A/N: As I played Undertale, I viewed Frisk as more of a female CHARActer. Since I view that Toby Fox left Frisk a mute genderless child as an opportunity for the player to create their own story for them, that's what I did. This same reasoning also applies to Chara.

I do not own Undertale. All rights and names belong to Toby Fox (except my personal character :D)

"Sit down, little ones, and let me tell you a wonderful story. The Tale of Man and Monster."

"Long ago, two races ruled over Earth: Humans and Monsters."

"One day, a war broke out between the races, and after a long battle, Humans were victorious."

"Driving the monsters Underground, the humans sealed the monsters with a mighty spell, one that could never be broken without the combined power that matched those seven mages."

"After many, many years, humans had all but forgotten about monsters, with all that remained of their legacy being tales. Tales of Mount Ebott, the mountain that towered over the massive populous that was Ebott City."

"Tales of children climbing the mountain, never to return."

"The first of these children was Chara, the human who hated humans. She climbed the mountain to escape from her home, and she found a new one, with Monsterkind, and with the Dreemurrs, the royal family of the Underground. She befriended Asriel, the child of Asgore and Toriel, the King and Queen of monsters, and for a year, she was shown a glimmer of happiness, of joy, while Monsterkind celebrated, for they now had hope, hope for a brighter future that lay within Chara and Asriel."

"But Chara was an empathetic child, and she could see and feel the pain that Monsterkind was going through, having been locked Underground for so long. So she made a plan with Asriel, one that ended up costing the lives of both Chara and Asriel, once again sinking Monsterkind into despair."

"And Asgore, after losing both of his children, declared war on humanity, stating that any and all humans that fell Underground - including children - were to be killed, or captured and brought to him. This disgusted Toriel, and she left one night, never to return."

"More years passed by, and eventually, after six more human children had been slain and their souls captured, one child, a little girl, climbed the mountain, and fell deep underground, discovering the wonders that lay within.

"Here, she met many creatures, and made so many new friends - Sans and Papyrus, the skeleton brothers that lived in Snowdin Town. Undyne, the Captain of the Royal Guard, who the child managed to show that not all humans were evil. Alphys, the Royal Scientist, who the child helped give the courage to step forwards and be honest about her mistakes, while showing her that everyone deserves a second chance."

"She met Asgore, the King of Monsters, who she showed that, despite his atrocities against the innocent, even he was deserving of Mercy."

"And, she somehow managed to shatter the barrier that had held Monsters Underground for so long, setting them free and saving an entire race."

"But that was a very long time ago, and in a different timeline. For now, we shall see what happens when a new variable is added to the mix. This tale is not the tale of Men and Monsters, the one with a happy ending. This tale is full of horrors unthinkable. This tale is of betrayal and redemption. Of pain and love. The story didn't end with one girl coming to the mountain, the tale continued when a pair of twins, a male and female, climbed Mount Ebott, seeking to escape...

"Run, Frisk!" Harley yelled to his sister, seizing her hand, and led the charge out of the cover of the trees, sprinting up the dark mountain, the barking and howling of the hounds behind them mixing with the shouts of the men.

They ran through the undergrowth, bobbing and weaving through vines and thorns, doing their best to shield their faces as the thorns tore into their hands and arms.

They ran higher and higher until they finally reached a small cavern at the top.

"Whoa!" Harley shouted, skidding to stop as he reached the entrance of a large pit. Frisk almost barreled right into it, but he caught her around the waist and hoisted her up.

"Thanks." She said breathlessly.

"You're welcome" Harley responded curtly, and looked towards the exit, hearing the howls of the dogs. He then glanced down at his twin sister, a scowl crossing his face as he saw the grime that covered her purple and yellow sweater, of which was doing a very poor job at concealing her thin frame.

"Frisk." He whispered, scanning the caves around him - this was a dead end. "Frisk, are you hurt?"

Frisk turned, gazing up to allow her pale red gaze to meet his darker red ones. His clothes were just as torn as hers, and she winced as he turned from her to glance back at the rear of the cave - his black and white sweater was torn, and that scar… Ugh. She couldn't focus on that.

Instead, she shook her head, reaching up to pull a leaf free from Harley's jet black hair, then spoke.

"No." She replied softly. "No, I am not; but I don't know what we are going to do. You know that if they catch us again…"

Harley shuddered, shaking his head.

"That won't happen." He swore, and as the howls of the hounds grew closer, he spotted a large branch on the ground, scooping it up and holding it out in front of him.

Frisk stepped behind her brother, her thin frame easily concealed behind his larger one, and peeked out from behind his shoulder.

"Harley, we…"

"No. I refuse to let anything happen to you while I -"
"I know." She replied, her voice still soft. "But let's just face it - this will just end in a painful death for the both of us, right?"

Harley didn't reply, instead tightened his grip on the branch; so Frisk just pressed forward.

"Look, we ran up here trying to disappear, following the urban legends of all those kids. So, instead of being the first ones to return safely from the mountain, how about we just... disappear?"

Harley's hands trembled as the howls of the hounds grew closer; and he turned, facing Frisk. "Meet our end, in our own way." Harley said slowly. "Defy these assholes one last time." He grinned humorlessly. "Might as well, right?"

Frisk grabbed his hand. "Right."

"Not a moment to lose." He responded. "Frisk - I wish I could have been -"

"No, stop that." Frisk growled, cutting him off. "You have been the best sibling I could have ever asked for; and I know that our lives have been short, but I wouldn't change them for anything if it meant not having you."

Harley blinked, his gaze dropping to the floor. "Sixteen years…"

"And we pushed through it all together." She replied firmly, releasing his hand and pulling Harley into a hug.

Harley's eyes welled with tears as Frisk began to sob into his chest, and he stroked her hair.

"I love you, Frisk."

That made Frisk sob louder, but she stepped back, grabbing onto his forearms, and he to hers, gazing up into his eyes, the howls and voices growing louder and louder.

"Ready?"

Harley pulled his sister into his arms again, and nodded.

"Ready."

And together, the two tipped over, falling into the mountain as they held each other tight, closing their eyes as they prepared for the end.

An end of one story, the beginning of the next chapter.

A/N - Changed my mind. The entire story is going to be slowly updated with some direct scenes removed in place of more tactful implications of what is going on.

Enjoy!