Not a Sansational Journey (Underlust Fem Reader)

¿GÃŚTĘR¿

"Hi Napstablook!" The little ghost smiled back blushing I light grey. Mettaton  opened the door to his little house. As the three of you went inside you looked around Mettaton's house journals and pictures everywhere. You and Mettaton sat down as Napstablook hovered in front of the table. "Okay I think I know a way to get you home.. There is a rumor going around that the first royal scientist was murdered by the king because he had found other undergrounds like this one but different.. I don't know exactly what that means but that's what I've heard.. And maybe just maybe if you can find him he can take you to a different underground that's safer so you could go home!" You nodded then frowned "but.. Where did he die?" Mettaton looked at Napstablook and said "wasn't it the core but wait isn't there another rumor that there is a secret door in waterfall that shows up and he's suppose to be in there but no one has ever gotten the guts to go see if it's true?" The tiny ghost nodded.Mettaton nodded stood up and walked up to the door you followed behind him confused. The two of you walked together in silence for a while running into monsters here and there Mettaton protecting you every step of the way. Until you reached waterfall again but this part of waterfall looked different then the one Papyrus brought you to before. The two of you looked around no one was there the only thing that was there was a check in station. You shuddered not wanting to think about Sans right now. The two of you walked a little further and saw what looked like a white door on the side of the wall. "So the rumors were true.." Mettaton looked shocked but then was replaced with a look of fear "y/n I don't think I can go with you.. I'll wait out here though.." Now it was your turn to look shocked "BUT Mettaton I need you I know nothing about this.." He looked away from you to ashamed to make eye contact "fine I'll go alone!" You opened to door slowly and walked in. Then it slammed shut behind you with a loud BANG! You called out to Mettaton who tried to open the door without success then all of a sudden Mettaton screamed long and hard once then was silent. You started to panic "Mettaton? METTATON!" No answer then you heard another voice that you knew all to well. "Hey beautiful~" you started running further and further into the dark room you ran as fast as you could and hit a wall it was the end of the room "a dead end..." You started to panic even more then before desperately trying to find a button a switch something. You heard low chuckling behind you. You turned around you didn't see him but you saw his aura dark purple and it was getting closer. You closed your eyes not wanting to see what happens next  then all of a sudden arms grabbed you from behind and pulled you through the wall you hit the floor with a thud you heard sans yelling and cursing but it was no good he couldn't get to you. A figure turned you around and stood you up and checked up and down to make sure you were okay.The figure was in a black robe well more like black goo it's hands had one big hole in the center of each of them his face was warped his eyes two shifty white orbs. You gawked at the figure unable to say a word. It smiled at you and started to speak but you couldn't understand it. You shrugged your shoulders at him saying "I can't understand you" he nodded and lifted his hands and wrote 'My name is Gaster'  on the wall it first appeared as wingdings then changed to proper English. You smiled and wrote with your finger on the wall 'my name is y/n' it turned into wingdings as soon as you wrote it down. You giggled at how your name looked in the weird little fount. The two of you had a conversation by writing on the wall. You asked about the rumor about the different undergrounds and he said they were true. 'Is there a way I could get home then?'  He frowned and wrote 'yes and no' you looked confused and he explained that it's kind of like you have to go through the motions like a program and that you were the only one that's not done what the programming assigned. 'To get to the end you have to do what the program intended' you looked confused 'what's the point of there being other undergrounds if you can't use them?' He frowned again and wrote 'it would mess up the balance of our world and theres as well.' You looked desperate as you wrote 'please you'll never know what happens if you never try!' Gaster shook his head and drew a square with his finger and a screen type thing appeared it showed a dead Mettaton. You gasped and ran over to the screen staring in horror at your dead friend you started to tear up and wrote. 'Why did he die?' Gaster looked upset as he wrote 'Sans killed him because he only wants you y/n.. You're defying the program which means everyone is trying to stop you..' Then he drew about six circles and images that looked like the underground appeared on the screens. You walked up to the circles and looked through them and wrote 'are these the different undergrounds?' Gaster nodded and you saw one that looked like underlust as Mettaton called it and wrote 'including this one?' Gaster nodded again. Then all of a sudden there was a blast as the wall crashes to the ground and Sans steps through the rubble you panic as you see his crazy expression you turn to Gaster who has the same expression you back up against the wall with the circles Gaster shakes his head his eyes frantic now and writes 'Sans and I are one in the same you're in danger now I don't know how much longer I will be normal with him in my presence the underlust underground is like a reset go through that one hurry!' Gaster grabs his head and pain. You don't know if you should because that means that you will have to start all over gain but you don't know what else to do then you see it. An underground that looks normal you see Mettaton and Papyrus dancing on a stage Sans sleeping at a bar Toriel making  pie you don't think twice you up through that circle as Sans tries to grab you he scratched your arm it bled as you scream and fall. you hit the ground and get the wind knocked out of you. "I made it.." You whisper as everything  goes black.