Erased.

Erased. is a very fandom-y AU concept partially inspired by the original Ink Sans comic.

Story
An Undertale fan makes an AU where everyone's always happy and there's not much conflict and that's literally the point of it. Naturally, writing that project was boring, so the AU's creator (or some unseen AU controller) cancelled it. In this canon, when an AU is cancelled, never to be touched again, the world freezes and whites out until nothing's left.

The world froze, and started whiting out starting in the Ruins and deleting the less important concepts first. Sans, at the time, was in the Last Corridor, and was considered one of the most important characters, so he'd be the last thing in the world to be deleted. But then, strangely, Sans actually woke up from this strange paused place. He noticed something was off, he seemed to be the only animate thing in the world. He went back to Snowdin to see the whiteness taking over, erasing every little thing like it was never even a concept. He'd never seen anything like this, and he knew if he stayed here his time would be limited.

But Sans had another goal in mind. He wanted to save his brother from this event, but who knew if he was even still there. Fortunately, due to the way this works, the more important characters aren't deleted right away. Sans ran into this seeming void, thinking of the last place Papyrus could've been. After a while, miraculously, Sans found Papyrus. Kind of. He was pure white, blending in with the empty background, but it was definitely him. Sans knew he had to get him outta there.

Sans brought Papyrus to the lab behind his house, now completely white but still in tact, and conveniently enough in this AU the unseen machine is an untested device which can allow one to supposedly travel through worlds. He had no idea if it'd work, but he had to try. Sans used the machine and it made a portal to another world. He brought Papyrus with him, and when Papyrus left the world he was being removed from, he animated once again, into his normal, goofy self... Except he was still pure white, everything about him was blank looking, but he was alive.

and im cutting this off here i did more in my brain might put that stuff later