The Departure Chapter 1
OK, I wrote this for a school project thing, but then it turned into a fanfiction, so that's why it's on the short side (we had a four-page limit).

'Would you like a coffee or something Alphys?' said Catty, striding in confidently.
'O-o-oh yes, Catty t-that would be lovely.' replied Alphys, stuttering as usual. She was even more nervous than she usually would be, since so many people were depending on her device, this little cube with a million wires attached at the top connected to a piece of wire bent into a hoop shape. It looked like something a child would make as part of a game, for goodness' sake! However, that little cube was in fact the core of this entre device, being basically a magic version of a battery. She had made it months ago, before this whole mass murder of everyone in the Underground. The magic she had used was Sans', since that was far more powerful that anyone's that she had ever seen except Asgore and Toriel's. It should work…

Chara glared at Frisk. They had given Frisk their body back for one minute and they had already died to Sans after sparing him. As if Sans would even consider sparing them after all he knew they'd done. They'd killed nearly everyone Sans cared about and still Frisk thought that Sans would spare them! It was a miracle they'd even made it through the 5 minutes Toriel left them alone. Still, Frisk thought like her. Kill or be killed. Maybe they knew that Sans would kill them and were going to do it all over again! That would be perfect to torture him with. Kill his friends and family over and over and over again! How long would it be till he went insane? 'You knew he was going to kill you, right Frisk?' asked Chara.
[Yes.] signed Frisk as a reply.
'So you wanted to get killed?' responded Chara.
[Yes.] signed Frisk again.
'It was so we can go back and do it all over again, right? Right?'
[No.]
'What?'
[I don't want to do that again. I can't kill Mom again! I can't face Undyne the Undying again! I barely made it through Papyrus!]
Chara smiled even more at the memory. Papyrus was weak, and easy to kill. But he still 'believed' in them. Frisk had been sobbing in the corner for ages about it. 'You still made it though.'
[Doesn't change how I felt about it.]
'It doesn't matter how you felt it. You don't need feelings.'
[You're soulless. Of course you would say that.]
Chara rolled her eyes. 'OK, yes I'll give you that. But why. Are. You. Arguing? Why are you only stopping me now?'
[I was trying since you killed Mom! Just because I failed doesn't mean I wasn't trying!]
'I hate you.'
[I know you do. You hate everyone.]
'Correct. But we WILL kill Sans. No matter what you say, you can't stop that!' Chara slammed a hand on the 'reset' button.

Sans stared at the kid's corpse. Shouldn't they have reset by now? All the other times he had killed them, they had reset within seconds of their soul splintering. So why were they pausing now? Maybe… Maybe since they hadn't seemed the Frisk they were before all this started, maybe Frisk had tried to stop whatever was controlling them? If that were true, then how come they hadn't tried to until now?