Undertale fanfiction

UnderSwap Sans X UnderFell Sans

A/N: Me and my bff have a ship where we literally put Swap sans and Fell sans in a relationship, so I APOLOGIZE IF THIS IS WEIRD. We love it. Introducing: Coffee. XD I don't know much about the AU sans, so I apology! Since I wasn't sure how to distinguish them all, if I think It's hard to tell which AU sans it is, we shall call them as followed: Fell, Swap, Galaxy, Gaster, and Sans! I'll explain more in authors note at the bottom!

Fell looked at himself again in the mirror, assessing himself carefully. He smiled at his reflection, turning around to see if he looked okay from behind. When he was satisfied with his look, he walked down out of the house to his car. He opened the door and hopped in, the leather hot. He revved up the engine and pulled out of the driveway.

Fell let his mind take on many angles as he drove to the Starbucks. He felt his bone go a bright red tint when his brain decided to be an asshole and go strait to the point. Swap liked him. Shaking his head, Fell gripped the wheel tighter, trying to focus on not running a red light. He kept his eye sockets on the road to the best of his ability, but he couldn't help but think about it.

His phone buzzed, and being the responsible monster he was, Fell checked his texts while driving. One text from Swap.

-Can't wait to see u there! :3

Fell felt himself go a shade redder. He swiped his thumb across the keypad quickly.

-Same. If I'm late order for me, k?

-Sure. Wat chu want?

-Black coffee

-KK

Turning the corner, Fell tried to wait patiently at the red light, tapping his bone fingers on the wheel in impatience. He wanted to get there as soon as possible. It hadn't been that long ago, though, when Swap annoyed the shit out of him. That was before the ever so fateful night when he had walked to the park with Galaxy and passed a muttering Swap. He hadn't noticed them there and continued to speak aloud, and it took the other two a while to realize he was reading aloud as he wrote. In his diary. It was awkward, especially when Galaxy made a face of either confusion, disappointment, or disgust. Maybe all three?

Fell himself was probably a bright red at that moment, but it's hard to tell when all you can focus on is another person, or monster. He had fallen pretty far in love with Swap at that point, but he absolutely refused to admit it, out of fear of disappointing Galaxy or anybody else.

The light finally changed to green and he continued to move on to the Coffee place excitedly. The barrier of fear of letting others down didn't prevent him from secretly loving... well... himself. Wow, narcissist much? He pulled into the parking lot and hopped out of his car. While the skeleton walked up to the double doors of the Starbucks, he tried to compose himself and calm his blush. Looking around, he scoped for the other skeletal monster, whom he found in a seat to the back, writing in a journal, head rested on his hand. He looked so peaceful that Fell almost didn't want to go bother him, yet he still did.

He walked over slowly, trying to give Swap the chance to put the book away. He didn't want to embarrass the bugger. Unfortunately, the other didn't notice him until he was within seeing distance of the book. "Hey." Flopping down across from him, Fell grinned. He pretended to ignore the book and looked out the window at the bright sunlight pouring through. "Ugh, too bright outside." He flashed another smile at Swap.

Swap turned a bright blue and shoved the book down next to him on the squishy seat. "Y-Yeah!" He nodded to emphasize his point. Fell suppressed a laugh. God damn Swap was adorable when he got embarrassed like that.

"Anyways, you already order?" he looked around at the Cafe itself. Very few people or monsters were there, which may be a good thing. He rested his head on his hand.

"Y- Yeah. I got you black, like you asked. I- I got a milk!" He smiled at the other across him, a beam of sunshine to Fell, though he could never admit it. He closed his eyes to block out the light, from both Swap and the window.

"Good. We can't have another one of those incidents, can we?" Fell peeked one of his eyes open and raised and eyebrow- bone?- playfully. Swap turned even bluer.

He played with his gloves and looked down at the table. "N- Nope! No more caffeine for me!" He laughed weakly, obviously holding in many emotions. His blue face stared at his lap, which only made Fell turn a small shade of pink.

"Hello, boys. Coffee." A waitress set the drinks in front of them and walked off to go take another costumers order.

Fell immediately grabs the cup and downs a large gulp. Fuck cream and shit, he needed a distraction. Swap took a more tentative sip of his milk, looking at the ground still. "S-So you want to head to the park after this?" He looked up and smiled brightly. Gah, more beautiful sunshine.

"Sure, sounds cool." Another gulp of coffee. He tried to keep his cool, but Fell was never very good at getting it back once he had lost it. He stared into the black depths of his cup, trying to avoid all eye contact.

"So did you read that book yet?" Swap tried to divert the attention from the awkwardness of that situation, which thank god it worked.

"Oh, yeah! It was pretty good, I- I mean, for a book." Fell laughed.

"I knew you would like it!" Swap beamed again, taking a large chug from his milk. He lowered the glass and stared at Fell as he burst out laughing, covering his face with his jacket sleeve.

"Y- You have a mustache." He snorted.

"W- What!" Swap grabbed some napkins frantically and wiped his bone, setting them on the table when he was done. "That's awkward." He let Fell finish laughing before speaking up again. "Thanks, though." He smiled.

"Anytime, you goof." Fell uncovered his face, red from laughing. He took another drink from his coffee, finishing it off with a smile. "You ready?"

Swap nodded, finished off his milk, and left his tip on the table before grabbing his journal and standing up. "Onwards!"

Fell just smiled as the two skeletons walked into the fresh morning air, having it sting their bones. "Geez! I forgot my coat." Swap groaned with annoyance at himself.

Fell looked at him. Swap was gripping his arms, looking quite irritated. He thought for a moment before taking his own coat of and handing it awkwardly to Swap. He looked away and scratched the back of his neck, blushing furiously. He had a long sleeved undershirt, so the cold was no problem. "H-Here. I don't need it. And you never dress appropriately."

The coat was taken from his hands, but he still didn't dare look at Swap in case he was looking at him as well. He knew he was red as shit.

"Thanks. Hm! This fits pretty well!" Fell heard some rustling as his other self put on the coat. "Sleeves are a little long..."

Composing himself, Fell looked at Swap, swearing that if he blushed, he'd punch himself. Swap fit in it pretty well, although his hands barely poked out from the sleeves, and his face was buried in the fluffy rim of his hood. "You wear it well, kid." He muttered. "Anyways, we were going somewhere?" He smiled.

"Oh yeah!" Swap started skipping in the direction of the park, humming to himself. Fell fell behind, watching the other enjoy life. He couldn't help but get red at the thought of the other wearing his jacket. It was almost like he was hugging him. A comforting thought. He flushed even harder.

"You okay? You're not cold, are you?" a curious Swap poked his head up from out of nowhere, causing Fell to almost collide their faces. He stopped walking.

"I'm fine!" He attempted to smile reassuringly. He failed.

"You lie." Swap poked his cheekbone, making an angry face. He did, although, move out of the way so that they could keep walking.

"W-Why wouldn't I be fine? What makes you think I'm not?" He looked away at the road, watching the cars pass him by. Suppressing the urge to blush, he turned back to Swap. He was not successful.

"You're red as a tomato." Swap observed his face carefully. "Possibly more." He grinned. "What is iiiiiiit?"

"N- Nothing!" He looked back at the street. "I was just thinking..."

"'Bout what?"

"Y... Yogurt?" Fell inwardly cringed and hoped he could get by on whatever the hell that was.

"Gross dude. Yogurt is gross." Swap made a disgusted face and stuck his tongue out at Fell. Fell laughed and hoped he would let it go.

Fell attempted to salvage whatever cool composure he had and show it on his face, so he tried to make his blush go away. It eventually did and he was left with the want to bite his own tongue off in frustration. He attempted to smile at all of Swap's jokes, and he did try to listen, but he couldn't really.

He was to focused on Swap himself. He looked at the other out of the corner of his eye, a large blush threatening to reform. By the time they actually reached the park he was ready to punch himself in the face.

"I wanna go play on the spinney thing!" Swap grabbed Fell's arm and pulled him along to the merry go round.

"No! Not the spinney thing!" Groaned Fell in fake agony.

"You can sit on that bench then!" Swap pointed to a bench that sat nearby, just within talking distance. Fell obediently sat down and watched Swap spin on the merry go round like an idiot. He felt a little chuckle rise up as he watched the child-like him spin over and over again. "THIS IS THE GREATEST."

"Don't fall!" He leaned back and took in the situation. He was at the park, with the idiot he loved that also just happened to be himself. He was watching this other him spin around on a merry go round, screaming with joy, and this him also wore his jacket. God damn, he must be insane. Fell raised a hand and rubbed his forehead.

"Whew!" A sweaty Swap flopped down next to him, panting slightly. "You okay? Do you have a headache? Or a fever?" He looked over at Fell, who just forced a weak smile.

"Nah, I'm good. What 'ya doing? Ready to go back?" He laughed.

"Nope! You just didn't look good so..."

"Thanks, but I'm fine, really!" he smiled again. He hated to worry Swap, but he couldn't exactly go: 'Hey me. I fucking love you.' now could he?

"...Gotta go. I had fun! Bye." Fell looked up. He had been to lost in his own thoughts to notice Swap was leaving.

"Hm? O- Okay! Bye, love you!" He stood up and smiled at Swap, not even noticing what he had said until Swap froze up. Shit! Shit shit shit shit shit!

"Uh... Oh shit." And with that, Fell the genius decided to turn tail and run the fuck away. Without his jacket, mind you.

Fell leaned over his steering wheel, in his driveway. He looked at his hands. Not only did he feel empty without his jacket, but he also decided running away was going to solve the problem and not make things worse. Maybe he could blow it off as an 'I love you because you are me' thing, although he highly doubted he could. His phone buzzed in his pocket. He pulled it out, not really even needing to check the caller ID. It was going to be Swap. He let out a sigh and answered the phone.

"H- Hey..." He muttered.

"Hey... You left your jacket with me. Can I come by later to drop it off?"

"Y- Yeah..." He let out a breath he hadn't realized he was holding. "See you then. Text me the time, I guess..." he shut off the phone and tossed it in the passengers seat. He looked up at the sky, feeling stupid. "This is a stupid thing to get worked up over, Fell. You know that." he muttered to himself. He sat up and grabbed his phone, got out of the car and went inside. Sitting on the couch he turned his phone onto full volume and lay there, scrolling through some random music before settling on his favorite and closing his eyes, phone on the coffee table, which was covered in books, papers, and like, ten coffee mugs. He stared off into space, eyes half opened, wondering what he was going to say. Maybe he could play it off? But he wasn't that mean. You can't get his heart up like that, and then just say nope.

He sighed and rolled over so he was looking at the back of the couch, curling into a fetal position. After a few minutes of curling up, he got bored, so he went to the kitchen to make some coffee. He waited by the kettle while it heated up the water and poured it into his mix of coffee powder and cold water. He stirred it until it was mixed and took a huge chug, not caring if he burned his tongue. "I fucking hate everything," He murmured to himself.

"That's no surprise." Fell jumped and turned around. Swap was standing there, balancing himself on one hand on the kitchen counter. He looked hurt. Really hurt. FUUUUCK.

"W- When did you-?" Flustered, Fell put his coffee on the counter.

"You left the front door open, stupid." Swap laughed and placed a hand on his forehead. "Here." He tossed the jacket under his arm at Fell with a grin. He caught it.

"Thanks." He set the jacket on a chair by the table nearby. "Anyways... uh..." he scratched the back of his neck, looking at the yellow tiles of his kitchen.

"Why did you run away?" Fell jumped. He didn't want to confront the problem at hand, but it looked like he had to...

He sighed and leaned over the counter, cradling his skull in his hands. "Because I'm a fucking idiot." He breathed out into his boney fingers. "I run away from problems I don't want to confront." he looked back at Swap, whom was looking at him with both empathy and sadness, but something else. Something hidden under some restraint in his eyes.

"Let's just forget it." Fell raised himself and picked up his coffee, taking a sip. "I'm sorry." He looked away from his other, face red.

"I don't want to." Fell turned around to look at Swap, whom was fiddling with his gloves again, looking at the ground with a blue face. "I don't w- want to forget you said that."

Fell grinned a little. "Neither do I..." He looked back at his coffee mug, which his hands were gripping tightly. "But we kinda have to."

"Why?"

Fell chuckled a little. Swap didn't see it. God how lucky he was. "We're the same person, stupid."

"No we aren't." Fell looked up, surprised. "We're completely different. Just because we all share the exact same genes or whatever doesn't mean were the same person."

"We're both Sans." Fell pointed out. He didn't know why he was trying to keep him away. Was he really that scared of being shunned?

"No. We're both extensions to a sort." Swap smiled at him, looking up. "And even if we are the same person, what's wrong with a little narcissism?"

Fell laughed quietly. "I don't know, bud. This could end bad..." He looked at the ceiling.

"What about the good times in between?"

"Heh. Yeah, maybe." He looked back down at Swap, who was furiously blue. "But still." He sighed.

"I'm gonna go. W- We need to sleep on this... See you later." Swap turned around and left. Fell stood there at the kitchen counter with a cold cup of coffee, waiting there long after he heard the front door close. He turned to his jacket and picked it up. Something was pressed inside one of the inner pockets.

Fell pulled it out. It was a small journal. It was Swap's diary.

A/N: HOLY FUCK. OMG. OKAY. OKAY OKAY. OKAY. OKAY. OKAY OKAY OKAY. Yes, so lemme just show you the undertale Au's or Sans:

Swap: A more innocent and childlike Sans. Very hyper.

Fell: Bad ass dude with and attitude XD

Galaxy: Like, outer Space sans. His AU is like, centered in outer space or something.

Gaster: I have no idea. I may not use him in this fic, but I'm gonna put him here just in case

Sans: Come on. Do you even Undertale? Sans is the sexiest of all living things! * NYEH *

I would post pictures but I don't want any artists to get mad or something, so just look them up yourselves please!

Thanks for reading. I hope they aren't too OOC!