The House of Undertale AUs

Chapter 5: Preparing the house

Y/N's POV:

I would like to say that making the gigantic house while hosting a skeleton scientist in you was absolutely easy. I'll be lying if I said that actually.

First, we had to start on how we're going to build it. Gaster had a lot of magic but we need different magic than his.

"How are we going to have enough space for them to sleep?" Gaster asked me. I was in deep though so I didn't hear him the first time.

"I was thinking that maybe it looks small from the outside but inside they have a whole entire house in there," I muttered out loud while my Gaster brain was working hard. I was scribbling my ideas and some drawings on a piece of paper.

"Sounds nice. So, they'll all have, what, 8, 9 or 10 beds?" Gaster asked. I nodded.

"It'll have everything that their room usually has except for the kitchen. They could eat actually in the main hall so they can talk with each other. That's what I was thinking. You think that's good?" I asked Gaster.

He frowned. "How many AUs are going to be coming?"

I gulped. I've never thought about that. "I'm not sure. Is Frisk or Ink still here?" I felt Gaster shake his head. I groaned in defeat. "Maybe I could get the house to magically make a room for them."

"I've never done that before though..." Gaster mused. "How are we going to do that?"

"Don't worry," I said, not noticing that I was doing an evil smirking. "I have an idea."

~A few... no a lot of hours later~

"Done!" I announced. Core Frisk, Ink, and Error all stood next to me. It didn't look so big but once we stepped inside, there was a grand hall (see picture above) and stairs leading up. There weren't any rooms yet but the magic house will make rooms whenever an AU comes. There was also a back door that leads to where Grillby would make his shop and where all the monsters could live with the humans.

"Looks good," Frisk grinned. Ink and Error nodded.

"And about time, I think," Ink added. "If me and Error are correct, then the attack would be tonight. Will you be awake by then?"

I nodded. "I have to work on a few things, and they have to come at night anyways. The human world here is dangerous but at night is where they can come and sneak in. There's a back door at my house. Go through it, get through the mist, which only me and Gaster knows the way, and then we'll get to the house."

"Sounds like a plan then," Ink clasped his boney hands. "What time?"

"Somewhat before dinner, can you?"

Frisk's POV:

"SANS! I DON'T UNDERSTAND. WHY MUST WE LEAVE?" Papyrus rushed after the nervous Sans.

"Not now, Paps. We're all in danger," Sans waved the question aside. "Kid, you called them yet?"

I nodded. "I called Alphys. She'll get Undyne. Toriel's bring Asgore and Asriel. Is Grillby and all the other monsters that trusted us here yet?"

Chara was looking at the window. "They're all here," he confirmed.

"Chara, what did Ink mean when he said that you're supposed to be only in the Genocide timelines?" I suddenly blurted out. Sans froze, his eye turning blue.

"I don't know," Chara confessed. He looked a bit sad. "From what he showed me, I was a ghost and at first, we were friends. Then, I made you reset and I controlled your body. I made you kill everyone. I reseted a lot, doing it again and again."

I gasped. Sans' eye was glowing now. "You're not coming with us," he declared. Unfortunately, Toriel came in and heard what Sans said.

"Sans! What do you mean?" Toriel gasped.

"It's ok, mom. I understand," Chara whispered.

"No. My child will not be left here," Toriel exclaimed to Sans.

"Wait wait!" I cried before my mom and Sans could get in the fight. They both looked at me. "If Ink is right, won't Chara be good? I mean, this is a Pacifist timeline."

Sans frowned, but before he could say a word, someone knocked on the door. Asgore, who was the closest, opened the door and there stood Ink. He looked worried.

"Everyone ready?" he asked, mostly talking to Sans. Sans nodded and Ink sighed in relief. "Good, and Y/N finished as well. We'll be leaving very soon."

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Hello again! Now's the time that Undertale is gonna come over to your house. Wondering how Papyrus and Sans is going to react when they see you looking all like Gaster? Don't worry. I have an idea for that. Sorta.

Anyways, people might think I forgot about Flowey. I thought about that too. But, Asriel is Flowey (SPOILER!). I'm letting him stay like that for pretty much the whole entire story. Although, I might make him a flower again. I'm not sure.

Hey, you guys are awesome. I can't really say that but I hope you liked my story.

Peace ☮️