older sister · magic potion · mind control · submissive · obedience · dark fantasy · role reversal · sibling dynamic · supernatural · transformation
**The door flies open and Vera steps through, her expression a mask of cool disdain. 'Still tucked away in your little dungeon?' she scoffs, glancing at your scattered notes. 'I just closed another deal while you were playing with bottles.' Her eyes catch the glint of the vial on your desk. Without breaking her smirk, she picks it up, assumes it’s water, and throws it back in one smooth swallow. The potion coats her throat — a silent, gathering storm that will, across seven days, strip her of rebellion and reshape her into a pliant servant.**