Glee and Flash Crossover

CHAPTER 1

"I don't like you", Kurt bluntly told Sebastian, giving him a look that could curdle milk.

"Fun. I don't like you either", Sebastian replied. Oh it was on. Kurt hated the way Sebastian shamelessly flirted with Blaine and the fact that he was so confident he was going to beat New Directions at Nationals and get Blaine at the same time.

This happened a week ago and he had to endure Sebastian's stupid face in the Lima Bean all the time. It was like Sebastian lived there, always drinking his fancy coffee with his wannabe Disney Prince haircut and classy Dalton Academy blazer. He sighed as he sipped his coffee silently across Blaine, Rachel, Santana and Finn. He hadn't seen Sebastian today in the Lima Bean yet. He wasn't complaining because he could do without a day of drama. Before he could finish the thought, Sebastian suddenly walked in and Kurt couldn't help but groan. Blaine noticed the source of his groan and alerted the rest of the group.

"Maybe we should get out of here. I don't need him to patronize us anymore this week", Blaine told the group.

"No. We can't just leave every time we see him. He doesn't own the place. Let's just mind our own business. He doesn't seem to be noticing us", Kurt replied. He suddenly realised what was so weird. Sebastian didn't even look over at them which he always does, especially at Blaine and he seemed a little off. He wasn't wearing his usual Dalton blazer and his hair was somewhat shorter and ruffled. He somehow looked a little older and worn out for some reason. Kurt frowned.

"Does Sebastian seem a little off to you?" He asked the gang.

"He's Sebastian. Everything about him is off", Santana replied snidely.

"No. No. Look at him. He seems…I dunno…lost?" Kurt countered. Something was going on here. Sebastian was looking around as if he'd never been to the place and he looked disoriented. He didn't see the barista walking behind him carrying a pot of hot coffee and before Kurt could shout out a warning, Sebastian walked right into her and the scalding coffee spilled everywhere. Sebastian yowled in pain but immediately started apologizing profusely to the waitress, offering to help clean up. Something was really off.

"OK. You're right. Something IS off. The Sebastian we know is pretty composed and isn't that apologetic", Finn agreed as Rachel nodded. Something happened to him. For some reason Kurt felt sorry for him. He got up and made his way towards Sebastian.

"Hey Sebastian. What has gotten into you? Lost your composure?" Kurt replied with a chuckle. Sebastian didn't respond, he was busy wiping the coffee stains off his jacket. Kurt frowned. "Sebastian!" Kurt called again loudly and finally Sebastian looked up with a startled look.

"What? Yeah sorry…I uh…yeah?" He replied, a little flustered.

"Are you alright?"

"Yeah. Yeah I'm good…uh…thanks...sorry…I'm a little dazed."

"Uh-uh," Kurt replied. Something weird was going on. "Hey, do you wanna come and sit with us?" Something was wrong and Kurt began to suspect this was one of Sebastian's tricks to catch them off guard and do something to them again but he had to find out what was going on.

"I…uh…yeah ok…sure," Sebastian replied as he made his way with Kurt to Blaine, Santana, Finn and Rachel. All them looked taken aback. Kurt gave them a look and pulled up a chair for Sebastian. He still looked a little disoriented as he noticed everyone giving him hateful looks.

"Uh…hey guys," he said awkwardly with a half-wave. Everyone gave him cold suspicious looks.

"What's the matter with you, Fievel?" Santana remarked. Sebastian looked taken aback.

"Fiev- I don't…um…I'm sorry, you guys seem to have a problem with me," He noticed.

"No kidding. You're damn right we do. What's wrong with you huh? Is this one of your tricks? Are you gonna assault us with rock salt slushies again? What's the deal?" Finn asked, looking at Sebastian suspiciously.

"Look guys…I'm sorry…this is all a misunderstanding…I just- "Before he could finish his sentence a pretty waitress with dark skin came over with a jug of coffee

"Hey you guys need anything else?" Before anyone could reply Sebastian suddenly stood up.

"Iris? Oh gosh! Iris hey! I need to talk to you!" Sebastian replied breathlessly. The waitress, Iris, looked a little taken aback.

"Um…I'm sorry…do I know you?"

"Iris stop playing games, its important, can we meet at S.T.A.R Labs later? Bring Joe along. I know you're mad at me but it's important," Sebastian said. If Kurt hadn't known better, he swore he might've seen something more than familiarity in Sebastian's eyes when he looked at Iris. It was exactly how Kurt looked at Blaine. He frowned. Sebastian was gay wasn't he? And what in the world was S.T.A.R Labs?

"Look Mr…I'm sorry I've never met you in my life. If you don't have any orders, I have to go," Iris said as she walked away. Sebastian had a confused look on his face.

"Wha…this doesn't make any sense…unless…oh no…not again, "Sebastian muttered to himself as he ran his fingers through his hair. He turned towards them and something that looked like realization hit his face and he seemed pained by it. "Guys…uh…I have to go. See you later," He muttered as he rushed out of the shop.

"What's the matter with him?" Rachel asked with a confused look on her face. Just as soon as she muttered those words, Sebastian reappeared in the shop, this time with his usual blazer, coiffed hair and condescending demeanour. He spotted their group and strode confidently towards them.

"Hey Blaine. Hello everyone else," He said with his usual evil smirk.

"What was the matter with you just now? How did you get changed so fast?" Finn asked

"What do you mean?" Sebastian asked with a frown.

"You were acting all clumsy and confused and stuff."

"I think the stench of your depressing public school has addled your senses. I just walked in," He said, smirking. "Anyways, just wanted to wish you all the best for regionals. Don't feel too bad when The Warblers destroy you," He continued.

"Yeah we'll see about that," Rachel countered. Sebastian smirked and strode calmly away.

"That guy is just plain weird. He's definitely planning something," Finn remarked. Kurt silently agreed

CHAPTER 2

Barry knew he screwed up big time. Well technically it wasn't his fault he was stuck in another universe in another Earth. Again. He just remembered running really fast, pushing his limits and he didn't expect to reach such speeds but apparently he did and he managed to break the dimensional barrier and end up on a different Earth. Again. He didn't notice anything different until he realised Iris didn't recognize him and those high-school kids he met started calling him Sebastian, which meant he had an Earth…4… counterpart. He had to figure out a way to get home and he couldn't do that if there was two of him walking around. He had to find this…Sebastian. He didn't have to wait long because not long after his exit, he saw his doppelganger exiting the Lima Bean. His red Flash suit under his jacket and jeans had enough tranquilisation darts to put out a horse. He silently thanked Cisco for his insistence on extra protection. Just in case. With his super-speed, he sped over to Sebastian and injected him with enough sedatives to keep him out for a day. Sebastian didn't even notice a single thing. "Sorry", Barry muttered under his breath as he dragged Sebastian's form to a locked storage area behind the Lima Bean. He used his speed to break open the lock and carefully lay Sebastian beside some bricks. Barry took Sebastian's student ID and exchanged his jacket for Sebastian's blazer and made his way to the Lima Bean. He had to find someone who could help him or he'd be stuck here forever. Suddenly, he saw a group of guys wearing the same Dalton Academy blazer he had on, exiting the coffee shop. He decided to follow them. Unfortunately, they noticed him.

"Hey Sebastian, Glee club practice is cancelled today, "said a guy with blonde hair.

"Uh…right. Yeah. Thanks." Sebastian replied as he followed them to the school. Apparently it was a boarding school, which was convenient because he didn't have to find somewhere to sleep and it was getting late anyway.

As soon as he reached the fancy school, he immediately made his way to the computer room. He had to find out if this Earth had a S.T.A.R Labs. Unfortunately, he couldn't find any S.T.A.R Labs, which he expected. He sighed sadly, how was he ever going to return home? He made his way to the dorm and figured out where his room was. Of course he seemed off to most of the guys he shared the dorm with. He checked his watch, he still had about 12 hours until the real Sebastian woke up. Tomorrow was the weekend which was convenient because he could then find a solution to his massive stuck-on- a- different- Earth problem. All he could do for now was wait.

Barry woke up bright and early before most of his "peers" woke up. He found some sort of booklet documenting the rival glee clubs and found a group called the New Directions. He saw pictures of the high school kids he met earlier who seemed to hate him. Fortunately, they had their names on the booklet and he made sure to learn all their names just in case he met them again at the Lima Bean, which he was going to visit again to check on Sebastian.

He made his way to the Lima Bean storage area and found Sebastian still laying there peacefully. He felt extremely guilty but Sebastian would be fine. He injected him with another dose which would keep him out for at least another 12 hours. The worst the darts could do was give the sleeper light nightmares. He walked to the front of the shop and he noticed a crowd of people gathered around something. There was a squad of police cars and police tapes everywhere.

CHAPTER 3

Kurt wanted a normal Saturday morning, sipping coffee with Blaine at the Lima Bean. Unfortunately, that was probably not going to happen. Apparently, there was a break in at the coffee shop, though, who'd wanna rob a coffee shop was beyond him. There were police tapes everywhere and people were gathered outside the shop. Kurt and Blaine were soon joined by Santana who was just as surprised as they were at the commotion. There were two detectives talking to the waitress, Iris who seemed to have a cut arm. Suddenly Sebastian came running to them, calling out to Iris. Kurt couldn't help but overhear their conversation.

"Are you ok? Are you hurt? What happened?" Sebastian asked frantically. Iris seemed taken aback. So was Kurt. Why did Sebastian suddenly care so much about this girl? He didn't so much as notice her existence in the Lima Been before yesterday.

"Yeah I'm fine. I wasn't here during the robbery. My cut arm…just an accident, kinda tripped on the glass," Iris said a little embarrassed.

"Oh. You tripped on glass? That's…kinda funny," Sebastian said and smiled. Iris smiled back but then her expression turned to confusion.

"Look. I really don't know you. I mean, I've seen you around quite a bit but you've never said so much as a word to me. I appreciate your concern but this is a little confusing," She replied.

"Right. Yeah. I just care about you. I mean, you as in the general population. I'm not saying I don't care for you. I care for you in a totally human to fellow human appropriateness of general caring," Sebastian bumbled, looking unsure of himself. Iris chuckled in spite of herself. Kurt frowned. Sebastian seemed to be so out of character. He was a total dorky, bumbling mess. Kurt exchanged a look with Blaine and Santana. They seemed to have the same thought he did.

"It looks like there were a few of them. Can't really tell, we've gotta wait for the CSI. Judging by all the broken glass, they must've used a crowbar or something," One of the detectives explained.

"Actually, judging by the shape of the broken glass, they used their fists, the fact that there's no blood is what's disconcerting…" Sebastian said with a frown.

"And who might you be?" The detective asked sceptically.

"Oh I'm no one of importance but once your CSI gets here, he or she will confirm what I said. The glass was broken using a fist. There was only one robber…" Sebastian started as he walked into the Lima Bean. Kurt and the others were astounded. How in the world did Sebastian know so much? "…look at the dirt on the floor. The robber came from some sort of construction site or it could be a military camp and there's only one set of footprints. Hmmm…nothing's missing," Sebastian continued.

"Nothing's missing because the alarm was tripped, kid. The robbers turned tail and ran," The detective said with a smirk. His partner chuckled beside him.

"No. No. Based on the type of alarm used, it takes exactly 5 minutes for the police to get here. They knew where the money was- in the cashier- and they had approximately 3 minutes to get all the money and run. 2 minutes to make it out without getting caught but instead, once the alarm was tripped they immediately fled," Sebastian said

"Look kid, the guys were probably stoned and just chickened out when they heard the alarm. That's enough of playing cop," The detective said getting annoyed.

"Actually, it was a girl, judging by the shape of the footprints and shoes. And if she was stoned, why in the world would she rob a coffee shop? There's a jewellery shop just a few blocks away. No, this was done to get attention. But who's attention?" Sebastian replied deep in thought. The detectives frowned at him.

"Okay. That's enough. Get away from the crime scene before I arrest you and- "The detective started before being handed a report by the CSI that just finished evaluating the scene. He frowned because he didn't notice the CSI and did not want to admit that he was quite intrigued with what the kid said. He read through the report and frowned even deeper. Everything the kid said checked out. The only explanation would be the kid wasn't a kid and was a fully trained CSI instead.

"It checks out. What you said checks out," The detective said in astonishment. Kurt shared his astonishment. How did Sebastian know this?

"Who are you? The only explanation would be you're a fully trained CSI. Are you? Which department are you from?" The detective asked with narrowed eyes.

"I'm just a smart guy who's interested in criminology. I have to go…uh…my parents would be worried, "Sebastian replied, walking away. Kurt was not about to let this go. He grabbed Sebastian's arm as he passed him by.

"How did you know that?" Kurt asked.

"Uh…I read a lot and I watch a lot of CSI. It's a little obvious really," Sebastian replied but Kurt did not believe him for a moment. Then Santana said what everyone was already thinking.

"Look. Whatever you're up to, if you're up to your usual tricks of trying to sabotage our glee club again, I don't care what happens, I will punch you in your smug little face," Santana said staring Sebastian right in the eyes. He looked surprisingly taken aback.

"I'm not planning anything. So you don't have to worry about that. I have to go, "Sebastian said as he backed slowly away from them. He seemed so out of character. Something was definitely going on.