Sans has watched as everything repeated over and over again. So has Frisk. Sans gave up a long time ago. Frisk, she still has plenty of determination. They couldn't end the loop on their own. But maybe, they could end it if they worked together? Female Frisk. Possible future Frisk/Sans.

{WARNING: This fic is INCREDIBLY old, has godawful typos and isn't finished, nor may it ever be completed.} A year passed since Frisk freed the monsters from the underground. They now live with Toriel, and every day is a new adventure as they do their best to help their new friends adapt to living on the surface.

[Spoilers For Entire Game] "If we're really friends, you won't come back." After sparing the final boss and facing the consequences for their actions up 'til then, the fallen child takes those words to heart and resets. The next time will be better, but a question still lingers: what does it mean to be "friends"? If they keep going, maybe they'll learn the answer...

Sans had plans to go on a road trip one day to see where all of the shortcuts in the world lead to. It could be dangerous and it could take a long time to do. Frisk, just graduated from high school, decides that this is a great summer vacation opportunity. (Romantic Sans/Frisk Asexual Relationship)

Now that Frisk has had their past settled it's time for the present to move forward into a new future. Queerplatonic Sans/Frisk (This story is a mixture of prompts but it's all chronological and will be written as a complete story. Prompts will be inspiring various things in various chapters. Part 7 of my Undertale Series) (Cover Art courtesy of dogpu on tumblr!)

A companion fic for "Time Marches Forward (Finally)" with scenes from the story seen from Sans's POV. I would recommend reading it first. For obvious reasons. (Queerplatonic Sans/Frisk) (Cover Art courtesy of dogpu on tumblr!)

Frisk falls down into the Ruins, but when they try to speak to Flowey, he doesn't understand them. Now he's on a journey through the Underground with this kid, and sometimes they get this weird gleam in their eyes and it looks like they're talking to themself. He doesn't have time for this when there's a couple of human souls that need to be stolen.

(WARNING: Reading this story may spoil the game for you.) It's a beautiful day. The birds are singing. The flowers are blooming. Perfect weather for playing catch... It's on a very day like this the monster race finds themselves finally free! Unfortunately, that "freedom" is at best- a gilded cage. The game is over, but can they still manage to find a happy ending?

What if instead of the Frisk we know, there was an even younger one who became lost in the Underground? This time a five-year-old Frisk who is nothing but a scared child is the one destined to save the monsters and free them...she ends up changing quite a lot in this world. Besides, even if she's scared, she's DETERMINED to save everyone!

Sans does some introspection. He hates introspection. (Part of the Road Trip AU. Sans/Frisk. Asexual Sans and Ambiguous Gender Frisk. Technically a prequel of "Where in the World are Sans and Frisk?". Oneshot.)

This is an Underfell fanfic. NSFW will come eventually, I'm not sure how explicit it will be but it will be tagged the heck out of. Sans/Reader. Abuse/Abandonment/Depression are some of the heavier themes here.

Sans is definitely used to disappointment by now. No matter what pattern begins to develop, he always knows how his life will play out, one way or another. But it becomes harder to predict when an unexpected anomaly gets thrown into the mix, an anomaly that could unravel everything Sans has ever known to be true, and remake it into something tragic...or something wonderful. Sans/OC

Frisk comes down with pneumonia and they are very unhappy about it. The monsters try their best(?) to help. (Part 3 of my Dreams of the Past and Present series) (Cover Art courtesy of dogpu on tumblr!)

You blamed yourself for what the other you did, and you had a plan to fix it all. Sans should be happy with your decision. After all, you killed his brother didn't you? So why did he stop you? Why did he take the knife away? You just wanted the pain to stop. You didn't anticipate him saving your life. Contains mentions of self-harm and suicide. Now multi-chapter

Sans and Frisk have a midnight talk about the SAVE. Sans is unhappy. This kid is lucky he loves them so much. (A side-fic that takes place during chapter 13 of my story "Frisk" Pt. 5 of my Dreams of the Past and Present series) (Cover Art courtesy of dogpu on tumblr!)

It's Frisk's birthday and it's time for some fun! (We now know about Sans's past...but what about Frisk's? As Asriel asked: why did Frisk climb Mt. Ebott? Well, they have their own reasons.) (Queerplatonic Sans/Frisk. Trigger warnings of emotional abuse. Rated T just in case. Part 4 of my Undertale Series but can be read alone if you want.) (Cover Art courtesy of dogpu on tumblr!)

Sans is gonna give whoever is bullying Frisk at school a bad time. Gender neutral Frisk, post pacifist run.

Sans sends Frisk off to get ice cream while he talks with Frisk's parents. Nobody is happy about this situation. (Takes place during Ch. 12 of my story "Frisk". Read that for context to the situation. Or don't. I'm not the boss of you. Pt. 6 of my Dreams of the Past and Present series) (Cover Art courtesy of dogpu on tumblr!)

You both knew you would talk about it one day. Innocent curiosity had brought that day a lot faster than either of you had planned for. (Takes place after Night Terrors. Sans/Frisk) (Cover Art courtesy of dogpu on tumblr!)

Based on the prompt "Person B has been having nightmares so person B borrows person A's shirts, which has been helping them sleep." with Frisk being Person B and Sans being Person A. Sans/Frisk. 2nd POV. Can be seen as brotherly or romantic. Post-Pacifist ending. Spoilers to various endings. (Cover Art courtesy of dogpu on tumblr!)