A/N: I own nothing.

This was a random plot bunny. I have lots of those. Enjoy :)

How the hell did he get here in the first place?! He snuck through the corridors of Dalton Academy, hoping to avoid any unintended collisions with people he might know. Jesus, you try to travel back in time and you end up in the best but worst days of your life!

As he rounded another corner, he realised he was outside the library where the Warblers had done their practise before the school burned down... He grinned, pushing open the door. Nobody was in there now, but he could see some music laid out in a mess in the piano, and there was the trophy case with all the awards and stuff they'd won... Barry smiled. No matter how bleak life had seemed back then, being Sebastian Smythe always had some upsides to it. But now he was Barry Allen again, and the Flash... He shook his head. He was definitely getting a rather large collection of alter egos.

When he'd originally planned on travelling back in time, it was only going to be back a year or so, and just observe a day in the past to help out with a case... But instead, after Smooth Criminal coming on the radio just as he'd reached velocity, he'd ended up thinking about his high school days as Sebastian Smythe... And hey presto, here he was, once again in Dalton Academy. He'd already nearly had a run in with some of his old lacrosse buddies. Imagine everyone's faces if they saw an older Sebastian Smythe, one who could move at super speed, and wasn't actually the 'Bas' they all knew, man they'd all-

"Excuse me, but you look a little lost. Can I show you the door?"

Barry froze. Ahh shit.

Barry (or Sebastian) stared at the back of the stanger, the rest of the Warblers behind him. They'd all been sneaking to the library to fit in an extra practise before a concert the next day, only to find the door slightly ajar and then on investigation discovering a random guy, probably about 25 or so, judging from his height, hanging in the library. He wasn't in uniform, so wasn't likely going to be a student... But there was still something a bit familiar about him.

"Yeah, anyway, who are you man? You do realise this is a Warbler's only area, right?" The guy sighed, bringing his hands up to his face, sort of face palming. Sebastian took a few steps closer, and could hear the guy murmuring to himself.

"Why the hell is it always me who gets into these bloody difficult situations where there is no easy way out?" Sebastian to say the least was confused.

"Look if you're not a Warbler you can get out, because we need to practise. And you're not wearing uniform." There was no response from the man, who was now bouncing on his toes.
Thad spoke up.

"Look man, if you don't get out of here, we're gonna make you get out of here." There was a split seconds silence when the man burst out laughing, making them all jump. He sighed.

"Oh, believe me, even if you don't. I am most definitely a Warbler." They all looked confusedly at each other. Nobody recognised him, Sebastian thought given the looks on everyone's faces, so how could he be a Warbler?

"How are you a Warbler?!," he asked, standing right behind the guy now, the rest of the group flanking their Captain. There was a resigned sigh from the guy.

"Why me?," he questioned nobody in particular. Sebastian suddenly had a thought, but it was quickly wiped away, as was every other coherent thought, when the man turned around.

Everyone else was shocked to say the least when they realised there were now two Sebastian Smythes in the room.
The older one smiled.

"Hi, my name's Barry Allen, but I believe you know me as Sebastian Smythe. And I," he sighed, folding his arms, "am a Warbler." There was a sudden gust of wind, and he wasn't standing in front of the group any more. Instead he was behind them. But that was...

"Impossible," stated Wes disbelievingly. Older him grinned suddenly, looking exactly like young Sebastian... Or Barry, that was just confusing.
"I am also the fastest man alive." His smirk widened as mouths dropped open. "Any questions?"

Barry guessed he shouldn't have been so direct, but he decided that keeping secrets would be a bad idea, especially from himself... And especially after Iris. Oh well, too late for that now. He just decided to grin and bear it as his old classmates and himself started looking like fishes. He sighed internally. So, it was going to be one of those days, was it?

"So..." He suddenly felt nervous. Well, at least on the outside he tried to look nervous. On the inside he was trying to stay calm and trying to work out exactly how he was going to get out of this mess. "Anybody got any questions?"

"Why do you look like Bas?," asked Thad. All the other Warblers started nodding and hmming their agreement.

"Because I am him." There was confused looks.

"But, you can't be him. He's standing right there," someone pointed out. Barry face palmed.

"Yeah... But I'm him and he's me because he's my Snixx and everything's just..." He threw his hands up in exasperation. "I don't know!"

"Wibbly wobbly timey wimey?"

"Yeah exactly..." Barry glanced at himself. There was curiosity in his eyes, but at the same time suspicion and disbelief. A lot of disbelief. He sighed. "You need proof. Don't you?"

"That would be nice yeah," his younger self said, folding his arms and smirking the famous 'Sebastian Smirk'. Everyone else followed suit, except for Sebastian's (or Barry's) closer friends, who were aware of the whole Snixx thing. It was still too weird to believe though, although by silent agreement they decided to be bit more... OPen minded to this seriously weird and out of normal situation. Like when Sebastian was studying science rather than plotting to take over the world, like most people thought he was.

"Jesus, was I really this much of a dick when I was younger?! Alright..." He thought quickly of what he was going to say to prove it. His full name? No that wouldn't cut it. What about something about his mother... He had a brainwave. It was going to make younger him hate him for leaving him on a cliffhanger, but... Desperate times call for desperate measures, right? He sighed again, the Warblers still looking at him expectantly.

"I... I found him. I think."

"Uh, found who you think? Because it would be really nice to know what the lame stalker is talking-"

"I think I found the guy who killed my... Our mom." There was silence.

"Dude, your mom's... Dead?!"

"She was murdered in front of me... Us when we were 11. I've been trying to find out who it was ever since. And I think I'm finally getting somewhere." He folded his arms, giving back his own Sebastian Smirk, which had dropped off younger hims face. Let the people know he had arrived."Does that prove my worth, meerkat?"

Everyone else was gobsmacked, including him. Here was an apparently older version of him, saying that he might have found that ass of a murderer... And he was smirking HIS SMIRK at him. This was too much.

"So, do you believe me now, then?," older him asked. Barry (well Sebastian) was baffled to be honest. He couldn't believe what he was seeing, and yet... He quickly ran the calculation in his head. Technically if you travelled at a fast enough speed, you could potentially break the space time barrier, creating a worm hole and travel back... Or forward in time. And considering the speed he'd just seen this guy move... Nothing was impossible right now.

He glanced around and realised that the rest of the Warblers were looking to him for guidance. He sighed internally: when you're the Warbler Captain, you gotta do what you gotta do. He quickly pulled up the smirk again, and walked slowly, but with a swagger up to his older self.

"I'll... BELIEVE you," he said slowly, his expression growing snarkier all the time. "When you prove you are me." The man threw his hands up in exasperation.

"Well what do you want me to do, asshole?!" He suddenly laughed to himself. "Never thought I'd get to say that to myself." Sebastian cleared his throat. His grin widened.

"Sing off. Right here, right now." There were whoops from the Warbler boys as they jumped in the air, and scurried into a circle, where they left a small opening for the boy and the young man to enter.

Barry just laid his head in his hands and shook it slowly.

"You know what? I can't deal with this right now. I am getting out of here and heading back to MY time where I actually do some good in the world rather than fuck up other people's lives like you do!" Sebastian looked gob-smacked, but that damn smirk was still on his face. He looked like he was about to interrupt, but Barry was suddenly on a roll. There were some things he'd always wanted to say to his younger self, if he ever got the chance. And now...

"Because you know what? No matter how shit life is back home, and what people think of Barry Allen, son of a so called murderer, you don't have to act like a dick to every single person you meet who does something better than you, or has life better than you, because you know what? In the end, IT. DOESN'T. HELP!" There was a second of silence where Barry and Sebastian were facing off, staring into each others eyes. There were tears in Sebastian's, but they were quickly removed with a blink.

"Well as moving as that was, I do believe its time for you to piss of, and go and dance with some other tramps who would dare to impersonate someone like me. And you're obviously not me, since I would have the decency to accept a Warbler sing off, but since you're not..." He reached out toBarry, spun him around...

Only to come face to face with the New Directions. Who suddenly looked very confused at seeing two Sebastian Smythe's, one in Dalton uniform looking as smug as ever, and one in normal clothes with the same smirk on his face, but watered down.

"Ok," said Blaine. "I think I speak for all of us when I say, what the fuck is going on here?!"

"Two she-queer-ers?!," questioned Satanna, her gaze flicking disbelievingly between the two. She was mildly aware of the 'Sebastian is my Snixx' scenario, but this...

"And how the hell are there two Sebastians?!," Kurt nearly yelled. Barry sighed.

"It's a long story..."

"But we need to prove something first. You can stay to watch if you like, as long as you don't mind your souls being crushed. Otherwise, be my guest. As much as you can be." The New Directions looked at each other. What the hell?!

"So... What exactly are you trying to prove?" Sebastian just rolled his eyes, spun on his heels and headed to the circle, where the Warblers all cheered. Barry just stared daggers at him before turning back to his old rival team...

"He had the great idea of a Warbler sing off." Blaine was confused. As a former Warbler, he'd heard of the sing off, but it was only ever used in serious circumstances. Well as serious as you could get in a high school Glee club.

"Why do you need a sing off?," he asked curiously.

"Apparently, he's me. So we're just trying to prove it. Care to join?," asked Sebastian spitefully, his smirk back in place.

"No," said Kurt shortly. The others nodded, gathering instead just inside the door. Barry sighed.

"Alright lets get this over with," he sighed. "The sooner I can get back home, the better."

The New Directions in the corner, were having a quiet chat about... The Sebastian duo.

"Didn't he say that he apparently WAS him?"

"Yeah... But I don't believe it."

"Why not?! I mean look at them. They are quite literally the same person. Its just that he's-" indicating Barry "- older. I mean, are you seriously telling me you cant see that?!" The argument would have gone on further, but then the sing off started.

"Well, this is gonna be fun," murmured Archie sarcastically. Everyone else murmured in agreement.

Sebastian started first, facing his older self in the circle, his smirk and attitude in place. He was going to take this bastard DOWN.

Bawawa Bawawawa

Bararar barbadaba

Badaba da da da

Da da da

Ooohoo! Let me tell you now

Ooh

When I had you to myself, I didn't want you around

Those pretty faces always make you, Stand out in the crowd.

Somone picked you from a bunch, One glance is all it took

And now it's much too late for me, To take a second look

Oh, Baby, Give me one more chance (To show you that I love you)

Won't you please let me, Back in your heart

Oh darling I was blind to let yougo (Let you go Baby)

But now since I've seen you back in his arms (I want you back)

Oh I do now (I want you back)

Ooh ooh baby (I want you back)

Yeah yeah yeah (I want you back)

Na na na na

Tyring to live without your love, Is one long sleepless night

Let me show you girl, That I know wrong from right

Every street you walk on. I leave tear stains on the ground

Followin' the girl, I didn't even want around

Oh baby, , All i need is one more chance (To show you how much that I love you)

Won't ypu please let me, Back in your heart

Oh darlin' I was blind to let you go (Let you go baby)

But now since I've seen you in his arms

Ooohoo

All I want, All I need

All I want, and all I need!

Is one more chance (To show you that I love you)

Baby (baby) Baby (baby) Baby (baby!)

I want you back!

He finished with a flourish, panting sightl. Surely, if he was him, he wouldn't be able to beat that. Oh, boy was he wrong.

Barry grinned. He was about to be severely underestimated. The song swiftly changed to 'Smooth Criminal.' It was going to be different doing it with, well himself and not Satana, and a capella rather than with those two awesome cellists (it made him want to learn to play that instrument, however when he tried he realised that a singer he may be, a cellist he was not. Mainly because of the God awful SOUNDS that thing could produce. He gave up about a month later) but... He was going to prove to himself that he was him, even if it meant being better than him. But to be honest, he really wasn't liking this trip down memory lane. It was going to catch up with him at some point in the future. He just wanted to get back home and again try and forget his years if being an asshole to everyone he knew.

Uh, as he came in through the window, it was the sound of a crescendo, uh!

He came into her apartment, he left the bloodstains, on the carpet, uh!

She ran underneath the table, he could see she was unable

So she ran into the bedrrom, she was struck down it was her doom

His yonger self was looking confused at this development, as were the other Warblers and the people form Mckinley, Satanna was just grinning like a mad woman, gibing him a nod. She knew this was the real Sebastian, only he could sing that song that... SEXILY. Anyway, Barry, raised an eyebrow at himself, smirking and daring him to back down. He was met with an identical smirk.

So Annie are you OK? So Annie are you OK?

Are you OK Annie?

Annie are you OK? So Annie are you OK?

Are you OK Annie?

Annie are you OK? So Annie are you OK?

Are you OK Annie?

Annie are you OK?

Are you ok? Are you OK Annie

Annie are you Ok? Would you tell us that you're OK

There's a sign in the window, that he struck you- a crescendo Annie

He came into your apartment, he left the bloodstains on the carpet

And then you ran into the bedroom, you were struck down, it was your doom...

They continuously traded songs, going through some old Warbler classics, and even some New Direction stuff, much to their annoyance, but by the end of it, everyone, including the New Directioners and Sebastian, or Barry, that this was indeed older Barry.
Older Barry folded his arms as the circle broke apart.

"Happy now? Have I proved my worth now, Sebastian?" The smirk was gone, replaced by an awed look.

"Your worth is proved." He took a few steps, and gave himself a hug. Barry was surprised. Ok, he hadn't expected THAT.

"Um, you do realise that this is both the most... awkward and weirdest hug I have ever had, right?," said Sebastian, letting some 'Barry Allen' leak out, rolling his eyes at his Warbler friends as they all grinned ad gave him thumbs up... And even a blown kiss from Wes. Which was weird. But then again what about this wasn't weird?

"You're right, this is awkward. But for now live with the fact we're probably destroying the unverse with a massive paradox... Thing right now."

"Don't worry. I know, but it's awesome anyway," he whispered in his ear. Then he let go of himself and Barry (the older one) faced the startled New Directioners.

"Guys, sorry for being an ass. Believe me, I regret it. And Kurt?," he said facing said person. Kurt raised an eyebrow. "I'm sorry about the smoothie." Kurt shrugged. "I'm also straight. Promise." That promoted an explosion of laughter from Thad and Sebastian to blush a bright tomato red.
Barry smiled. Finally, he could go home! He sped to where he put his suit, changed at super speed and raced back to the room. To everyone else, there was a fist of wind, a flash of yellow lightning, and it was suddenly the Flash in front of them. Barry smiled widely at everyone, giving a two fingered salute.

"Watch out for me in the future guys. Just... No telling? Please?!" There was an almost simultaneous nod from everyone. Barry grinned and waved. "See you in the future then!" There was a whoosh of air, a crackle of lightning, and he was gone.

Everyone looked at Sebastian expectantly. His eyes widened.

"What?!"

"Soooo..." Satanna said, all the New Directioners folding their arms in pretty much unison. "Barry?" Sebastian turned pale. Well that cat was now out of the bag, but how to get it back in..? He grinned.

"I'll explain..." Eyebrows rose in disbelief from Thad and some of his Warbler friends. "In the future!" Then he ran like hell to escape his angry (but not that angry) friends. And now, he thought as even the New Direction people chased him through Dalton, bumping into people and apologising, even his former rivals that were now friends.

Except maybe Kurt.

Epilogue.

"That... Was a weird day," said Thad as he threw himself onto the bed. He glanced over at Bas, who was staring at something. "Watcha got there, bro?" Sebastian looked up with a slight smirk.

"A note. From... Well me." Thad rolled his eyes.

"What's it say?" He handed it over to Thad, who read it aloud.

'Sebastian, or me I guess.

Listen, I probably shouldn't tell you this, but I will anyway. Top three tips for the future.

1. Trust Oliver... No matter what he does with those damn sharp and pointy things of his. Believe me, he likes them WAY too much.

2. I don't think I should really say this, but act sooner rather than later with Iris before you lose her. I've already lost her. Thank the 9-' I can't read that last bit, he's scrawled it out!"

"I know, probably too much of a spoiler. Carry on. It gets weirder." Thad shrugged.

"Ok. 'And finally,

3. DO NOT TRUST HARRISON WELLS. No matter what he does, no matter how nice he seems... You can't trust him.

And on that happy note I leave you with the advice of becoming a CSI. It's a great job, believe me! Take it from future you!

Also everyone will forgive you eventually.

With hope and stuff from the future,

Barry Allen aka The Flash
Aka Sebastian Smythe

PS Bear with Cisco and the names. Some of them are pretty cool and its great when he pisses my, um hero friend and his team off, but sometimes you need to reign him in. Please!'"

Thad looked at Sebastian as he took the note back.

"Bro."

"I know."

What Sebastian didn't tell Thad as they settled in was that there was a second now. Short and sweet.

'You'll know what this means. Eventually.

Trust the Queen of the City of Birds for his arrow flies true,
But beware the dark collision on a stormy night. The Force of the Speed might shock you for 9.

Enjoy life :)
B'

He folded it up, and put it under his pillow and laid back, hands behind his head.

"Since when did I get so cryptic?!," he murmured, sighing.

BACK IN THE PRESENT

Barry was sitting in Jitters. He'd got back from the past last night, appearing rather abruptly on the treadmill and crashing into those damn boxes again, scaring the living daylights out of Caitlin and Cisco. After a quick lie of no, the time travel didn't work, he hadn't saved managed to get the information he'd needed (which was true), he'd gotten out of there and just collapsed in bed the moment he got in. Time travel was exhausting.

Today hadn't been too bad though. No essential Flash stuff, and things at CCPD were all quiet. Barry sighed and sipped his coffee, staring off into the distance.

"Sebastian?" Barry looked up startled. There in front of him was the entirety of the New Direction people, and some of his closer friends from Dalton. He put down his coffee.

"I've got some major explaining to do, havent I?" They all nodded. He chuckled. "Well, first of all, I need you to believe in the impossible..."

Fin

A/N: Review if you feel like it. I've only just started watching Glee so if anyone's OOC... Oops

Also Smooth Criminal is the best.