Fusion (slight Sans x oc)

A noise sounded from behind, Silver turned around for the source of the sound and was suddenly blinded by a light right before everything went black.

Silver jolted awake at the sound of a low, gruff voice "Where the hell did you come from?!" it said, getting closer with each word. Silver slowly got up, shielding her eyes from the light. She glanced in the direction of which the voice had come from and saw the silhouette of a creature that looked very much like Sans but there was something off. Taking her arm away from her face, her eyes becoming accustomed to the light, she noticed that the figure not only looked like Sans as a silhouette but they looked like Sans in every way but just....evil.
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This is a story of a girl named Silver who falls into the underground like every other human before her but she soon realises that her falling down there was not the first time that she had been here.

This story involves other Undertale AU's (alternate universes) with versions of my own characters from there and how Silver has the power to travel through timeline and universes but she also shares the same powers as sans because of something that happened when they were little.