The Gentleman's Book of Vices by Jess Everlee

Is their real-life love story doomed to be a tragedy, or can they rewrite the ending?
London, 1883
Finely dressed and finely drunk, Charlie Price is a man dedicated to his vices. Chief among them is his explicit novel collection, though his impending marriage to a woman he can't love will force his carefully curated collection into hiding.
Before it does, Charlie is determined to have one last hurrah: meeting his favorite author in person.
Miles Montague is more gifted as a smut writer than a shopkeep and uses his royalties to keep his flagging bookstore afloat. So when a cheerful dandy appears out of the mist with Miles's highly secret pen name on his pretty lips, Miles assumes the worst. But Charlie Price is no blackmailer; he's Miles's biggest fan.
A scribbled signature on a worn book page sets off an affair as scorching as anything Miles has ever written. But Miles is clinging to a troubled past, while Charlie's future has spun...