Ok here it is, the fan fiction I've been working on lately. It's not finished, but it's turning out to be pretty big so I'm just going to start posting what I've got and add new chapters as I write them. Of course, helpful feedback is always appreciated. 
I'm not surewhat the text limit is for a single post, so I may have to make several posts to get them all in, sorry for that - I'm not trying to hammer the site or anything. Also, it does have some strong language and graphic descriptions, so please be forewarned (though since it is Dead Space, I don't think anyone here will really mind). Anyway, enjoy!
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Chapter 1
"I love you, Isaac. I've always loved you."
The soft, iridescent glow of the holomonitor bathed the cabin in its eerie blue light as Isaac watched Nicole's final message for the last time. He had seen it so many times before, but now that he had personally witnessed the inevitable outcome of her actions and finally accepted the fact that there was no hope in ever seeing her again, her haunting words now only seemed to reflect his own intense sorrow and became far too much to bear. Unable to watch it any further, Isaac lowered his head and pressed the the 'delete' key. As the grim imagery flickered off the screen and the panel faded off, he once again became blanketed in the infinite blackness of space, with only the stars twinkling in the distance to light his way.
"Nicole... oh, Nicole..."
Inside he was devastated, but still caught in the grip of fear and shock of the scenario he had just barely escaped, he found himself unable to outwardly grieve. He could only sink limply into the pilot's seat, staring disconcertingly out into space, barely breathing. He sat motionless in the deathly silence that surrounded him for a length of time before he became distracted by a quiet scratching sound coming from the back of the cabin. Perturbed, he turned around to see what it was - and without warning was tackled by a necromorph, apparently having managed to escape aboard the vessel with him.
Isaac instinctively jumped to his feet and grappled the vicious creature, trying to force it to the floor. He panicked as he realized he had already removed his helmet, and was now dangerously vulnerable to the necromorph's flailing attacks. In the chaos that ensued, he failed to find his plasma cutter and resigned himself to attempting to kill it with his bare hands. The cabin was nearly pitch black, and he was unable to determine what sort of necromorph it was - was it a Lurker? Would he eventually feel the lethal injection of its spear-tipped tentacles lodged deep into his backside? Would he be decapitated by the razor sharp barbs of a Slasher? Or was it something worse?
Terrified, Isaac gripped the monster by it's disfigured throat and slammed it into the controls, damaging the panel and causing several onboard warning alarms to sound throughout the cabin. He felt the necromorph wrap itself around him and the two toppled to the floor. Isaac tried desperately to wrestle the creature beneath him and immobilize it with his weight, but the creature proved to be far more powerful than he expected, and his strength was waning quickly. He could feel its slimy, mutated hands gripping around him, drawing him closer to its stinking, gaping maw and though he resisted with all his might, Isaac sensed that he was losing. The muscles in his arms, strained and overworked, began to quiver uncontrollably against the force, and he could hear the necromorph's gagging groans getting closer to his ears. The harder he tried to get free, the more the beast tightened its grip, wrapping itself around him like a snake, slowly squeezing the life and resolve out of him.
Just when it seemed he could stand no more and was about to give in, Isaac's left arm gave way beneath him and he rolled to the side, momentarily freeing himself. Out of the corner of his eye he saw his one chance for survival - a nearby protruding panel had been knocked out of place by the tussle, and it's thin sharp edge gave him an idea. As the necromorph regained ground and lunged at him, he deftly grabbed it by the torso, rolled over with it and slammed it into the panel's edge. The gelatinous, decomposing flesh of the necromorph's shoulder gave way easily, impaling it in place. This caused the creature to emit a deafening shriek that sounded eerily human.
As the immobilized necromorph writhed in pain and tried to break free of it's predicament, it released it's grip on Isaac and he quickly dragged himself to safety on the other side of the cabin. Exhausted, heart racing, Isaac searched all around until he finally managed to locate his cutter. He quickly loaded it, took aim at the necromorph and with a shaking wrist, pulled the trigger and fired. Again the creature emitted a humanistic scream of agony, and it took Isaac a long moment before he came to a horrifying realization - he recognized the voice coming from the necromorph.
"No..."
Frozen with apprehension, he just stared into the dark towards the monster dangling from the steel panel, now bereft of it's right arm and bleeding profusely as a result of Isaac's shot. After a few minutes, it finally stopped screaming and was now just quietly whimpering in agony. Isaac reached up to the sparking control deck and activated the interior cabin lights. As the entire room illuminated, he became sickened and horrified as he could now plainly see who the creature once was.
It was Nicole.
Isaac, stunned, just stared at the bloody abomination across from him, not knowing what he was going to do. Having realized who it was, he no longer had the desire to destroy it, but understood that he could not allow it to live. He was confounded. Against his better judgment, he slowly made his way across the floor on his knees towards the mangled creature, it's weakening condition becoming apparent as it movements became more and more sluggish. Mortified and heartbroken, he focused on the remains of Nicole's face rather than it's deadly, mutated appendage, reached up and gently cupped her head with his hands. In a broken voice he pleaded to the creature, refusing more and more to recognize it's malevolent nature, as it lay gagging and hanging limp from the panel that immobilized it.
"Nicole... why...? Why did you do it? If you would have waited for me..."
He looked deep into her eyes, which were now deep, black pits of decomposed flesh, and slowly, gently touched his forehead to hers. It was all he could do, to hope against hope that Nicole wasn't actually dead; that somehow, somewhere deep down inside the poor, twisted, ravaged creature before him was some small shred, one tiny remnant left of the woman he had loved. The distorted figure began to shake convulsively as blood poured profusely from its severed limb, pooling out across the cabin floor with thick, black tar like viscosity. But Isaac, guilt-stricken, hardly noticed. All he could see was Nicole, writing in agony before him as a result of his own actions. He leaned forward, gently removed the necromorph from off the panel, and holding her in his lap, gently kissed the side of what was once her cheek. In his delusion he didn't feel the charred, blackened flesh on his lips; he only felt the soft, supple skin as he remembered it, burned forever into his memory. As he held her in his embrace, he gently wiped the blood and matted hair from around her face, rocking her back and forth. He could feel the creature's remaining arm touch him, slowly hugging around him in what he imagined was an anemic attempt to reciprocate the affection he felt for her. Gradually, his heart rate slowed, his muscles relaxed and a calm serenity came over him. Caught in the moment of some beautiful memory, Isaac closed his eyes and smiled within himself, glad that he could at least be with her during her final moments as he had always hoped.
It took him a minute before he came to a growing awareness of a warm, metallic taste becoming prominent on the tip of his tongue. All of a sudden, he found his mouth was filled with blood, quickly followed by a sharp, excruciating pain sliding into his belly from the front to the back. Alarmed, he opened his eyes and saw the sad, mournful gaze was now lost from Nicole's eyes, hastily replaced with intense, growing fury. Her face darkened, her eyes began to glow a deep, dark red. Isaac then looked down to see why he was feeling such terrible pain, and saw the long, spear like talon of her remaining arm buried deep within his abdomen. A cold, tingling sensation across the small of his back suggested that it had emerged through the other side. Unable to speak through the blood, he just mouthed the words.
"What.... what are you doing?"
The necromorph, with returned strength, rapidly withdrew its arm, leaving Isaac wavering briefly on his knees. A large hole, several inches in diameter, now extended all the way through the lower portion of his body, clear enough to see through from one side to the other before it began to expel massive amounts of blood and internal organs. With the flesh, bone and muscle now completely removed, Isaac was no longer able to support his weight, and he toppled over backwards onto the floor. His vision began to dim, but he could almost make out the necromorph as it managed to climb up onto his chest with its one good arm. It stared hard into his quickly dilating eyes for a moment before it's jaw split in two and pushed outward, revealing countless rows of serrated fangs. The creature reared up in preparation to feast, and with his last conscious thought Isaac simply whispered voicelessly through bloodied lips.
"I'm glad it's you."