Sans AU X Reader

Nightmare's creation {My AU + OC's}
You and your friends were created by none other then the Negative/Nightmare King himself Nightmare Sans, you were his favorite while the others where not, Nightmare barely let you meet his gang to keep you safe until the Sanses think Nightmare is acting weird?..
why was Nightmare diffident
why were you his favorite?
just why?...
read to find out My Moons
Amelia-Chan out~