Possession (Gaster x Sans Fanfic)

My only starlight

Greetings Gasty. Miss me?

Yeah. Where have you been? Can we go?

Haha. Excited are we? Sure but I need your help or I would've already gone.

Understandable. You hold your hand out for Chara to take. Their demonic smile would send shivers down your spine but the Void has caused a blockage in all of your emotions except your desire to return to and have him. Chara places your hand against something that feels solid. You haven't felt anything for a long time. Your and Chara's hands glow and the Void seems to act like a curtain that is drawn, revealing a white room. The brightness is blinding. At the place where your hand is, is a grey door. Chara opens it and you see that you are in Waterfall in a hallway that shouldn't exist. You both exit. You're real... YOU'RE REAL!

Yeah, feels great doesn't it. We are kinda like ghosts though. Only those closest to us can see us and of course we can see each other.

What now?

Do whatever. You wanted to see your starlight right? Lovebird. Ha. I'm off to terrorise Flowey. See ya.

Um, bye? You aren't fully existing it seems. You are no more than sludge with a skull. You wander throughout Waterfall, finding pleasure in everything until your SOUL stops as you turn a corner. You see him there. He is by that bench with the abandoned quiche talking with that ragtag group of friends. They are having a lunch break it seems he interrupted. He is making the same announcement he does every RESET. He does it in different places and circumstances so he doesn't go insane every RESET. But it is always the same thing with the same people. He had just finished the announcement when you arrived and everyone is congratulating him.

You look at that child sat next to him. Their red SOUL would give you the power needed to escape the Void permanently. You stare hungrily at it, possibly in some vain hope that it will leave its owner and come to you The child stands up and tugs on his sleeve, urging him to follow. He does so without argument and a fond smile that causes you to feel a large surge of jealousy and possessiveness. You follow the pair, keeping your distance in case he can see you. They stop by the telescope near your room and the child gives him something. A heart shaped locket. They say it shows they are best friends and is a tradition they want to start since the Dreemurr children did this. Will he start the tradition with them? He smiles and nod, leaving you in an angered and jealous state. That child will suffer! No one takes what is yours!

The child turns to you and you freeze a moment too long before disappearing behind the wall you're next to. They could've seen you. The child heads towards you. They saw you? You could use this. The child is curious and follows the shadow they saw move. Echo flowers are filled with static. The child follows them to Sans's telescope and into a hallway that shouldn't exist. It hasn't been there before. A grey door is in that hallway. The child's curiosity at something new has them open it and walk into the white room. The door fades and the child observed the melting black figure with a melted white face -face or skull, neither anymore- and white hands with holes that make his bottom half look like an upside down face. They approach and ask the figure who is he and many other questions. All you need to do to beckon the child towards you is give them a lack of response to engage their overwhelming curiosity. They wouldn't understand you if you spoke anyways. Wingdings is something even skeletons struggle to understand and is practically impossible to understand when spoke -he learnt to sign for a reason.

The child is right in front of you. You tell the child thank you for their SOUL and your freedom. You start to expand with the desire to engulf the child and the SOUL (the VOID can digest a human child, even this determined), when you feel pure pain in your back and are dragged out of view and into non-existence where you are just an onlooker. Looking behind yourself, you see them.

Greetings Gaster.

No Gasty, Chara?

You know the rules. We don't touch each other's things. I don't touch your starlight and you don't touch my determination.

You guess you got a little greedy.

Alright. That was a warning. Next time we can go, don't touch Frisk. Frisk is mine. Understood?

Of course. Next time, you will do what you really wanted.

*Meanwhile*

"kid? where did you go?"

You tell Sans you're over here.

"thank dog. tori woulda killed me if i lost ya kiddo. where'd you go?"

You tell Sans you can't remember but you remember FUN 66 for some reason. Strange, right?

"heh yeah. add another 6 and we got that demon number you humans are so fond of. better get back though before fishface comes after us and burns down the whole of waterfall."

How? It's filled with water.

"kid, it's undyne. that lady can burn down anything easily, way too easily."

You have to agree with that one. You head back to the picnic. Sans, you coming?

"yeah, one sec kiddo. i'll catch up."

Okay.

Sans walks up to the nearest echo flower.

It's just funny. That's my— S4rL1Gh7.

The echo flower seems to have been overwritten by a glitch in the code.

"starlight? why does that sound so familiar?" Sans asks himself before shrugging and heading towards the picnic to catch up with Frisk just like he promised. He misses the echo flower's message glitch again.

That's my — S4rL1Gh7.

That's my — D373rM1n4710N