Wish Upon a Coin

Alice, the oldest child of four, was diagnosed with a sickness that changed her life. She was left with no energy, no smiles, none of herself anymore. Her sister makes a wish at a fountain in the early stages of Alice's sickness, pre-diagnoses. A mysterious guy, determined to make Alice better, shows up around the same time.

My name is Rowan Percival Wentworth. Quite prestigious, I'm aware. Why my parents chose that name, I will never understand. Something like "family tradition" or "honor" or along those lines.
There's a fountain near where I live, and I like to hang around and grant the wishes I hear. You could call me a sort of genie if you want.
The other day, a little girl and her sister came to the fountain. Her sister looked tired and weak, but the little girl? She was a ball of energy. Her wish was that her sister would get better, and so began my mission. To get this girl to smile.