A/N:

Welp, didn't realize I'd take so long with this update... school has just started back up again and my time's been sucked away. That and I've found some amazing Undertale fanfictions and am currently fighting Sans in the game. It's not the best way to fight... but oh well! Comments are always welcome!

In any case, I've decided on some AUs I will do for this series and an order!
1. UnderFell (obviously)
2. InkTale/ErrorTale
3. UnderSwap
4. MusicalTale
5. UnderLust
6. GenderSwap
7. FlowerTale
8. StoryShift
9. AfterTale

I'm thinking maybe adding in DreamTale or something, but Imma do research on everything before I do anything else. After all, I wanna figure out how everyone's gonna interact and all that shit.

In any case, enjoy!


Sans' first clue that he was no longer at home was a sudden flying red bone right past his skull. His eyes snapped up and his left eye glowed blue and yellow as he looked to the source of the attack: a skeleton who -

Sans' eyes went black in shock and fear. In front of him was... him. Albeit, this other him looked a bit different. Instead of a blue hoodie, this him wore a black coat with a fur lining. Instead of a white t-shirt, he wore a red turtleneck sweater. He still wore black basketball shorts, but he actually wore tennis shoes instead of pink slippers.

an alternate me? how's that possible? Sans thought.

"yo, who're you, asshole?" the other Sans asked, breaking Sans out of his thoughts and readying another bone attack, sharp red bones poised to strike.

"sans. sans the skeleton," Sans replied, readying a bone attack of his own, his normal white bones ready to strike at a moment's notice.

"that's impossible, since i'm sans," the other him scoffed.

"looks like an impossible day for both of us," Sans remarked, both of the skeletons' eyesockets black as they stood, ready to attack the other in a game of Chicken. Eventually, after a couple hours, they let the bones dissipate, clear to both of them that neither wanted to truly harm the other.

"so... sans, isn't it?" the other him asked, shoving his hands into his coat pockets.

"yeah. what's going on? one minute, i'm walking through snowdin forest, the next i'm fighting another me," Sans replied, shrugging and also shoving his mitten-covered hands in his pockets and looking at his doppelganger.

"welp, guess i'd better take you to my place. trust me, this place is probably a lot more dangerous than where you came from, if the way you're dressed has anything to say about it," the other him offered, turning around and ready to walk off.

Sans quickly started following the slightly larger skeleton (he hadn't noticed the height difference in the fight, but now that they were closer, he finally noticed), keeping an eyesocket out for anything that could possibly be a threat on his life. No one came out to try to kill him, but Sans kept himself ready for a potential battle, and the two Sanses soon reached Snowdin Town. Everything seemed to be mostly the same except that no one was friendly to anyone - most especially this darker version of himself. The two skeletons soon reached the other Sans' house, and they both quickly went inside before putting the door between themselves and the other monsters.

"well, at least no one tried to kill you, and my brother is out on patrol," the other Sans remarked. "just make yourself at home. there's spaghetti in the fridge if you're hungry, and my room is open to ya... not that there's much in there due to my bro being a total asshole."

"thanks," Sans replied, plopping down on the couch and sighing in slight relief. "to be honest, i thought that i'd be dusted any moment out there."

"trust me, in this world, it's KILL or BE KILLED, so i'd suggest getting some LOVE before you are killed. especially since you don't have any."

"heh, figures. i'm just gonna try to avoid anyone until i figure out how to get back home," Sans said with a shrug, "because this place is clearly not home."

Suddenly, the door slammed open, and a tall skeleton in black armor, a red scarf, the same pointed teeth as the other Sans, and resembled Papyrus barged into the house.

"SANS! WHY AREN'T YOU AT YOUR STATION?!" the skeleton yelled at the other Sans before suddenly noticing Sans on the couch. "AND WHO THE HELL DID YOU BRING INTO OUR HOUSE?!"

"sup?" Sans greeted. "i'm a different sans. don't ask me why i'm in this place instead of my own house, cause i don't know."

The other Sans groaned and facepalmed. "so much for avoiding everyone, huh?" he commented to Sans, to which Sans only gave a shrug.

"eh, i probably don't have the guts to do it anyways," Sans joked before chuckling at his own pun, which caused the other Sans to chuckle, too. Predictably, the taller skeleton groaned aloud.

"YOU'RE SANS, ALL RIGHT," the skeleton said, letting a long hand slide down his face. "I'M THE GREAT AND TERRIBLE PAPYRUS!" he introduced himself, placing a hand on his chest much like Sans' Papyrus would when talking about himself. "UGH, IT'S GOING TO BE CONFUSING TO HAVE TWO SANSES HERE."

Sans was still slightly reeling over the fact that there was a world with a different Sans and Papyrus, and missed the last comment.

"how about calling me 'red', boss?" the other Sans suggested. "he can be blue because of his hoodie."

"SO YOU DO HAVE AN INTELLIGENT BRAIN IN THAT WORTHLESS HEAD OF YOURS," Papyrus said, smiling as he noogied the other Sans - er, Red. "WELL, SINCE BLUE IS CLEARLY NEW HERE, IT WOULD BE BEST IF HE STAYS WITH US. AFTER ALL, EVERY MONSTER IN THE UNDERGROUND WILL WANT TO KILL HIM."

"wait, what? are you serious right now?" Sans asked, extremely concerned.

Papyrus sighed, facepalming again. "I THINK YOUR OTHER SELF WOULD BETTER TELL YOU THAN I. I'M GOING TO MAKE DINNER. PLEASE TRY NOT TO DESTROY THE LIVING ROOM."

Papyrus left the room, leaving the two short skeletons on their own with their much-needed-to-answer question hanging over them.