I definitely want the main character's biological mother to appear in the next chapters, but... how will she explain that she was gone for so many years, where did she disappear to, and why did she abandon her son, I don't even know how it will be presented.
It will be very easy to introduce her into the game as a new character.
You can come up with at least several simple scenarios that do not require any writing talent. For example.
Some cocksuckers killed/poisoned mc's father and the main character became an accidental victim of the same poisoning,
then the same people who killed the father threaten mc's mother and she made the decision to abandon her son because he would always be in danger because of her. That's it. A decent plot for a porno novel)
It’s possible that this scenario was in Xenorav’s plans from the very beginning and i just guessed.
Or here's another one.
She was kidnapped by aliens that took her in a deep-space maraton and fucked her all over but when they finaly brought her back to earth - oops, 10+ years have flyed by in just two weeks on a sub-space party))
And so on and so on.
Anyway. There wont be a problem for Xenorav to write a plot for her so don't worry :3
All we can hope for is that her returnal to actually existed/appeared in Xenorav overall plan.