Fluffy organs for humans or fluffies? Cuz the idea of fluffies being able to swap out organs and limbs fairly easily isn’t too uncommon a trope. I can’t think of an example of it being used explicitly for abuse purposes. Usually it’s simply a “service” that ends up as industrial sadbox.
Though who cares about originality. You do awesome stuff, Moon. I’d LOVE to see your take on this idea 