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Sig was just getting out of the shower, back from one of Krew's shit jobs and estimating he'd be back long enough to sit down and actually live in his place for a while. He tugged on some loose drawstring pants and thin undershirt, and then turned to see that there was a face pressed up right against his third-floor window.

"Shit!" Sig yelled, manfully, and jerked back as Jak climbed right in through his kitchen window without so much as a how-do-you-do. Well, the window closest to the oven; that made it the kitchen window in a one-room apartment.

"Torn had me working on resistance bullshit for the past week out in the barrens," Jak said, already stripping. His channeling ring came off first, and each time he just dropped it, not caring how it left a fresh gouge in Sig's floors each time. "I didn't have the privacy to jerk off the whole fucking time. Though by the time I was thinking of just jerking off all over his goddamn face." He tugged on his crotch, cock clearly hard already by the obscene bulge, and then let out a strangled whimper, nearly a sob. "It fucking hurts. You gotta fuck me."

Sig looked pointedly at his window for a second, but then decided — fuck it. He'd gotten used to Jak's crazy little head doing whatever it wanted, and just leaving the rest of them to roll with it. "Sure," he said, and stripped off his shirt just as easily as he'd put it on, pointed to his bed. Jak was already stripped down to his underwear, another pair of ratty boxer-briefs — these ones black — and he only paused a fraction of a second before shoving them off and letting his monstrous cock loll out.

They'd fucked around some since that first time, nothing regular but frequently enough that Sig'd noticed Jak'd been out of town for a week. And every time they fucked it seemed like Jak's balls had gotten bigger: every time Sig forgot just how huge they were, big fist-sized things held taut under his oversized cock, all lopsided and heavy. But this time it might even be true: Jak's balls strained his sac to the limit, pulling the flesh taut and ironing out every wrinkle, and, in the process, revealing just how lumpy and fucked-up his balls really were, a mass of gnarled bulges and lumps themselves.

Jak sprawled across Sig's bed, cock flopping to the side in a thick, rubbery arch, still way too huge on his lean frame. But then he twisted over, showing his ass, and there was more. The root of his cock was just as big as the rest of it: an immense, thick bulge running down behind his balls, only finally being swallowed up by his ass cheeks, and now it was even more swollen, his taint bulging out in a thick hard swell, enough to really grab hold of. Hard to the touch, when Sig trailed his fingers over it, the muscle of Jak's cock grinding against some rock-hard internal swell. Jak moaned, going limp, and then in an instant arcs of eco energy played across his skin, burning it to a pallid white and giving Sig a stinging shock.

Sig whistled. "You really are pent up, hey cherry?"

He watched as Jak folded his hands, now with huge claws, over one of his pillows. Dark Jak coming out was inevitable when they fucked, but usually it took just about until Jak was coming, give or take a little stimulation. This was the first time it'd only taken a touch.

Jak just nodded, though, and let out an impatient little growl, shoving his ass back against Sig's hand. Well, far be it for him to leave Jak hanging.

It was easy to slip a finger and then two into Jak's ass, and then it became clear: his prostate, always giant, was at least twice, maybe three times, its usual size. It practically pinned his ass closed, its extra size bulging out over his taint and his ass, and it felt inflamed: burning up, implacably hard when Sig dug his fingers into it.

Jak started sobbing practically the instant Sig started touching it, hitching yowls that came out in Dark Jak's unmistakable register, his cock drooling black pre all over Sig's sheets. They were getting right into it, for sure.

"You want me to help you out here?" Sig slid his fingers around the inflamed bulge of Jak's prostate, thumb digging into the same swell through his taint. He pressed down harder, feeling for all the world like Jak really just did have a boulder lodged there between his hips. He could feel Jak's muscles spasm around it, trying to pump — milking out something, the thick tarry ooze that was dribbling from his cock — and failing.

Sig dug in harder, sliding his hand into Jak's ass to the wrist — still easy, even now — and dug in harder, grinding his palm down hard against the rocky swell. Something shifted and then cracked, and Jak let out a wail, audible sucking-gurgling noises coming from his prostate. Sig dug his fingers into it, feeling like he was trying to split an orange through its skin, slowly dislodging some bits of whatever dense blockage was crammed up in there. Jak sobbed, black tears staining Sig's pillow, and his cock shuddered — Sig could feel Jak push, hips and ass thrusting, cock flexing, as a sluggish spurt of chunky, gritty tar gushed from his cock, smearing opaque black slime up and down his belly as he rutted against the sheets, hands still digging into Sig's headboard.

He'd asked Jak, maybe their second time, why Jak couldn't just jerk his own damn self off instead of bucking and whining while Sig fucked him, and he'd splayed his hands, huge four-inch claws like gigantic knives attached to each finger. "Guess," he'd said, in Dark Jak's wheezing, choking voice, and, alright, Sig figured he could keep jerking him off.

He grabbed Jak's cock in his other hand and tugged it backwards, twisted behind his balls so it was sticking out, the black-flushed cockhead steadily drooling. His cockslit gaped, the underside of his cock bulging in lumps from clots of grit, and so Sig gingerly pushed it, milking from base to tip, pushing the clotted mess further up his cock until it spat out glassy black beads, all misshapen and lumpy: spreading his cock lips in a pout before the chunk burst out, dully clinking against each other as they piled up between Jak's calves.

Dark Eco, Sig found himself thinking, really fucks you up.

Sig found himself with one hand shoved up Jak's ass, grinding across the slowly-fracturing mess of gunk clogging his prostate, the other milking his cock, coaxing out the thick, congealed beads as they made they way down, forming a messy pile all soaked with opaque black pre all over his sheets.

Jak writhed and groaned, hips jerking forwards or back uselessly, sobs turning into little pained moans when particularly large chunks wound their way up his dick. And then one wedged in place, a huge gummy-edged chunk that only slowly and in spurts pumped up through Jak's abused urethra. It stuck just in his cockhead, swelling it even fatter, shallowly enough that Sig could see the glinting edge of it between Jak's gaping cocklips. So it seemed like there was nothing to do, but...

Sig slid his fingers through the tarry mess Jak had been gushing out, sliming his fingers evenly with the tainted eco goo. He tugged his hand from Jak's ass, using it to pin his cockhead in place, fingers and thumb pressing down on the edges of his cockslit just slightly, to make it pout out further. He rubbed a finger just over Jak's slit, all flushed and swollen already, and then... "I'm gonna stick a finger up your dick," he said, just to make it clear, and Jak just shuddered and nodded into his pillow. So he reached in there and fished it out — slimy finger butting against it and driving it deeper at first, until he slid his other hand up and pressed his urethra shut above the blockage, letting him squirm his finger up beside it, to finally push down behind and bring the chunk out, followed by an immense, slimy squirt of ooze that splattered all up Sig's chest. It wasn't made easier by how Jak kept squirming, his entire body jerking and writhing with each touch, broken moans and yelps coming out as Sig rooted around inside his cock.

Afterwards Jak's cockslit gaped, his too-tight foreskin opening basically directly into his cock with none of the rest of his cockhead visible, slit open wide enough to show off the pallid, grey-black flesh of his inner urethra, all sludgy and soaked with black pre. Tar bubbled up, only to ooze the final inch, winding its way down the inner curves of Jak's cockhead, squelching as it drooled into his foreskin.

Of course, right after that the chunks got bigger. Sig had to fish one after the other out, shoving a finger and then two into Jak's busted cock, while Jak just growled and sobbed and writhed around. He was probably coming all over himself, if Sig could tell his black come from the black pre — all he could tell was when his balls jerked, or when Jak gushed out a particularly strong blast of ooze and went limp for a minute; that was good because it meant Sig could focus on pulling out chunks of tar from his cock, instead of having to continually slap Jak's ass to get him to stop squirming for a second. And the mess of his prostate — Sig kept grinding his hand against it, from the inside or against his taint, and the mess kept fracturing apart, grinding cracks like rock breaking echoing through him.

"Don't think I'm gonna get anywhere at this rate," Sig said, half to himself — Jak responded, but it was with an incoherent warbling groan that only vaguely sounded like speech. He slid two fingers back and forth over Jak's gaping cockslit, dipping inside for a second, letting Jak's inner walls clamp down hard, pulsing and pumping against his fingers. Then he spread them, thumb massaging the outer bulge of his urethra, just slowly pumping two fingers back and forth into his cock, tugging him wider and wider until he could wedge his thumb in there too.

And look, Jak's cock was big; the biggest goddamn thing Sig had seen. But it wasn't the size of Sig's hand; with three fingers in there his cockhead was mostly just abused flesh wrapped tight around some fingers. But it turned out... Jak's asshole was stretchy as all get out, and Jak himself, especially as Dark Jak, could take a half-dozen electric prods to the chest and end up not a little bit worse for wear. Sig twisted his fingers around, watching Jak's cockhead shift with them, bulging out lopsided, rounding out his fingers into just an immense bulge.

Sig finger-fucked Jak's cock, practically ignoring the black tarry chunks save when they butted up against his fingers: just shoving three fingers back and forth, deeper, watching their bulge spill out from under his cockhead down into his shaft, back and forth, all slurping and slimy as Jak kept gushing out pre all over his hand. Sig spread his fingers, out and in, open and together, oily gunk building up between his fingers until when he pulled out there was a solid, slug-like glob all hanging between them, stretching slowly.

"You think you're ready for a little more?" he asked, notching his four fingers together, rubbing them back and forth over Jak's wrecked cock. Jak just groaned, shoulders shuddering. With Jak — there was a lot of shit Jak wasn't into, starting with cuddling and going down from there, but Sig hadn't yet found a thing that hurt that Jak wouldn't outright beg for more of. Still... Sig pushed inside, fingers shifting for space before he got them all far in enough that most of the pressure was on Jak's dick. Jak howled, letting out choking, heaving sobs, and his claws carved a fresh set of holes straight through the headboard as he clenched tighter.

Still, his cock took it.

"Well I'll be," Sig said, more than a little awed. He'd had the idea, but he hadn't thought it would really work. But here he was with his knuckles jammed inside Jak's cock, the thing now ludicrously distended, foreskin curled over half his cockhead, cockhead itself flushed an angry black. It was hardly even recognizably a cockhead: just a slope of flesh, taut slimy and bulging. Each pulse of pre gushed through his fingers, slapping his palm before drooling straight down onto the sheets.

After that his thumb was an anticlimax: he just brought it up along the underside of his palm and pushed it in, more than enough open space there already. And then that was that, and he had his entire fist lodged inside Jak's cock.

Well, that had been part one. Part two... he pushed deeper, gingerly, wet squirts of gritty black ooze erupting around his wrist. Jak inside was tight, much tighter than his ass, and each twitch of his cock clamped down hard on Sig's hand. Hard enough he was definitely gonna bruise; hopefully not hard enough to actually break any of his bones if he tried moving too fast. Jak's cock was a mess, veins all but crawling across his skin, pulsing continually from Jak's rapid heartbeat, and bloated two or three times its size, top-heavy from Sig's hand shoved halfway down his shaft. His foreskin was stretched out, the too-small thing apparently not quite as stretchy as the rest of his flesh: it dug over the crest of his cockhead, wedged in place at the thickest bit and making his flesh bulge out around it, showing off the inch strip of his bruised-black cockhead, pre burbling out around Sig's forearm and spilling across the grotesque, wormlike bulk of the rest of his cock.

Of course, then some heavy, chunky clots of ooze clattered against Sig's knuckles, and he had to open wide — watching from the outside as the motion bulged Jak's shaft even further — and grab them, and peel his entire hand out to toss the congealed black mass aside. Jak's cock hung there, still hard though how Sig couldn't fathom, not spurting but simply drooling, a winding river of black ooze spilling down the lumpy inner folds of his gaping, stretched-out cock.

"Don't worry," Sig said, tapping his sludgy fingers against Jak's still-bulging taint. "I'll be sure to keep going until you're all cleared out."

Jak must have been cognizant enough for that to hit, at least, since the warbling groan he made in response was all out of proportion to how Sig was touching him at that moment otherwise.

Shoving his fist back into Jak's cock was easier the second time. He wasn't looser precisely, but the flesh of his urethra stretched out a little easier. Sig twisted his wrist back and forth, easing deeper, Jak's cock clenching painfully around his fingers. It was just a matter of increments, shoving his hand minutely deeper, waiting for Jak's thrashing to die down a little, repeat. Sometimes having to start all over once a chunk of sludge got caught in the way, having to grab it and pull all the way out, and let Jak's cock drain a little — black ooze backing up past Sig's fist and then continually spilling out once he pulled free. He couldn't take too long though, or else Jak started getting antsy: he'd hunch back, grinding his cock against Sig's hand as if telling him to get back to work.

Sig worked his hand — more like 'arm' now — into Jak's dick all the way to the base, fingers actually reaching past where his shaft was anchored to his body. He dug against the bend in his tubes, and he had to pull Jak's dick straight out backwards, lined up so it was a straight shot all the way through: tip to base, through his taint, and then into the giant bulge of his inflamed prostate. He couldn't believe he was actually about to do this.

All lined up like that it was nearly from his fingers to his elbow: only that long and he'd have his fist shoved up inside Jak's prostate directly. He could feel his fingers through Jak's taint, the bulge behind his balls swelling and shifting as he ground his forearm down into Jak's brutalized cock. His cock... it hardly even looked like a cock now, just a mass of bloated, swollen flesh hanging from his body, completely slathered with gritty black ooze. Sig — and Jak too, apparently — was aware of the wet grind of his forearms, hair matted to his skin as he sunk himself deeper, his muscled forearms really breaking Jak's cock wider, cock just a series of clenching bands, most of which had given up and just gone slack. Just the wet grind of his hairy forearms was left, scraping back and forth over Jak's flushed cocklips as Sig tried to push the final inch or two forward.

The tight, spasming line of Jak's urethra opened up into dense, spongy flesh: his fingers dug into the inside of his prostate, catching on the mass of gunk clogging him up. He could only just-barely brush against it, and so he pushed in just a little more, bearing down against Jak's busted cockhead with the full girth of his forearm, spreading him open a fraction further. At this point Jak was mostly just shuddering, sobs having turned into choked, rasping heaves, but still that got a cracked whine out of him, something sounding more like a feral animal than anything human.

Sig grabbed at the mass, using his hand in Jak's ass to push down against the rear wall, forcing part of the shattered mass forward into his other hand. Sig grabbed ahold, fingers sinking into the gummy, gritty sludge thickly coating the spar, and tugged hard enough to snap it, a crack like glass breaking sounding as a fat chunk of it broke off in his hand. Jak wailed and went limp, nearly pitching forward into the headboard, panting raggedly.

It wasn't much, but Sig could feel Jak's prostate grind and clench, the mess remaining repositioning itself tighter and denser now that he'd gotten some part of the blockage out, rocky plates grinding against each other and their vibration buzzing up through Jak's body.

Sig tugged backwards, bringing the chunk with him, fingers slipping against its slimy surface as he wrestled with it, peeling the huge chunk of it back out, surfacing into Jak's shaft and tugging all the way up until Jak's abused cock finally spit his arm out and the chunk with it.

Sig had to admit, he was curious just what the fuck it was up in there, aside from a week's worth (only a week?) of built-up pre. The chunk was a lopsided mess longer than it was wide, not too much smaller than Sig's fist, and all coated in greasy, gritty slop. Sig smeared a finger along it, the actual surface more like sandstone, dissolving down to a harder core as Sig kept working it. And then:

"This is an Eco crystal," he said, more than a little dumbfounded. "Holy shit." These were the things at the core of every Peacemaker slug he had, and also used in most power plants. The grain was all messed up, presumably since this one had been formed in a week inside a guy's prostate, instead of grown from a seed in an eco harmonic pool over a few months. But still, damn, it looked like the kid just about came money.

Well, looking down at Jak's dick, gaped open and oozing black tar, if you could call it 'coming'. He slid fingers back into Jak's ass, bearing down, hearing the crystal break apart into further chunks. There was plenty more where that came from. He shoved his fist back inside, and again, and again, and again.

The motion was almost routine by the tenth time he did it: dig in, all the way into Jak's inflamed prostate; use his other hand to smear the fragments around, shoving one close to his hand; then tug off a shard and pull it out. Again and again, throughly busting Jak's tubes open, piling up grimy eco crystals in between his spread legs. One after the other, grabbing ahold of a solid, heated mass of gritty, gummy crystal and then steadily, slowly dragging backwards out through Jak's convulsing cock, each time punctuated by a spray of chunky black come, spurting down across Sig's stomach or down all over his incredibly ruined sheets.

Even after the main mass was out, no more shards left to crack apart into fist-sized chunks, there was still so much more: Jak's prostate was swollen into folds, and Sig felt across its convolved walls, a maze of dense flesh. He kept spreading two pinched-together folds only to have a fat, fist-sized crystal spurt out, all but smacking itself into his palm. Sig could feel Jak's prostate shrink, flesh bunching together again instead of stretched out around enormous crystalline chunks. It became lopsided, the remaining crystals all thick hard knobs lurching out from the dense, spongy flesh, all waiting for Sig to thread his way through its mazy passages and tease them out.

Also, Jak's pre started to lighten, going from gritty opaque black to a more syrupy translucent purple, what passed for regular for him. Really that only showed him how often Jak was coming all over himself. Every single time he'd pull out, Jak would wail and a mess of tarry black ooze would erupt from his gaped cock, and now he could see that that really was come, Jak's balls pumping eco-corrupted sludge out of them in frothing black cords, crackling in minute arcs. Oh, hah, and Sig nearly lost his rhythm at the realization: Jak usually came black eco in a big electric crackling mess, and he hadn't until now because the eco crystals had been sucking up all the charge. It was cute. He'd never expected to find, like, Eco Physics 101 useful in the bedroom.

Sig might've let himself get a little distracted: bearing down against Jak's prostate from his ass, the hand inside his cock just slopping back and forth through the opening into his prostate. Sig dug through the bruised, stretched folds of Jak's prostate, pressing his hands together with a thick rubbery wall of flesh between them, and just rubbed up and down, grinning as Jak wailed and came, a sloppy, frothing mess of mostly-pre-and-come spurted out around his forearm, the gummy grit slowly thinning as Jak's over-productive prostate started working properly again. Looking at a thick, gummy cord of purplish pre hanging from his elbow, fat and jiggling... well, 'working properly' as far as Jak was concerned.

But after a while Jak started to really flag, go nearly insensate, and after all there was only so much even an eco-reinforced mutant could be expected to withstand... and, honestly, Sig would've thought he was pushing his luck at two fingers, much less his entire arm to the elbow.

Plus his arm started to hurt. There was only so long he could fist-fuck somebody, too.

It was almost... perfunctory, fishing out the final few clots, and then digging harder into the pulpy mess of his prostate to see if there were any more. Finally he pulled out, hand empty save for a bunch of ooze threaded through with black grit, and slapped Jak's ass, uncaring at the splatter. They and the bed were already soaked. "Think we might be done here."

Jak wavered for a few seconds, probably not up to parsing language after having his cock fisted for a good hour, and then once it hit him he just warbled out an exhausted groan and collapsed, body hitting the sheets with a wet smack. Sig didn't blame him.

But, man. Jak was a mess; there were smears of ooze over nearly every inch of his skin, chunks of dark eco crystal piled up between his legs. His cock, no longer hard but not any smaller for it, was flushed a brilliant black-purple and swollen enormously, nearly looking like Sig still had his arm shoved it inside it. His gaped cockslit was still drooling, the gritty dregs of the mess he'd had clogging up his prostate, just little fingernail-sized globs mixed in with a thinner slurry, cloudy purple-black pre finally washing out what little remained of the backed-up clots.

Sig hadn't even touched his own cock this whole time. He hadn't even gotten off his pants. His cock had dripped a wet splotch on the crotch, hard this entire time, and now he reached down with hands all slimy with dark eco come and just let his dick out, tugged himself a little, stroking slow, other hand smearing up his muscled belly and then pinching loosely on a nipple. It wasn't gonna take long at all; in under a minute he was shooting his load all up Jak's back, just from the view.

Sig looked down at himself, all slimy and coated in oily smears of eco, his stroking hand having smeared his pubes down with black sludge. He was gonna have to take another shower.

---

Anyway, Jak was out like a light and Sig didn't blame him one bit, so he just sucked it up and slept on the edge of the oily black splotch and just, really resigned himself to going through sheets and mattresses like once per time he and Jak fucked.

In the morning, though, Jak was still Dark Jak, which sure was a thing to wake up next to. Jak yawned, sharp dagger teeth on display until his jaw snapped shut, and then he tugged the corner of sheet draped of his crotch aside. "Look what you did to my dick," he said, and look, on the list of things wrong with that boy's dick Sig wasn't anywhere near the top.

But his dick sure was fucked up. His shaft looked like a figure-eight, the bulge of his urethra down the underside the same size as the rest of his cock. It was all bruised and swollen up immensely, thin threadlike black veins branching under the surface, flushing his urethra a dark grey. The bulge went all the way back, behind his balls, easily leaving his taint more swollen now than when he'd come in yesterday.

Sig hummed. "You did ask, kid; don't blame me for what happened."

Jak let out a rasping bark of a laugh and raised one leg, gingerly reaching down with his clawed hands to tug his huge, lopsided balls out of the way, showing off the heavy, puffy swell of his asshole, flexing and gaping. "How about you make sure you got all of it," he said, voice attenuating to a strained rasp by the end; Dark Jak's vocal cords were really not made for talking. "then," Jak said, throat straining, and he had to just breathe for a second, making a face. "Fuck me."

Now it was Sig's turn to laugh, grinning as he stroked up Jak's thigh, other hand wrapped around his half-hard cock, letting it grow in his hand. "I'll see what I can do." And then, the movement rattling the pile of eco crystals he'd left on the bed, "So how d'you feel about waiting another week to get off after this? Turns out getting you all pent up is valuable."