Author's note
I skipped some parts of the story to here, because I just wanted to add it in this part. Don't worry, I'll still add most of the underswap characters in some of the next chapters, so enjoy the story!Long chapter up ahead! Some ideas don't belong to me. Also, sorry for the late uploads 😅
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I walked down a huge hall. Light from the window cast shadows from the pillars. At the end of it, should lead me to their leader. As I stroll down the hall, I see a tall figure leaning against a pillar.

I get closer to it, and it reveals a skeleton wearing a red hoodie. He was smoking a cigarette.

"Oh, you came." The skeleton said. He looked in my direction.

"Of course I came.", I said."How is it like sans a brother?"I smirked.

He grimaced. He replied, " It's horrible." He stood up straight and walked into the middle of the room.
"Hey, do you remember when I said I believed in you? Well, screw that!"

He held out his hand, and a long bone appeared. He grabbed it and his right eye started to have an orange glow.

"Well, do you want to start?" I asked.

He angrily looked at me and said,
"Yeah, lets go, you dirty brother killer."

We were engaged in battle. Various screens appeared around me. I grabbed my trusty knife and I was about to attack, until something in me stop myself. I started to feel dizzy, and I lost control over myself.
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I woke up in a large hall. I don't what happened and how I got here. I looked around and I saw that I was in the Hall of Judgment and I was I was in a battle. Why am I here?

I noticed a figure standing in the middle of the hallway. The figure was a tall and skinny skeleton. He wore a cherry red hoodie and he was smoking a cigarette. He held a long bone and his right eye was glowing orange. He wore a torn blue scarf around his neck. He looked angry about something...

He looked like Papyrus, but he would never wear that. But then again, this is a swapped around world...

" Papyrus..?" I asked.

He glared at me and said, " Yeah, that's me."

Suddenly, I felt my heart being thrown against the wall, like gravity changed the way I went. I slammed into the wall of the hall. I expected to be choking some blood, but I didn't.

I looked at him with a scared expression. " Papyrus, what are you doing?!" I screamed.

He avoided eye contact with me and started to slam me and my heart into the wall again.

I fall down to the ground. I worriedly yelled, " What happened? Tell me!"

He silently stared at me for a while, then he replied, " Why are you acting like you never did anything!?" He brought out huge gasterblasters and he shot them at me. I tried to dodge it, but it got me around my waist. He brought out bones and my heart was taking a lot of damage. I was cut and bruised everywhere, and my sweater started to get rips in them.

After a few attacks, Papyrus stopped. He glared at me and said, " Why are you acting so innocent when you're the reason everybody is gone?!"

I frozed. What is he saying?

He stared at me intensely and said, "You've killed everyone."

I stopped. I killed... Everyone? As I had this thought, I realized that I was holding something in my hand. I don't know how I just noticed that, but I guess I got used to holding the item. I looked down, and I saw that I was holding a knife. My hands was covered in white powder. My eyes widened.

I shot my head towards the options. I looked down to the screen, LOVE. My LOVE was at 19. Everything makes sense now. Why I barely felt anything while being smashed into that walls. Everything Papyrus was saying. I killed everyone.

Small tears started to trickle down my cheeks. Why is this happening again?! I reseted so everything could go back to normal, but why is it not changing?! Papyrus kept glaring at me. There was a silence between us two. All I could hear was my sobbing.

Finally, Papyrus was the first one to make a move. He summoned gasterblasters and fired them at me. I didn't want to move, but I dodged anyways. Sure, I felt really bad, but I didn't want to die yet.

Suddenly, a part of me decided to slash my knife at him. He dodged it, which I was glad. I didn't want to hurt anybody, but another part of me did, which I couldn't control it. So I dodged Papyrus             
while the other side of me attacked.

Papyrus threw bones at me, and slammed me wall to wall. He would try to hit me with his gasterblasters and the bone he was holding in his hand. I tried my best to dodged them, but I would still get hit. Finally, by the time Papyrus said something, the ground and ceilings were crawling with bones, and the walls were damaged. "Hey, " he said,"if you make it past through this I will be forced to use my special attack."

His special attack? I wonder what it is. Suddenly, he unleashed a series of attacks, one after another. I jumped left and right, trying to dodged all of them, but I couldn't. After that frenzy, he sent me and my heart flying down the hall, and I had dodged all of the bones. I missed some of them, but not all of them.

Finally I reached the end of the hall, with one health left. I pant and gasped, and I saw Papyrus approaching me. He tried to stab me with his bone, but I made a last effort to tumble to the side, so it missed me.

I looked in my inventory for food, but there was none in there. I mean, come on?! Who would travel without food?!

Papyrus grabbed his bone and backed up. He glared at me and said " Well, I guess I'm forced to use my attack."

He brought his arm up and summoned bones. They  were tall, and I tried to jump over them. I barely made it over one, and I kept going. I moved to the right a little and I noticed that the bones were spelling something. I turned my head while jumping to read what it was saying.

I read ' Papyrus and Sans, best bros forever and ever and eve...' The bones started to collapse during the end of the sentence. Suddenly, the bones were gone.

I turned my head towards Papyrus, who was trembling. His eyes started to water. He started to burst in tears. He fell to his knees and started sobbing. He covered his face and cried. He cries and cried. He seemed to forgot that I was here. Suddenly, two options appeared in front on me.

Spare or Fight.