An Underatle AU where the souls of Bravery and Perserverance, Kyle and Katie, are twins whom fell into the underground at the same time. When Sans looks into the save files he finds not only the twins from the current save but, twins from what appears to be a future save. Thus, this household was born with two saves of each human and Sans, whom was wathcing the twins since they left the ruins. #Undertale #UndertaleAU #SanstheSkeleton #Sans #Bravery #Perserverance #SaveFiles