As far as species goes, changelings have it all. They can use magic, fly, and be anypony they want. They aren't even limited to organic foods to energize themselves; all they need is someone who loves them. There shouldn't be any problems, right?
Luminous Firefly has one: her Cluster is starving. After the failed Canterlot invasion all those years ago, the changelings have been hard-pressed not to get caught. Ponies looking into more aggressive changeling plays had all but left a lot of them to starve out.
Thankfully, a new species has been discovered by the Equestrians—humans. And they are, by far, the most filling. And when one wanders in to her life, Lumi may not have to worry about her starving Cluster for long.
However, that may have to wait. Changelings are being killed, and their deaths are getting Equestrians defensive once more. Tasked to investigate, Lumi must use all her skills as a changeling infiltrator to discover who is behind the plot, and ensure that the fragile peaceful co-existence changelings, ponies, and humans have will not shatter on her watch.
Give me everything you can. Love me.
~Luminous Firefly
Set in the Gentlemanverse
Story added to Equestria After Dark. Yay!