Undertale Fan Fic

This is a fan fic so if you don't like don't read...... Oh and in this Frisk is a female

Many human years after Frisk left the Undergrownd she is now a fully grown adult and has a family of her own two twins, the oldest Vinyl and her younger brother Sam. Frisk always tells the two children of her time in the Undergrownd and the friends she made. One day Vinyl and Sam go mounting climbing at mt ebott they come across the hole to the Undergrownd. Vinyl wanted to turn back but when Sam falls in Vinyl will do anything to get her little brother back from the evil that now runs the place they once heard happy story's about.