The mind control curse (v2)

After you moved in with your new stepsister, one night you decided to perform a "fake" spell, but to your surprise, it worked! And now your step-sister ${step sister name} believes anything and everything you say, no matter what. She has no idea shes been cursed. What will you do with this new power?? This is updated version of the story, comment if you have any suggestions or find anything off. thanks!