Disclaimer: Inuyasha is the property of Rumiko Takahashi. However, the story concept is entirely mine, as are a few characters.
70 years later...
Shijira paused on top of the grassy hill that overlooked a small village. She sniffed the air, her upper lip curling into a disgusted sneer. Filthy humans. Did they never bathe? From the different scents she could tell there were only around twenty able-bodied men inhabiting the village. The rest of the village was comprised of women, children, and the useless elderly.
She remembered this village well. After her family's death, she had wandered from human village to human village, living on the outskirts and scavenging their leftovers. Occasionally, if she were lucky enough, she would kill a baby cow or sheep. Those had been the best meals. The raw, bloody meat filling her as nothing else could. Ah, but this village. Back then she had been naive and lonely, and had seen a group of children playing. She had run down this very hill, intent on joining the human children in their game. When they had seen her demonic countenance, they had run screaming in terror from her. And their terrified screams had brought their parents. When they saw her they had been quick in their punishment. They had beaten her to within an inch of her life, cursing her for merely being what she was. They had called her a "filthy monster" and an "abomination".
Shijira flexed her claws. She was much older and stronger now. She knew that a few of the residents within this village had been the same ones who had beaten her. They may be old and withered, but that didn't matter to her. What mattered to her was that they were still alive. She planned to change that though. Oh, yes. She was going to repay them for their hospitality.
She walked down the small dirt path that led to the village, her walk slow and graceful, tendrils of bluish-black hair blowing across her face. She had neared the entrance to the village when she stopped, a small boy blocking her path, his eyes wide with fright. A cruel smile spread slowly across her lips. She had found her first plaything.
A woman wandered out of her hut, wiping her hands on the front of her clothes. "Kiiienjiii! Where are you, boy?!"
The mother shook her head, a disgruntled frown forming on her face. That boy. He always manages to wander off when I need him to do something for me.
The mother walked to the center of the small village and stopped, cupping her hands around her mouth. "Kienji! Kienji, where are you?!"
"Woman, stop that infernal racket! What's all this ruckus over?" The village elder asked as he limped his way over to the now agitated mother.
"I can't find Kienji! You don't suppose he wandered away from the village again, do you?" The mother huffed, working herself into a proper fit. "I don't know how many times I've told that child to stay near home. Why, when I get my hands on hi--"
She broke off in mid-sentence as she felt something drip onto her head. "Is it raining? I saw no clouds a few minutes ago," she said. She tilted her head back, eyes squinting against the sun, and then widening in shock. "Look! What is that? There's something up above us!" The mother pointed.
The village elder looked up as well. Indeed, there was something silhouetted against the sun. "I don't know. I can't even make it out because of the sun."
At that moment all hell broke loose. As the mother was staring up into the sky at the thing, warm liquid spattered across her face and the ground around her. The village elder started screaming frantically and waving his arms around as he backed away from the blood soaked mother. And then the source of the blood was flung away from the figure in the sky, the body landing at the mother's feet. The mother retched. She was no longer a mother. Her son lay at her feet, his throat slit so harshly that his head hung on by only a small sliver of skin.
Cruel laughter floated in the air, small hairs on the backs of necks standing on end to anyone within hearing distance. They were now in the presence of a demon. The only other noise that could be heard was the pitiful sobs coming from the mother of the dead boy Kienji, her shaking hands hovering just mere centimeters above his body, afraid to touch the mangled thing.
Shijira drifted down to the ground and stood beside the loudly sobbing mother. "Stop your sniveling, filthy human, before I shut you up myself. I did you a favor. That boy had a sickness in him. I could already smell Death on him. He would have died a much slower and painful death had I not had mercy upon him."
Shijira cocked her head to the side and fell silent for a few moments, as if she were listening to something far away. She could sense someone approaching. She quickly turned her attention back to the village, a smile on her beautiful face now.
"However, for the rest of you, for your treatment of demons in the far past and possibly even the present, I shall rid this planet of your existence."
Shouts of protests and frightened whimpers arose from the villagers. The village elder stepped forth on wobbly legs, his voice not much better. "Y-you cannot do this. Surely you know th-this village is under the protection of the Demon Lord of these Western Lands. If you wipe this village out he shall surely take it as a personal offense."
"Yes, of course. How silly of me," Shijira said slyly.
The village elder wiped his brow in relief. For a second there he had thought she would actually kill them all...
"I am quite sure, however, that the Demon Lord would not care if I rid this village of one doddering, old fool." Shijira laughed as she watched realization spread across the old man's features. She felt no pity for him though. She did not recognize his appearance, but she definitely recognized his scent. He had been one of the villagers who had been the most brutal in the beating.
She flicked her hand outwards, black tendrils whispering around her body and gathering into a focal point in the center of her open hand. Shijira kept her violet eyes focused on the old man, a wide grin on her face as a black orb grew in her hand. The orb's depthless black seemed to pull light into itself and devour it, causing its void to grow. The orb pulsed with seemingly a life of it's own.
"Now die, foolish human."
Shijira pushed her hand outward, thrusting the orb at the old man. All he could do was stand there, paralyzed with fright. The black orb hungrily tore through the midsection of the old man, neatly cleaving him in half before the orb burned itself out. The old man's upper section lay some yards away from his lower half, his intestines spread out around him, sightless eyes gazing into nothingness.
"Just what do you think you are doing by attacking a village in my domain?" A voice asked from behind Shijira, void of all feeling.
The villagers whispered in fright, all dropping to their knees, foreheads touching the dirt. It was the proper respect due to such as the Great Demon Lord of the Western Lands.
Shijira slowly turned around, eyes alight with amusement. "Forgive me, Great Demon Lord," she said sarcastically. "I was merely returning these humans a favor."
"And by doing so you have insulted me," Sesshoumaru replied. "For this, you shall die."
Author's Note: If you're confused about Shijira's age due to the jump into the future, don't be. In human years, when her parents were killed she was eight. So, that puts her at seventy-eight now. But that's just in human years. Going by demon years, she's still quite young and just entering into her prime. And let the blood bath begin.