Frisk couldn't sleep, even while she was with Sans she remained wide awake.
Looking at her hand, she felt, afraid, it became too much, she needed to write, to focus her thoughts, the silence was worse than any kind of ear bleeding noise for her.
"Sans? You awake?"
"Mmm…"
He wasn't, of course he wasn't, why would he be, it was in the middle of the night in the underground.
Frisk left him and headed to her journal, bringing it back with her to the sleeping skeleton, as much as she hated this silence she didn't want to be left alone, she took up a stance against Sans with a knife she didn't know was in her hand…
What else would she do if left alone…?
Writing down the number of days, Frisk logged the events, what she did, how she felt, and stopping on occasion, feeling that, presence, here.
But something happened… something that she wished hadn't, a nightmare brought to life.
The door was broken down as a few monsters came rushing it, looters, they were armed with knives, swords spears…
They noticed Frisk, but not for what she was. A pair of them rushed to her, while another pair rushed to Sans, waking the skeleton.
"Uh, kid, what-"
He stopped, noticing the cold metallic blade right in front of his skull, and the monsters that were starting to look their stuff.
"Look pal-"
"Shut, Shut up! Try and stop us, than, than I'll, I'll kill you!"
That did not sit well with Frisk or Sans, but mostly Frisk, he could see her hands twitch when they said that.
"Alright, easy, we won't get in your way, just, please don't hurt her."
She was surprised and he could see it, but Frisk noticed a very small nod in her direction, she returned the nod and looked away.
The looters carried on for several seconds before one of them, a reptile type monster headed straight to Sans with a particularly annoyed mood.
"WHERE IS THE GOODS!?"
"Goods? We haven't got anything el-"
"Don't lie to me!"
Sans said nothing but that was the wrong thing to do.
The monster pulled out a custom made knife, slightly curved with several jagged hooks on one side, it could easily cut into anything, but pulling it out was going to cause serious damage.
"Look I'm not lying."
The monster stepped away from Sans and headed to Frisk, the monsters holding her down changed their grip on her, making it easier for Sans to see her and for the monster holding the strange knife to slash her open.
He raised his knife, telling sans that he had one last chance.
"WE DON'T HAVE ANY-"
Not the reply he was looking for…
The monster brought the knife down on Frisk, intent on killing her…
Stopping when Frisk smiled and laughed loudly…
She broke loose from the hold with ease, slamming the pair into each other as she backed off, afterwards she engaged the monster with the knife, slamming her open palm flat against the monster's stomach.
Despite her size she applied more than enough force on impact, the monster started to fall onto its hands and knees, she kicked the knife out of its hand, sending it up into the air before delivering a punch against the monster's cheek, sending it to a side only to have her deliver an uppercut that appeared to form straight from the floor itself, it seemed like the force from her own attack carried Frisk up, alphys would have probably confused it with a move named Shoryuken from a video game.
As she started to drop down Frisk grabbed hold of the knife, spinning it in her hands to have the blade pointing down, descending onto the monster, she slipped the cold steel through the heavy scales on the monster's head…
It faded to dust after that.
She didn't stop, instead, Frisk carried on, killing the two that grabbed hold of her, only stopping when she was threatened.
"Tsk, you think that comedian is my friend?"
Of all the beings in the room, Sans was the most shocked at that question, he was unsurprised at how easily and efficiently she disposed of the ones holding him down, that question was consuming him.
"Ha, well, I find his presence more tolerable than yours…"
She bolted to the others, slipping past them like she was part of the wind, sending slain monster dust in all directions without taking as much as a scratch.
This little human girl easily dodged their knife strikes, sidestepped the lunges from their spears, even bent down all the way to allow their sword swipes to slip right across her face, placing her hands behind her and flipping back up to her feet, in one fluid motion.
She was a nightmare, masterful acrobatic prowess, excessive parkour talent and pin point hand eye coordination, the looters didn't last long against her as she taunted them, laughed at their failure, and in the end, cut them down, like they were nothing, like they were merely, standing still.
"F, Frisk?"
She looked over to him, he could see an expression on her, one that unnerved him, she was annoyed.
But a smile quickly returned to her face as she looked at him.
"Comedian…"
"Frisk what-"
He couldn't say anything further, Frisk bolted forward, taking advantage of his moment of weakness, delivering a very well placed blow to his jaw with her knee.
He fell back and was about to get back up but Frisk was first, she was right over him, holding the knife over him.
"Hold still, comedian."
He didn't dare move, it would take one light thrust through one of his eye sockets to end him, but she didn't kill him, instead, she did worse.
Frisk held his skull down with her open hand while she cut into his forehead, marking him,
He couldn't do anything but feel the pain of her cutting into his skull, he tried to fight back but she delivered a single kick to the side of his jaw, enough to disorient him but not kill him.
…
"There we go comedian, enjoy."
She kissed the marking she made on his forehead before delivering a blow strong enough to knock him out.
"I'm still not strong enough comedian, be glad."
She giggled before holding his hand, the hand that delivered so much pain to her, she gently placed it down before ramming the knife through the bone, lodging it into the floor, his hand was pinned into the wood and it wasn't going to come loose.
She only giggled before gripping her head in pain.
It lasted for only a moment before passing, leaving Frisk gasping for air.
"Sans?"
She looked up, seeing the skeleton in such condition.
"SANS!"
She panicked and tried to wake him but knew, it was pointless, she had done this.
She looked around, seeing monster dust lying everywhere, even on her own hands,
She could only get one clear thought out.
"RUN!"
And run she did, bolting straight for the door, stopping when she saw the massive blizzard outside, she turned around and grabbed one of the heavy coats lying in the dust, she didn't even bother to shake it off as she ran out and put it on over her torn up sweater.
Sans woke up, days after the incident.
The skeleton felt a throbbing pain in his skull and instinctively tried to bring his hand to his skull but he felt a more intense pain from his hand.
Turning to see what it was, Sans was surprised, to say the least when he saw the knife holding his hand pinned.
"What? Ugh, what hap-"
He remembered.
Frisk, went mad.
He screamed in anger, flinging curses out in all directions, pointed straight towards him and his stupidity.
The skeleton tried to free his hand but it didn't budge.
Trying to ignore the pain Sans focused, releasing his magical eye and summoning up a Gaster Blaster he fired straight down, obliterating the knife and doing serious harm to his hand.
After the blaster faded away Sans got to his feet, his hand hurt badly but, he needed to look around, make sure she wasn't there.
On his look around he saw her journal, maybe, maybe it had some answers.
He opened it, and flipped through the pages.
As he read through everything he became more and more confused, it simply didn't make sense.
Who was 'She?'
And why did 'She' appear everywhere?
He closed the book, more intent on finding her now than ever before, only to stop when he saw what she did to him in a mirror.
He raised his wounded hand up to feel the mark, it was definitely there.
'Sans + Frisk'
There was a heart around the mark.
The pain in his hand, the memory of her slaughter, the 'gift' she gave him, all of it, sealed his decision as his magical eye returned, burning brighter than ever, searing the inside of his eye socket from the energy and heat arcing off inside the socket.
"I am going to KILL that BRAT!"
Several Gaster Blasters formed, their shape unlike anything he had ever summoned up before.
A pressure built inside Sans, his crushing rage growing ever stronger at the thought of Frisk until, the walls keeping it in check, caved.
For a split second a dark purple ring formed in Sans's other eye socket, like a sign that, everything that would ever have made him hesitate, any past feelings he ever had for her, whatever hope he had for her to change, everything that kept him from crushing her soul in the first place.
It all gave way, ending Sans and giving birth to a skeleton out for vengeance, no concept of pity, no idea of mercy, a living, breathing force of death, locked solely on Frisk.
"Run Kid, cause when I find you, I'm sending you to hell."
The blasters fired, obliterating everything, leaving nothing more than a smoking crater where the house once stood.
Sans stood on top of one of the Blasters, he allowed himself one last look at the crater where his house once stood.
The purple ring formed again for a split second… a sign that all his attachments, his feelings for Papyrus, Undyne, Alphys, everyone, they were severed.
Laughter filled the space between life and death, it had worked out better than ever.
"She was so weak, and he is so angry, ah this feels amazing wouldn't you agree?"
No response came.
"Ha-ha come now, where is that prideful praise of Sans hmm?"
…
"It doesn't matter, he won't find her, until it's too late."
The laughter returned.