Frisk followed Sans through the Snowdin woods, watching as he checked every dangerous traps that happened to be there. Flowey had been strangely quiet since Sans showed up and that had been bothering them for a while. They knew that Flowey and Sans were never on good terms, but this Sans seemed different. Finally, they decided to ask.

"Remember when I said there was one who actually showed me mercy?" Flowey whispered. Frisk nodded in response. "Well, he's that one. But if Papyrus finds us, we are dead meat. Sans would never stand up to his brother."

Frisk frowned as they looked at Sans. The poor guy was walking ahead of them, but he was glancing around, as if something could jump at him any moment. They didn't doubt that one would.

Suddenly Sans stopped. Frisk looked at him, puzzled.

"i... i can't walk into snowdin with a human..." He mumbled.

"Can't you just transport us into your house?" Flowey asked.

"uh... here's the thing..." Sans rubbed the back of his head. "i can't really transport us all that far away..."

Frisk frowned, thoughts swarming in their head. There had to be a way to get to the house...

Suddenly, they had an idea. They tugged at Sans' jacket to get his attention and suggested that he pretended that he took them prisoner.

"do you really think that'll work, kid?" Sans asked, nervously staring at the seemingly deserted town of Snowdin. The young child nodded, determined.

Sans looked down to the kid and took a deep breath. "alright. i trust ya."

Frisk gave him a reassuring smile before walking, head downcast, into the town. Sans followed immediately behind, putting on a fake face of bravery. Suddenly, monsters came out, all having eyes on Sans and the human. They had mocking grins on when they saw the small skeleton, but when they noticed the human, their eyes were wide in shock. Obviously, no one liked Sans in this universe.

Sans just kept walking, though he did have a smirk on his face. Finally, they made it to the skelebrother's house, it looking plain yet frightening. Sans walked Frisk in it and slammed the door shut.

The living room, which Frisk new so well, was torn and broken. The couch was slanted, the walls were ripped, the TV had a crack in it. There were stains on the carpet, a broken table, and a rock in a cage. Frisk stared, wide-eyed, at the sight of the once, neat and orderly house. Sans just kept walking through all of it.

"This place is a mess." Flowey's face scrunched up reflexively.

"yeah, my bro and i don't really get along well. ah, the memories our fights hold here." Sans then proceeded to roll his eyes and walk upstairs. Frisk followed along. Sans lead them to his room, which wasn't as damaged but definitely dirtier.

Frisk watched Flowey's face cringe. "Do we really have to stay in here, Frisk?"

"your going to have to." Sans crossed his arms with a scowl on his face.

Frisk sat on his bed and looked at him with a questioning glance. Sans glared back. They gave him a patient smile before asking where his brother was.

"my brother?" Sans looked confused for a second. "he's probably downstairs cooking some horrid pasta or something. you're lucky he didn't hear you."

Frisk tilted their head slightly before saying that they'd like to meet him.

"no you wouldn't." Sans said simply before walking back towards the door. "now, you stay here. i'll sneak you up some food."

They nodded as Sans walked out, shutting the door. They bent down and put their ear against the ground, trying to hear anything. Flowey shuddered in disgust. "That's very unsanitary..."

They rolled their eyes and retorted by saying that he lived in dirt before getting up, picking Flowey up, and walking to the door.

"What are you doing!? Sans told us to stay here!" Flowey said frantically.

Frisk shrugged and opened the door, quietly shutting it. They then proceeded to shush Flowey and sneak downstairs. They sneaked into the kitchen and hid under the table, listening to the brother's conversation.

"You took too long!" Papyrus scolded while putting a pan into the run down oven. "What were you doing?"

"nothin', boss." Sans replied, almost nervously. There was a silence where all that was happening was Papyrus staring down a nervous Sans.

"Fine." He finally said. Sans seemed to relax a bit, but definitely not too much. Frisk frowned, not liking the relationship the brothers had. They had to do something.

Apparently, Frisk's idea of helping was getting up and tugging at Sans's jacket. Sans tensed up and Flowey went under the soil as Papyrus's gaze landed on the human.

"Sans..." Papyrus's voice lowered, almost to a growl. "Who is this?"

Sans was frozen in place, eyes flickering a bit. He told the kid to stay put in his room, and they did the opposite. Oh, how he wanted to kill them right there and then, but Classic seemed very over protective of that kid. He felt Papyrus grab his shoulder in a tight grip, almost shattering the bone. He didn't meet Papyrus's eyes that he knew were set in a glare, fearing that he would get hit in front of the kid again.

Papyrus spoke slowly and menacingly. "Did you bring this human in my house?"

"b-boss! we can't kill this human! they-" Sans's outburst was interrupted by an echoing slap to his skull.

Frisk hid behind Sans, slightly fearful. Sans was shaking, caught between his boss or his friend. Papyrus didn't give him a change to think about it as he pushed Sans out of the way, summoning a large bone. Frisk backed away, mind racing to find a way out of this. They quickly dodged the first attack, shouting that they didn't want to fight. Papyrus ignored their shouting and struck again, hitting them. Sans backed away, terrified of this situation. Frisk looked around, seeing Flowey. They quickly ran to grab him, but got hit a couple times in the process. They felt their hp lower dangerously.

"Frisk! We have to get out of here!" Flowey shouted, shaking in his pot. Frisk nodded, holding the flower close. They saw Papyrus ready to throw another bone attack and ran, but it was too late. They felt their soul break as everything went black.

_Underfell_

"Sans? What are you doing here?" Alphys yawned a bit as her skeletal friend walked through the door.

"sorry, alphys, but this is an emergency." Sans quickly accessed her computer.

"What kind of emergancy?"

"alternate Universe."

"Which one?"

"underfell."

"What happened that regards our help at this time."

"frisk is trapped there."

"Who?"

Sans paused for a second. "uh... this human that, uh, fell down here..."

"I didn't see any human..."

"well, there was one. they, uh, fell through some stray portal..."

"Oh..."

"let's just get to work on the machine."

"O-Oh, right!"

With that, Sans teleported him and the royal scientist to his secret lab and they proceeded to get to work.