Gaster Blaster Sans

The Door

Undyne's POV
"This better not be one of Sans's dumb pranks!" I yelled, frustrated at how long we've been following.

"It's not. He does some dumb thongs but he wouldn't go this far," Papyrus muttered, clearly worried about Sans.

"You'd better be right," I growled through clenched teeth.

Papyrus' POV
I know Sans isn't kidding. I doubt he'd go this far. We reached the end of the trail. It looks like he fainted here and people found him.
"Maybe he fainted and someone found him," I suggested.

"Well, let's continue then," she stated, dragging me along.

Sans' POV
Toriel introduced me to her child named Frisk. I offered to help clean up until the kiddo wanted to talk to me in private.
"Sans, do you remember me?" She asked, surprising me.

"Yeah, is this another genocide run?" I asked, clenching my fist.

"No, I don't want to kill anymore. Anyway, if you remember the different time lines, then you know what is happening to you has never happened before. What happened," she babbled.

"I left something Alph's, some liquid spilt on me and then... This happened," I replied, "well, we should go back to Toriel." We left the room and entered the living room. Suddenly, my bones begun hurting again. I dropped down grunting.
"Sans, are you alright?" Frisk questioned, looking down at me.

Toriel's POV
I heard knocking on the door so I went to answer it.

Time skip

Papyrus's POV
We arrived at a large door with runes on. I was hesitant to knock so Undyne banged on it. We heard footsteps approach us from the other side. A goat lady opened the door.
"Queen Toriel!" Undyne exclaimed with suprise.

"Ex-Queen. Asgore and I are no longer together," she replied.

"Anyway, we're looking for my brother. He's named Sans. He's a skeleton that wears a blue jacket with a white shirt, black shorts and white slippers," I explained, not caring about much else.

"Ah, yes. I found him unconscious in the snow. You two don't look alike though. Anyway, he's just throu-" she begun before being interupted by a scream.
"Sans!" The woman and I yelled in unison. We followed her through the hallway until we got to a living room. We saw Sans sobbing on his hands and knees next to a child. I couldn't find anything to say. Two more arms grew and his head changed into a weird shape. His clothes tore as he grew bigger.
"Sans!" I yelled, reaching to him. "He opened his eye sockets and looked at me. His eyes were glowing electric blue. He seemed to dissappear into a puff of blue smoke.
"Where is he?" The woman asked as the child ran up to her crying.

"Look, it's a human!" Undyne yelled, grinning