The Devil's Submission (Fallen, #2)

Disinherited by his parents and estranged from his wife, Fallen pleasure club co-owner Lord Grayson ‘Devil’ Deveraux long ago learned to place his trust in ledgers rather than people. But his ice-cold reserve hides the scandalous truth: he’s a man who craves pain with his pleasure, and a loving lady to instruct him.

Banished to the country when her whirlwind marriage collapsed, Lady Eliza Deveraux never knew why Grayson fell out of love with her: she’d tried so damned hard to quell her fiery self and be a proper, obedient wife. But when Eliza is forced to return to London and back into Grayson’s intoxicating world, banked passions reignite. Can a marriage built on secrets and pretense truly get a second chance?

Fun fact: the Fallen pleasure club is inspired by three real-life Regency-era clubs in London. The White House in Soho Square (madam Theresa Berkley specialized in flagellation, birching, caning etc); The Nunneries in King's Place (madam Catherine Windsor, very exclusive and a favorite of royals, MPs, diplomats, and peers); and Miss Fawkland's Temples in St. James's St.