A/N: yes, I am such a terrible person for starting another story when I have 3 other stories, but I swear, I am working on them.

For this X-over, the NJBC(unfortunately) will not be performing magic. I think if they did, it would just get way too confusing because then I would have to have this whole thing where they got their wands and where the magic came from and stuff, so, no, I am not going to be doing that.

And if you don't already know, everything in S1 has happened up to this point. Blair just got back from a summer in France(minus Lord Marcus), Serena is still pining for Dan, Chuck is feeling guilty about his Blair situation, but won't admit it, and Nate is...being Nate, I guess.

"Ugh, Serena, I'm going crazy!" Blair tried to drown out all the excess noise in the crowded London train station as she, Serena, Chuck, and Nate(who were pushing their bags for them on baggage carts) got closer to platform 9 3/4.

Chuck smirked, "I'm afraid it's too late for that, Waldorf." Nate snorted with laughter and Serena tried to hide a smile at the appalled look on Blair's face.

"You're right, Bass. So I'm surprised you haven't abandoned me already." Blair's voice was suddenly saccharine sweet, though there was an underlying venom that even Nate could catch.

Serena saw Chuck flinch, but then cover it up with another smirk, though this one was faltering slightly at the corners. She gave him a sympathetic look and Nate put a hand on his shoulder, but Chuck shrugged(literally and figuratively) both gestures off.

Nate sighed, meeting Serena's eyes and shaking his head sadly. It was no use; they were talking about Blair Waldorf here, after all.

Surprisingly, Serena met his gaze with a determined glint in her eyes. She marched up to Blair, grabbed her arm, and before she could protest, had dragged her forward a few more feet, so the boys couldn't hear what they were going to talk about.

'What, Serena?" Blair said, annoyed. She attempted to straighten out the sleeve of her coat, trying to avoid wrinkles.

Serena sighed, discreetly glancing behind her to make sure Chuck and Nate hadn't tried to catch up; they hadn't. She turned towards Blair, "Eventually, you and Chuck are going to have to work out your issues."

"What issues? I'm issue free." Blair answered dismissively, though the grip on her Marc Jacobs handbag had tightened.

Serena shook her head. That's exactly what Chuck had said when she had told him the same statement. (And look how well that turned out). "B, stop trying to pretend you have this perfect life, when you obviously don't. You and Chuck have major issues that you need to work out!" She was trying very hard to be supportive, but frankly, Blair's "perfect life" facade was getting pretty old, pretty fast.

Sparks were practically flying out of Blair's eyes when she said, "For you're information, Serena, Chuck and I have absolutely no issues that we need to work out. If it can be helped, I am not going to be speaking to Chuck this entire time. Why don't you try working out you're Cabbage Patch issues before bothering me again!" She suddenly seemed to realize what she just said, because she tried to apologize, "Serena I didn't-"

But Serena was having none of it, "That was low, Blair, even for you." She stormed off back towards the guys who were looking at her confusedly, having looked up the outbursts.

Blair just stood there, not only because she felt regret for what she had just said(which she did, quite a lot actually) but because they had also reached their destination.

Platform 9 3/4.

One week ago...

Serena slowly looked up at the ringing of her cell phone. The personalized ringtone told her who was calling, "Hey, B!" she said brightly, "What's up?" she inwardly cringed, silently hoping that Blair wasn't calling to complain about Chuck. Again.

"You won't believe what just happened to me, S!" she needn't have worried; Blair seemed very excited for some reason. Did that mean she'd made up with-

Serena crossed her fingers before saying, "Did you and Chuck finally work out you're issues?" If they did, Serena would be(oh-so-very) glad. She didn't like Chuck under any pretense,(okay, maybe they had like a...brotherly-sisterly bond thing) but even so, she still didn't like seeing him mope around the Van Der Bass house in the Hamptons all summer long. It was ruining her own summer, having to pick him up from random bars almost every night. It was true; Chuck Bass just isn't 'Chuck Bass' without Blair Waldorf(or so he'd admitted to her drunkenly one night).

Blair had only just got back from Tuscany last week, but maybe-

Blair let out a rather unladylike snort though, and Serena took that as a 'no'. "Absolutely not! He abandoned me at the heliport, and I am never forgiving him. That's not my problem anyway..."

"Oh." Serena tried not to sound disappointed, "Well, what is your 'news' then?"

Blair's' voice suddenly rose excitedly again, with a hint of triumph added on, "Headmistress Queller sent me a letter, telling me to come to school tomorrow for a meeting of sorts. Maybe I got into the early admissions at Yale! I knew Nelly Yuki couldn't come up against the powers of 'Blair Waldorf'!"

"Headmistress Queller sent you a letter?" Serena looked down at her own note; she'd just gotten it in the mail today, too.

"Yes...why?" Serena imagined Blair looking at her phone suspiciously.

"Um...well...I, uh, got a letter like that too, telling me to meet at school at 11 o' clock in the morning tomorrow...-But, I'm sure it doesn't mean anything,"she added quickly, when Blair's line went deathly silent, "I...maybe they got me an early admission into Brown!"

"Yeah...mine told me to meet at 11 o' clock a.m. too... listen, I...I have to go-"

*CLICK*

Serena slowly lowered the phone from her ear and cursed herself for having ruined Blair's excitement. Blair probably did get an early admission into Yale, though...hopefully.

Suddenly her phone beeped:

ONE NEW MESSAGE FROM: NATE.

What the-

S, did u get weird letter from Queller 2day telling u 2b at school 2moro at 11 A.M.? Cuz C told me he got 1 too. -N

Chuck and Nate got the letters too? Great. So this probably wasn't about college admissions.

Yeah, + B told me she got 1. Do u know if ny1 else got it? -S xo

Serena waited patiently until her phone beeped again.

B got it 2? Gr8. And idk if ny1 else got 1. -N

She paused before keying in her answer.

I know! B has been drving me crz! It's just C, C, C all the time. Sry, g2g, need 2 talk 2 B. c u in the A.M. -S xo

10:40 A.M. the next morning...

Chuck tried to not pull his hair out as Nate went on and on with theories of why Blair and Serena would get those weird letters too. Ranging from 'they all got an early admission into the same college' to 'they all got expelled for that pool thing', the theories were all pretty ridiculous. As he drowned out Nate's voice, Chuck spotted Blair and Serena on the sidewalk beside them.

Signalling for Arthur to slow down, her lowered the window and called out, "Waldorf, sis, let me give you guys a ride." the innuendo was more aimed toward Blair, but Serena still scowled at him, "I'm sure you would, Chuck. Leave us alone. And we are not related, so don't all me that."

Chuck brought a hand up to his chest, "You wound me, sis."

"I wish." Serena muttered.

"-I just thought, that because we were all going to the same place..." Chuck continued.

"I don't care if we are going to the same place, Bass," Blair suddenly spoke up, "Neither Serena nor I are getting into that limo, -even if Nate is in there with you." she added, when Chuck had opened his mouth to retort.

Chuck raised an amused eyebrow, "How did you know I was going to bring up Nathaniel? I'm impressed."

"I guess I know you too well." Blair retorted before she could stop herself. She looked embarrassed afterwards, refusing to meet Serena's gaze. Nate just looked confused, looking from one person to the other.

After the general shock had worn off, Chuck smirked and agreed, "Yes, we do know each other very well." he gave her a suggestive wink, but Blair just rolled her eyes.

Nate complained, "Hey, ex-boyfriend, here!"

"If you have forgotten, Nathaniel, I am also and ex of our lovely friend, Blair, here." Chuck replied.

"Oh, yeah, I remember, now..." Nate said comprehension dawning.

Chuck snickered and said mockingly, "Aaaand, Nate the Great has finally reached the page that we are all on already," he glanced at his watch, "Two minutes, 32 seconds; that's a new record. You should be proud, Nathaniel."

Blair covered her mouth to stifle her giggles and Serena buried her face into her coat to keep from snorting. but, as always, Nate was just as confused as ever:

"What are you talking about? We're not reading a book!"

Soon, the four of them finally got to Constance/St. Judes, Chuck having convinced the girls to get in the limo after the 'Nate' joke(which Nate was still confused about, by the way), and they arrived at school with five minutes to spare.

Chuck got out first and he helped Blair out, Blair trying to pretend that she wasn't touched by the gesture. Nate managed to help Serena out, after finally deciphering the look Chuck and Blair were shooting him, but ended up getting her long Burberry trenchcoat stuck in the limo door.

After many apologies(Nate) and laughs(Chuck and Blair), the four managed to make their way up the stone steps, Serena sighing as she gazed upon her newly creased coat, Nate trailing guiltily behind her, Blair and Chuck surveying the scene, trying not to burst out in raucous laughter again.

To their surprise, Headmistress Queller was in the courtyard, sitting at one of the tables. When she saw them, she ushered them into the office that was in between the girls' and the boys' schools. The classes in this hall were the only classes that both genders shared: English, Mathematics, Chemistry, and Sociology. The NJBC just so happened to share those four classes together.

All of them took AP English, AP Math, and AP Chemistry. They also took French, much to the chagrin of Blair, because she had been afraid that she would have no friends in the class, seeing as most of the people she knew decided to take Spanish instead.

Neither Nate, Serena, or Chuck were in any way qualified to take AP classes, but somehow, Chuck was managing to make B-plus' in those four classes while making D-minus' in all the others; only Blair knew the truth: Chuck only wanted to get "high" grades in the classes that would help him run Bass Industries in the future(if Bart even gave the company to him, anyway).

Serena was averaging on a B in all her classes, except science, which she kept getting C's in, because she didn't agree with the way the Miss Bramford was teaching. Nate was also doing okay, getting B-minus' and C-plus'.

As they got into the Headmistress' office, Chuck settled into a seat immediately, as if he owned the place(he probably could though). Queller shot him an annoyed look, but didn't say anything but, "Yes, you may sit down now."

Chuck just smiled lazily up at her.

Queller rolled her eyes, moving towards the desk in the front. "So,'" she started, "I called the four of you here to discuss some information with you. Your parents have signed you up for an exchange program to a school in Great Britain."

Nate's mouth fell, Chuck snorted, Serena squeezed Blair's hand excitedly, and Blair put her mouth into a thin line, "What is the school called?" Blair finally asked, after an excruciating silence had descended upon them.

Queller opened her mouth, but Chuck said, "Wait, how do we know you're not just tricking us so you can get rid of us?" he eyed the papers on the desk suspiciously.

The headmistress pulled out four contracts, passing them out to the right person.

Blair gaped at hers, "No...my mom would never..." but there it was, Eleanor Waldorf's signature, curly q's and all. Chuck didn't even have to look at his contract to know if his father had signed it. Serena didn't either. Nate, however, needed help finding the signature part, so Chuck pointed it out to him,"Oh... I see.."

They handed the contracts back to Queller, who had a self-satisfied expression on her face. "Well, do you believe me now, Mr. Bass?"

Chuck muttered something like, "Sure."

Queller nodded, "Okay, the exchange school you will be going to is called 'Hogwarts'."

There was a long silence until Nate broke it with a, "Hogwarts...isn't that a disease?"

"No, Mr. Archibald, it is not."

Present Day...

Harry Potter stepped onto platform 9 3/4 trying to find the muggles that he was supposed to help get to Hogwarts. Apparently Hogwarts had gotten a new exchange program. Dumbledore had sent him a letter, complete with pictures of the four people he was supposed to help. He spotted a brunette in a school uniform that looked similar to 'Blair Waldorf'. There were three other people in uniforms a few feet away from 'Blair'.

Excellent. He had found his muggles. Hopefully.

He approached the brunette cautiously, who was staring at the three other people with regret on her face. "Um...hello."

'Blair' jumped slightly at the sound of his voice, "Oh..hi...are you, uh...Harry Potter?"

'Yes. You're...'Blair Waldorf', right?" he said, relieved. So, he had found the right people.

Blair nodded, moving her eyes back to the three other people.

He gestured to them, "Are those uh..."

Blair nodded, "Yeah..." her voice trailed of slightly.

"Did you guys get into a fight?" Harry asked softly, noticing the tension between the two groups.

A small smile flitted onto Blair's face, "Something like that."

Serena sniffled, "I mean, how could Blair say that to me? She knows that I...I still love Dan..."

Nate nodded, "Wait..." he looked around, "Where is Blair?"

Chuck narrowed his eyes when he saw Blair...with a mystery brunette; a mystery brunette that looked oddly familiar, "There she is...but, who is she with?" he felt a heat grow inside of him. A heat named jealousy.

"I think that's Harry Potter!" Serena gasped, tears already disappearing.

"The famous guy?" Nate asked, eyes getting all squinty in their direction.

"I think so...wait, they're coming this way." Chuck frowned when 'Harry' looped his arm through Blair's.

Blair was laughing when they got near, but her face fell when she saw Serena. She let the arm that was connected with Harry's, fall. "S...can I talk to you?" she asked quietly.

Serena looked like she was going to shake her head, but Nate gave her a small push in Blair's direction and she relented.

Blair pulled her away a few feet.

Harry gave a small smile in their direction, before turning towards the boys, "So...you must be Chuck Bass," he stuck his hand out to the scarf-wearing brunette and he nodded, "You must be Harry Potter."

Harry also nodded, then turning to the blonde, "And you must be Nathaniel Archibald."

"That's right." Nate gave Harry a friendly smile, "But you can call me, Nate."

"Okay-" but Harry was cut off by a loud sound. Blair and Serena were hugging each other tightly, tears in both of their eyes.

Chuck smirked, "I guess it's safe to say those two have made up."

Nate sighed with relief, "Thank God. I hate it when they plot against it each other."

"Plot against each other?" Harry raised an eyebrow.

Chuck and Nate gave each other a look, and then they both said, "Nothing." rather quickly.

Harry shook his head, but didn't say anything until Serena and Blair made it back. Blair gave Harry a warm smile that Chuck caught. He frowned at Harry. Harry didn't seem to notice the dark stare Chuck was directing his way, he was too entranced by Serena's presence, "You must be Harry Potter!" Serena exclaimed excitedly. She shook his hand, going into full chat mode,"The name's Serena Van Der Woodsen - or, Bass -" she corrected herself, "Chuck here is my step-brother, his father married my mother," she pointed towards Chuck, "I'm from New York, well, so are Blair, Nate, and Chuck. We all heard that you're famous- you are, right? So can I have your autograph?" she flashed him a set of pearly whites, and all Harry could do was nod blindly.

"Sure." he signed a piece of paper that Serena shoved towards him.

Suddenly all of their phones(except Harry's) beeped.

Gossip Girl.

It seems as if four of our most famous, or should I say, -infamous- UESers have disappeared off the face of the planet. Well, maybe not off the planet, but off the continent, at least.

London, anyone? Looks like the fab four have been shipped off on an "exchange program". At least 3 of the 4 of you deserve it, I should know ;) So, I have a message for the four of you:

S, still want D? Well, I doubt he wants you. D was spotted locking lips with not one, but two different girls; on the same day. Looks like his crush is gone. Watch out C, looks like D is trying to take over the role of "UES womanizer" and he might succeed at the rate he's going.

N, I hope your father gets out of the country before the feds get him; oh, wait, too late. Life in prison? Tsk, tsk, what has he been doing to get that punishment? And don't worry B, the UES will still be here when you get back, but I doubt your status will.

you know you love me,

XOXO, Gossip Girl

A/N: wow, this was the most I've ever written for FF(in one chapter I mean) 3, 568 words!

I hope the texts that Serena and Nate shared were realistic...If you'd like to see the full summary of this fic, and check out my other fics, go to my profile page. Sorry if I didn't get the location of Hogwarts right. And yes, I did dumb Nate down quite a bit, but he's so fun to write that way ;) plus, did the Gossip Girl blast make sense? I'm not so sure.

oh, and if you looked at my reviews, you'll see that I reviewed myself. I seriously had no idea you could do that...

R&R!