Odder Still

Rubem of No-Man's Land was content keeping to his wine, his pets, and his extensive collection of fishnets.
But since a sentient, fuel-producing parasite bonded to his brainstem, every morally-depraved scientist and hardcore rebel for a hundred miles wants to ruthlessly dissect him. The parasite itself is no better, influencing his emotions and sassing him with his own memories as it slowly takes over his body.
The only person offering Rubem help is Tavish K. Findlay, a dashing and manipulative philanthropist whose mother's fuel company monopolizes their corrupt underwater city with an iron claw. She desperately wants to tear Rubem apart for the parasite before those who oppose her can do the same. Her son is irresistibly charismatic though, and after a lifetime of being kicked out and disavowed, Rubem is desperate to believe in the friendship Tavish offers.

With revolutionary plots and political schemes tangling his every choice, Rubem must soon decide whether or not to trust Tavish in his fight against the parasite's growing control.

Odder Still is a M/M fantasy novel with a biracial and class-crossing slow burn romance, murderous intrigue, and a Marvel's Venom-style parasite-human relationship in an underwater steampunk city. It is the first in a series, each with a romantically fulfilling ending and a final HEA, with steamy thoughts and foreplay but no explicit sex. (Content warnings for alcohol consumption and animal death.)