Humanity (To the Guest who asked about the Human AU)
Hi! If you left this review "Did you used to have an Undertale human AU or am I mistaking you for someone else?" this is my awkward way of trying to contact you. (Since doesn't allow replying to guest reviews.)
I did have a human AU once. It was called "Humanity" and if this summary sounds familiar that might be what you were looking for:
This is the story of Undertale...but instead of monsters all the characters of the underground are human beings with magical abilities.
It has been a year since the barrier was shattered and Sans and Papyrus have made a life for themselves on the surface. Sans is doing physics research at university, Papyrus works at Grillby's new restaurant. But life on the surface takes a lot of adjusting and normal humans are still suspicious of whomever is born with magic in their blood and soul. Things are looking up however, both Sans and Papyrus are making human friends...
I ended up taking this story down because looking back at it, it was a lot less polished than my other works (it hadn't been betaed and though I still really like the concept, there were so many typos and characterization issues). This made me wonder whether I should go back to improve it or just remove the story. Then I got a couple of nasty comments on it and I decided to just take it down.
If this really was the story you're looking for, I do of course have a copy myself. So if it's important to you somehow, you can PM me here or find me on tumblr at the url "undertalehappyfamily".
If it wasn't, I really hope you find it! In any case I hope you'll see this :P
-Freckle