This is for the LOST contest and I'm paired against Jedi. The theme is post-apocalyptic - good luck!
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Every night, we would huddle underneath the ruins of our home, where my father's basement was. Before this... this nightmare had occurred, he'd used it for experiments - and they weren't the pleasant kinds. My mother was forced to invite the homeless inside, feed them to the brim that they'd swell like a balloon. Then my father would usher them down the steps to his dungeon, chaining the victims and injecting them with slime green liquid. Despite having a bedroom three floors up, I could still manage to hear the barely audible agony screams of my father's toys. He was transforming them into mutants, mutants that would soon overpopulate the human race due to foolish scientists and be the source of the world's destruction. 

Little was my father aware that his acts of beyond cruelty would be the spark that forced us all into hiding.
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He let out an abnormal grunt as his diseased arm came into contact on the screaming skull. Dead flab hung off his body, boils and warts squeezing with pus dotted all around; he wore a stained labcoat and his greased dark hair stuck up in tufts, bald patches caused from others of his kind. They were always getting into conflicts, sucking their souls out as well as chewing on their organs. It was the only way that they could survive without discovering any of their primary food - the humans. Several years ago, the insanity that corrupted humanity destroyed the world, with around 90% of the population extinct. Only those who excelled in the sciences maintained themselves to be alive, along with their families. However - it wasn't all fun and games; the majority of living things that now explored the planet were those derived of the human species - the scientists' mutants. They fed on a diet similar to cannibalistic homosapiens, which also caused the human population to decrease. Only an estimate of several thousand, perhaps even hundreds, humans were spread around the wreckage of the world. 

As the final whimper erupted from the crumpled body's mouth, a thin thread of blood lazily trickled down its chin. He immediately dug his filthy nails into the delicate flesh, tearing it apart as easily as possible. In only a number of minutes, he had completed his meal for the day. A lone but large home stood a few yards away from his peripheral vision, the mossy bricks crumbling like dust. A faded black door leaned ajar, emptying itself into the blinding darkness. He breathed heavily as with all of his effort, forced himself upright and staggered slowly towards it - his large, flabby belly fluttering almost peacefully in the breeze. Sand that had travelled from the water nearby flew over the dirtied path, almost colliding with his face. As he passed the blurred window, a distorted image popped into it. An obese 'creature' gazed back at him, its face full of flab and disease, its eyes barely viewable (they were simply small black ovals), its nose was barely a piece of flesh that hung from his face and multiple chins accessorised with blistering spots completed the appearance. He shuddered with horror, hoping that this thing couldn't see him as he made his way to the door. Due to his advanced sight, he was able to survey the darkened room with ease - a couple of wooden chairs were thrown to the side of the room, and a television was in pieces on the floor. Everything seemed to be broken, with only a small photo on the wall unscathed. He decided he would stare at it later, for suddenly a mouthwatering scent had made his nostrils flare. Despite having already eaten, he moaned in pleasure and dragged his way down the stairs towards it.

Initially, his first thought was of hunger as he predicted that around three HUMANS were inside the room. Why, humans around here were as rare as the dodo bird. He hurriedly barelled himself inside, throwing his entire weight onto the weak door. It compelled to his wishes and smashed onto the floor. Gaping back at him was a thin woman and two bony children. They all let out shrieks of horror, their eyes wide with an unimaginable fear as they scrambled against the wall. He lunged for the woman first, his chubby hands grasping her neck and bending it as quick as that. She sagged in his arms, her eyes frozen in terror. He threw her body to the concrete ground with a thump, circling his last two victims. He threw himself successfully at the closest one - the girl, and within the action of the impact, he stabbed his hands through her body. She was dead within seconds. As he raised his head, the last of his prey was against the wall, sobbing. As he quickly drained the boy's life out of him, he heard the word that the victim muttered.

"Daddy."
-
After finishing his enormous meal, he stumbled back up the stairs and towards the exit, his large belly full. Droplets of blood stained his labcoat and he wiped a large finger across his mouth. Something suddenly caught his gaze, and his eyes fell back on the familiar photo. Stumbling towards it, he gazed at it and his lips curved downwards. On the photo was a family of four - three of them had been the ones downstairs. And the last one, the man, wore a labcoat, his smile never reaching his eyes.