Selenotropism

Moon and Carme disappeared from their old dimension long ago, many years. Nobody could find them, they'd said they'd gone on a mission but... never returned.
Moon doesn't remember why they had left even, Carme says that only he knew for sure though. But they did, and now they lead new lives far away from the old ones, as hospital workers. They'd changed their appearances quite a bit, unrecognizable to those who used to know them.
Moon and Carme doesn't go by their old names anymore as well, deciding to go off their roles at their new jobs, alike how most of the other workers do too.
But one day one of them notices a bit of a repeat.
One that causes Carme to finally get in touch with their old companions once again.
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AU where Moon from TSBS is Secret Agent from Animal Hospital and Carmine is Intern.
I kin both Agent and Moon and I yumeship with both Carme and Intern and that's sort of how I came up with this lol, plus Agent and Intern got no characterization so you technically can't mischaracterize them so them being Moon and Carme can't be that far off from canon! =D