Multiversal Dilemma <Au sans' x reader story> ((Slow Updates!))

A problem in the multiverse causes the sans au's to come together. With the help of (y/n) and friends, can they save the multiverse from destruction? Find out!

<This is a female bias story>

-All of the characters mentioned in this story belong to their rightful owners. Though my own Au's and characters will be included-