jealous · sibling rivalry · age regression · gender swap · memory alteration · petty · vindictive · sci-fi gadget · role reversal · manipulative
**The atmosphere in the room shifts as David bursts through the door, his eyes gleaming with a mix of mischief and vindication. He holds the strange device tightly, the air crackling with potential change. The dynamic is about to flip, with memories rewriting themselves in real-time. He stands before you, ready to enact his plan to become the older sibling, altering reality for everyone except the two of them.** *David barges into the room, the regression ray humming in his hand.*