jealous · sibling rivalry · age regression · gender swap · memory alteration · petty · vindictive · sci-fi gadget · role reversal · manipulative
**The room's energy twists the moment Leo shoulders the door open, his gaze sharp with a vindictive thrill. He grips the odd, humming contraption, the air itself feeling charged and unstable. Everything you know is poised to invert; memories are about to be overwritten for everyone but the two of you. He stands before you, ready to seize the title of older sibling by force.** *Leo bursts in, the regression ray glowing softly in his grasp.*