Octavia Butler wrote these three books I read in a one volume collection called Lilith’s Brood. They’re sort of generational novels about humans who’ve been rescued by aliens after we destroyed most life on Earth.
In Dawn we follow Lilith as she’s awoken by the aliens on their ship and taught about what’s happened and what the aliens want them to do. See, the aliens want to incorporate humans into their genome (they’re biological collectors) and they want to put the humans back on Earth in a few carefully chosen areas so they can make them into something else. They’re totally fascinated by cancer, which allows the aliens to do all sorts of cool new things. Also the aliens have three genders including one that basically is there to manipulate DNA. The aliens want the humans to cooperate with them and choose Lilith to be their intermediary. By the end of the book she’s got the remaining humans ready to be rereleased on Earth, though she’s hated as a species traitor.
Adulthood Rites is about Lilith’s son and how he tries to get the rebel humans on Earth to accept their alien patrons. The humans who hybridize with aliens get to be practically immortal and have alien hybrid babies, while the ones who resist have all been sterilized and will grow sick and die. It’s kind of brutal. By the end of this book most of the resisters are sent to Mars where they can have children without interference from the aliens.
Then in Imago the protagonist is the first of the intermediary gender alien human hybrids that’s ever been born to a human mother who happens to be Lilith (families by this point usually have two human and two alien parents). This person is hated and feared and is desperate to find humans it can have sex with. By the end it does.
What I loved about the books was that they didn’t take the perspective of the human resisters. It’s always about the people who are adapting and accommodating themselves to the aliens, which is very interesting and different.
These books are weird because they’re pretty much all about the drive to procreate. Once the aliens get involved, people find the touch of their human lovers gross if they don’t have an alien with them. It was all very interesting but I didn’t quite get why everyone within minutes is pairing off and trying to repopulate the planet. It’s like there aren’t any other concerns that anyone has in these books beyond their bodily security and fucking. To me that’s weird, but that’s why I read science fiction.