The Rules of Writing Yandere

6] You wanna play hard to get?

In case your main character isn't into the yandere, or isn't even pretending to be, then why not have your precious yandere show them what happens when they ignore their unique love?

Kill anybody with whom the main character may be romantically involved with until they understand that MC + Yandere = meant to be.

Oh, that was their uncle....? Well damn... He was still flirting! KILL HIM!