To me you're acting like you're twins.

Mark and Oliver Fischbach. They were your neighbors ever since you were in elementary school. As kids, they got into mischief together and were almost impossible to tell apart, but as they grew up, stark differences between them popped up, and now as you and the Fischbach twins were going into your senior year of high school, the only way they were related was by looks. Which Oliver changed as soon as they turned 18, decking himself out in piercings and tattoos as well as getting colored contacts. Mark kept his glasses on over his brown eyes, and the only semblance of change in his appearance when he turned 18 was that he tried out a few different hair colors on his floof. But they always made him more adorable, not as punk and Oliver was. Or at least claimed to be.

Come senior year, you hung out with both of them, but for the most part, separately. Oliver had his group of punks, delinquents, and the occasional pothead, but no matter what, his tattooed, dyed-hair friend Sean was always with him. Mark floated between jocks and nerds, but no matter what, his smart, nerdy friends Bob and Wade were always by his side.

Where you fit in was strange. Oliver and Mark hung out just fine at home, you three loved playing video games and studying together, which Oliver sometimes objected to. His friends may be future dropouts, but you and his brother made it your mission at home to make sure he graduates high school. But at school, they weren't mortal enemies so much, but just ignored each other whenever possible.

The only time it was impossible was when you were there with both of them, which was when you slyly managed to get them both involved in a friendly conversation. Sometimes, it didn't always work.

You were digging into your locker with Mark waiting patiently by your side, since your next class was together. "I don't know where my AP Chem binder is!" You huffed, frustrated. "I put it in here before first period!"

"Maybe you left it at home?" Mark suggested, peering into your locker as well.

"No, I remember putting it in here with Oliver this morning. For some reason, he was very eager to watch me open my locker." Then, it dawned on you. "That little shit."

The familiar, smug voice of Mark's twin brother sounded from behind you. "My ears are burning."

You both turned to look at him, you shaking your head as you spotted your purple chemistry binder in his hands. "You broke into my locker!"

Were you all that mad? No, Oliver didn't do anything maliciously, just to annoy you a little bit. He looked mildly offended. "I would never! I merely memorized your combination and made a return trip during first."

Mark spoke up, more annoyed than you, bordering on angry. "You'd be able to do so much if you used those smarts for something instead of skipping your classes to pull a prank on Y/N!"

"I didn't skip, I asked to use the bathroom!"

"Please tell me you washed your hands before handling my binder." You stepped forward to grab it, but Oliver held it over his head. Narrowing your eyes at him, you begrudgingly hopped up to get it, but Oliver still held it out of your reach.

You sighed, not willing to deal with childishness right now, and looked at Mark pleadingly. Mark reached forward to get your binder, but his brother side-stepped him, that shit-eating grin on his face. "Give it, Oliver, we've got to get to Chem!"

"You may have to, but I have U.S. History, and you know how much Mrs. Abraham loves me, she never marks me absent."

"Mrs. Abraham is blind, she wouldn't be able to tell if you were there or not." Mark looked about ready to punch his brother, his hand balling into a fist.

You weren't about to let a fight over your Chemistry binder happen, so you stepped between them to face Oliver. "What do you want me to do to get my binder back? Within reason."

"A kiss." The tattooed boy said, and at your glare, he added, "on the cheek."

You shrugged, and got on your tiptoes to give him a peck on the cheek, much to Mark's objections. In your mind, you knew that Oliver would turn his head to get a kiss on the lips, so when you felt his head turn, you ducked down and shot up to grab your binder. He seemed surprised at your cunning as you put your backpack on and walked down the hallway with your purple binder triumphantly in your hand. "Better luck next time, Olly." You called over your shoulder. "Now come on, Markimoo, we've gotta get to Chem!"

Oliver didn't seem upset that you wormed your way out of the kiss, but instead was grinning wide at the nicknames you called him and his brother.

"Why do you put up with him?" Mark huffed, sitting down next to you at your lab table.

"He's my friend, and also your brother, so you should put up with him too." You scoffed eyes scanning the whiteboard to see what the lesson was today. "Ooh! We're getting our info about our Unknown Lab!"

At this, Mark perked up and the interaction with Oliver earlier was forgotten as the teacher began handing out the lab packets. After AP Chem, you walked into the lunchroom with Mark, talking excitedly about the tests and such you would do on your samples, already making guesses based on color and consistency. You sat down with your packed lunch as Mark went into the lunch line.

Your lunch table group consisted of Mark, Mandy, Bob, Wade, you, and another girl named Signe. You typically sat between Signe and Mark, because you and Signe had art together after lunch, and she always tried to help you out with the concepts and such. Which you didn't quite grasp, but you appreciated her help nonetheless. She packed her lunch as well, so you were the first two to sit down, and she immediately pulled a sketchbook out of her backpack. You felt someone sit on your other side, and you turned to say hi to Mark, surprised that he was out of the line so early, but you were met with the grey-blue eyes of Oliver's colored contacts.

"Oh hey Olly." You smiled, popping a chip in your mouth. "How was U.S. History?"

Oliver seemed genuinely happy that you were being friendly with him, and he started delving into the quite interesting class Mrs. Abraham had today.

"I wish she would be that cool in my class!" You complained. "I swear she hates AP students more than the idiots in your class."

He mocked offense. "Are you calling me an idiot?"

"Yeah, you're an idiot for not taking AP when you could totally keep up with the work."

"But then Mrs. Abraham would hate me."

"Aw, would you miss your 84-year-old girlfriend, Olly-cakes?" You teasingly called him the nickname you heard her call him one time as you ruffled his black hair, and he wrinkled his nose for a moment.

"Not as much as I'd miss my 18-year-old friend that is a girl." He said, and you listened for a hint of sarcasm, but it wasn't there as he too messed up your hair.

You swatted his hand away as a grunt of frustration sounded from your left, and you looked over at Signe who had Sean sitting beside her. Their relationship was complicated. Sean flirted with Signe by annoying the living crap out of her, which she didn't appreciate very much. His green hair fell in his eyes as he leaned down to look in her sketchbook, which she promptly closed.

You were about to jump in as he tried to gently open it up again, but she grabbed a pen and nearly stabbed it into his arm. She could handle herself against this nuisance of a boy. "Go. Away. Sean." She demanded, and he nodded in assent, standing up to walk towards the cafeteria door.

You leapt up after the boy, and grabbed his inked arm before he could walk away to sulk by himself. "Sean, can I give you some advice?"

He stopped, looking at you, clearly waiting for this advice.

"Do you really like Signe?"

"Yes."

"Truly?"

"Yes." Sean said, the emotional distress apparent in his eyes and his voice. "I like her so much."

"Then show her. Don't just annoy her for any attention you get at all. Say something nice to her, compliment her, get her something nice. She doesn't think your flirting is legit because you hide everything behind your loud jokes." You explained. "She'd say yes if you showed her something real about yourself."

Oliver's friend nodded, drinking in your words. "Okay, thank you. Do you think she would let me sit down with her again or should I try later?"

"Do it now. Ask politely to see her sketches." You turned around to lead the way back to the table, and this time Sean grabbed your arm.

"How do you know she'll say yes?"

"Clearly you haven't seen her sketchbook. Half of it is different views of you. The back of your head in your English class, your profile in the lunchroom, and when you put your glasses on in Calc. She's crazy about you, when you're not driving her crazy."

Sean had a faint smile on his face as he released your arm to follow you back to the table. You sat beside Oliver as Sean quietly asked Signe if he could sit next to her. Without a sound, she nodded before returning to her sandwich. You focused your attention back on Olly and saw him munching on your Cosmic Brownie.

"Why are you always taking my stuff?" You sighed, grabbing the half that was sticking out of his mouth.

"Maybe it's because he gets so little female attention that he strives for any, even if it's negative." Mark's voice said from above you.

He was standing behind his brother, clearly angry that his spot got taken. "Well that's just mean." Oliver replied through the brownie in his mouth.

"Chew, swallow, then speak." You chastised him, pushing his bottom jaw up with your hand.

"I took AP Psych, trust me." His brother said smugly. "Now can I have my seat?"

"Of course, dear little brother." Oliver stood up, bowing cordially then added, "You know, when I was your age, I didn't get upset at such frivolous things."

"You mean six minutes ago?"

"Precisely." Oliver kept up his royal air. "Goodbye, fair maiden."

He bowed to kiss your hand, and you had to hold in your wild laughter at his antics. "See ya later, knight in rusted armor."

"Low blow, Y/N."

You grinned, waving him goodbye. He was about to call for Sean, but he and Signe were in a deep conversation about a TV show. Mark took his seat, and picked a pepperoni slice off as the others slowly joined the table too.

"Was that Oliver?" Bob asked as he sat next to Mark.

"Yep, annoying as always." He replied.

"He wasn't that bad this time, Mark." You elbowed him in the side.

Your friend merely rolled his eyes in response, taking a bite of his pizza. Both he and Oliver were acting strange, and you were determined to get to the bottom of it.

((would y'all want this to be a 'choose ur own ending' type thing? where one chapter u end up with oliver and the other you end up with mark? or do you only want mark?))

((also, potc au will probably be finished after this, sorry!))