaty chomp. Jak groaned, rutting forward — sure as hell hard now — and met the bite with his own, fangs sinking into the meat of the Metal Head's neck. His teeth were sharper. The Metal Head roared and pulled back, tongue splattering across Jak's face, bloody tongue lapping over his lips before it shoved into his mouth. Jak groaned, sucking on it, eco-tainted blood and Metal Head drool bitter and heavy in his mouth.

"Jak! Jak? Jak!!" Daxter was saying, like he was on the verge of a panic attack, so Jak pulled away from the kiss, snarling up at him.

"C'mon Dax, I know you watch me jerk off." Daxter sputtered, gawping. "Why not watch me get fucked too?"

"You— They're Metal Heads!" Daxter yelled, throwing his hands up in the air and nearly falling from the beam. "Wait, get fucked?" His head peeked out over the edge, eyes wide.

By that time, though, Jak was — impatient. If he wasn't gonna kill anybody then he sure as hell wanted somebody's cock in him. He dropped to his knees, dragging his hands over the Metal Head's underbelly, careful with the claws, and tugged on his sheath, lapping at the tip as it started to unsheath.

Then, after a second's thought, Jak twisted around, pinning the Metal Head against the wall he'd been against, just to give Dax a better view. By his sharp inhale, he liked it.

Things tasted different as Dark Jak, not that he'd had a lot of chances to find that out. Blood, mostly. But Metal Head pre — that too. It was probably all the dark eco in it. Jak nosed against the Metal Head's sheath, cock spilling out across his face, rank smell overlaid with the extra sense, chemical bitterness and rusted metal with an added depth to it now. Jak lapped up the Metal Head's slimy shaft, black tongue gathering up sludgy pre, and caught the half-hard head on his tongue, its huge upper crest still spongy and soft. Jak had to be careful with his teeth; they were a hell of a lot sharper now.

But judging by the Metal Head's crooning, he sure liked what Jak was doing so far. Jak took a glance over, spitting out the tip of the Metal Head's dick, watching Daxter watch him, mouth hanging open, eyes fixed on the two of them like he just couldn't believe what he was seeing. The Metal Head cupped Jak's head with a paw, pressing Jak's face back along his cock, length twitching with a rubbery spasm, slapping to the side, and spat a messy gush of pre across Jak's cheek. Jak groaned and leaned in, lapping all up the shaft, sucking wetly on the tip.

The other Metal Heads were getting restless, though. All of them were male that he could see, and that gave him a little spark of humor; the big Metal Head was, what, building up a gang of gay Metal Heads? Bragging about how he'd totally bagged a human? One butted his head across Jak's side, teeth latching onto his coat, and a second later he tried using his paws, scrabbling up his side and smearing dark eco all over, the oily substance soaking through his clothes and then crackling, arcing out purple eco lightning as it got sucked into Jak's body through his skin. Jak figured he might as well help them out though: it was much more of a hassle undoing his belt with two-inch claws on his fingertips, but he got his pants open and spread, and then there was a growl and a yelp and a Metal Head had tried mounting him, head jamming between Jak's shoulderblades and shoving him forward, immense heavy weight of paws on his back, the Metal Head's cock unsheathed and rutting up and down his back, spurting watery grey-black pre over his pallid skin. The Metal Head dug his hind legs against Jak's thighs, pulling his pants down in shuddering jerks, forepaws scratching at the bare strip of flesh revealed between his coat and pants, digging rents into his skin as he worked Jak's pants down.

Jak focused on sucking the big Metal Head's cock, slower and more careful than he was used to with his mouth full of fangs, just sucking on the tip, letting a slobbery mess of pre and spit drool from his mouth, the both of them tainted eco-dark, hands wrapped around the huge shaft and pumping slowly, forearms braced across the Metal Head's thighs to bear the weight of the Metal Head mounting him. That one finally got his cock in position, Jak's pants down his thighs, ass on display, and the Metal Head drew back, cock spurting watery bursts across his ass and thighs — the Metal Head gave him a lick, just two drooling licks against his hole, before he reared forward again, cockhead skidding across the cheek of his ass and ramming against his hole. Jak groaned, pushing his ass back, letting his asshole spread open as the Metal Head bore down, the very tip digging into him, crested cockhead digging into his slower, the motion surprisingly slick, lubed with each spurt of fresh pre.

Jak glanced to the side again: Dax was still watching, wide-eyed, one arm slung around the beam but the other out of sight between his legs, and the steady stroking motions, Dax's hips jerking forward, told Jak all he needed to know about that.

Pinned between the two Metal Heads, nearly a dozen surrounding him, Jak closed his eyes, focusing just on sucking cock, easing more of the Metal Head's shaft past his sharp teeth, letting the head push deeper, crest scraping the roof of his mouth. He groaned, gurgling as the next pulse of pre hit the back of his mouth, swallowing to try and drink it all down. Jak was achingly hard, cock untouched, bobbing as he took the Metal Heads' thrusts, the slow build of his orgasm almost painful, eco bubbling and boiling inside him, lightning crackling out around him, arcs flitting between the Metal Heads' chitin plates.

The Metal Head behind him crooned, hips jerking forward and drawing back, building up a rhythm as he slowly sunk more of his cock into Jak, crested cockhead shoving deeper, dragging against the walls of his ass on each withdrawal.

Jak let the thrusts drive him forward, his own cock rutting against the big Metal Head's legs, his paws clamped across his head, dewclaws digging behind his horns. Jak growled, hands curling around the Metal Head's muscled flanks, claws scraping across his thick hide. He ground back, hilting himself on the Metal Head's cock, cockhead throbbing deep inside him, and swallowed the mess of pre gushing into his mouth, growling low in his chest as the Metal Head behind him rammed his prostate again, panting in wet bursts across his shoulders.

Heat boiled in him, faster and sharper. Jak snarled again, on the verge of coming, surprised to see more eco lightning spray around him, dancing across the Metal Heads' plating, earthing itself in the thick eco soup they were all two inches deep in. He tipped his head back and roared, orgasm painful as it burned through him, cock erupting in gush after gush, sloppily spurting all across his chest and the plating before him, dribbling down into the dark eco below.

Except — the Metal Heads pushing in all squabbled to get closer, a half-dozen heads trying to shove beneath him, tongues lapping at his stomach and flushed-black cock. Even the one fucking him tried to get into it: whining and twisting to the side, paws sliding across Jak's back as he curved down to the side, muzzle scraping down his side, tongue lapping over his hip.

Jak looked down, dazed and hazy from the strength of his orgasm, to see his come smeared across the Metal Heads' muzzles: brilliant gleaming strands of refined dark eco, rich purple, with a core of burning light where it had collected into opaque blobs. His afterglow was still ringing through him, washing back and forth like ripples across his skin, and seeing that it was easy to focus, focus on the pulse of his body, the wash of dark eco roaring through him. He groaned, leaking again; it hadn't been even seconds and his cock was dribbling again, burning with electric jolts as he spat out a pulse of pre, watery black eco, not that dissimilar from the gasoline-slick pre the Metal Heads were slinging all over the place.

He groaned, heat pulsing hotter and hotter, the veins feeding his cock standing out in stark relief, running black as he came again with a pained howl, spurting refined eco right across the mess of Metal Head faces beneath him, pulse after pulse being gulped down, tongues coaxing his cock until it was overstimulated, burning with each swipe of a Metal Head's tongue.

Then the big Metal Head realized what was going on. He screeched, just as eager as the rest of them to get his mouth on Jak's cock and a whole lot more willing to throw his weight around. He knocked Jak backwards, huge cock ripped away from his mouth, and dove down, almost sending Jak and the Metal Head buried balls-deep in his ass sprawling on their backs in the dark eco pool.

The thing with dark eco — that Jak was just now connecting in his sex-fogged brain — was that he'd known that the Metal Heads used dark eco for reproduction; all those eggs laid in eco baths; but he'd never really connected that to fucking. And Metal Heads grew huge, they drank dark eco and metamorphed into new forms, but he'd never thought — The Metal Head's tongue slid along his cock, long flexible muscle wrapped entirely around the base of his shaft, steadily milking him, and he came again with a feral snarl, blackened balls churning as he sprayed an enormous gush of refined dark eco straight down the Metal Head's throat. The Metal Head's hide creaked like soft leather, dark eco sizzling under his skin, burning through his heart and sending his body growing beneath Jak's claws.

But Jak sure hadn't thought he'd come refined dark eco when he was Dark, either; that was another thing he sure as hell hadn't known. He groaned, sprawling forward over the huge Metal Head's back, letting the Metal Head suckle eagerly on his cock, drinking down Jak's latest gush of come. The Metal Head's body groaned beneath him, and each pulse of come was followed not even a second later by the Metal Head shuddering, hide creaking as it grew: muscles growing, fresh plates of metal erupting from its skin, skull gem burning brighter and brighter.

Sprawled across the Metal Head's growing back, booted feet sunk into the thick puddle of dark eco, it felt like — a circuit had been closed inside him: eco charge pouring into him, drawn up from the ground, burning through his calves and thighs before it soaked into his cock and balls, only to erupt outward seconds later, body a living eco pump for the Metal Head to drink from. His body spasmed with each pulse, the rush of a perfunctory orgasm hitting him and passing through, body limp as he blasted another thick load into the Metal Head's mouth, clawed hands scrabbling at the Metal Head's back. The Metal Head fucking him righted himself, sliding forward again, and the bone-jarring ram as he bottomed out was just a distraction compared to the burning electric charge of each pulse of his cock, crackling eco lightning webbing across his thighs, stinging and hot. Jak panted, dazed from the eco cycle pumping through him, like a second heartbeat.

The other Metal Heads pushed closer, heads swinging down to nose at his thighs, tongues lapping against his grotesquely-swollen balls, thick spidery black veins bulging to the surface and spreading across his thighs and stomach. The big Metal Head — even bigger, now — growled at them with Jak's cock still sunk down his throat, vibration sending a bolt of eco lightning across the both of them, webbing across his neck and Jak's thighs. Jak staggered back, dazed, glowing purple-black tar spilling past the big Metal Head's lips as his cock pulled halfway out — revealed skin black, glowing purple veins bulging to the surface, and then he thrust forward, hips meeting the tip of the Metal Head's snout with a smack, bloated balls swinging forward and bumping the underside of his muzzle, another eruption of eco spraying down the Metal Head's throat.

Jak came again, and again, the pleasurable spike of orgasm fading into a steady throb of ejaculation. The time between coming could've been measured in seconds: an electric charge burst into his balls, pulsed up inside him, and his cock erupted over and over, a near-constant stream of thick dark eco spurting into the Metal Head's hungry maw. It hurt, but it felt good too — the same burn as when he transformed, but at a low ebb, constant, and mixed in with the tinge of orgasm. The Metal Head grew beneath him, muscles of his shoulders and back growing and growing under Jak's hands, forming thick swells and ridges, sharply defined alien anatomy.

The Metal Head fucking him came: a chittering roar behind him, the cock pumping inside him erupting in a sudden gush of heat, spurt after spurt, but compared to the eco burn of his continual orgasm it was a footnote. Jak remained sprawled over the Metal Head's back, boneless, groaning, as the Metal Head behind him dismounted, cock pulling from his ass with a squelch and a flood of hot quicksilver come spilling down his thighs, only to be replaced by another one instantly, fresh cock slotted between his cheeks, paws digging into the skin of his hips as the Metal Head lined up and shoved deep into his already-used hole, the other Metal Head's load squelching out of him on the first few thrusts, churned up inside him and gurgling out around the new cock. Come poured down between his thighs, hot fluid cool against his overheated balls, grown grotesque and lopsided as eco poured through them; it felt like they should be steaming, come boiling up inside him as the eco charge earthed itself endlessly into him.

Jak couldn't tell how long it went on for. His body throbbed, pulsing with the beat of eco energy circling through him, feeding the still-growing Metal Head under him. His body was dead weight on the Metal Head's back, shoved back and forth by the succession of Metal Heads mounting him: each one blowing his load and making room for the next, until his ass was a gaping, drooling mess, pouring out a thick slurry of their combined loads, shining quicksilver come splattered up and down his back, drenching his legs in solid rivers. Just an eco-pump dick and an open hole for the Metal Heads to use. Maybe they all had turns; maybe they took seconds or thirds. All he really knew was the stretch as each one sunk inside, flooded ass gurgling, displaced come pouring out of him, a raw groan being torn from his throat each time as whichever Metal Head was fucking him sunk effortlessly to the hilt, and then the pounding force of their thrusts: paws on his hips, paws on his shoulders, teeth on his neck, all keeping him steady as they emptied their balls into him over and over, each orgasm a flood of wet weight inside him, slowly slopping out of his broken hole in the rare seconds between when one pulled out and another shoved in to take his place. The dark eco beneath him was muddied, roiling black ooze thinned by the sheer volume of quicksilver come spilling out of him, churning it into a shining purple-black mess, the two substances separating like oil and water, just, slower than they were being churned together.

The Metal Head below him transformed fast: hide creaking, shedding old skin in faded shreds; glossy chitin plates scraping against each other; burnt-eco ozone stench wafting up from his body; shoulderblades spreading between Jak's hands. Just growing and growing as he fed on Jak's tainted come, bigger and bigger until he had trouble even fitting under Jak, head the size of Jak's torso, scrabbling down with his forelegs on the ground. He got impatient, or maybe was happy enough with that much of a metamorphosis: he surged up, knocking Jak back onto his ass, hands sinking into the thick goop of the dark eco, heat burning up his arms, eco lightning arcing from his arms to the ground, filling the air with the acrid smell of ozone. The Metal Head roared — echo reverberating back through the tunnels, distorted and low — and reared up on his hind legs, old skin tearing like paper as he twisted, paws clawing the air before he came down with a bone-rattling thump, sending up a wash of dark eco that splattered Jak's front.

All that eco had been real good for him, it looked like. Before he'd been big for that kind of Metal Head; tall for a person when he stood, but now he was enormous: as tall on all fours as Jak was standing, big as a Krimson Guard hellcat cruiser, head a mass of overlapping metal plates, skull gem actually arcing, burning scorch marks across his metal-plate chitin with each burst of brilliant yellow electricity. Head as big as Jak's torso, hell, forepaws as big as Jak's torso, hind legs drawn out into an immense lizard-like swoop, thick webs between his toes, and huge enough that he could flatten Jak in a single step if he wasn't careful, and also if Jak wasn't nigh-indestructible right now.

Plus, he had a big dick. That's where Jak's eyes went: right between the Metal Head's haunches, getting an eyeful when he'd reared up. The Metal Head had been huge before, but now his cock was titanic, too-huge even for the Metal Head's newly-gigantic frame. It spanned most of his underbelly, too big to get iron-hard; it lolled behind the rest of him when he reared up, dragged down by its own immense weight, and when he landed it slung down so far that it slapped into the eco slime under them, bouncing back up with thick cords of black eco webbed across the underside, crackling out arcs of lightning across his cock.

The Metal Head's cock had the same crested cockhead as the rest of the Metal Heads: a blunt spear-tip head, but with a swooping crest spanning backwards from the tip. But now the underside was covered in a thick spray of spines, each as large as a finger, twisting gently, pulsing with the Metal Head's heartbeat, thin strings of pre and dark eco webbed between them in an oozing mess. The shaft was so huge it had to be reinforced: the round shaft distended into a fat, bottom-heavy oval from the sheer size of it, and there was a band of gristly skin pulling it back into shape midway down, wrapping around his shaft in a band as thick as Jak's palm, like a thick ring wrapped over his cock, and it too was thickly-grown with blunt spines. The flesh below the ring was thick with veins, gnarled things squirming up his skin, bulging up over the lip of the ring, to only slowly submerge deeper into his cock as they crept higher. The veins grew thicker and thicker further down his shaft, until the base was a gnarled mess of overlapping veins as the root vanished back into his grotesquely-spread sheath, gasoline-slick fluid oozing out from the opening to match the continual drool of pre.

His sac was gigantic, huge swell bigger than Jak himself, and that was drawn taut, skin furrowed deeply. His balls were so asymmetrical it was impossible to tell if he still only had two: his sac bulged out in a half-dozen areas, packed full of lumpy tissue or corded tubes, swaying back and forth against his thighs with a wet clap as he strode forward, supple hide glistening with sweat and pre and oily eco.

Jak wanted it in his ass, like, ten minutes ago, and from the Metal Head's long, eager growl, tongue lolling out over his fangs, he was in agreement. The Metal Head padded closer, each step vibrating through the stones, sending the thin layer of dark eco rippling. His muzzle opened wide, purple-black tongue lolling out to swipe a drooling trail across Jak's cheek, and then he butted the flat of his muzzle across Jak's side. Wanting him to roll over.

Dark Jak could take a hell of a lot of punishment, but it looked like that dick was gonna push him to his limits. He rolled over: on his forearms and knees in the eco murk, thick tendrils of dark eco cording up his bare arms, black veins standing out starkly from his pallid skin. Usually he had to worry about running out of dark eco, transformation sputtering out and leaving him weak and dazed — but sunk two inches into this mess of eco he really didn't have to worry about that, with the bitter metal taste of dark eco growing stronger and stronger in the back of his throat.

The Metal Head couldn't even mount him: he just stepped over Jak, forepaws past his shoulders, cock an enormous pillar of flesh slapping across Jak's back, slinging cloudy black precome over his skin, sizzling hot as it spilled down his hips. The Metal Head ground down, sheath grinding against Jak's ass, the gnarled root of his cock a lumpy mess lurching between his cheeks — and his cock spanning up Jak's back, tip dribbling in his hair, thick bristles on the underside of his cockhead scraping the back of his head. Well, he wasn't gonna worry about trying to fit the whole thing.

The huge Metal Head actually had to take a few steps back, cock a padded iron weight dragging down his spine until the tip spilled off his hips, crashing down into the eco murk before it lurched upward, a spasm in the Metal Head's underbelly sending it swinging to the side, hitting Jak's side with almost enough force to knock him over. Jak reached back, clawed hand cupping the side of the Metal Head's enormous cock, hand covered a half-second later by the Metal Head's own paw, reaching back to aim it straight at Jak's ass.

The tip was lubed with pre and raw dark eco, electrical bursts arching between them as the Metal Head aligned his cock, crackling louder when they finally made contact, charge earthing itself into Jak's ass with an electric jolt the second the tip dug between his cheeks. The cock bounced, the Metal Head's underbelly twitching, tip digging up and down against his gaping hole.

Jak growled, body far too small to fit it, just the flat of the cockhead nearly as big as his spread hand, the crest atop easily twice that: even with his hole broken open wide; even with Dark Jak's unnatural physical resistance, it was just too huge. But he still shoved himself back, a wild, animalistic growl buzzing in his throat as he tried to impale himself on the Metal Head's cockhead. His skin was slathered to dripping with come, shining rivulets streaming down around the Metal Head's cockhead. Jak braced his hands against the plating beneath, sunk wrist-deep in the eco murk, and shoved himself back, yawping and yowling like he was a Metal Head himself as he bore down, asshole twitching and spreading and twitching and spreading, muscle tremors running up his arms and legs, entire body lurching with the force of it when the flat tip shoved inside, Jak's spasming ring spilling across the start of the crest, lopsided sa the Metal Head shoved inside.

But that little amount of leverage just made the both of them try harder: the Metal Head above him growling and crooning, jaws snapping on nothing. His cock lurched, almost popping entirely free from Jak's ass, and a gush of pre that was bigger than any of the other Metal Heads' loads scorched its way inside him, an immense weight of slobbery fluid, gurgling into his already-overfilled ass and erupting out around the Metal Head's cockhead, a loud crack as it poured down into the slurry surrounding him, sluggishly washing across Jak's calves and forearms. The Metal Head's cock twitched, cockhead crest fluttering, a flood of slime spilling out of him as that broke what little seal there was between their bodies. Jak huffed, breathing hard, ache in his muscles like he'd never felt before as Dark Jak, and kept grinding backwards, sharp yelps coming from his mouth every time he felt his asshole give an inch, abused muscle stretching just a fraction more, letting an almost infinitesimal span of the Metal Head's cockhead lurch inside him. The tendrils along the underside scraped across his bruised rim, ever-so-slightly prehensile, shifting and squirming as they tried to pry their way in, lurching inside one by one, more always pressing against the straining rim of his asshole.

Jak whined, sharp and high, wiggling his ass backwards, slurping noises coming from his broken ass as they both slowly worked him down on the Metal Head's enormous cock, the cockhead alone — the tip jarred against something inside him, and Jak let his head hang, surprised to see his stomach lurching and swelling, the cockhead alone bulging his stomach, a swell rising and rising as more sunk inside him, spines scrabbling like bugs squirming around inside him, rubbery spikes stroking along the inner walls of his ass.

The Metal Head bore down, Jak's legs nearly going out, slamming him to the ground, and his paws wrapped over Jak's shoulders, the Metal Head bodily shoving Jak down on his cock. The cockhead lurched again, churning up Jak's guts, fractionally more working inside him, syrupy squirts of pre and come erupting from around his brutally-stretched ring, spraying down the rest of the immense length of the Metal Head's cock. But, fuck, it was working — Jak could feel the cock sink deeper inside him, the widest part of the crest slowly sinking inside him with a disgusting wet squelch. After that it was clear it was all gonna fit, but even then it never just lurched inside, sunk in a single thrust. They both had to put in the effort. Jak whimpered and whined, panting like a dog, body strained to its limits. His entire body was tense, abs clenched hard, except then he realized that was working against it, cramming the Metal Head's cockhead between his pelvis and abs. He relaxed, his stomach bloating into a smooth swell from the underside of his pecs down to his hips, bulging like he was pregnant.

The Metal Head's cock jerked, throbbing, and dragged Jak a foot sideways as it swung, stomach dimpling outwards from the abrupt shot of pre, audibly sloshing now inside him, soggy cracks from inside his body as a wave of pre poured to one side and then another, guts feeling like a single swollen hollow, half-flooded with slime. The thick spines scrubbed at his ass, each one feeling like an iron-hard spike jabbed inside him — Jak didn't really feel pain when he was Dark Jak, but the heavy discomfort was strong enough for him to tell he'd probably be in agony if he wasn't transformed. So it was a good thing he was transformed.

Jak groaned, the reverberation in his chest echoing down across the Metal Head's cock, and it lurched again, swinging him to the side as it erupted in a massive gush of precome, hollow slops echoing from inside his bloated gut. His cock pulsed weakly, a thick cord of dark eco drooling from the tip, a pillar running from his flushed-black cockhead down into the sludge beneath him, jiggling slowly, taffy-like, every time the Metal Head moved at all, Jak's body practically just puppeted on the tip of his dick, taking all his strength to damp some small amount of the force of the Metal Head's twitches; to keep himself from simply getting lifted up in the air, pinned against the Metal Head's underbelly.

The Metal Head ground forward, cockhead lurching deeper, bulging Jak's belly before he pulled back, the minute withdrawal straining Jak's body just as much as the thrust forward. Jak sunk his claws into the metal, gripping hard, body scraping forward under the force of the Metal Head's thrusts, bulging stomach submerged in the sloshing eco mire — but the Metal Head found purchase, jarring forward and jerking Jak back, entire body lurching upwards, his front slathered in gooey strings of dark eco, burning across his swollen gut as it soaked into him. The Metal Head's thrusts found some semblance of rhythm, forward and back, dragging Jak with the force of it, ramming deep.

Jak let out a low groan, and his stomach — bulged. More than before, his flesh crackling with eco energy as it distended. His skin was rubbery and heavy, tinged a bruised purple-black from the sheer amount of eco soaking in him. The Metal Head's cock lurched forward, slowly stretching his skin further, until his flesh was drawn taut along the planes of the Metal Head's cockhead, a smooth cone bulging out from his rounded belly, Jak's body inhumanly stretched around the mammoth cock. Jak panted sharp and fast, whining in his throat, body shuddering with each pulse of the Metal Head's cock, one hand clutched to the curve of his bloated belly, the tremors of the Metal Head's cock rippling up through his skin.

The Metal Head drove forward, cannon-barrel shaft sliding through his grotesquely spread hole, cockhead throbbing and thudding inside him. Jak's inhumanly-swollen gut stretched more, rubbery skin distending with elastic snaps, something like stretch marks forming across his flesh, stinging raw skin flushed purple-grey, stretching and shredding more. His entire body felt like a sheath for the Metal Head's cock, flesh and bone just there to be a covering around the Metal Head's gigantic cock, pulsing and clenching with his reflexive muscle spasms, each one coaxing out a fresh gush of black precome, sloshing and spilling inside him, crashing side-to-side against the walls of his bloated body.

Jak squeezed his eyes shut, whining low in his throat, the wet slap of the Metal Head's tongue across his face unexpected, drooling slobbery spit across his face, into his open mouth. It was long, hanging down from the Metal Head's muzzle, curling under his chin and wrapping around the other side, thick spit matting his sweat-soaked hair into hanks.

It didn't even take long — the brutal penetration might have been slow, but the Metal Head came almost before he started thrusting; between the new body and the gangbang before hand he might have been on the edge for a while. Jak wasn't exactly the most active partner, just able to groan and whine, broken body convulsing weakly against the pillar of his cock, just arrhythmic squeezing. Maybe the Metal Head just really got off on fucking humans. If Dark Jak counted as human, exactly. It wasn't long before the Metal Head's breathing got ragged, tongue slithering down to coil around Jak's neck, animal yelps coming up out of his throat.

His cock pulsed, twitch ripping Jak's limbs out from under him, jerking him an inch in the air before sending him dropping back down to the floor, cock pulsing a spray of slime inside him, thicker now than the watery mess of precome. Jak groaned, cupping his belly, pallid skin flushed a grubby grey, thick zebra-stripe stretch marks in raw purple-black, and then the Metal Head gobbled again, cock twitching and slamming Jak's back against his underbelly, spurt of come a firehose blast that knocked the air out of his lungs, a shocked exhale as Jak tried to breathe in, struggling against the sheer mass of cock and come inside him. Each wash of come felt like a load of rocks dumped inside him, roiling fast, churning in thick blobs inside him, bloated gut stretching and stretching as his skin frayed. The Metal Head twisted, paws slamming into the shallow eco puddle around him, and his cock lurched, flexing, the seal against Jak's brutally-stretched asshole flexing just enough for a squirt of come to gush out of him, pressurized from the sheer volume inside him: a shining arc of silvery come gushing down the length of the Metal Head's cock, a bright sheen coating the black flesh and dribbling down in quicksilver dots to the dark eco below.

Jak groaned, clenching, another spurt of come erupting out down the Metal Head's shaft, nothing compared to the roiling sea still inside him. Each fresh spurt came with a sharp twitch of the Metal Head's cock, Jak all but a puppet, jerked up again and again, abused flesh stretching and stretching until he looked beyond pregnant, even with sloppy come continually oozing out of him now, gushing in a burbling stream down the Metal Head's cock. Not even a third of it was in him, an immense pillar of flesh throbbing and pulsing outside him, spines and veins all fluttering and flexing as the Metal Head unloaded in him, hardly more than the tip nestled inside Jak's body; even just that nearly too much. Jak went limp, stomach shuddering and rippling with each pump, gasping for breaths between shots, the continual gurgle of come gushing out of him growing into pressurized squirts when the Metal Head shot, again and again, unloading balls bigger than Jak, every part of the Metal Head's body sent into overdrive by Jak's eco come.

A paw came down on Jak's back, slamming him down into the eco — bloated stomach catching the impact, come squirting with extra force from his overfilled ass — and the Metal Head wiggled backwards, trying to pull out. The crest of his cockhead hit Jak's pelvis and skidded up, flaring inside him, an added stretch that made a ripple of nausea run through him; it felt like his body was just a mass of flesh loosely stitched around bones, and here was the Metal Head's cock twisting and tugging inside him in ways his body was never meant to withstand. Jak whined, all he could do, squirming minutely on the Metal Head's cock as he tried to pull out, slowly working his cockhead back and back through the comparatively narrow opening of his pelvis — each throb feeling like it was just about to split him in two, crack his hips in half — until with a pop like the bung of a cask getting pulled the Metal Head tore out of him.

Jak jerked forward as the Metal Head pulled back, leaving Jak sprawled facedown in the eco pool. Jak took a burning inhale of dark eco before he lifted his head up, gasping wetly. His broken ass was a waterfall of quicksilver come, the Metal Head still coming, back pelted with spray after spray of come, slapping into him with enough force to keep him pinned to the ground, thick eco and thinner come building up into a messy slurry around him, webbing over the backs of his arms and legs, all but burying him in come. It felt like the Metal Head came for just as long as they'd fucked, minutes-worth of orgasm, burying Jak until there was more come piled around him than eco.

Afterwards — Jak was a fucking mess, and the Metal Head hardly looked better, near-unconscious for how he'd just came his brains out. The rest of the Metal Heads — Jak had honestly forgotten they were there — had been watching the whole time. Daxter too; Jak hadn't forgotten about him for a single second. He hoped he'd liked the show. Jak was still bloated, pregnant-looking, come pouring out of him continually. Jak was downright glazed, body a shining mess like he'd been, well, dipped in a vat of silver and then pulled out, shiny come slowly surfacing in the murk below, separating out from the eco in complex splotches and lines. Jak blinked a few times, eyes stinging, the afterimage of the lights reflecting of the come superimposing over everything, just a throb of light.

He groaned: "Urgh," or something like it, and tried to shamble to his feet, hips screaming in protest. He spat, not really sure what he was spitting out; something thick in his mouth, panting for breath, listing across the sides of the huge Metal Head — heaving too.

There was a slope out of the eco pit, thank fuck; Jak did not think he could manage steps right now. Even walking was nearly too much. He feet coming out of the dark eco hit him like a bolt, the swampy sea cut off, suddenly aware of how he was burning through his own reserves — eco finally sublimating out of his skin, body so suffused that he was practically glowing from it, hissing eco haze wafting behind him as he shambled up, leaning against the side of the equally slowly-plodding Metal Head. Who just about filled the corridor, Jak walking with his other hand at his hip, fingers catching the damp walls, all the rest of it filled by the Metal Head's now-enormous bulk. Each step came with a wet squirt, the sides of his bruised asshole sliding against each other, motion pumping a messy burst of come out, pouring down his legs. He was leaving a trail behind, a solid line of glossy come on the deck under him.

He made it to a circular room, up above the former waterline, before he just leaned back against the wall and found he couldn't muster the energy to push himself fully upright again. The huge Metal Head bumped against his side, the impact sending a wash of pain through him, drowned beneath the constant dark eco throb running through him.

"I'm fine," Jak said, one hand aimlessly feeling out until it slapped across the Metal Head's face, claws scratching his chin. "Y'know if you weren't such a size queen you coulda stopped sucking me off earlier, and then you coulda actually used your whole dick." Jak took a few breaths, each one matched with a wet glug, quicksilver come still spilling out of him, pouring over the rim of his stinging ass. "I really gotta stop letting you fuck me before I actually get the shit I'm down here to pick up." He was just rambling now, talking to feel his throat move. "At least you didn't break my fucking gun this time; I had to pay to get the barrel replaced, y'know."

"Nah, don't hang around," Jak said. "I'll be fine." He was dimly aware of the pad of Metal Head feet, the rest of the pack leaving, one or two giving him a farewell swipe across the face, paws patting his side. And then the pad of Daxter, approaching feet slower.

The haze around him burned stronger, flecks of purple light like the sparks of a fire, heart pounding beneath his eyes, making everything go grey. Jak went down on his knees, cock lurching with the motion, an enormous heavy thing between his legs, far too big, dark eco practically boiling inside him.

"You okay?" Daxter said, reaching out to touch and then flinching back at the sharp crack of eco lightning bursting between them.

"'ll be fine," Jak repeated, eyes still shut, mostly unconscious. Jak twisted his head, horn scraping the hall plating, raising one clawed hand to tug on his cock. He was exhausted, but it was just — some hindbrain part of his mind still wide awake, hungry, desperate.

He was swollen, cock bloated so huge he couldn't wrap his fingers around it, flesh spongy and soft, pulsing beneath his hand like his heart was beating doubletime, eco churning inside him at a rhythm that had nothing to do with his heartbeat. His cock lurched, a twitch that took seconds to ripple all the way through his cock, ended with spraying a mess of glistening slime from the tip. Jak groaned and tried to stroke himself off, Metal Head drool and come slopping smeared all across his shaft and hand, making his thrusts frictionless.

Jak came with feral yowl, cock pulsing and pulsing, dark eco sucked out of the rest of his body, pulled down to his cock as he sprayed it out, purple-black ooze with glowing beads, churning up inside him as he came his brains out, hosing the metal deck down in a tarry layer of refined dark eco.

His Dark Jak transformation burnt out with a snap, ache doubling up as the eco haze around him finally burnt itself out, leaving him — just Jak: body aching, head pounding, only barely able to keep him from faceplanting in the swampy mess of dark eco sprayed beneath him. His heart pounded in his chest, a head-rush hitting him hard when he tried to move, vision greying out entirely as he panted, skin clammy with cold sweat, just sunk against the side of the corridor, waiting for it to pass, sound tinny in his ears, attenuated. He cracked open his eyes, even the faint overhead lighting bright enough to hurt, and caught Daxter staring, hands in front, trying to hide his dick. Like he hadn't jerked off to the whole thing.

"Izzat usually how things go?" Daxter asked, wide-eyed and worried.

"Just about." Jak took a few more breaths, rasping, and spat to the side, spit threaded with dark eco still. "Think you could find some Krimson Guard crates?" He tried to get up, caught the barest hint of the throb in his hips grow to a stabbing pain, and went limp again. "Don't think I'm gonna be getting up until I can get some healing."

"U-uh, yeah, sure," Daxter said and scampered off, clatter of his paws on the plating loud even in the distance.

Jak sunk back against the wall mostly-unconscious, waiting for Daxter to come back. Fuck but did the Metal Heads fuck hard. His lips curled up into a smile, shifting his legs under him. He'd really have to keep that dark eco come trick in mind for next time. And, fuck, maybe learn when his eyes were bigger than his ass. Or maybe figure out that dark eco trick; see if he could train himself to take the whole goddamn thing and watch his stomach jut out four feet in front of him. Either way.