This is one of my first shots at fanfiction, so constructive criticism is always appreciated!
Seviper looked up. The sky was so clear, unlike the tall grass below it. Seviper and Zangoose were scattered everywhere, some dead, some alive. It was a battle to the end- one that she couldn't take part in.
Somehow it felt like a betrayal to hide in safety while her parents were raked by savage claws on that distant battlefield. Though, her exclusion from the clash was simply because her level was too low to be of use, so despite Seviper's uneasy feelings she was grudgingly grateful for that safety. Yet... the group of mongoose-like Pokemon had a gleeful light in their eyes. They were winning. Every snake in the valley was outnumbered two to one.
Seviper couldn't take any more. She closed her eyes. Maybe it was a dream? No, it wasn't. A Zangoose who had strayed from the crowd ran past her, claws wet with both the evidence of the failed poison attack and- she closed her eyes. Of course blood was natural in battle, but the thought of it being on her worst enemy's evil claws was sickening beyond all recognition.
Just as a snake's luck would have it, the Zangoose noticed the slight movement, and saw the helpless Seviper trapped between two tree stumps, a gesture that was supposed to save her life. He inched closer, the thought of an easy win seeming to sharpen his claws. The helpless reptile thrashed about, entirely unable to reach out just a few feet and deliver a savage wound. The scarred mammal standing imperiously in front of her just laughed roughly at her weakness, raising his claws up in a deadly and gloating manner. The snake looked at the background, preparing for the final slash that would end her so early. Or would it? Her friends and family were fighting savagely, so why couldn't she? Seviper resolved to keep striking with any means until her eminent doom, both through words, and by physical use if she could just lure the Pokemon in front of her a few inches closer....
"You don't wan't to do this!" The Zangoose's demeanor of pure relish vanished in an instant. It was obvious that these Pokemon did not appreciate being told what to do on any level. He spat at her with more venom than any Seviper could ever hold, "Don't tell me what to do! Give me one good reason why I shouldn't kill you, and I'll make sure you go quickly and painlessly, unlike the rest."
"M-My family will get to you and tear you apart!"
The mongoose sighed, replying in a flaunting, uninterested manner. "Guess what? Most of you serpents are on the ground, dead. Corpses don't attack as far as I know, so I don't think I have anything to be worried about."
"I... don't... care!"
The Poison-type suddenly redoubled her struggles, only restoring the smile on the twisted Zangoose's face. He had a sudden strike of inspiration.
"Here- let me help." he said before lunging at her chest. The sick shadow of a Pokemon raked his claws down her scales, all too easily slicing through. Seviper felt blood dripping down her chest, accompanied by searing pain and the hearty chuckles of the killer she'd grown to loath with a frosty passion.
Her first scar. Zangoose stepped back again, admiring his work. "There. At least now you'll die with a Seviper's stupid trademark cut down your throat. Now, back to your real reason. Why shouldn't I kill you?" He barely inched towards her, possibly preparing for another strike if he didn't like her negotiating- but this snake wouldn't stand for that again if she could help it.
Riding on a burst of adrenaline and primal instinct, the venomous snake found the strength to wrap what little she could then use of her tail around the foul mammal. He was not expecting this abrupt stunt, of course, and could do nothing as the harsh tables of battle were turned. The choking mongoose struggled, though his efforts were futile. Seviper continued to exert more and more pressure onto the smaller body, slowly squeezing the life out of the abhorrent Zangoose like an almost empty tube of toothpaste.
"Okay!" he gasped in a strangled whisper. "If you let me go, I'll help you....I promise...." This took Seviper aback and a small Wurmple of doubt began to form in the back of her mind.
"Let me go!" the Pokemon was getting weaker.... The heavily fanged snake realized with a jolt that she hadn't stopped asphyxiating him. Though, she didn't want to kill, as much as she loathed the creature that she held in her coils much like a Vanillish would loathe ice-cream trucks.
"Fine!" Seviper set Zangoose free right where she could strike again, but not before harshly tightening her coils just one more time to snap his claws.