Possession (Gaster x Sans Fanfic)

Please don't take my Starlight away

A/N: Been abroad for two weeks otherwise this chapter would've been up sooner. Sorry. Anyways, my birthday was the 22nd so I have been celebrating as well and thought I already have wrote the chapter so I might as well update. Dunno when the next one is but hopefully in in a week or two. Enjoy.

"why are you still up, kid?"

Couldn't sleep. What about him?

"you know why i nap so much."

Yeah. Sorry.

"you said it wasn't your fault. i trust you."

He shouldn't. He really shouldn't. But it makes you feel better. You ask why he's here.

"nightmares were bad. came to check on everyone to prove things are still moving forward, ya know."

You understand. You've done that multiple times. And looked in the mirror to 'check' you are still you.

Does he want to join you? You both need the rest. Sans agrees and you both lie down together in your bed under your covers. You feel Sans relax and his breathing even out as he falls into a deep sleep. You smile and turn round to face Sans, who is facing away from you. You wrap your arms around him and get closer, your head on his shoulder. You relax completely and close your eyes, falling asleep, finally, fully content in this moment.

You wish his could last forever but it's life and without the downs, you wouldn't appreciate the ups.

Your dreams are filled with darkness that is blacker than black. There is nothing. You don't like nothingness. It reminds you of when you got to the End.

You got lucky back then.

You'll never admit it, but your biggest fear is being alone. You hate it. Before you at least had Chara always, now you had no one. They may be a bit deranged but at least they were always there.

You miss them.

Aww, really? That's so sweet.

You hate it.

Why?

You hate them. You can't enjoy anything with them and their threat of the End looming over your shoulder.

Now, now. Don't be like that partner. You could just give up. Admit the truth. We're the SAME!

No, you're not like them.

Of course not in this timeline. You're the perfect pacifist who freed all monsterkind. But you really aren't, are you? I know what you really are. Why don't you admit it?

It's not true.

It is and you know it.

It's not!

You don't admit it because of him.

IT'S NOT!

You're a liar because you don't want him to hate you. How can something so disgusting make you happy?

You don't answer.

No answer? No matter. Nothing you do matters in the End. You know I'm DETERMINED and stronger than you. I will get my way. The End is near.

You don't answer. Chara's right. They are stronger and won't give up until they get their way. You know you can't win. But you're DETERMINED to make the most of the time you have left.

I see you still refuse to give up. Do not worry partner, the End won't let anyone suffer, even your dear comedian.

You won't listen.

Fine. I've got time and another idea to make. You. Crack.

You shiver at that. What are they gonna do?

No answer. You're all alone again.

Chara?

Nothing.

...

What was that? You swear you saw something white. Maybe the darkness is finally getting to you. You must be hallucinating.

No. You're not. You saw it again.

And again.

And again.

Until...

"kid?"

Sans? Oh no! It's him. What's he doing here?

"kid, what's going on?"

You don't know but it's not safe. He needs to go.

"go where? there's no where to go."

He's right.

"stay there kid. i'm coming to you."

Alright.

You see a flash of red. NO, SANS! LOOK OUT!

"wha-"

He falls forward into your arms as a knife strikes his back on the same way 'you' did in those timelines. The red eyes that had appeared behind him are gone but you feel them watching you as you cradle Sans's skull as he turns to dust slowly.

"it's okay kid. don't cry," Sans reaches up weakly and wipes your tears away - you were crying?

You hear a strangled cry and it takes you a while to realise it's coming from you. It doesn't echo but disperses, like it doesn't exist. You hold him close.

This is only a dream.

...

And you're never waking up.

It happens over.

And over.

And over again.

Eventually, they get bored of just killing him in front of you and make him suffer first. Sometimes he is forced to watch you kill his loved ones. Sometimes you are forced to tell him that you started the killing. It's awful and lasts forever. No matter how many times you watch him get hurt, it hurts like you never saw him get hurt before. You're not used to it and never will be. You just want it to stop.

Really?

Yes.

Will you give up? Let me win.

Yes. Just make it stop.

Of course partner. We'll be in contact. I'll let you live happily for a bit, then we can bring about the End.

...

You wake up with a start, sitting up quickly. Sans is startled awake and starts trying to calm you down. You latch onto him like a lifeline and just sob into his shirt, your death grip never easing up. He just whispers comforts and holds you. Eventually you calm down enough to allow your sins to die down into slight whimpers.

"wanna talk about it?"

No. Definitely no. You just cuddle into Sans and the two of you lie into bed. Your clock reads 3:54am. You just lie there until the sounds of movement can be heard and light leaks into your room, indicating that the rest of the house is waking up. You look at Sans. He is finally getting some sleep. He needs it with his 'condition'.

You realise just how much you need him. You can't lose him. Please don't take him away.

Finally, real progress. The child has finally cracked. Things are getting better. Soon you will have what is yours.

Keep your part of the bargain and I will keep mine.

Always. As long as you get what you are owed, you will allow them access to your magic.

Never turn on me or I will make you and those you love suffer. Understood?

You understand. There was no need for the threat - you wouldn't turn on them. You need them as much as they need you.

...

Just please don't take my Starlight away.