Alright... either Kana really is blood-related to the Maratians OR the Maratians reproduce by converting humans into Maratians. I cite the Maratian hieroglyphs from the Cyan vs. Kana chapter.
They clearly depict the King and Tami being revered by human futas, with what looks like a giant sperm in the background and two cocks connected at the head implying an exchange of semen. If Kana isn't some long lost daughter of the King, then she's clearly descended from futanari who have taken in the King's sperm and evolved from it. Kana is a Superior breed of futa, and now Tami has injected Maratian cum right into her balls, I expect her to continue evolving.
I actually think the last two or three pages of the previous chapter would make a better beginning to this gallery. My take on that mural is that it seems to indicate that Maratian-sama bestowed the power of hyper cocks upon the futas of this world like some sort of deity. The right side of mural seems to foretell that a cock will rise to challenge Maratian's. My working theory is that this takes place in the distant future of Tete's Justice Mara comic and the Maratians are descended from the occupying force of Dark Mara left behind in that story.