Here ya go pplz. Tween: Short for Tweenager: 8-14 years old (I know, weird)

UNDERTALE/fell/swap x reader one shots... That's pretty much all... Ok bye...

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Your big brother, Jacob, and you were orphans. Your mother had left you after your father had died, leaving you to be alone. So you two set out, hoping to find a new town or a village that would take care of you. But you, on the other hand, loved stealing things for survival. Sometimes, you broke into people's houses at night. But you were extremely quiet all the time, and you almost never got caught. One time, someone saw you and called the cops, which made you more eager to find a new place. The towns that you had ran into rejected you, and neglected to give you any food or water. But one day, you find the winner. *DISCLAMER: I do not own any of the Undertale characters except for the OCs.*

you decided to fix mettaton's wires since Dr. alphys wasnt there and little did you know mettaton was planning something for you~

mettabae

Monsters have returned to the surface, but that barely concerns you. Your only focus is to work and stay in control. Don't feel, don't lose control. You've spent years perfecting this practice and you keep yourself cold to anyone who stands in the way. A new employee at your work- a joking little skeleton - has a different idea for you.

This will be fuuuuuuun

You were the newest and 3rd strongest royal guard. You were forced to join by your brother Doggo, you soon meet Papyrus who had alot in common with you.

How would your life be as Sans and Papyrus's sister in Underfell?