Sans and Papyrus: The Past (An Undertale Fanfiction)

~~Undertale belongs to Toby Fox! The Cover Photo Belongs To Its Original Creator!!~~
Sans, the eldest brother, must care for Papyrus, his baby brother. Their father, Gaster, works as the royal scientist for the King of the Underground. Years later, Papyrus and Sans slowly forget. How did it end up like this? Find out in, Sans and Papyrus: The Past (An Undertale Story)!