Disclaimer: I do not own the Harry Potter series, it's plot or characters. I own my plot, my characters and anything else you don't recognize unless otherwise stated.

Set during the Marauders time. Most things I'll be going off the wikia for when I need to. It will go into the movies/books time period after a while. I had to go back and figure out how old everyone was and what years they would be in since originally I had Bellatrix and Narcissa in the same class and that couldn't happen (Bellatrix wouldn't even be in school then). But I fixed it. So it should all be accurate now.

Sum: (Marauder Era) Erin Norton is a vampire. Remus Lupin is a werewolf. An unlikely pair to say the least but a close pair nonetheless. Trusted with the other's secret, and inseparable until they're placed in rival houses. Sirius/OC/Severus (Goes into books/movies) (I'm sometimes really bad at summaries and this is one of those times. )

Updating/rewriting this (7-9-16) This chapter has been updated.

A painful howl of a scream pierced the through the silence of the night causing Erin's head to snap in its direction. From her place high in a tree she could see that nearby birds flew away from the source and a few animals scurried away. The trees rustled and branches snapped as something headed her way. There was another strangled howl before a figure fell into view through some bushes. Erin watched with wide eyes as the figure twisted and turned on the ground as it whimpered. She flinched as she heard the loud snap and crack of bones. She couldn't look away as she saw the hair retreat from their body and the overall size of the figure shrink down. With a final cry the figure stopped moving. They lay there, their chest heaving up and down. The way the cool air frosted their breath made them resemble a hard working chimney. After a moment the boy curled up into a ball and began to shiver as a cold night wind hit his bare skin. He looked to be around Erin's age and was very skinny but not unhealthily so. The boy shook violently as he whimpered, tears streaming down his cheeks. Erin frowned as she watched him as he sobbed. She took off her jacket before dropping it down to him. The boy flinched as it landed a few feet from him. He immediately looked up into the tree and spotted her. Her green eyes seemed to shine slightly, even in the dark. Of course he could see her almost perfectly clear through the dark as she could see him.

"You'll catch a cold." she said quietly as she tilted her head. The boy looked to the jacket, then to Erin then back to the jacket before he pulled it on and covered himself.

"Won't you come down?" he asked as he looked back up at her. Erin smiled and nodded before she stood on the branch. The boy's eyes widened and he stood as well pulling the jacket down to cover himself as best her could. As Erin moved to hang from the branch, before she dropped down, the boy finally noticed how high up she'd been and wondered how she'd even been able to climb that high on her own. Erin landed crouched on the ground with a soft thud. She stood up and brushed any dirt off the pleated skirt of her dark green collared dress. "How…?" The boy breathed out as he looked from the girl to the branch again. Erin smiled and as the boy lowered his gaze back down to her, and caught sight of her teeth, he understood. "You're a vampire."

"And you're a werewolf." Erin said with a nod. "I won't tell anyone if you won't." The boy shook his head.

"Of course not. I-I wouldn't dare… Thank you."

"I'm Erin Norton." she said as she brushed her black hair behind her ear.

"I-I know… we go to school together." He said as he finally remembered where he'd seen her face before. "We're not in the same class but I've seen you around." She nodded; she hadn't recognized him until she'd gotten closer to him, but she didn't remember his name.

"Normally when one gives their name you're supposed to give yours back." Erin pointed out before she sat on the ground.

"Oh- I'm sorry. I'm Remus. Remus Lupin." He said as he sat beside her. Erin smiled. "Thank you for…" he pulled her jacket tighter around him.

"You're welcome."

"How are you-? How do you go to school if…"

"I'm only half vampire." Erin explained as she looked down at her hands in her lap. "My father's a vampire but…my mum's a … well my mum's a witch."

"My father is a wizard!" He exclaimed with a grin. "I-I mean I am too! ...Are you?" Erin nodded with a small smile. "This is great." Remus said. "Finally someone else besides my parents know." He let out a sigh of relief.

"I could say the same. Do you know how hard it is having to hide my fangs all the time?" Erin asked with a sigh. "I wish I would lose them already so I could get my grown up fangs." Remus tilted his head.

"Vampires have… baby teeth?" he asked.

"Of course. You do, don't you?"

"Well, yes but-"

"Mine just can't retract like grownup ones do. There's no difference between us."

"Except the whole moon and blood thing." Remus pointed out with a slight smile as he rubbed the back of his neck. Erin smiled back with a slight giggle that made his smile grow.

"Yes, except that."

SPACE LINE BREAK

"Do you ever… hate yourself?" Erin asked as she kicked the dirt under her swing before she looked up at the other children playing and running around on the playground. Remus frowned and looked at her from his swing.

"Why do you ask?" he asked.

"Cause…I do." she admitted. Remus' frown deepened. Erin glanced over at him briefly. "I know that I'll be accepted, at Hogwarts, for…" she lowered her voice. "being a witch but… people don't like vampires."

"Wizards are different; they're more accepting of… people like us. I mean muggles don't exactly like werewolves either." He said as he looked out at other children.

"Sometimes I wish I wasn't a vampire." Erin said. Remus looked down at his lap.

"Only sometimes?" he asked.

"It's who I am…but…"

"It wasn't a choice." Remus said. Erin nodded. "You're lucky though…" Erin turned her head to look at him. "Wizards are more accepting of vampires than werewolves. Vampires… you can control yourself… me..." he sighed. "My parents and I aren't even sure I should attend Hogwarts…"

"You have to go!" Erin said with wide eyes. Remus looked at her and saw the fear in her eyes. "I-I can't be alone again. I know about you and you know about me. It'll be so much easier for the both of us."

"But it won't be safe for you, or any of the other students, if I attend." He insisted. "I can't control it." Erin bit her bottom lip. "I want to be there with you, I really do, but I don't want to put anyone in danger."

"But how else will you learn to be a wizard?"

"My father could… home-school me." Remus shrugged before letting out another sigh. "I don't know… this would be so much easier if I were normal." Erin frowned.

"If that's normal what does that make me?" she asked. Remus' eyes widened.

"No-! I didn't mean-! I didn't mean that you weren't…"

"It's okay. I know I'm not normal." she said quietly as she looked down.

"Erie… I didn't mean it like that… You're much more normal than I am." He said. Erin peeked up at him. "I'm sorry."

"You don't have to apologize." She said. "Just…" she looked back down at her hands in her lap. "Please think about going to Hogwarts?"

"Of course." Remus said with a smile. Erin peeked up at him again before she smiled back. "Do you want me to push you?" he asked. Erin's face lit up.

"Okay!" Remus got up and moved behind her as she held onto the chain of her swing. He pushed her gently making her giggle. "Remus?" she asked.

"Yeah?" he asked as he gave her another push.

"Will you always be my friend?"

"Of course, Erie."

So there's the prologue. Let me know what you think so far. Remember this is going to be a Sirius/OC/Severus but not polygamy.