Got a novel here for you with...lots of world building and science.
Title Rain
Genre: Sci-Fi Romance (Futurism romance)
Earth was ruined by climate change which caused all sorts of crazy changes to Earth's weather, topography and climates and biomes, so people had to adapt and change so using the doomsday bunker (which is real by the way, look it up) humans altered their DNA with animal DNA that are made for the new harsh world.
The story follows a socialite boy from the ocean based city/country wakes up one day to find himself engaged to the wealthy, powerful daughter of the richest family of the desert based city/country and the two find themselves embroiled in a very, very passionate relationship as they discover they are far, far closer than they ever expected.
The two families are based on some of my personal favorite animals: the oarfish and the horned viper