AN: This is a post pacifism AU, where Sans, Papyrus, and Tori have adopted Frisk, and are raising them in the human realm. This will have Undertale spoilers, so please play the game first! :) I'll be sticking to canon (or at least my own interpretation of canon) as best as possible, but infinite timelines mean infinite possibilities, so if my interpretation is different than yours, forgive me :)

My version of Frisk is gender neutral (but a "he/his" pronoun may have accidently slipped in here and there, so forgive me) and is mute (speaking in sign language). I just wanted to clear that up so I don't confuse anyone :)

I have a pretty clear idea of where this is going, and so hope to update regularly (but holidays are coming up, so forgive me if I'm a bit slow!). There's also going to be quite a bit of domestic fluff in between actual plot points because fight me.

Sorry for the long author's note, I'll try to keep them short and sweet in the future. Here's hoping my story doesn't give you a bad time ;)

Chapter One - That kid sure has a lot of nightmares -

"Beware that, when fighting monsters, you yourself do not become a monster... for when you gaze long into the abyss. The abyss gazes also into you."

-Nietzsche

Sans woke to the sound of the human shrieking unintelligibly. He bolted out of bed and ran to Frisk's room, one eye glowing brightly so he could see where he was going.

"Wake up kiddo." He whispered, nudging their shoulder. "You're having a bad dream."

Frisk whimpered and wriggled, finally opening their eyes slowly. Then they screamed again, moving away from Sans so quickly that they fell off the bed.

Pap and Tori were in the doorway by then, one of them having flicked on the light. "Sans!" Tori chastised, "What did you do to Frisk?" She ran over to Frisk, scooping them up in one arm.

"I didn't do anything." Sans defended. "I heard them screaming and I came in to check on them."

"Are you okay, Frisk?" Tori asked the hyperventilating child in her arms. Frisk responded by burying their face dearer into Tori's fluffy neck. She sighed. "You probably frightened them a little."

Papyrus walked over and sat beside Sans on Frisk's bed. "I don't understand how anyone can think Sans is scary. Look at him!"

Papyrus had no idea. And he was going to keep it that way. "Thanks, bro." He looked up at Pap, who was glowing his own eyes in response to Sans' own. That helped a little.

Frisk sniffled, looking up at them from their safe place in Tori's arms, before recoiling again at the sight of both Pap and Sans' glowing.

"Will you turn your eyes off? It's probably what's scaring them."

"Sorry, Tori." Sans said, dulling his glow until it had dissipated. Had Frisk seen Pap and his eye glow before? He had battled Papyrus – if you could call it a battle, but Sans didn't think that –

Frisk didn't have memory of the other timelines, did they? It would make sense if they did, but the kid sure didn't act like it. For as much, trouble, as they had put him through, Sans hoped that they didn't remember. He hoped that he was the only one that remembered the resets. It was easier that way.

"You okay Sans? I don't think I've ever seen you that deep in thought before." Pap asked.

Sans chuckled. "It's nothing, bro." He looked up at Tori. "Is Frisk okay?"

"I think they're asleep again." She replied, a relieved smile on her face.

"Okay, well I'm headed back to bed." He shrugged. "Come on Papyrus."

"Goodnight Tori." Papyrus said, following Sans out into the hall.

"Sans." Papyrus said, putting one hand on his shoulder before Sans could turn into his room.

"Yeah, bro?"

"Are you sure you're okay?"

"I'm alright Pap. It's just weird getting used to the human's weird habits. Some of them don't make sense."

Papyrus seemed content with that answer. "Well, try not to think about it too hard and get some sleep – not that you need it."

"Hey, some people need more beauty sleep than others. Maybe you should try it."

Pap sighed. "Goodnight Sans."

Sans did spend some time awake, thinking about the human, but he succumbed to sleep easily, despite everything on his mind. He was awoken the next morning by Frisk poking him in the forehead.

"What do you need, kid?" He asked, not wanting to open his eye-sockets.

There was a quiet pause as Sans remembered that Frisk couldn't actually speak. He opened his eyes, taking a second to adjust to the light in his room. "Okay, now tell me."

'Breakfast.' Frisk signed. 'Please.'

"Still haven't convinced Pap that spaghetti isn't a breakfast food, huh?'

Frisk shook their head.

Sans sat up. "Alright, what would you like?"

'Pancakes? And bacon.'

"You've got it kid. One Frisk special, coming up." He got out of bed and Frisk followed him into the kitchen.

"You want some pancakes, Pap?" Sans called into the living room, where Papyrus was watching cartoons. It had to be Saturday.

"Yes please! With chocolate chips!" Papyrus called back, not even turning away from the screen. For someone who didn't like to cook anything other than spaghetti, he sure liked it when Sans cooked.

"Should we asked Tori if she's hungry, or do we let her sleep?" Sans asked Frisk. She had probably stayed up half the night watching Frisk sleep, but he felt bad about not offering to make her food.

'I'll ask her.' Frisk replied.

While Frisk went to talk to Tori, Sans busied himself looking for the pancake mix. Of course it was on the top shelf. Making it blue, he pulled it down to his own level with magic.

He turned around to see Frisk pulling one of the dining room chairs into the kitchen. They really needed to get that kid a stepstool or something.

"Need some help?" He asked, and Frisk shook their head in response. They sure were determined. "Not too close to the stove now." He was starting to sound like Tori. Geez.

"Is Tori awake?"

Frisk shook their head no.

"We'll just let her sleep then." He set the bowl with the pancake mix and water in it in front of the kid. "Mix this for me while I get the bacon out of the fridge." He also handed them the bag of chocolate chips. "Add about a cup of these, too."

After a thorough examination of the fridge, Sans deduced that they were out of bacon. "Hey kid, are we accepting substitutions on the bacon?"

Frisk nodded in response.

"I'm assuming you don't want meatballs with your pancakes."

Frisk turned around and stuck out their tongue at him.

"Hot dogs?"

Frisk groaned.

"Sausage it is then. How many do you want?"

Frisk held up three fingers.

"You've got it, kid."

After breakfast, Sans and Frisk joined Papyrus in his cartoon watching, the kid curling up by Sans's side as he dozed. Whatever he had done to frighten Frisk the night before, it hadn't left a lasting impression.

Frisk tapped his shoulder. "What's up?" He replied, looking over at them.

'What makes your eyes glow?'

"Well, a lighter might do the trick, but I use magic."

'Why do you do it?'

"It's something Pap and me do to cheer each other up. It's very soothing."

"Are we talking about our glowing eyes?" Papyrus asked, looking up at them from his spot on the floor.

"We are, care to weigh in?"

"Sans taught me how when I was little and still afraid of the dark. I'm not afraid of anything now, but it made a great nightlight."

'Can you teach me?'

"Well, you'd need magic, kid."

Frisk frowned. Sans ruffled their hair. "It's more trouble than it's worth some days. Trust me."

"That's a lie Sans, magic is the-" Papyrus stopped, noticing Sans' look.

'Can humans get magic somehow?'

Papyrus looked at Sans for the answer. "Can they?"

"I'm not sure. That's something Toriel might know though."

"What might I know?" Tori called sleepily from the hallway.

"Can humans have magic?"

"No. Humans have determination." She replied in her matter of fact manner.

Frisk puffed their lip out into a pout.

"Sorry kid. You get the blood and guts, we get the glowing eye-sockets." Sans tried not to remember how aware he was of the fact that kid had a lot of blood in them for someone so small, but the memories just wouldn't leave his head. It wasn't real. Not anymore. He didn't have to remember it.

But it felt so real. Even with Frisk, the real Frisk at his side, the one that he claimed as his own, despite everything, the memories felt so real.

Sometimes, he wondered if the resets had even happened, or if he had just imagined it all. The kid didn't seem capable of doing any of the things he remembered. Or at least, not under their own power. It seemed more like a bad dream than anything now.

"Sans?" He vaguely heard Papyrus say. "SANS."

"Yeah?"

"Are you okay?"

Sans suddenly realized that he had been trying to ignore his memories of other timelines for a while. How long had he been spacing out? "I'm fine." He yawned. "Just in need of a good nap."

"I can't believe that I'm related to someone as lazy as you."

Sans yawned. Some sleep would clear his head. Hopefully. "Tough luck, bro."

He leaned into the soft back of the couch, and in moments was asleep again, barely sentient of Frisk deciding to occupy the space between his arm and chest. Humans put off a lot of heat, and it only helped to lull him to sleep. Hopefully, neither of them would be doing any dreaming.

I hope you enjoyed! Please be sure to review and tell me what you think!

-Zen and Sirius