Butterfly Curtains - Undertale and AU's FanFiction

Classic Sans has been missing for years, and none of the AU's know where the chill, spunky, Original version of themselves as went. All ways to get to his world have been blocked off, and there have been no other ways to get to his world discovered. That is, until, Ink, Dream and Nightmare all got into an argument.

When the worried AU's finally reach the world of Classic, what will they discover? What will they encounter in this very much altered universe that has them questioning whether or not this is actually the original timeline- and, better yet- what will happen then they encounter their long lost contact of a friend again and discover just how broken he really is?

The world of dreams is a strange, and magical place. Too bad no one ever said it was always a good one.