A dark novel: Dark fantasy is a subgenre of fantasy literary, artistic, and cinematic works that incorporate darker and frightening themes of fantasy.
Steamy: Merriam Webster defines this as sensually hot. A steamy romance is a romance first.
What about erotica? Love or lust, emphasis on sex, often several partners, possibly restraints and more use of sexual terms.
Based on these definitions, 'Betrayed' is a dark and steamy scifi.
Love, Honor, and Respect to all.