Disclaimer: I do not own Supernatural or it's characters. I do however, own Blaise Tucker and the plot to this story.

It was coming after her, and it was coming fast. The petite brunette wasn't sure if she would be able to outrun it for much longer, but all she needed was a few more minutes. She could hear the growling of the vampire chasing her; hear his fangs as they slid into place over the normal, human teeth.

Not much farther, the girl thought to herself as she forced one more burst of energy into her burning legs. Then, just as she felt as if she would collapse the girl saw the alley. She ducked around the corner of the small coffee shop on her left and flung herself down the dank, dim alley. Reaching up to the cylindrical tube slung across her back, the girl popped the lid off it and drew out a long sword. The blade gleamed black in the dark of the alley, the lone sapphire perched at the end of the hilt glinted darkly as a small amount of moonlight hit it. Still running, the girl pivoted on the toe of her converse and spun herself around to face the pursuing vampire. The blond-haired monster barely had time to skid to a halt as the girl swung the sword and swiftly be-headed the vampire in a matter of seconds. The head rolled to a stop at the girl's feet as she returned her sword to it's casing.

"Well that was rather easy," Blaise Tucker grinned broadly as two men appeared at the end of the alley entrance, "It's about time you two showed up." The men stopped in front of the vampire's body, the taller one shaking his head but grinning at Blaise. The shorter one crossed his arms, but he was also grinning,

"Seriously Blasie, it's not our fault you run faster than normal people," the tall man said.

"Well, she's not exactly human either there Sammy," the shorter man said, his green eyes glinting with amusement.

"Jealous Dean?" Blaise taunted, "Who knew the famous Winchesters would be jealous of someone like me." The small girl burst into laughter while Sam and Dean Winchester began preparing to dispose of the now fully dead vampire.

It didn't take long to finish the job and Sam, Dean and Blaise were soon back inside their small motel room.

"Thanks again for helping us on this hunt Blaise," Sam said as he grabbed three beers from the motel's mini-fridge. Blaise waved her hand at him dismissively as she accepted a beer and twisted off the cap.

"I'm always happy to help my two favourite guys," the brunette grinned, removing her long dark hair from it's braid, "besides, it's been far too long since we've hunted together."

"I'll drink to that!" Dean cheered as he took a long pull from his beer. Suddenly there was a sound of feathers and material rustling and a voice spoke next to Dean, almost causing the eldest Winchester to choke on his drink.

"Hello Dean, Sam," the deep, gruff voice belonged to a pale man with dark hair and sapphire eyes that suddenly landed on Blaise and bore into her with such intensity the young girl squirmed under the gaze. He was dressed in a black suit with a white collared shirt and loose blue tie. A beige trench coat topped off the odd ensemble.

"Castiel! Don't do that!" Dean coughed as he tried to catch his breath. Sam looked at the man, Castiel, and raised an eyebrow.

"What's up Cas?" The younger brother asked but Castiel was still staring at Baise. The girl stared back, not wanting to let this strange man who had appeared out of nowhere know how uncomfortable he was making her. Castiel didn't answer Sam's question and the two brother's exchanged glances before Dean cleared his throat and stood up.

"Why are you here Cas?" Dean stepped up beside Castiel and the man finally tore his gaze from Blaise to look at Dean with his intense gaze.

"I felt an unknown presence with the two of you so I came to check it out," Castiel explained. Dean glanced at Blaise who merely shrugged then stood up to introduce herself.

"I'm Blaise Tucker, a hunter like these two," Blaise smiled, offering her left hand for Castiel to shake. The man didn't take her outstretched hand, instead he looked her up and down with his head tilted slightly to the side.

"You don't look like a hunter," he commented. Blaise looked down at herself, surprised at the statement. She was dressed in a flowing ankle-length skirt, dark blue tank top and black leather jacket. Sam laughed at Castiel's comment and even Dean chuckled, leaving the room's other occupants confused.

"He's right you know," Sam smirked slightly, "I mean, it is pretty unusual for a hunter to wear skirts on the job." Blaise crossed her arms, suddenly self-conscious. So what if she preferred to wear skirts? She'd always found the clothing to be much easier to move in, especially on a hunt.

"Anyway, Blaise," Sam said, "This is Castiel, he's an angel." Blaise's eyes widened in horror. No, the thought raced through her mind, he can't be here to kill me. There's just no way, I was careful to keep out of the angels' radar.

"Cas,"Dean began as he moved to stand next to Blaise, "meet Blaise Tucker, she's a hunter like us and she's also our younger half-sister."

Castiel's eyes widened in shock as he stared open mouthed at the siblings. All he said however was, "Are you sure?" Sam nodded.

"We met her a few years back while on a hunt with dad. He thought she was her mother at first but then Blaise introduced herself to us." Sam explained.

"John Winchester had had a very brief tryst with my mother, that I know he regretted, while he'd been on a hunt and then nine months later, voila!" Blaise said, "John never did see my mother again, but there was no way for that to happen as she died during childbirth. He knew me though and couldn't believe that he had a daughter, much less one who was also a hunter. My mother's father raised me to hunt, he taught me everything I know." Blaise's eyes had glossed over slightly as she recalled fond memories of her grandfather teaching her how to use a sword and clean a gun.

"Dad hated her at first, until she saved him from being ripped to shreds by a wendigo." Dean clapped the small girl on the back with enough force to almost knock her over and she punched him back playfully, "We've hunted together on and off since then." Castiel was still staring at the three hunters with shock filled eyes. He couldn't believe what he was hearing. It couldn't be true, he'd have been told about it, wouldn't he? But yet, here he was and the truth he couldn't bring himself to believe was staring him straight in the face. The words came to his lips before he could really think of what he was saying.

"Dean, Sam, you're related to an abomination," He said, the words spilling out and he saw the look of pure agony that flashed across Blaise's face as if he had stabbed her, "that thing could never be your sister, she's a Nephilim, a daughter of angel and human infidelity."

Alrighty then! Here we go with some Supernatural fanfiction! Woot! Yeah I know, it doesn't start off very exciting, but it'll get better. Yes, Castiel starts off greatly disliking Blaise, but he'll come around ;D

And there are a few good reasons as to why Blaise is Sam and Dean's half sister. It could make sense too as there was Adam, the long lost half brother. But I digress, all will be revealed in later chapters. I hope you enjoyed chapter one and if you've got time, send along a review! Take care all!

BT