Protecting my sister's rivals

A story told from the perspective of a heroine isn\'t telling the full story.

Our protagonist was unfortunate in becoming the \"rival\" and after being reincarnated (not in a new world) and...well some things linger.

**undergoing revision

Note: Hi! This is my first fiction and sort of a little project to improve my writing skills, please leave criticism! I guess this would be both a reverse harem and a normal harem? (lol)