The Test Subject (Sans X Reader)

Frisk was ten years old when she set the monsters free, it took them two years to be fully accepted by humans.

Six years later, Frisk disappeared. Leaving a note saying she has a family job to finish.

This caug everyone off guard. They thought she didn't have a family, as Frisk never even mentioned having one let alone even have a last name.

Two years after her disappearance Sans was sent a text asking for him to meet them at the train station.

He thought nothing off it other then if it was something risky he could easily teleport..