So, uh, I guess a little disclaimer's in order here?
Yeah.
I'm not a lipless cartoon with a cool green shirt, or the life-sized version of. Homestuck is not my creation, and neither are these characters. Perhaps not even the way they're portrayed, though I do try my best... Keep in mind that most of their personalities are made up of headcanons and bullshit psychological stuff. I went just a little Rose on 'em, especially Karkat.
The cover isn't a work of my own, either. It's "Trouble Sleeping" by QueenHakamorra on Deviantart.
Now, read on, my lovelies.
Read on and hopefully do not hate it too much. c:

It was everywhere.
That was all she could think, really... that it was simply everywhere. It was in her nose, metallic and sickly. It was in her eyes, olive green and quickly overwhelming everything else. And it was in her, simply in her, masking everything else she could feel. That was, aside from the hazy fog in her mind that seemed to be slowly trying to smother a sharp, burning pain in her shoulder and just above her right hip.
But now the green was fading, fading into blackness... And through the haze pushed a single thought, dim and frantic. She was injured, and she needed help. Saving. There was a hive nearby, she knew... just out of the woods. It was in the center of a large grassy field, and it was the closest to her, and that was all she knew at that moment.
With breaths shallow and quick, Nepeta slowly rose to her feet and pushed through haze and pain and forest foliage to find what had to be her best hope at help and life. When she finally fell again, it was into lush grass, and before her was the dark shape of a hive, just barely visible to her through blurry vision and the quickly approaching nightfall. And then it was gone... And so was she. She was in her own head, now, the dark nothingness of unconsciousness.

Karkat sat hunched over his husktop, his fingers dancing almost angrily over the keys. Everything about him seemed angry, really... his posture, the sharp and precise movements of his hands, even his expression was twisted up in what looked to be a permanent scowl. But this, of course, was nothing new. This was Karkat, this was how he spent his every waking hour, and... well, he liked it this way. He liked knowing what was going on at all times, and he liked the distraction that the husktop provided from his mind. It was one of the reasons he slept so little, really... Sleeping required him to pull himself away from his connection to the rest of the world. And then things happened without him, and he was forced to figure out those things from others. But then details were left out, and... Well, he just didn't like it. And of course there were other reasons, but none irritated him so much as that one.
But of course he had to sleep at some point, and that time jut so happened to be then. It was late anyways, and he was tired, and he was fairly certain he hadn't slept since at least two nights before... perhaps longer. He never really bothered to kept track.
So the last letter was typed, the last message sent, and the husktop powered off and closed. Karkat sighed and then stretched as he leaned back in his pile, then shoved his husktop aside and stood at last. His fingers curled around the back of his neck before sliding away, and with another heavy sigh, he turned and began the walk to the stairs at the far end of his luxuryblock. He stopped at the foot of them, though, and craned his aching neck to squint out at the bright moons that dimly illuminated the starry sky, as was routine. Their mixed green and purple cast a strange sort of light onto the small bit of world he could see from his side of the four-paned window, and along with it came an eerie, almost... creepy kind of feeling. Like something wasn't right.
But that was normal. That was how the night always looked, how it always felt... Sort of. Generally, the moons were at least a partially obscured by some kind of fog, or clouds, or something of the like. But tonight was completely clear, completely dark, and... Well, it felt different somehow from most nights.
No, fuck that. It wasn't the moons. It couldn't be.
The familiar shapes and colors of the moons never made him feel so off as he did now, as the whole scene did now. That wasn't it.
Karkat squinted further and moved forward, a frown creasing his lips. That was it. And what the hell was it doing there? That little lump out there... It remained too far away for him to see correctly, but it looked sort of... green. Or was that the glow of the larger, greener moon?
No... the shade wasn't right. And besides, the purple threw it off a little... The lump wasn't the right color to be grass, either. And it appeared sort of flat, not quite the right flat to be a rock, or...
Oh.
Oh.
It was a troll.
It had to be, it only made sense. It was about the right size and shape, judging from how far away it seemed to be, but... But the question still remained. What the hell was it doing there? And laying down, no less. This wasn't it's place to be, and it certainly wasn't... well, normal. The position was too exposed for any normal troll to be comfortable with, and the place... Karkat was alone out here, he always had been. His friends were strictly online, and no other living being had any business being out here. Not until he was far older, or until he was actually, seriously in a quadrant. Though even under those conditions, his friends rarely visited each other.
Of course, they all knew where each other's hives were, partially because of past dealings, and partially because of past, wriggler-like curiosity. So maybe it was one of his friends, who had decided upon a spontaneous visit? Or perhaps it was something else... Whatever it was, there was really only one way to find out. And as much as he hated the idea, he was going to have to sooner or later. It was far better than letting the mystery sit and bother him, anyways. If there was one thing Karkat couldn't stand, it was not knowing something.
So he wrapped his fingers around his arms and folded them tightly over his chest, and then he was outside, trekking across the dewy lawn in pursuit of the stranger that resided there.
"Hey!" He called harshly when he was certain that the other was close enough to hear him. "What the hell are you doing out here?! Is something seriously fucking wrong with your head?! You'll hurt yourself, you know! Hey! I'm talking to you!" Karkat quickened his pace, and his grip around his thin arms tightened. Why wasn't the moronic shitface answering him?! They weren't even moving, they were just laying there, as if they were de-
Oh.
Oh god.
That was... Blood. Everywhere. Olive green and sticky and... everywhere. What had even happened to cause so much blood? And how had they gotten- Oh dear, never mind how they got there. Karkat knew who that was. That shade of green, it was too familiar. He knew what that was, he knew who, too, and it made him want to be sick. Because it had to be her, the happy-go-lucky self-named 'furocious purrtedor'. The shade was exactly her's, and those lips that stuck up in the middle and just a bit at the ends to just barely resemble the mouth of a cat, it was all too perfect. Or rather, purrfect, though the joke didn't much help Karkat's churning stomach.
This was Nepeta.