The machine in the Skeleton's basement. There's lots of speculation on what it is used for. Is it a portal to different aus? Different timelines? Is it a machine to trap the Player? Is it a machine to free Gaster? Or is it something much, much simpler? Something... forgotten? Memories of a history lost in time? Preque...
You've seen Sans past. So what is Gaster's? What about Grillby's? Welcome to the Prequel of Forgotten History!
The Barrier is broken, leaving the others to wonder if Sans old home is still there and if they can see it. Sans doesn't want to take the chance, but when he disappears, where else can they look?
Monsters are meant to have only one mate in their entire life. What would the Undertale gang do if they found out Classic had three? Thanks to PastaGod_Italy for the idea, it's not exactly a Trio, I couldn't think of one, but it works!
An accident at the C.O.R.E as a boy caused Papyrus to go blind. He never told anyone. He didn't plan on ever doing it. Until he makes it to the Surface and meets a nice girl named Nashira. Nashira seems to be able to read him like an open book and he doesn't know what to think... or what to feel. Original idea is call...
Dust HATES humans. Dust barely LIKES anyone. When the Bad Sanses are forced to guard a young goddess, Dust gets stuck alone with the child.
They think I'm like them. They think I'm rich with a happy home life. They think I'm happy.. they are wrong. Blue has been friends with Ink and Dream for years. They went to the same elementary school, the same middle school, the same high school, and now the same college. He puts on the same fake smile, pretending h...
Outcodes. They were creatures Error created as a means to keep him from being lonely in the Anti-Void. They are weak and can be killed easily since they don't have souls. To Error, they were merely pawns.. until he creates you. You are different from the others he's made and he wants to know why.
In this world, there are three kinds of people. The law, the outlaws, and the Undecided. Most monster outlaws are street racers, being adopted into a monster family you became one too. One thing everyone in the street racing business knows? Respect The Ghost. He is the father of street racing, yet nobody knows who he...
After accidently getting caught in Underfell by his counterpart, Carrot trys to reform Edge and teach him to be a better brother. Can he do it and more?
How to Love was only the beginning. it's time to expand with some Kustard, nagging Uncle Blue, and some more SpicyHoney~! Finally, Edge and Carrot are married and Edge is more than happy with what he has... what if Blue gets what he wants though and Edge ends up with more? He's never been a father before, so how will...
Red is the heir to the Fell kingdom. A kingdom known for their ruthless ways. When he is demanded to marry Raspberry of the Swapfell kingdom, well, he doesn't take it well. So the prince runs away. Deep into the wild forests of Sakonean. A place were nobody has ever returned. There he meets a guy his age, Sans. Sans k...
This takes place after Disblief Papyrus and his POV on the routes. Some truths may be told, but is there a point if everyone is just going to forget again? Story idea made for EpicDunk
Sans was driven insane because of the resets. It was bad enough when Papyrus knew the human was killing him, now his brother was too. So what happens When Papyrus snaps? Sequel made for EpicDunk
Curiosity is a dangerous thing. When Blue discovers the basement and what's down there, he can't help toying with it a little. When he wakes up afterwards, he's in the middle of a thick forest with a wolf facing him down. It is injured though, he feels pity for the deadly beast. Maybe together, the pair can survive. S...
Blue and Horror are finally safe in Underswap, but many see Horror as a threat. He's from a completely different universe that can change form and used to eat people, how could they not? Blue knows better though and he may have to choose. Horror and his daughter or his brother and friends?
Error remembers something shocking. Before he was Error, he was Geno. Even more shocking than that, before he was Geno, he was Classic. CLASSIC! The most beloved Sans in the Multiverse! So he goes to Sci for help... what he get was NOT what he expected. Thanks to MistyRose3968 for the concept idea!
Snowdin is friendly and welcoming, the people even more so. Especially the local Bar and Grill and it's owner. You are afraid to get close though. What if he's like the last guy? The character you are is a fox monster, just to let you know, because I don't know how to explain what features each reader wants, sorry.
After Blue's "kidnapping" Blue is returned with an Error doll. Everyone thinks it's creepy, but what happens if it's taken away or destroyed? Then there's a whole new problem.
Mafia: The ancient skeleton word for family. That's what Sans was taught as a boy, there is nothing more important than one's family. But the person who taught him that was killed by his own son. Sans and Papyrus became trapped in an endless loop of death, money, and power. Then you come along. He knows things have to...
So I have an idea. A crazy idea. Here me out. Ink and Error are brothers. I know, insane, right? So what caused them to end up as the Creator and the Destroyer? Well part of it was due to their parent. Another part of it was a rift between the pair. How do the others find out? Well, their may be a rift them, but t...
Y/N, meets a new coworker that changes her life forever. A monster, doing his best to make a living after moving out of the underground. Sans is this ecstatic, cheerful, absolutely innocent skeleton, smiling despite any given situation. However, Y/N finds out that Blue's wearing a different attitude outside of work. H...
Y/N's been traded and sold her entire life. She's learned firsthand that if you don't obey your master, you get hurt. If you force yourself to listen, you live another day. Monster trafficking is a popular thing down in this chaotic place. That's all she's ever known. Obey. Get a new master. Repeat. ... So why are th...
(now on the surface) Your whole life was a mess until one sudden day when you meet some skeletons that change your life. You start to have feelings for a skeleton who lights up your life.
Well... Obviously this is a Papyrus X reader.... So yeah. Interesting stuff might happen. Your human... And I may update frequently, but then at times I wont... So yeah...
(Y\N) is a young female spy and soldier fighting in the War of Humans and Monsters. She is fighting on the humans' side of the war until a turn of events when she becomes apprehended by the enemy. What will happen when a young monster scientist tries to change her views? Thanks to Itachei on Deviantart for letting me...
Error and Ink were once, 'Somebody's', they talked, they laughed together, they played together, and they sometimes got into 'Some' weird situations, but, this time feels different for the both of them. Something just doesn't feel right - or something feels off. Meaning instead of Talking, they Argue, instead of Laug...
Everyone craves the light. It's what keeps them going. people will do anything they can to keep their light shining, but what will they do if the light extinguish and what must be done for it to shine again
(This story contains 18+ subjects from the start. Please read the tags.) Forever is a long time. And being immortal, you sadly know that better than anyone. Now living in a world gone mad with hunger and death, there's only one thing that's important to you - the health and happiness of your sister. Yes, that's all...
