Alright, fine! For those who want the happy ending, here it is! Now, leave me and my body parts alone Lunar_Dreamcatcher!

Anyway, I see "Two Birds on a Wire" as the main theme for this AU, mainly because of these lyrics...

"I'll believe it all, I won't let go of your hand."

Chaos always believed in Nightmare and she refused to listen to the other villager's options of him, she refused to let go of him and she preferred to stay with him, on that "Wire."

Nightmare always believed that he would always have Chaos by his side for as long as she lived, she would always be there for him. She would always be on that "Wire" with him.

"...But he is a liar."

This is Nightmare, because he lied about his bad feelings about Chaos leaving the village, he didn't speak up, he didn't say anything and he didn't tell her about it, so, when Dream ate the apples, he knew that he was too late, he should have spoken up and said something to stop her from leaving.

"There's nothing that I won't understand..."

This is Chaos, because she would always listen to Nightmare when he spoke to her about anything, even if he wanted to rant about Dream and the villagers because she understood how he felt about them.

"The sky is overcast and I'm sorry."

This is when everything that he knew came to an end for Nightmare, when the sky was overcasted and Chaos couldn't be there when he needed her the most, she couldn't even say that she was sorry to him for that, because she was dead.

"Two birds of a feather, say that they're always gonna stay together."

They promised that they would always stay together, Chaos promised that she would come back and get her necklace back from Nightmare but she didn't come back, she broke her promise, leaving Nightmare to hold onto his scattered world.

"One tries to fly away and the other..."

Nightmare had to run away from Dreamtale and Chaos? No one knew what had happened to her. She never came back to the village.

                                   ----------------------------------

She was an Swap!Sans with a difference, this Sans had brown ghost hair. She belonged to one of the many Swap!AUs scattered across the Multiverse.

And from a young age, she had been haunted by nightmares, of a life that she had lived before, as a human.

The Swap!Sans kept her real gender, the name that she preferred and her nightmares a secret, her Papyrus had a bit of a controlling personality, he never turned it towards her, as long as she played the part that he wanted her to play. He had accepted a long time ago that Sans would have hair.

She wanted to go home, she never felt the Family Bond with Papyrus, she knew who had the bond instead.

Nighty, she missed him so much. She had to find a way back to him.

This wasn't her home.

The human was a breath of fresh air, both Chara and Frisk were nice to her, but they did have a bad habit of doing genocide runs when they were bored. Sans was never hurt much during these runs, mostly because Sans had learned that it was quicker and easier to just let it happen.

All three of them knew that they were trapped in this endless maze of Resets and Timelines, so, they might as well just stop trying to fight it, go with the flow and have fun with it.

Papyrus remembered too, but Sans never told him that she remembered, she occasionally pretended to have a case of déjà vu whenever she met the human but she would it brush it off afterwards. Papyrus wanted the Resets to end, because they were starting to interfere with his control and that made him uneasy.

It also meant that Papyrus started to become more mean and angry at everyone and not even a plan to just stop resetting and just live on the surface for a few years helped.

He just got angrier and even more mean, and eventually, he Dusted Sans during a Genocide route, by pushing him off of a cliff in Hotland.

The incident brought everything back to the Swap!Sans, no, it brought everything back to Chaos. She remembered everything!

The human Reset that timeline and in the new one, Sans moved out of the house that he shared with Papyrus once the human had reached the surface.

Papyrus was not happy about that, but that's when Sans dropped the bombshell, revealing to Papyrus that she was a girl, that she was sick of his crap, that he wasn't her brother, that she remembered everything and enough was enough.

"I refuse to be your puppet Papyrus." Sans told him. "I am done being your little toy and I'm going to find my real brother and keep a promise that I made to him a long time ago, I have someone waiting for me to come back. Don't bother me ever again and leave me alone."

She slammed the door on her way out, walking through Snowdin, where many Monsters had been waiting for this day for quite some time, they knew that Sans would eventually snap and move out from Papyrus's control and start all over again somewhere new.

Sans really did take that to the limit, she changed her name, her style of clothing, her style of hair and she often walked around with her ecto body formed, choosing to move halfway around the world, to Japan, once the issues of Monsters rejoining the surface world were figured out.

Chaos loved Japan, she was finally free to be herself again, years passed, and she soon reached the age that she was when her first life came to an end.

She often sent letters and gifts back to Chara and Frisk who kept her informed about what was going on back home.

Apparently, they were part of something called a Multiverse, because a few years after she left, Chara and the others met another skeleton called Dream.

Chaos couldn't help the shiver that went down her spine when they told her that.

Dream...

It had been a long time since she thought about that Annoying Sunshine Idiot, she hadn't seen him since that day, so she could be forgiven for the spit take that she did with her tea over her monitor when she saw the photo of him that Chara took for her.

Because when did Dream go through puberty?! The information that Papyrus was trying to join Dream's group, Justice Reigns, was just as worrying...

And Dream's goal of getting rid of all of the negativity in the Multiverse, what the hell had he been smoking?! Getting rid of all of the negativity in the Multiverse was impossible, because it was in everything and everyone, it was a part of them.

Chara and Frisk had learned a long time ago that to deny each other was impossible and it just caused a lot of pain and sorrow in the future, it was better to learn how to get along with each other. Dream had not gotten the memo about that when it came to positivity and negativity.

Chara then told her about three of their most wanted fugitives, they had been given Wanted posters for all three of them. Chara was still laughing because their greatest crimes were being pranksters and pranking Dream and his group. Chara wanted to exchange tips and prank ideas with them.

Chaos got to see the Wanted posters, the one with the tearmarks reminded her of Undyne, the one with the red scar on his cheek was hot and she wasn't afraid to tell Chara that through the video chat that they were doing, but it was the final one that caused her to fall out of her chair.

"Nighty?" She asked, reaching out and touching the monitor's screen.

"You know him?" Chara asked her.

"Do you remember what I told you and Frisk about 'Before' for me?" Chara and Frisk were the only ones who knew about her past life. "That's him, the guy that I promised that I would come back for."

They were silent for a few seconds before Chara continued to update Chaos on what was happening, but the news about Dream still bothered her, even after the video chat ended.

She decided to let things play out and to see what happened next, she had been out of the loop when it came to her original AU for quite some time.

She later got a message from the Queen that caused her to silently seethe in anger, Papyrus had gotten himself into a lot of trouble with Dream's right hand man, another skeleton named Ink.

It was so bad that Papyrus was being transported straight to JR's main headquarters to be sentenced and as the only member of his family that was still alive, even through their friends had made it clear that she had cut her ties with him a long time ago, she had to be there.

So, Chaos packed everything up, placing everything in her inventory space, handed in her notice for her apartment and her job, and headed back to Chara and Frisk.

She was not happy that she wasn't even allowed to strangle Papyrus for his actions. She found herself waiting in Dream's office while she waited for Dream and Ink to finish booking Papyrus in. She was bored.

She was grateful when the alarms went off, she had something to do! She followed the sounds of fighting and laughter, even screaming, only to laugh her head off when she found the tearmarked one running from Dream and Ink, wearing one of those hula girl costumes.

She went down the passageway where the group of skeletons had come from, the skeleton with the red scar was trying to pick the lock of a cell, that had another skeleton in it, who was wearing a very familiar circlet.

"Nighty..." Chaos muttered before she took a deep breath and stepped into his line of sight.

                                     ----------------------------

Cross turned around when he heard footsteps behind him, to find a Swap!Sans staring at his Boss. This Swap!Sans was different, there was something strange about him, and Cross wasn't talking about the long brown ghost hair that he had.

"You're picking that lock wrong." The Swap!Sans told him.

"Oh, it's not like you can pick the bloody lock." Cross fired back, only for the Swap!Sans to smile.

"Can I try? Please?"

Cross sighed, this was the last thing that they needed.

"Oh, come on, can I have a go, please?"

"Alright, fine, you can have a go!" Cross snapped, handing the lockpicks over to the Swap!Sans. "But you're taking the blame if things go wrong!"

"Okay!" The Swap!Sans bounced over and he started to work on the lock, humming as he did so.

Cross kept an eye out, until a click came from the lock.

"I did it!" The Swap!Sans said as he removed the lock. "The Annoying Sunshine Idiot really needs to get some better locks. This one was too easy!"

Cross couldn't help but laugh at the name that the Swap!Sans had given Dream but Nightmare was shocked.

Because apart from him, only the creator of that name for Dream knew about it, so how did this Swap!Sans know about it?!

The Swap!Sans was about to turn to look at him, when an explosion went off.

"I think that we should get out of here." Nightmare said, he could worry about this later.

"Agreed, come on Boss, let's go!" Cross yelled, only for the Swap!Sans to coo at Nightmare.

"Awwww! Nighty, you've found more minions!"

"Shut up Chaos!" Nightmare yelled, only for him to slam his hands over his mouth once he realised what he had said.

"You remember me!" Chaos yelled, scooping Nightmare up into a cuddle. "I thought that you had forgotten about me!"

"Damn it Chaos! Let me go!"

"Noes! I must cuddle you and hug you! I have years of physical affection that I must catch up on!"

Cross dropped his knife, he had heard about Nightmare's first minion, and Error had heard about her too, but wasn't she supposed to be a human and why was she a skeleton now?!

"We can have a cuddle pile when we get home." He eventually said, after he picked up his knife.

"Cross!" He heard Nightmare yell. "You traitor!"

He shook his head and he started to lead the way out of the cell block, passing by a cell that had a Papyrus in it.

"Sans! Put down that criminal!"

They all stopped to look at the Papyrus and Chaos just sighed. "There isn't anyone with that name here." She snarled. "Oh wait, I forgot, I stopped going by that name a few years ago, when I cut ties with you!"

Nightmare looked at Chaos, who actually had dropped the friendly, happy look that a lot of the Swap!Sans were well known for, she actually looked upset and angry.

"And as I told you before, you are not my brother, even if we are related by bone and Magic, you were never my brother. I never even wanted to be part of the Royal Guard but you signed me up without my consent or permission.

I am not a toy that you can throw to the ground and leave alone to gather dust when you get bored Papyrus, I have a mind, emotions, the ability to talk and the ability to think, feel and choose what path that I want to follow and if you really were my brother, then you would have accepted that, and you wouldn't have Dusted me by pushing me off of a cliff in Hotland, into Lava, when I disagreed with you, even if I should thank you for that. You helped me remember what I forgot, by killing me the way that I was killed in my first life, without the lava."

Nightmare gasped.

"Goodbye Papyrus, I hope that you rot in that cell of yours, because I am not coming back to save you. I have found my real brother and we have a lot to catch up on."

Chaos walked on ahead, carrying Nightmare, with Cross catching up to them.

"The villagers killed you..." Nightmare eventually said.

"I don't know about that." Chaos told him. "If he was acting on his own, or they actually planned it, but I'm sorry. I wasn't there for you when this mess started, when you needed me..."

"You can't change the past." Cross spoke up. "But you can change the future, you're here now, right? You came back to him, you could have chosen to stay out of this mess but you choose a side, even though it could mean that you'll lose everything, you came back and that is what you should be proud of."

"Yeah." Chaos said, smiling. "Come on, let's pick up the other minion and go home."

"We might need to pick up a shovel on the way back." Cross was smirking.

"Why do we need a shovel?" Chaos asked as her eyelights turned into question marks.

"Well, because of..." Cross leaned closer to where an ear would be on Chaos, noticing that the Swap!Sans was a little bit shorter then him, before he started to whisper.

Nightmare blushed since he could overhear what Cross was telling to Chaos, he dug out his phone and he quickly texted Error.

'Hide the shovels when you get back!'

'Why?'

'Just hide the shovels Error, I'll explain when we get back!'