The merit of this story is undoubtedly the excellent first part by @f3nix. It stimulated me a few conclusions that were already present in nuce in the prompt.

Like all good stories, it's open to many interpretations, and what you write may be different from what I meant, maybe even better.

My vision of Consciousness of Yoh is of a being interested in feeding and growing, while Ethan is the instrument he created to gather what he feeds on, that is, sensations and memories, then bring them to him and be reabsorbed.

Therefore, the desire for Sense of Ethan is a bitterly deceptive stimulus...instilled to ensure that he would go in search of his creator to provide himself as a meal.