Title: Bound by Loyalty

Rating: PG-13

Spoilers: Harry Potter- Pretty much books 1-4.

Buffy the Vampire Slayer- Seasons 1-5 and some of season 6.

Pairings: Buffy/Sirius Black, Harry/Ginny, Ron/Hermione

Summary: Buffy gets a letter inviting her to help teach at Hogwarts. Dumbledore tells her about the fight with Voldemort, and she agrees to help protect Harry Potter. While there, she learns things about herself that she never knew, and she finds a way to live. Meanwhile, Sirius Black can't stop thinking about the blonde Slayer that has suddenly invaded his life.

Disclaimer: I don't own any of them. Buffy goes to Whedon, and Harry and everybody in the Potter-verse go to Rowling. If you don't recognize anyone, they're probably mine. I do own the plot, though. Don't sue. Please.

Authors Note: Thanks to Bridget Spackman, blondi gurl, charmedfanatic3000, kitty minky, mistress of metal, and fairieangel for reviewing.

Kitty minky- Yes, I hate these stupid background chapters. They suck!

Mistress of metal- Well, I think that Hermione is like Willow, Ron is like Xander, and Harry is like Buffy, so she'll feel kinda close to them. Remus will be pretty soon. When you see who Mr. Invisible is, you'll probably feel disappointed. It's not that exciting.

Well, here's chapter 9.…

……………………………(Chapter Nine: Invisible People)…………………………….............

'Sometimes, I feel a little helpless,

Seems like (well) I can't do a thing.'

-Lindsay Lohan "What Are You Waiting For"

There was an uncomfortable silence between them as they walked. Buffy kept glancing at Sirius, then looking away when he looked at her. Searching her mind for something, anything, to say, she blurted out the first thing that came to her mind. "So… people thought you killed other people, huh?" She said without thinking. Her eyes widened when she realized what she said. 'Way to go Summers. Make the man more uncomfortable and make yourself look like an ass at the same time. Way to multi-task.' She winced. Sirius stopped to stare at her. "Sorry. I didn't mean to say that. It just kinda… came out. I mean, I don't believe you did it or anything, just that you were accused of killing people and there I go again and I'm babbling, aren't I? Okay." She paused, taking a deep breath. Sirius was still looking at her, his face an unreadable mask. "Listen, I understand how it feels. I-"

"How can you understand?" Sirius calmly asked, pushing his anger down. "You didn't have people think you killed someone. You didn't get betrayed like I did." He was still calm, but some of his anger was showing up in his green eyes. He saw Buffy's hurt look and regretted what he said.

"But I do! I know what it's like to be betrayed, and to have people think I killed someone. I was 17 years old. It was when Kendra died. It was my fault too. I was fighting Angelus. Willow, Xander, Giles, and Kendra were at the library. Angelus was only a distraction for me. Drusilla came while I was gone. She killed Kendra. When I came back to the library, Giles was gone and Willow, Xander, and Kendra were on the ground. I was checking Kendra's pulse to see of she was alive. That's when the police found me. They thought I killed her and they tried to arrest me.

I escaped and ran. That night my mom found out I was the Slayer. I tried to leave to save Giles, but she wouldn't let me. She said that if I left the house I could never come back. And you know what I did? I left. I saved Giles and I ran away after killing Angelus. I went to LA for three months when I realized I couldn't keep running for the rest of my life and I went back. I was cleared of the charges and my mom let me go home." She stared at him. "I understand what you went through, because I went through horrible things too."

Sirius sighed, running a hand through his hair, frustrated. "I- I'm sorry. I just… it's hard, hearing Dumbledore talk about it. Him telling the story brought up memories," he explained helplessly.

"I know how you feel. I didn't exactly like telling my story to a bunch of people I don't know. Listen, it's 11:20 and the kids should be here soon, so let's sit down." They went to the Gryffindor table and settled down.

At 11:34, they arrived.

……………………………….......

At first Buffy didn't see them, but she could feel them enter the room. She looked around and saw a shimmer of… something. Not knowing what it was, she got up and pretended to walk around the room.

Fiddling with her ring, she 'accidentally' dropped it near the shimmer just to make sure something was actually there, and that it wasn't just her imagination. 'Nope,' she thought. 'Not just my over-active exhausted mind. Something's there.'

Abandoning professionalism, she tackled Mr. Invisible. She stared in surprise at what she saw. Or who.

………………..(7 minutes earlier: 11:31)………………….

Harry, Ron, and Hermione practically ran to the Great Hall, careful to stay under the Invisibility cloak. They'd had a hard time getting out of the Gryffindor common room, because Fred and George Weasley, Ron's 7th year twin brothers, didn't go to bed until 11:23 p.m. and they had to wait a few minutes for the coast to clear before thy snuck out. They had reached the Great Hall at 11:33, and they all stopped in surprise and concern when they saw Professor Summers sitting on a table. They were relieved when they saw Sirius though.

Then they stiffened when Professor Summers scanned the room and her rested on them, then they had breathed a collective sigh of relief when her gaze continued scanning the Hall. They stood where they were when she suddenly got up and walked around they room. They stilled and pressed together when she dropped her ring right by them. Professor Summers bent over and picked it up. As she put it back on, she looked directly at them. And then she suddenly tackled the three.

Hermione was slid a few feet away, but Ron and Harry were suddenly looking up into the wincing face of Buffy Summers. "Oops," she, Harry, and Ron said at the same time. They looked at each other in astonishment, then Harry and Ron laughed and Professor Summers smiled.

Sirius ran over to them, asking if they were alright. Buffy rolled off of the two students and lay beside them, slightly embarrassed. The poor kids that she tackled stood up, dusting themselves off, but Buffy just lay there wishing the ground would open and swallow her.

"Are you alright, Buffy?" Sirius asked, standing over her. He looked at her, concerned. When she had gotten and walked the room, he had thought that she was merely exploring, so he had just stared off into space. Then she had jumped at air, but had hit something solid. Hermione had slid on the floor, becoming visible, and the invisibility cloak had fell off of Ron and Harry, and He saw Buffy laying on them.

"Oh yeah, just fine. Mortified beyond belief, however. On my first day of teaching, I'm late for class, and them I go and jump on top of three students! I'm not making a very good first impression, am I?" She asked a smiling Sirius, who shook his head no. She sighed and got to her feet, dusting herself off and straightening her clothes. She looked at Harry, Ron, and a now standing Hermione. Smiling sheepishly, she said, "Sorry about that. I don't do so well with invisible things."

"That's okay. It's kind of our fault. I guess we shouldn't have kept the invisibility cloak on. How did you sense us, anyway?" Harry asked curiously.

"O-oh. Well… um." Buffy wasn't exactly keep on the idea she was the Slayer to a couple of kids. Sirius looked, his gaze reassuring. "Well, it's like this…" and she told them.

………………………….

This chapter is really short, and I won't be able to update as much because school is about to start. So, stay tuned and I'll try to update soon. Thanks for reading!