I've done nothing to these pictures but I saw them and they screamed a prompts at me:
Andy is the twins fairy godmother or fairy godmother-in-training, to pass a test she needs to grant them a wish (one for both or one each). The twins are tired of their mother being unhappy so they want Andy to find Miranda someone to be with. But as she does find someone who's nearly perfect for Miranda she falls in love with her as well.
Second prompt, think Little Mermaid, but without the Hans Christian Anderson sad ending or as much music as the Disney version. While out on vacation somewhere Miranda almost drowns but Andy saves Miranda's life even knowing what she's like to people outside of her family. She's spied on Miranda and the twins and has seen the love between them. The author doesn't need to make Andy mute like in the Disney version she could be sworn by magic to never tell anyone about being a mermaid. Bonus points for somehow still incorporating Nigel and Emily...lol.
And last but not least, in the holiday spirit here's a Christmas prompt. Andy is the daughter of Santa Claus and has been charged a mission in order to take over her fathers' duties, she must introduce holiday cheer into Miranda's life and get the twins to believe in Santa, she has one full year in which to complete her mission. So she decided to get to know Miranda better by working for her as her assistant.