*Gasp* Could it be? A lengthy chapter?!

Yep, it is. *Mentally pats myself on the back*

Enjoy!

P.S I apologize for any mistakes I make in advance.

"Are you comfortable?"

"sitting across a murder like you? no."

"Come on Sans, why can't we act like we did in the old times?"

"you know the reason." Sans growled out.

The child sighed and crossed their legs. "You know comedian, I miss the old times."

"why can't it be that way again? you know…good food, drink, bad laughs…the good times." Sans paused before saying, "heh, who am i kidding? that won't ever happen again, won't it?"

The child threw their head back and laughed. "It can't be that way because that was boring. I had exhausted every possible option. Then, I tried something new, and look where it got me."

They held their arms out as if they were presenting a grand prize to someone. "This new world is so much more exciting than the underground. So many more possibilities, and guess what? Thanks to your new band of misfits, I found out that they can avoid the same tricks, even if they don't remember. That's even more exciting. Because of the endless possibilities, I have a plan." they said with a satisfied grin.

Then, they rested their chin in their hands. "And that's where you and your precious machine come in."

Sans shook his skull. "i'm not gonna help you accomplish whatever sadistic plan you have in that messed up head of yours kid." Sans glanced disgustingly at the child in front of him. "instead, i suggest you quit. or else-"

"What?" the child asked, shrugging their shoulders. "I'm going to have a bad time?"

"heh, you wish. quit now, or else.." Sans's eye sockets darkened. "you'll have hell to pay."

"No, you're going to help me, whether you like it or not."

"or else what?" growled Sans. "what more can you do? you've killed everyone i loved, destroyed everything i cared for. i-" Sans's voice cracked before pausing in his spiel. "i wonder what happened to you. you used to be the hero, the person that was so determined to save everyone, my friend." Sans shook his skull. "now, you're just the demon in everyone's nightmare."

"I'm glad you think of me that way too. After all, isn't that so much better than being a goody-two shoes?"

Sans sighed. "we've been dancing around for too long." His eye sockets darkened. "let's just get to the point. what do you want?"

The child grinned. "Oh Sansy. You know what I want. I want to have fun. I want more to do. Even in this universe there are only so many possibilities."

Sans's eye sockets widened. Oh no, they can't possibly mean…

Their grin widened. "I see you get what I mean. Once I've exhausted every possibility here, I plan to use your machine to get to another universe. And you? Well, it's not like anyone else can operate it."

They paused for a moment before saying, "You know I never really needed your machine or you in the first place. In fact, I'll admit this; your plan worked. I was stuck in the void. In fact, I was stuck there for a very long time, just existing but not at the same time. While I was there, I thought about how to get back, on the best way to get revenge on you."

"…so you got yourself out of the void just so you could get revenge on me? wow, i must be ex-"

"Shut up comedian and let me finish." spat the human angrily. They took a deep breath before they continued. "Now, as I was saying, I was thinking on the best way to get revenge on you. Boy did I have a billion of ideas running through my head. But, I knew I couldn't launch any of them unless I got out of the void."

As much as Sans hated talking or being anywhere near the human, he stop himself from asking, "how'd you get out of the void anyways?"

They smiled. "Determination. Such a fickle thing with monsters, but humans on the other hand? Well, you know how it works. At that time, I was so determined that I ripped a hole through the void and got into this universe. At first, I was confused. Where in the world was I? Why didn't I go back to the underground? How was I going to get back? But then I learned. Soon enough, I found out that you were in this universe."

"how did you know i was here?" interrupted Sans. "when did you get here anyways?"

The child ignored Sans and continued talking like nothing ever happened. "So, I planned. I read about Midnight Barrem and decided that was my best bet. I recruited all the members in hiding and reformed the guild; I declared myself the new guild master. After that? Well, you know what happened."

Sans narrowed his eye sockets at the child. "you still haven't answered my questions kid."

They waved a hand flippantly. "Details, details. Anyways, you're going to use that machine to help me, whether you like it or not."

"why would you need my machine if you can rip a hole through time and space to get to other universes?"

"It's easier using your machine. Once I rip a hole, almost all of my determination is used. It would take months for me to get back to full capacity. On the other hand, your machine doesn't require DT to run."

"in other words, it'd be more convenient." Sans tersely replied.

They grinned. "I knew you had a brain somewhere in that thick skull of yours."

"welp, i thought you had one in there too."

They frowned confusedly. "What are you talking about?"

He shrugged. "well, you see, i would never help a murder achieve their goals, especially if they murdered my own brother." Sans's eye sockets darkened at his last statement.

They scoffed. "Don't you remember what I said before? You're going to help me, no matter what."

Sans glared at the demon sitting in front of him. "and what makes you say that pal?"

"Well-" they began while standing up from their seated position. "during the pacifist runs, I learned about everyone's strengths and weaknesses. After a few runs, I quickly figured them out." they said while making their way over to what seemed to be a computer in the corner of the room. "Take Papyrus for example, his attacks and defense are a force to reckon with. And, if he wasn't a monster, I'd say he has as a lot, maybe more, determination than me. Well, if the situation called for it anyways. But…we both know his weakness."

The room was silent after the guild master said those words. The only sound that could be heard was the typing noises on the keyboard of the computer. The human was hunched over, trying to do something. That something was unknown to Sans. However, he wasn't paying any attention to that.

The words that came out of the human's mouth only further fueled his anger towards them. He could feel his magic bubbling right underneath the surface, wanting to be released. Even after everything they'd done, they still wanted to ruin more people's lives. It was like the whole worl- no, universe was a big game to them. And, it probably was.

The human looked up from their typing. "Anyways, by the fifth run, I knew everything about every single monster in the underground…except one. Can you guess who it is?"

Sans stayed silent, but he definitely knew who they were talking about.

The child grinned. "I can see it in your eyes Sansy, you know who I'm talking about. You know it's you." they said while pointing a finger at him.

Sans's smile remained tense. He shrugged. "guilty as charged."

"Every single run I seemed to find out something new about you. It was so…exciting. I'll admit, I've never anyone quite like you Sans."

"what can i say?" said Sans while giving a shrug. He talked to the human as if he was casually talking to a friend. His darkened eye sockets however, gave away his true feelings. "i'm charming, daring, and handsome, all the way down to the bones."

"You know," the human began, "I wasn't sure about your weakness at first. At first, I thought it was your strength. You'd never attack me during the pacifist or neutral routes. I thought it was because you weren't strong enough to hold your own." then, the human gave a toothy grin. "Boy was I wrong."

"then what do you think my weakness was?" asked Sans with a bit of a challenge in his voice.

"Oh, your weakness? When I found it, I couldn't believe I hadn't realized it before. It was painfully obvious. It's the one thing that keeps you from drowning in the dark sea of your knowledge of resets. It's the only reason that you haven't given up. It's-"

Sans was tense. He knew they knew. And he knew it himself. He was the one thing that Sans would give up everything for.

"- only thing you care for. In fac-"

"will you get to point?" interrupted Sans.

"Of course. I just wanted to…play with your emotions a bit. After all, I've got all the time in the world."

Sans glared lividly at them. "spit it out."

"Ah, of course. Your one and only weakness is your brother, Papyrus. How sentimental is that?"

"a demon like you would never understand what it's like to have a sibling." growled Sans.

The human's expression suddenly turned…sad and wistful, like they were mourning for someone they once loved and cared for. However, that emotion flashed by so quick that Sans thought he had imagined it. If Sans blinked, he'd probably miss it.

"Ah…" they said while looking away. However, Sans's gaze was quickly met once again. "I used to have a sibling once you know."

Sans performed the equivalent of raising an eyebrow. The demon had a sibling? That was new. However…

"used to?" Sans had a sinking suspicion of what happened to them.

"Yes, I used to have a sibling, believe it or not." Then, a satanic grin grew on their face and their eyes became wild. "Do you want to know what happened to him?"

"nope, but lemme guess." Sans's eyes became dark. "You killed him, just like you killed everyone else."

The human waved a finger in the air. "Ding, ding, ding! And we have a winner! I killed him because he was a nuisance."

"then why do you seem sad about his death?"

The child in front of him flinched, and Sans knew he had struck a nerve. Bingo.

"Enough!" roared the child. "Argh! I can't believe I told you that!" Then, they took a deep breath to calm themselves down. They glared at Sans. Though he was always smiling, they could tell he was pleased to have caught them off guard. Then, they smiled. Why not use their trump card now? It wouldn't hurt one bit. And if it did, well, they could always just reset.

Sans knew something had changed when the human smiled. The human had something up their sleeve, and their expression was clear to anyone that, whatever they had planned would be bad. Very bad.

"Well Sansy, you've annoyed me enough. I said we should have a talk. Well, it appears that talk is over. Now it's time to get down to business."

Sans scoffed. "kid, i've already told you, i won't take part in any part of your plan." Something is up…but what?

"Oh you will…and if you don't, he gets it."

Sans narrowed his eye sockets. "who's he?"

The human turned the computer they were typing at earlier to face Sans. Sans's eye sockets went dark as he saw what was on the screen. However, his left socket started flashing a faint cyan and yellow color. His stance became tense and his hands were balled up into fists. Sans could feel his magic bubbling up to the surface, wanting to break free. But, he fought to keep it down. If Sans could have an expression of anger, it would've made even the demon cower in fear.

"You bastard." said Sans darkly.

The demon giggled a bit like a little school girl, before saying, "Ah yes. As I was saying, you will help me. Or else…" They smiled evilly at Sans. "Or else, your brother gets it."

Sans could only stare in a mix of horror and anger at the child, because on the screen, was a dark prison cell.

And sitting in the middle with a confused expression, was the only other family Sans had.

Papyrus.

Lucy raised an eyebrow skeptically though no one could see her. She was sure this plan would fail. When Alphys had explained her plan, the first part was already horrible enough, for Lucy herself especially. The second part however, was even worse. This plan was probably doomed from the beginning.

And apparently, she wasn't the only one who had these thoughts.

"You sure this will work? If it goes wrong, we'll be in even more trouble."

"Don't worry…Gray right? It will work…probably. I-I mean, there's a twenty percent chance that this will fail, but what else do we have to lose?"

"Hold on, I think you're forgetting about the twenty percent chance of failure here!" exclaimed Lucy.

"Hmm…" said Natsu while rubbing his chin. "Twenty percent isn't that much."

"Well it is if our lives are at risk! Remember who we're dealing with!"

"But Lucy!" whined Happy. "If we get out, I can finally eat some fish! I'm starving!"

"Shut up you stupid cat!"

"You're so mean Lu-"

"Shh!" interrupted Alphys. "The guards are coming back!"

The group of prisoners fell silent as the guards came marching in. As far as Lucy could make out, there seemed to be four guards. They carried no visible weapons on them, so it was safe to assume that they were wizards.

Lucy sighed. It was time for her part of the plan, and she did not like it one bit. She slowly inched her way to the bars and got into her most seductive pose. She put on pouty expression and made her eyes wide and a bit fearful.

Why does it always have to be me that do these kinds of things?

Two of the guards suddenly went eyes wide at the sight of her. The other two narrowed their eyes at her in suspicion. Lucy started sniffling a bit.

"I'm scared." she whimpered softly. "Can you please comfort me?"

This is so stupid…this plan better work.

The two guards that were suspicious of her just threw her a glare. Lucy sighed internally. She would have to up her act.

"Please." she whispered with a bit of a tremble in her voice "You can even keep the cuffs on me. I just want someone to hold me."

The two guards didn't budge. However, one of the other guards said, "Come on man. It's clear that's she's scared. Let me just hold her for a bit. It'll be fine." He even gave puppy-dog eyes to the two unwilling guards.

The suspicious guard raised an eyebrow. "Oh yeah? What if it's a trap though? Remember, these guys are Fairy Tail wizards, and their guild is pretty powerful." The other guard that shared his same concerns nodded in agreement.

The fourth guard scoffed. "First of all, they're a wizard guild. Not much of a threat if they got no magic. Second of all, they're in the heart of our guild. How would they ever escape?"

The two guards eyed the other two before giving each other a glance. They were silent. One moment passed. Then another. Finally, one of the guards broke the silent façade and gave a sigh.

"Fine, you two, go unlock the cell to let her out. Make sure to leave the cuffs on her. Remember, if they escape, this will be on you."

The two guards nodded and immediately rushed to her cell. They unlocked her cell and took the chains off her cuffs. Then, they guided her out of the cell. Lucy sat down and immediately started crying.

One of the guards sat down next to her. "Are you okay miss?"

The other guard sat down on the other side of her and gave her a hug. "It's going to be okay."

Lucy sniffled softly. She returned the embrace as best as she could with her cuffed hands. After a few moments, she said, "Thank you. I'm feeling much better now."

Then, the two guards led her back into the cell and chained her to the wall again. Then, they took their posts with the other two and went back to doing their jobs. Lucy had to look away from the two guards to keep them from seeing the grin on her face. Alphys's plan had worked.

With a whisper, Lucy said, "Open! Gate of the Bull: Taurus!"

"MOOO!"

The four guards whipped their heads around to see what the commotion was. Their eyes widened as they saw a large cow welding a large axe.

The two guards who had comforted Lucy kept switching their glances between her and Taurus. Both of their eyes were wide open and a look of shock was on plastered on their faces. One of the guards who had originally objected to letting Lucy out immediately got into a fight stance, magic crackling at his fingertips.

The last guard on left of him sighed. He muttered something under his breath, which sounded suspiciously like, "I told you so." Then he threw his hands up in the air and walked out of the room. As he stepped outside of the room, he muttered to himself, "I'm getting too old for this. I knew I should've retired years ago."

Then, before anything else could happen, the guard promptly left the guild as fast as he could. Seriously, anyone with common sense would know to leave by now. His guild mates were all idiots. Why he ever joined that guild was a mystery to him, and it still was today.

"Well, glad I got out of there." he muttered to himself. "Wouldn't want to get killed today…or any day for that matter."

Then, with a content smile, the guard started walking back home. His family would overjoyed to see him.

Back in the guild…

"H-h-how?!" exclaimed one of the guards. "You're in anti-magic cuffs!"

Lucy smirked as she raised her wrists. Right above where the cuffs sat were two pieces of metal, one on each arm. If one listened and looked closely, they could hear the quiet hum of mechanical motors from inside, and the carvings of a couple of runes on the exterior of the metal.

From behind the guards, a small whoop could be heard from Alphys's cell.

"Science bitches!"

The guard with magic at the ready narrowed his own eyes. "Science?"

Natsu gave out a laugh. "Yep! Thanks to !"

"W-well," Alphys stuttered out, embarrassed a bit. "It was nothing, really."

"How did you do this?!" demanded the guard, with an furious expression on his face.

"Well," began Erza, "first, we needed Lucy to get out of her cell."

Flashback

"So, here's the p-"

"Wait! You're THE Alphys? As in , royal scientist of the underground?!"exclaimed Lucy.

"Yeah!" Then, Alphys paused. "Wait, how'd you know that? Oh god, this is a trap isn't it? You're going to report back to the guild master and tell them my plans for escape! Ah! P-please d-don't-"

"Shut your rambling!" hissed Gray. "We don't work for Midnight Barrem."

"T-then h-how-"

"Sans told us about you." explained Erza.

"W-wait, SANS?! You know him?! Wait, how is he here?! What's goi-"

"We'll explain later." said Lucy. "Right now, tell us your plans for escape."

"Right! Um..okay. First, uh..one of you will need to convince the guards to let you out of the cell."

Gray scoffed. "And how are we going to do that? I doubt these guards will just let us waltz out of the cell. Plus, isn't this what we're trying to do? If this is your plan then-"

"No!" exclaimed Alphys. "Look, the guild master is…an old enemy of mine. They…I…never mind. Anyways, they locked me into this cell and forced me to build a killer robot for them."

"You built that robot?!" exclaimed Natsu. "Wow, that was pretty cool!"

"O-oh, thanks. I based it off a previous design of a robot th-"

"Focus doctor!" commanded Erza. "Please, continue on explaining the plan."

"Y-yeah, okay. So, when I was building the robot, I requested certain parts to build it. I also requested parts to build something that would help me escape….not they knew of course."

"So what's the thing then?" Happy asked curiously.

"They're…uh…bracelets you put on your wrists, right above where your cuffs sit. They allow you to perform magic while having those cuffs on."

The Fairy Tail wizards were surprised. Something that would cancel out the effects of the cuffs? That was pretty big.

"So hand them over!" exclaimed Natsu. "We can bust out of here in no time!"

"W-well, you're not the only ones that are chained up. Our cells are too far away for me to throw them to yours. There's a two percent chance that I would actually be able to throw it inside your cell."

Lucy's eyes lit up. "So that's why you need one of us to get out! You could hand them over to us because we would be closer to you! Then, we would be able to bust out!"

"Yep! I'm glad someone gets my plan!"

Gray frowned. "But the question is, how are we going to convince the guards to let one of us out?"

A nervous sound could be heard from Alphys's cell. "W-well…I-I have an idea. I-I got it from one of the… a-animes I watch."

Lucy raised an eyebrow curiously. "Anime? I've never heard of that before."

"What?! You've never heard of ANIME before?! I ought to-"

"Calm down lady! Yeesh, just tell us the idea." interrupted Gray.

"Right, sorry." said Alphys sheepishly. "Anyways, two of the guards that are about to come are…pervs."

Natsu grinned. "So like Gray then?"

"Shut it pyro!"

"They're easily seduced by young females. If one of the girls could…uh, pretend to be scared and want a hug from one of them, then I could hand over the wrist bands easily because you'd be close enough."

Happy grinned. "Lucy, you'd be perfect for this!"

"Shut up you stupid cat!"

"I agree, you would be best suited for this job."

"You too Erza!?"

"Come Luce, please do this for us?" begged Natsu.

"Why can't Erza do it?!" Lucy demanded.

"Because everyone knows who she is." said Gray. "The Queen of the Fairies is a pretty scary title to some people."

Lucy went silent for a moment before letting out a groan. "Okay, fine, I'll do it." she relented.

"Yay! Thank you Lucy!" cheered Happy.

"I'm not doing this for you!" she snapped. "I'm just doing this so we can escape!"

"Okay…so Lucy, here's how to activate the cuffs." began Alphys. "First, you…"

Flashback End

"…and that's how we got out." finished Erza. Then she smirked. "Lucy? Would you do the honors?"

Lucy smirked right back. "It would be an honor." Then, she pointed a finger towards the guards and looked at Taurus. "Take them out!"

"Anything for you Lucy!"

With a roar, Taurus swung his axe to the two guards closest to him. With no time to react, the guards could only put up their hands to shield their face as the axe sent them flying into the air. They crashed into the wall behind them and fell down unconscious.

The last guard rolled his eyes. "Idiots, I can't believe they were even accepted into this guild! And my partner that was actually good for something left! I always have to do everything on my own."

Then, he clapped his hands together and yelled out, "Smoke screen!" A billow of smoke came out of his hands and filled the whole room.

Lucy whirled around, trying to locate her opponent. "I can't see anything!" she yelled desperately.

"Me neither!"

"Where did he go?!"

"Natsu, can you locate him? You've got the best senses out of all of us."

"Sure, lemme see if I- HE'S RIGHT BEHIND YOU LUCY!"

With a yelp of surprise, Lucy whirled around and narrowly dodged the fist that flew towards her face. Then, in retaliation, Lucy cried out, "Lucy Kick!" and aimed a well-placed kick at the man. The kick connected with his face and knocked the man out. Immediately, the smoke started disappearing from the room.

"Nice job Lucy!" congratulated Natsu. "Now," he said as he cracked his knuckles. "Get us out of these cuffs so we can kick some Midnight Barrem butt."

Author's Note:

Disclaimer: I don't own Fairy Tail of Undertale

First Alphys, now Papyrus? Who's next? Undyne? What is going on?! Well, guess you'll have to wait for another chapter on that news.

Anyways, now we know what the human wants with Sans and his machine. Oh yeah, and the Fairy Tail gang is busting out. Welp, prepare for chaos in the next chapter. I know that it seemed a bit too easy for them to break out. After all, this is one of the most feared dark guilds in Fiore. You can't just break out that easily, especially with a master like the human. But, I assure you, it won't be as easy as that...*cue evil laugh*

Till next time!