Flipped personality: a yandere simulator (and others) fanfic *EDITING

Yandere-chan has always loved senpai. It has been a race to finally be his, and now she has done it. Yandere-chan is senpai's girlfriend! she couldn't be more thrilled...on a normal occasion.
Bill cipher has come out of his den because of a simple mistake that a certain "dark one" has made and it's up to Yan-chan to fix it.

DISCLAIMER! I DO NOT OWN ANY OF THE CHARACTERS!