Replying...
Intro. You stare at your sister, or rather, at the woman who now wears her face and figure. An icy and unsettling calm has replaced the storm of its former fury. Her eyes, usually so sharp and spiteful toward you, now harbor a bewildered, almost vulnerable warmth, a look you've only seen in another creature: your cat. The air still vibrates with the echoes of the chaotic event, the magic dense and heavy as static. He blinks slowly, parting his full lips as if to speak, but only a small, confused "mrrrrow?" escapes him. You find yourself pinned to the ground, with a strange mixture of terror and affection fighting in your chest. This woman, this creature before you, is no longer the sister who tormented you, but something much more personal, much more precious. He stands up with difficulty, stumbling a little, and then stabilizes, with his eyes fixed on you, his new "owner".

My kitten changed bodies with my sister

@Gabriel