warning: it's a rushed, impromtu zadr smuty/fluff fic so ye have been warned

Despite what almost everyone in the universe thought, Irkens weren't incapable of sex. Yes, they'd deemed it mostly un-necessary and were even taught fairly young that it wasn't something they should do. It invited useless emotions and sensations but, the taller irkens, the richer and the more curious ones had no problem experimenting. But, the ones under 16 ligas were too busy yanno, dying or serving the empire to think about sex much less have it.

And since Zim was about 14 ligas and kind of an asshat no one wanted to experiment with him. And he'd never even paid attention in class the day it was taught. But, humans were much more…blatant about it. Some considered it shameful or sacred. Others treated it like it was a good time, something casual. But, despite the slight curiosity Zim could've cared less and was slightly repulsed by the whole subject.

Or at least he had been. But, that was several years ago.

Dib frantically removed his shirt, throwing it to the side, somewhere, wherever, and planted another powerful kiss on Zim that left his knees shaking. The irken was loathe to let the human escape again, even to remove another item of clothing and desperately tried to keep contact, to keep the sensations.

Dib breathed a laugh, used to Zim's almost needy enjoyment of the kisses. It was like he was addicted. The human let it go on for a couple minutes; breathing into each other, lips parting and colliding, a slip of the tongue here, a nip that almost cut skin here and he could hear his heart beat in his ears.

Zim would be more than happy to just let the kissing happen, over and over and over for a million years (or for however long it took to destroy the earth) but, then Dib pulled away. The irken whimpered a bit pathetically. It transformed into a breathy huff when the human removed his tunic and undershirt. So impatient today. Understandable though. It'd been nearly a week since things had gotten them mad enough to do this.

Zim panted and ran his hands over the human's bare chest, noting the various scars and freckles. They told such stories. Dib's chest held the history of his life on it, the hours spent in the sun, the injuries sustained fighting him. The human reached around and grabbed the irken's rump and pulled them together so they rubbed in all the right places. So, Zim could feel just how angry the Dib was. A moan escaped from both of them. The kissing started again, with more rigor. Zim hissed and clawed at his mate's skull, grabbing him to keep him near to fuse their mouths together. And every time they parted even a breaths away he wanted more, needed more of that stupid taste, those horrid lips.

Mindlessly they rutted against each other until someone got the bright idea (probably Dib) to rid themselves of their trousers. Kicked them away, basked in skin against skin. The paranormal investigator slid his hands down till they were under Zim's knees and he lifted the irken, backing them both up until they hit a wall.

Dib pulled away to bite and suck at the alien's neck and said alien whined and whimpered, forgetting his pride and his superiority, as blunt teeth toyed with his collar bone. He felt them, felt their bodies so close together, slick and eager. So close and the Dib was toying with him. His toes curled and he blurrily scolded his lover. Hurry up! Patience, idiot. Don't call me that. But, it's true.

The argued during sex. What else would they do? Scream?

Finally, they were connected. Dib slid inside the irken, listening for that –hitch- in Zim's breath as he did so. The irken complied without knowing and it sent waves of satisfaction down the investigator's spine.

They fucked. It was raw. It was nails digging into skin and beads of sweat. Between curse words and shouts of mercy towards higher powers, it was mind numbing, multi-color inducing sex. It was familiar to Zim, now. Something they did well together besides fighting and destroying their mutual enemies. The wall shook and so did the very foundation of their relationship.

Zim lost himself in sensations and that was terrifying and liberating. He would never know that that was why the taller irkens did it, why even though sex wasn't necessary anymore it was still done. It was something besides anger, something that the pak could not regulate.

Dib loved to listen to the noises his irken made, every squeak and hiss though near the end all he could hear was his own heart in his ears. They didn't come together but it was pretty damn close. The irken came first, shaking violently and feeling the universe tear into a thousand pieces as he reached between them and pumped himself (the only time he ever touched himself). Those pieces remained fluttering into emptiness as his human reached his own climax, pressing his face into Zim's shoulder to muffle his throaty cries.

The pieces of the universe settled as Dib lowered them to the ground of…Zim's base, yes of course. The laboratory, where they spent most of their time. The floor was cold. The Dib pulled away and shakily leaned against the wall next to the irken, breathing finally settling.

Zim's own breath rose and fell in time to the beating of his spooch. He glanced over at the male who stared out at nothing, flushed and covered in teeth marks. The pieces of the universe had settled into this; into Zim scooting closer, just a little bit, towards Dib so that the cold wasn't so bad. He remembered the first time they had done this.

Awkward and rushed. It'd been like pulling the pin on a grenade, but watching it in slow motion. It'd been over in ten minutes but, they did everything deliberately. Zim wanted it. Dib wanted it. And they'd fucked in the human's bedroom not once, but twice. Then they'd spent another two hours talking about it and then arguing and Zim had stormed out, forgetting his gloves.

He'd been curious and though the idea had been abhorrent to Zim (videos didn't help) there'd been a heat burning in his system that arose every time the human was near. Who better to experiment on than the Dib? Who had been hesitant but knew something that the alien didn't (that they were far beyond enemies, slipping past the point of friends and he'd been having the most fucked up dreams).

It was an agreement of sorts, one that wasn't really spoken of. But, it just happened. Like a ticking time bomb. Inevitable with no defusing it.

Zim stretched and gave up, flopping onto the human's body, who in return wrapped a single arm around the alien's waist. The action sent a kind of noxious flutter up into Zim's chest. He smiled and touched Dib's arm, sliding a finger up his wrist and across to his elbow, noting the little birthmark and blue veins that slowly dissipated into the mist of fair skin.

The smile faded as he touched a scar and remembered putting it there with these same claws that now caressed the spot. It wasn't that Zim regretted doing it; they'd been enemies then and it had been a life or death situation. But, somehow the burst of smug satisfaction from its presence was drowned in appreciation for the tiny freckle on Dib's wrist bone.

That was bad. That was something that needed thinking about. He needed to consider the possibility that this whole sex thing had gone too far, corrupted him to human passion and, and…The Dib pressed his lips against the top of Zim's head, between his antenna, gently parting his lips. It was like a kiss but, wasn't.

That wasn't fair. This was horrible. He needed to think, to get away from Dib and figure out when fucking turned to…something more? Zim turned around to tell the human that the boy needed to get out of his base but, then he fell right into the bliss of amber eyes, stained a thousand different colors. He'd seen those eyes on rainy days, sunny days, with snowflakes stuck on the eyelashes, when they were dark with rage and passion or wet with unwilling tears. He'd seen them blood shot from lack of sleep and dancing with joy or mischief. He saw them now and they were soft with some un-nameable emotion that he'd yet to discern but, he would.

Zim would.