Error talking

Nightmare talking

Thinking/Ghosts talking

It all started when Horror went for a walk in a Surface AU... and came back with a dog. It was small, fluffy, and just generally adorable. And Horror was in love with it. The other Bad Sans waited for Nightmare to tell him to get rid of the animal... but that never happened. After a month, little Cotton was just another part of the household, and generally ignored. It wasn't uncommon to see Horror playing with the fluffball, or just cuddling with her. It was cute... and made the others wonder if they could have pets as well.

Cross was the next one to bring home an animal, a small black bunny with white socks. It was rather unimaginatively named Socks, and was also ignored by Nightmare. Surprisingly, Cotton and Socks got along very well. Then Dust left for a few days... and came back with a friggin goat. Granted, it was a dwarf breed and a runt, but still. He brought home a goat. Maggie lived in the backyard, and was actually quite playful, her and Dust having little play fights all the time.

Killer was the next one that brought home a pet. It was small, black, and had six tails. Oh, and it was capable of breathing fire. He named it Kit. Whenever he wasn't going on EXP runs, he was with Kit, either grooming her, playing with her, or just reading with her curled up in his lap. She didn't mind the other pets in the house, but preferred to be on her own, or with Killer. And Killer never told the others where he found Kit, no matter how much they asked.

Error honestly didn't mean to adopt his cats, but he had found the abandoned litter of kittens in the Classic Undertale AU, and well... He just couldn't leave them! So the litter of five barely week old kittens found their way home. After a week, their eyes were open and the little guys were stumbling around. It was actually quite amusing, as Cotton had seemingly adopted the little kittens as her own, even though they were not the same species. Error took very good care of them, going so far as disguising himself and taking them to a vet so he could learn how to take care of the abandoned kittens, since they were too young for solid food. He named the two girls Void and Glitch, and the three boys Null, Fallacy and Cypher.

A few months after that, Nightmare cracked. He went to another AU for a few days, and returned with a pet of his own. Well... if it could be called a pet. He brought back a black and white tiger cub. He ignored the dropped jaws of his men as he took the little cub to his office. Zane was surprisingly docile, but this could be attributed to the fact that Nightmare had admitted to stealing him from a big cat house, where humans interacted with the cats on a daily basis. Combine that with Nightmare's natural abilities... well, the tiger wasn't attacking any of them any time soon.

A few years later...

"We've got you surround... wait, what?!" Ink said, rubbing his skull in confusion. All the Bad Sans instantly turned to look at the Star Sans from their spots in the grass, where they had been watching their respective pets play. "Uuummm..." Dream said, looking over at his brother, who was stroking a huge black and white tiger calmly. Blue had instantly gone over to play with the dog, cats and rabbit, leaving Dream and Ink alone. "Well... this is awkward." Ink said, breaking the silence. Killer snorted, brushing an odd black fox creature. "Ya think?" Dream looked away again, watching as a couple of the cats broke away from the group with Blue and headed over to Error, purring loudly. The Destroyer happily patted his lap, letting them curl up and sleep there as he knitted... wait, Error could knit?

"Look, will you morons just go? We aren't doing anything as you can tell. So let us enjoy our day off." Nightmare said snappishly, Zane growling in response to his rising irritation. Ink opened his mouth, but before he could say anything, Dream clapped his hand over Ink's mouth and started dragging him away. "Sorry, brother!" he called cheerfully, ignoring Nightmare's growl at Dream calling him brother. On their way to the spot they portaled in at, a small, golden brown goat with white spots and small horns suddenly snatched Ink's scarf, causing him to scream in dismay. "MY SCARF!!!" The little goat ran up to a laughing Dust with the scarf, which only made him laugh harder. Before Ink could try and demand the scarf back, Dream used his magic to bring the scarf back and just opened a portal right there, shoving Ink through before he could do anything stupid. Error looked over at Nightmare as the portal closed. "We're going to need to find a new spot to take the animals, aren't we?" Nightmare just groaned and nodded yes. It had taken them 3 months to find this place...