When Nightmare said he wanted a group of monsters that would be loyal to only him and cause mayhem, he didn't mean four babybone brats. Now he has to take care of them while also trying to train them to become the perfect group of monsters that he wanted when they grow up.

Want to talk about falling into the wrong place at the wrong time? Y/N definitely scored big time on that one. One moment she's falling, the next she finds herself trapped underground with a monster that wiped out his own kind. He's a cold-blooded killer that never shows any emotion. Though, as time passes, she finds out that Sans isn't as heartless as he plays himself to be. Hello! Writer~San here! Cover art and Undertale AU/Characters aren't mine, but the story definitely is. I hope you enjoy it!!!!

Note to self: Never make jokes about getting reincarnated into a video game character because it'll actually happen. Welp too late to go back now, considering I'm already dead. Aka: Character gets reborn as Swap!Sans

|𝐀 drop of life, 𝐀 hint of color, 𝐀 touch of chaos| 𝐀ll things necessary for 𝑨 𝑪𝑹𝑬𝑨𝑻𝑶𝑹. . It is what makes someone unique, beautiful, and amazing. That is what the unfortunate soul has to endure for the sake of an entity vastly greater in her ego than her integrity. She sweetly entices someone into her game while many others are already playing . That is what you are to 𝘏𝘦𝘳. Of course, 𝘠𝘰𝘶 don't know that, yet. Because you're still young, bold, and learning. You, so far, are the epitome of "ignorance is bliss, but straying is a fools worth." While you wish to stay the same, not many can accomplish that. So, why would the laws bend for you? _______________________________________________ 𝗬𝗲𝘀, 𝗵𝗲𝗹𝗹𝗼, 𝗶𝘁 𝗶𝘀 𝗠𝗘! 𝗠𝗮𝗿𝘀, 𝘁𝗵𝗲 𝗮𝗺𝗮𝘇𝗶𝗻𝗴 𝗯𝘂𝘁 𝘂𝗻𝗹𝗼𝘆𝗮𝗹 𝗮𝘂𝘁𝗵𝗼𝗿. 𝗕𝗲𝗳𝗼𝗿𝗲 𝘆𝗼𝘂 𝗮𝘀𝗸, 𝘆𝗲𝘀 𝘁𝗵𝗶𝘀 𝗶𝘀 𝗮 𝗿𝗲𝗺𝗮𝗸𝗲/𝗿𝗲𝘄𝗿𝗶𝘁𝗲 𝗼𝗳 𝗺𝘆 𝗹𝗶𝗳𝗲'𝘀 𝗚𝗥𝗘𝗔𝗧𝗘𝗦𝗧 𝗪𝗢𝗥𝗞, 𝗻𝗼𝘁𝗲 𝘁𝗵𝗲 𝘀𝗮𝗿𝗰𝗮𝘀𝗺... '𝗜𝗻𝗸𝘆 𝗠𝗶𝘀𝘁𝗮𝗸𝗲𝘀.' 𝗟𝗲𝘁'𝘀 𝗴𝗼 𝘁𝗵𝗿𝗼𝘂𝗴𝗵 𝘁𝗵𝗶𝘀 𝗼𝗻𝗲 𝗺𝗼𝗿𝗲 𝘁𝗶𝗺𝗲: 𝗡𝗼, 𝗜 𝗱𝗼𝗻𝘁 𝗼𝘄𝗻 𝗮𝗻𝘆 𝗦𝗮𝗻𝘀 𝗔𝘂𝘀, 𝗯𝗲𝘀𝗶𝗱𝗲𝘀 𝘀𝗼𝗺𝗲 𝗢𝗰'𝘀 𝗶𝗳 𝘁𝗵𝗲𝘆 𝗮𝗿𝗲 𝗯𝗿𝗼𝘂𝗴𝗵𝘁 𝗶𝗻, 𝗜 𝘄𝗼𝘂𝗹𝗱 𝗯𝗲 𝗳𝗮𝗺𝗼𝘂𝘀 𝗯𝘆 𝗻𝗼𝘄 𝗶𝗳 𝗜 𝗱𝗶𝗱. 𝗜 𝘄𝗿𝗶𝘁𝗲 𝗳𝗼𝗿 𝗳𝘂𝗻 𝘀𝗼 𝗽𝗹𝗲𝗮𝘀𝗲 𝗱𝗼𝗻'𝘁 𝗱𝗲𝗺𝗮𝗻𝗱 𝗺𝗲 𝗶𝗳 𝗰𝗵𝗮𝗽𝘁𝗲𝗿𝘀 𝗯𝘂𝘁 𝗮 𝗳𝗲𝘄 𝗿𝗲𝗺𝗶

Cold. Everything was cold. And dark. I was so alone... how could I have wanted this? This couldn't possibly be better than before... the warmth, and the light, and the smiles, however scarce. I cried out. I screamed, but it was muffled. I wanted it back. I wanted everything back. I regretted my decisions, my plans, my dreams. I wanted a second chance. **Reborn as a ??? Sans**

(I do not own Undertale or the picture, they belong to their respectful owners.) In this AU, Error never left the Anti-Void. Error never remembered his past or anything before living in the Anti-Void. Only knowing he was a error, what The Voices told him, and how to talk and sleep. He never met Ink, never had the need to destroy worlds. All Error had was the Voices. Nothing but screams of how worthless he was and whispering of how he should give up. In this AU, Error never became the Destroyer of Worlds. All he wanted was to stop feeling so lonely, to understand and belong. Error wanted to leave the Anti-Void. But Balance is needed. Error never became the Destroyer, so someone else would have to. In this AU, Fresh is more vicious, more violent. He can feel anger, hatred, and jealousy. Fresh became jealous of all the other Monster's being able to feel happiness, being able to feel love. To be loved. He wanted feel that, but couldn't no matter how he tried. In this AU, Fresh became the Corrupter of Worlds. Spreading his fresh virus across the Multiverse, possessing whoever he wanted, and turning worlds into a fresh paradise. All he wanted was to feel happiness and love, to love and be loved in return. To stop feeling so empty. In one world, their romance would have many hardships, but still stay nothing but sweet. In this AU, their romance becomes twisted, unhealthy, and dependent. In this AU, the Multiverse will tremble before them.

reader is transported into an old au they made when they were younger read as they go through there daily life in a new form and dealing with new but familiar faces p.s this is one of my first fanfics that I'm posting so if you have any nice criticism I'll take it p.p.s this story is not gonna have much angst it's mainly just for shits and giggles because I got bored and inspired(hehehehe -from future) inspired by the stores "reincarnated as a voice" by IHamTiredAndBored and "reincarnated as sans from inclinetale" UmbraM4un by two great stories that I definitely recommend and on that note enjoy

(TW: unaliving thoughts and memories at the beginning. It gets better over time, don't worry! Trauma is difficult to overcome...) You didn't want a second chance. You didn't want to survive. You wanted the sweet release of death. But it seemed like the universe was far too cruel to allow you even that. It took away your memories, your free will to choose whether you live or die...hell, it took the one thing in life you owned! Your own name! And now it seemed like you had to live yet another cruel life, doing things you never wanted done to others. But...at least you could do things your way. Maybe this second chance wouldn't be so bad... (Reincarnated as Nightmare Sans, but unlike other stories, you have no clue what Undertale even is) (WE REACHED NUMBER 1 IN THE UNDERTALE TAG YOOOOOOOO) (9/13/25)

[ Sans AUs x Reader ] This wasn't what you expected - this isn't what you wanted. You wanted to rest, to finally, finally breathe, relax. But apparently life had other plans for your sleep deprived self. It wanted to trap you, it wanted to make you see - to make you realize, you're life isn't what it seems to be. You didn't want to take part in this chase - in this game. This isn't what you wanted. But this is what you needed. And some skeletons are here to join you for the wacky ride. I do not own Undertale, Toby fox does. I do not own any AU's in this story unless stated otherwise. I only own the plot of story.