Basically, Sci Twi is an intern in astronomy, but of course being her she’s as educated in the matter as an astronomer would be, and one night something crashed into her attic-laboratory. That something being some sort of alien creature, which is who Sunset is.
IDK what kind of story they could follow, for now, Twilight keeps her as her own experiment because authorities refused to believe of her reports of “malicious-looking, yet harmless looking creature falling out of the sky”. Oh yeah, and also sweet bacon alien has a crush on the kind scientist
EDIT: The design was inspired by this (I do plan on changing the designs in the future, this was honestly just a dump that I had on my mind for weeks)