Before now, Alvara had been unable to act. She wanted too, she knew what was going on in this town, sensed the arrival of the Originals weeks before. But it involved the Supernatural, and was not harming any humans, right now anyway, and so she was not at liberty to intervene. It was how she lived, how she had been brought up – protect the humans. And so far Matt, Alaric, Jeremy, and Jenna had not been active participants in the mess that engulfed Elena Gilbert's life. Until they were, she would lie on the sidelines, and watch, and possibly kill any supernatural passer by's, like the guy in the bar last week.
She should have probably moved on by now, most jobs took a week at the most, but this was the most interesting and possibly problematic incident she had ever come across. Throughout her life there had been the odd 'revolution' where the vampires or witches planned to take over a small town, but there were generally amateurs, and like she said they took a week to take care of. If she was honest, it was the brothers that intrigued her, and she didn't just mean the Salvatore's. The Originals tended to lay low, avoid any major interaction with human life, and just restore order among their own kind.
To see them so open and with an obvious interest in the girl was intriguing. However their power in the vampire world needed to be monitored and if they did decide on any action towards the humans in Elena's life, she intended to be ready. And so, with the permission of Vespa, she stayed and co-existed with them, always watching and always ready.
Until Jenna. Jenna was polite in passing, had a ready smile, always trusting of others. And Klaus took her, changed her into a monster, and ripped her heart out. She wished she could have prevented it, but she couldn't. With their blatant interaction with the Supernatural, she focused on the protection of Jeremy, Alaric, Matt and Jenna the most, as well as the rest of the population of Mystic Falls in general. She had known something was coming; there was a change in the scent of the vampires, the Originals appearances became more frequent, and of course Alaric was possessed by Klaus- she sensed that straight away, in his mannerisms and the stench of burning roses and hay. But Vespa told her to stay away, to leave, it was nothing to do with us, it was interactions between their kinds. Until Jenna was killed, and the creature was born. Yet they still said it was none of our business and in the long term more would be saved because of this. However that day it became her business. And that day she did something she never thought she'd do- she disobeyed orders.
She had grown up with them, born as a slayer- a rare find. Some people wanted to be slayers to protect. Some people wanted to be slayers for revenge. And some had no choice. Alvara's body was born for this. She could sense the presence all kinds of the Supernatural in an instant, could reduce their inhuman strength and abilities to those of a human, and more importantly; her blood was the ultimate weakness to a vampire. Many vampires thought vervain was their only flaw and so becoming immune made them untouchable. That was because those who did know about a slayers blood were dead before they could tell anyone. Alvara was unique, and was rare to find as if there were any more born slayers, they generally didn't know about their abilities and didn't have the resources or guidance to use them to their true potential. Vespa had raised her, once her parents had initiated her, and though she was the only one of her kind, and so superior, she often felt like a puppet, ordered by the council to act out their wishes. But they were her family; they had protected her, guided her, trained her, and educated her of all the bad things in the world, things most people her age could only dream about. And those dreams were nightmares. But she was still a human, though with supernatural abilities of her own, and she still had morals. And she knew, no matter what Vespa said, no matter how much more knowledge they had on the matter – this wasn't right. And no more could she stand back and watch the town's lives continue to be ruined and allow this new creation of monster to roam the world. She was here to protect.
And that was how she came to be there, in the Salvatore home.