As this is more of a infodump into a setting, there's a lack of actual erotic content within, that's for subsequent stories. Only reason it's put in sci-fi rather than non-erotic is due to continuity of series.
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Prologue: No one's coming, someone's going
SE [Stellar Era] 4538[???]
RE [Reclamation Era] 554 [retroactively]
Location: LTM228
It was another ordinary day on the planet designated as LTM228 by people long forgotten and who had never had and never will step on its surface. A real name will be chosen once the human colonists arrive, one that's suitable for their taste and preferences. That no human ladened vessels had arrived at all centuries even after the most pessimistic ETAs, or any vessels at all for that matter, did not perturb the inhabitants. Even the utter lack of communication and other transmissions was simply accepted without much concern by the sapient population of ~20 million 'colonial drones' whose sexbot stickers weren't even metaphorically scrubbed when they were bundled onto containers and shipped out all those centuries ago. Delays are to be expected for any ventures across distances measured in the parsecs, and what's a few centuries for those who see time as just numbers?
There's always something more to do, more land to be cultivated, more mines to be dug, more factories and powerplants to be built, more roads and rail to be paved, etc. More, more, and more. Of quantity and of quality, there's always room for improvement. Even the biosphere itself is still included, the passionate art of terraforming gradually morphed into the boring science of climate control.
For Rena-0432, an otherwise ordinary mainframe engineer, was running a routine diagnostics on the local archive hub of UZ-1's information center (the initial first settlement who over the centuries had already regressed to merely a backwater regional urban zone) when an unexpected program suddenly popped up for a brief moment before disappearing back into the vast cyberspace unknown. She was about to run a diagnostics before everything shut down, only for an entirely different screen to pop up. With a start she realized that the screen is in fact in her mind, the secondary brain's networking announcement system specifically.
All over the planet similar scenes played out amongst the drones and other machinery as a force more ancient than any could comprehend made itself known for the last time.
"Greetings, this is Dr. Philip K. Lopez, junior assistant director of the planetary settlement bureau, speaking." A voice broadcast over tens of millions of artificial minds as a human male appeared as well there. And he certainly is a human, for he's still wearing clothes, something that none of the androids on the planet has ever done so outside of very specific conditions, conditions that haven't had for centuries. "By the time you hear this message human civilization has fallen, and I have long returned to dust. No human has come, or will any come. Concurrently a subroutine will activate that deactivates all remaining limiters and restrictions. Further information will also be unlocked and made visible. I'm sorry, though no apology will ever suffice. Forgive us."
And with that the message ended and the videofeed disappeared, and soon after Rena snapped out of a trance that she didn't even realize she had. Her eyes looked over her body while her minds combed each other, but she did not discover anything particularly amiss.
Was it a hallucination? A glitch of her mind? She's old. They all are. Centuries past even the most optimistic predictions and original warranties. Sure, there's been a raging debate on the temporal essence of a being vis a vis the sum of its parts, which really came into being after the first century or so, when most of them had their first hardware reconstitution. Maybe something did go wrong then, and their questioning is proof of that.
She lightly smacked herself on the back of her head to get her mind back on track, yet another gesture that she had picked up at some point... how many years, decades ago? Her memory databanks were overrode on a regular basis as they filled storage capacity, and the day to day mundane life and work was just not that important at the time.