Neither Undyne or Papyrus could sleep that night. Which is probably why when Undyne went down to look at the machine, Papyrus was staring at it already.
"You doin' okay bud?" Undyne said, yawning as she trotted up to stand beside the skeleton. Papyrus looked at the other with a unreadable expression. "I just can't wait to go see him! I can't believe Alphys had told us to wait for tomorrow." The scientist had explained it would be better to look for him during the daytime, and when Papyrus wasn't flipping his lid too much. So after she had finished the machine she had made the others go to bed - Undyne had to literally pull Pap away - so that they could get rest and all that. But it looked like Papyrus was too excited to see his brother. "Yeah, me too! But we gotta wait. That's what Alphys ordered." She patted Papyrus on his shoulder a few times. Then they sat in silence; Pap most likely thinking about the machine and Undyne thinking about Pap.
"Hm. Papyrus?" Undyne asked, turning to Papyrus with a curious expression. The skeleton returned the same look. "Yes?" The female looked at the ground for a moment, her hands in her pants pockets. "You really do care about you're brother, don't you?" The other seemed stunned, and he blinked his eyes a few times. Undyne lifted up her head, a small smile on her lips. "Heh! I've never seen you so anxious to see someone before. Even Mettaton! You'd go to the ends of the earth to get him back, wont you?" Papyrus nodded, listening intently. "You know that I'm the better fighter here - everyone can agree with that - but one thing's for certain is that you care about people more than anyone I know. To be fair, I've never been more impressed. If there was some sort of royal therapist rank, you'd be way up there at the top." She exaggerated what she said by raising her thumb up above her head. She saw Papyrus blush a bright orange, and the male sputtered "Th-Thanks, Undyne! You are a very great friend!" The female returned the compliment with a wink and a shark-tooth filled grin, and she said "But I'm still the best fighter!" And with that, Undyne playfully caught Papyrus with her arm and the two fell over wrestling on the floor, laughing and squealing.
But on the way down, Undyne's arm was caught with a switch on the machine, and it began to slowly and lowly rumble. Long story short, they had accidentally turned the thing to life.
They had stopped they're playfight with Papyrus pinning Undyne to the ground, and the skeleton was about to say something in triumph when they were both interrupted by the machine. Undyne said "It turned on? When?" Papyrus stared at the machine with a alarmed look, before he helped Undyne up. "I... I don't know how to turn it off!" Papyrus said, eyes growing wide. "What do we do?" Undyne stared at the machine, eyes just as wide before she slowly narrowed her eyebrows. "If we let it go, it'll not be able to come back." She muttered mostly to herself. Papyrus gave her a puzzled look. "What does that mean?"
"We go now!" Undyne grabbed Pap's arm, yanked the door to the machine open and clambered in, pulling Papyrus in a tight embrace as she expected the worst to happen.
But, they were fine.
The two were still in the machine, hugging each other tightly. The only difference was that it was extremely hot. "Are we dead?" Papyrus whined, his face buried in Undyne's neck from fear. "Are we gone?" The fish blinked her eyes before she pushed Papyrus away. "I don't think so." The skeleton gave her a odd look, before he stretched out his arm and slowly opened the door to the machine. Undyne could obviously tell that it was Hotland. "This is strange..." The female muttered darkly, pulling herself out of the object and helping Papyrus out as well. She heard Pap say "We must of jumped timelines!" Undyne was about to respond with 'I hope so' when they heard a familiar voice.
"A-A-Are we there yet?"
"That's Sans!" Papyrus shrieked, and it took all of Undyne's strength to restrain him. "Not yet! Not yet." The other calmed up against her. "Let's hide. It sounds like Sans is coming close." The two hid behind a particularly large rock, and they poked their heads from the side of the rock and listened intently.
They saw three figures; a human with a green and yellow sweater on, a flower, and Sans - "There he is!" "Shut up, Papyrus!" - Sans was being pulled by some sort of rope like figure, and he walked slowly. But even though he walked in a slow pace he seemed exhausted. A feverish glow was around his cheeks, and there were dents and cracks in his head. There even seemed to be wounds in his eyesockets, probably rendering him blind. To be frank, he didn't look alright at all. "Holy fuck..." Undyne murmured, eyes narrowing. "Would you look at that, Pap!" She looked up. She had never seen the skeleton look more furious in her entire life. Oh no. "...Hey, Pap? Calm down."
"Look what they did, Undyne." His voice was dangerously quiet. "Look what they fucking did to my brother." She had never heard him swear ever. The skeleton was emerging from the rock, conjuring up bones that floated with orange magic. He was walking towards the two. "Papyrus! Stop!" But Pap didn't seem to hear her. He was stomping over in a angry mood.
"Did he deserve to be treated like this? No. Did he deserve to live with you two? No! And what does he get for just trying to.. Be himself?" His body was shaking as he conjured up gaster blasters behind him. The flower had pushed Sans behind a bush and they were looking at Papyrus with a hateful but worried look. "He gets to be treated like shit by you two pieces of rotting scum!" Bones, in quick succession, flew at the two and gaster blasters fired orange rays. There was no chance they could have survived. They - even the human - were merely ashes. "You fucking... You fucking deserve whatever gate of Hell you go into. I hope you suffer what he went through for as long as time lasts." The skeleton spat the corpses. Undyne slowly emerged from the rock, and when she walked over to Papyrus she saw that he was crying. "Holy shit... Papyrus, come on."
She slowly led him to Sans. The smaller skeleton was crying too, trying to hide himself behind a large jacket. Undune had offered to go get medicine, as she saw that the two obviously needed alone time, and left the scene. Still thinking about Papyrus' tiny speech.
It was so quite and lonely in this timeline that Undyne was happy that she was on her way back to the brothers, but once she arrived she almost wanted to go back to the abandoned places of Waterfall and Snowdin. Instead of finding the two hugging and laugh-crying like she had hoped, she saw Papyrus crying over a pile of dust. He was hunched over. The fish instantly dropped what she was carrying and sprinted over, hugging the skeleton from behind. She didn't need to ask, she already knew. She also knew that no words of comfort would help, so she just helped by hugging him and letting him sob into her shoulder.
She didn't want to go back and tell the others of what happened.
/this isnt the end! there is still pacifist and genocide endings! ;0/