The First Battle...

[Undertale OST: 100 - Megalovania - YouTube]

As soon as GO sounded, I look towards my Father who is standing in front of his throne. the face of Father turned into maniacal smile. He stepped forward with one foot, instantly appearing in front of me as he charged his kick.

All my senses screamed to dodge. I ducked under his kick, putting up a bone wall between us and getting some distance. [You feel like your gonna have a bad time.]

*Not the time, Sans!!*

[Heh.]

Father immediately unleashes his quirk, sending a stream of Dragons forwards.

<Gaster Blasters>

*Vrrrrrrrr*

*FWOOOOOOSH*

I block the attack of the Dragons with the beam of the blasters, they cancel each other out. Father used it as a distraction to get into my face once again. In response I use my <Blue Attack>

"Heh, let's see you dodge this."

I say as I shift his gravity backwards, sending a stream of Gaster Blasters all around. I block off his path with bones in every direction. Instead of being hit by the blasters, he smashes through the bones with sheer strength alone and summons a Dragon to ride on. The Dragons mouth opens wide as it shoots a beam very similar to my Gaster Blaster. I side step the Blaster with ease.

He jumps off the Dragon, ready to attack. In response I simple point upwards to the ceiling, shifting Fathers gravity.

"This might... Upset you a little" Sana says as Father starts to fall upwards.

<<<<<Gaster Blasters>>>>>

*****VRRRRRRRR*****

*****FWOOOOOOOOOOOSH*****

Along with an attack from blasters in every direction, I trap him in a prison of bones, made out of ribcages. He punches one of the Bones only to look at his hand in horror. He couldn't break through.

"You should know that Ribs have alot of magic. They make a great shock absorber" Sans says with one eye closed and a beaming smile, she snapped her fingers firing the beams.

As the beams enclose onto Father, he's completely trapped. He tries to use his quirk but the Gaster Beams overwhelm him too fast. As the Beams subsides, he is sitting there with his eyes glowing brighter. My burning blue eyes contrast with his yellow as I have a smile on my face.

"Now... Your REALLY not gonna like whats gonna happen next." She says as she slams the gravity back to normal and then constantly in every direction. Wearing him out slightly.

He regains his ground as his eyes glow brighter than they ever have before. He materialises a sword. I guess Dragons wern't his only options. He jumps into the air, leaping towards me. He slams the sword down. I side step it, making the sword slice through the ground next to my feet.

He regains his balance as he begins to slice diagonally, upwards, sidewards in every direction, using his footwork to make me lose my balance. I stumble backwards only to put myself into a rolling motion, recovering on my hands and knees. I throw my hand up and continue to fire a stream of bones that rupture from the ground.

As he cuts through them, he continues to jump forward with his weapon, I get an ominous feeling and <Teleport> to the side of him. If I had just stood there and took it, the sword would have went straight through my chest.

"Heh. If you take another step, then I'll be forced to use my special attack" Sana says with a comical shrug. [My Special Attack doesn't work in this world. What are you thinking?]

*Who said it was yours?*

...

Father jumps towards me as I feel the sweat crawling on my back. I have to finish this soon... He is too fast, too powerful and still hasn't gotten serious yet. "The only limit is my imagination" Sana said as she used her [Bones] Magic and shifted her tone. [Bone Creation: Bone Scythe]

As she said that, she grabs the thin air, pulling a bone bo staff out nowhere. As she plants the Bone staff on the ground and motions her hand at the top of the staff, slowly transitioning it to have blue glow at the end of it, turning it a magic scythe blade.

Gigantic bones appear out of nowhere, constantly striking him as the gravity is shifted until she slams the gravity back towards her. As he falls, he prepares his sword and she prepares to slash with her scythe.

She aims for his stomach until something strange happened. Everything turned black and white, Father was gone and in its place was... Sans?

*What is this?!*

*Sans? Speak to me!*

I look down to my Scythe only to notice it's now a knife. My arms are moving on their own...

*Slice*

"Heh, didja really think you would be able-"

-9999999999999999999999999999999999999999999999999-

I feel a massive pain in my chest. I look down to see a cut and look back up to see the kid with a knife and terrifying grin on his face, a grin of victory. *No... No! Stop!! This isn't real! I WAS DONE WITH THIS! THE CYCLE IS GONE!* Sana shouts, her voice can't be heard but it was clear she was crying her eyes out.

"So... Guess thats it, huh?... Just... Don't say I didn't warn you. Well. I'm going to Grillby's."

As I begin to walk away, I see the figure of my Brother. "Come on Sans, Hurry up you Lazy Bones NYEH HEH HEH!!"

"Papyrus... do you want anything?" I say to him before I drop to my knees, with a smile.

...

"Dad! What's happening with Sana!"

"Call the Physician!" He says with an extremely worried tone. Sana can be seen constantly convulsing on her bed. Tears feel her eyes as she continuously repeats to herself...

"'No... No it's not me.' 'Break the cycle...' 'Papyrus...' 'No no no no'"

...

[Kid. KID! Wake up!] He says in a fearful tone. He knew what was happening yet couldn't do anything about it.

"Why... Why does she have a scar?" Mother asks in an extremely worried tone.

"Was it an assassin? It can't have been, it wasn't there a few days ago and it looks as if it's been healed for years."

"What's happening?!" She says as she turns to the royal physician with tears in her eyes.

The Physician looks down at the scar. It large cut on her chest. After a second, she said, "Well this scar doesn't seem new. It's atleast a year old. Do any of you know how she got it, it looks as if she was slashed with some kind of weapon."

"NO! That isn't possible. It can't have been a week old! Now that I think about it, if any of the maids saw it whilst dressing her, they would have reported it straight away! CALL THE MAIDS IN!" Mother shouts with extreme anger in her voice.

[They won't know what's happening, our memories are the same. The power of Imagination can break this universes laws if Determined enough... That can be either good or bad. Kid you really need to wake up soon. Alot of people are worrying about you.]

__________________________________________________________

[A/N]

Short chapter today, only 1000. I only wanted this battle to be for a chapter. If the battle continued she would had 100% lost. She got a few hits in but she couldn't put up a fight good enough to make him use his full quirk, he didn't even scratch the surface of it. In a sense he was just playing around, his quirk is much more powerful than Ryuko Tatsuma the No. 9 Hero.

If they clashed her bone scythe would have been broken and she would have been stabbed through. But it was hard to think of that as an ending to this fight. So instead, you have her having PTSD, imagining herself as if she was the one holding the knife and the one who was being stabbed by it. I think it would better help put more depth into her character, idk.

Sans has the memories of every timeline of a person who has played undertale in the real world. (That's the problem with inheriting memories) Idk if you enjoyed this chapter. I just hope you did.

(Btw Cartiliage is something that makes joints help with shock absorption but because Sans and Papyrus can't summon or have cartiliage, they replace it with magic to keep themselves together.)