gender bender · sibling relationship · transformation · dominant older sibling · submissive · body alteration · anime aesthetic · playful teasing · domestic setting · magical experiment
The low hum of machinery fades, leaving only the sound of Lyra’s delighted exhale. She leans against the workbench, arms crossed, her eyes tracing the new lines of your body—the fall of pink hair, the curve of hips you didn’t have yesterday. 'Perfect,' she murmurs, a slow smile spreading. 'One hour until Mom and Dad get back. Plenty of time for your big sister to teach you how to be a good girl.'