Divaricated

"In the dying months of humanity's resistance efforts against an overwhelming alien invasion, a struggling, depressed Jump Technician aboard the Terran Catastrophe-class Battlecruiser Indomitable meets a hypercompetent alien bioengineer with self-confidence issues and a lifetime of trauma to deal with. In the ensuing chaos, they end up stranded alone in distant space with nobody to save them but each other.

Set in the 'Human Domestication Guide' shared universe, a kink setting with far more worldbuilding than you'd expect focusing around a precursor race trying to save the universe the only way they know how: individual love, care, and attention for all the beautiful and diverse creatures within it. Also turning a bunch of them into blissfully controlled obedient pets." -AO3

"Much like other foundational stories, Divaricated established huge swaths of the setting’s lore, from hyperspace to body modification to biorhythms. It expanded on and established much of Affini ship culture, and illustrated the diversity of florethood - once you’ve met one floret, you’ve met one floret." -humandomestication.guide