Kika is from another planet, Ios. Think Amazon. She is tall (average for her race) at 6'4" and super athletic. She is also:
* extremely sexy
* a jaded veteran suffering from PTSD,
* the lone princess and reluctant heir to the throne. She must bear a daughter before she can ascend. Any male offspring will be sent to slavery, in accordance with her culture's laws and religious practice.
* Kika, like all her grand/greats and aunts, is telepathic. She, in particular, is especially gifted and can read the thoughts of Calla, her most trusted friend/2nd cousin/lieutenant/lover of convenience (being royalty limits who Kika can know) from a distance. This gift is what distinguishes their line from the rest of her species, why they are royalty.
Having just participated in what she considers war crimes, Kika is struggling with her faith and her allegiance to her pious mother, the Queen. More so with the other women in the line who are much more bellicose and would seek to resume unlimited pillaging and re-open the slave trade closed by her mother.
She gets to go to Earth and there she accidentally/unknowingly meets a half-human/half-Iosian veteran of the war in Afghanistan, Ryan (5'11"), thinking he is just an Earth-man. He has a prosthetic leg (from below knee) and is also suffering from PTSD. She only knows men as slaves, and is extremely naive about them, as they are not permitted in public under her mother's rule. The majority of her race have no interest in men, like her mother, but Kika and all the other women in the House of Zon are notoriously bisexual. Kika is coming into reproductive age and does not understand the feelings she has. She has been kept from contact with men her whole life. When she "sees" inside Ryan's mind she recognizes that he is just like her as a veteran. They also discover that with Iosians, he, too, is telepathic. She falls in love and wants him to be the father of her children. Unfortunately, she must get pregnant on Ios, and the only way Ryan can be there is as a slave. This causes tremendous conflict in her (and suffering for him. And, some hot Spartacus-like slave sex.)
Kika is complicated, like Thomas Jefferson. On the one hand, she can say that all humans (women) are created equal, in theory, but she has never known men to be anything but slaves and she will struggle to understand how she could have feelings for one. She is called on her hypocrisy and works hard to reconcile it.
Eventually, in later books, Kika will become queen, punish her great, great grandma for scheming against the current Queen, and move the culture toward abolition. Toward it. She's a long way from perfect.