Hi, this is my first fan fic upload so if it's not very good I'd like to apologize. Also this contains spoilers for the end of undertale so if you don't want to know what happens think of a BLUE STOP SIGN and stop where you are. Also as a side note I know that Frisk/Chara is genderless but i gave them a female pronoun to make things easier, so please don't get upset by it.

She wants to spare? After all she did, she's choosing to spare?! Sans felt sick, he had just watched this child kill hundreds of innocent monsters, watched her kill his brother, and she asks for mercy?

"*Kid…. GET DUNKED!"

Sans watched as Frisk was beaten and broken again, how many times has it been now? He doesn't care any more, the only thing left for him to wonder is why? Why did this child that saved them all, lead them all to a happy ending reset the world just to kill them? Was she always this evil? Does she just see them as her toys to play with? It doesn't matter any more…

"..."

Still alive, too broken to move, softly sobbing.

"*Just reset kid, then we can do this song and dance a hundred more times."

"..."

"*Then did you give up? Finally sate that bloodlust?! Happy with the lives you already took! Or are you done because it's not as fun as you thought it would be! Did killing your friends turn out to be a bad time!"

"..."

Sans walked to where Frisk was on the floor, as he reaches down to turn her face and look at her, he realises she's already was no reset…..

"*hahahahahahahahahahahahahahahaha!"

Sans looks up to see another child standing at the edge of the room, clutching and laughing like they heard the best joke ever.

"*Who are you?"

The child continued to laugh, but as it continued it no longer sounded as if it carried mirth but rather held a cold chill that crawled up Sans spine. The kid slowed her laughing, as she did so Sans got a better look at her; her appearance was unsettlingly close to that of Frisk, with only minor differences, but while Frisk used to give an air of kindness this girl…. she gave had an aura of cruelty.

"*Hi Sans, my name Chara. I'd like to thank you"

"*Why…?"

"*Why? Because no matter how hard I tried Frisk held onto hope, no matter who I made her kill she stayed determined. Even after all the piles of dust we made she was convinced she could reset it and stop me."

Sans could feel his heart drop as this "Chara" continued to talk.

"*When we finally got to you she hoped she could get you to help. See, every time we died and reset I would lose a little bit of power over her for a while; the first time she found this out was when we fought Undyne. Heh, i was actually a little worried with her but in the end she wasn't an issue. But you, well you actually got us to the point where I lost control, and Frisk was herself again…. But when she tried to stop the fight and begged for your help, what did you do?"

"I… But… you… she…"

"She has had no control, she was forced to kill all her friends, and when she finally had control again she was brutally beaten to death by one of the only people left that she cared about. That's right you murdered the child that freed you and every other monster, and all you managed to accomplish was break the last of her DETERMINATION, finally letting me take her soul to fix mine."

"*Then why…. why did she reset at all!? If she was really so good why did she reset after giving us a life we could be happy with?!

"*Ooooo, what's this? Looking for a reason to justify your actions? The reason she reset was that not every monster was happy on the surface because of issues they had underground, and Frisk thought if she reset and helped them, then followed the same route as last time she could make everybody happy. Well…. imagine her surprise the first time I took over, and forced her to bash a frog's head in with a stick, or even better when I made her kill that stupid goat, it was beautiful getting to kill the bitch that raised me and listen to Frisk beg me not to do it. I have to admit listening to Frisk beg me not to kill everyone was a lot of fun, but her constant attempts to reset were really annoying. But that's because she didn't know how resets work, whenever someone shows up with more DETERMINATION than the last person with reset they lose the ability. But you already know that don't you Sans, since you could do it before, at least until Asrie- sorry I mean Flowey, arrived and overpowered your ability to reset, then Frisk overpowered Flowey, and I overpowered Frisk."

Sans looked down to Frisk, was she really just trying to make things better but this… abomination took control and forced her to do this? He tried to think back, through all the times he had lived through this world had he ever heard of Chara? He could feel as if somewhere he remembered a warning, but who warned him and what the specifics were he can't remember. Sans looked down at Frisk's broken body and could feel tears welling up.

"*Sorry kid… looks like I messed up…"

"*Yep."

Before he could react he felt a knife cut through his chest knocking him down. There was red seeping from the hole, what it was didn't matter. Sans knew he was dying, so he got up and decided to do the only thing he could do.

"*I'm going to Grillby's'…"

An empty hope to find comfort in place he could never reach… but at least it was something. As Sans looked up he saw his brother looking at him, with a look of expectation.

"*Hey Papyrus, you want anything?"

Sans felt a small hand grab his, when he looked down he saw Frisk holding his hand. Sans realized that even if he died, he wouldn't be alone, so he left with his brother and this small human, even if there is never another reset... they'll be happy.

…

Chara watched as Sans turned to dust, while she was happy that he was finally dead it annoyed her how he was smiling at the end. It doesn't matter she thought, she'll still go and kill her brother and the king, then take the souls. Once she takes the souls she'll find the evacuated monsters and kill them too, then she'll leave and live as a god…. All according to plan.

If people like the story I do plan on writing an extra to this taking place after the end of the genocide route, so let me know what you think, and whether or not i should upload the second part.