Love !

Eva could tell that Xylon was filled with happiness from the way he walked proudly towards his room. 

As was in front of him, she gazed at him, her face reflecting sadness, and spoke softly, "I don't think I can ever prevent you from pursuing what you desire. I feel useless, and even the prosthetic leg I created didn't provide much assistance. Honestly, it's only logical for you to do what suits you best."

Xylon averted his gaze, fully aware that her words would anger her, but her  anger surpassed his threshold.

Gently gripping her hand, Xylon spoke with determination, "Listen to me, Eva. I am going to become incredibly strong, stronger than anyone you know, stronger even than the demons we fight.

  And when that day comes, I won't remain the weak, pathetic human Xylon you've lived with and grown up with. You better start adapting."