Start with high-confidence billionaire romance books, then narrow by subgenre or adjacent topics.
The Duke and I
Julia Quinn, Rosalyn Landor
The Duke Gets Desperate
Diana Quincy
The Kiss Thief
L.J. Shen
Restore Me
J.L. Seegars
Now You're Mine
Morgan Bridges
Once You're Mine
The Stopover
T L Swan, Sebastian York
The Takeover
T L Swan
Twisted
Emily McIntire
The Do-over
King of Envy
Ana Huang, Jason Clarke
