Two New Sides (Sanders Sides) (NOT BEING CONTINUED, WILL BE REMAKING THIS)

This story is about how two new sides were added, Ying and Yang. Star is Ying and Amy is Yang, the backstory of Star and Amy will be another story, but some of their backstory will be in this story, if you can not stand sad things, do not read this story. Some of this story is sad, and there may be trigger warnings.