Between Courting and Kissing by Charlie Lane

To win her heart he’ll have to convince her he’s truthful. Unfortunately, he’s not.

A prim lady with mischief in mind. An American rogue with ink on his hands. A house party where everything that’s hidden will come to light.
Order should be Lady Prudence’s middle name. Unfortunately, it’s Anna, but that doesn’t stop her from making sure the little naughty lending library she helps run is perfectly organized. She’d be a happy spinster keeping everything just so if her brother would stop shoving eager suitors in her direction. Including the appallingly messy Benjamin Bailey, whose confidence would be… appealing if his beard weren’t so unkempt.
American Benjamin Bailey’s future name is Baron Brightly, but he’d rather not talk about that. He’s too busy running his printshops and trying to remember his schedule. When the Duke of Clearford offers to sell his shares of Ben’s favorite shop if he’ll pretend to court his sister, and discover her secrets, Ben agrees. Why not? The prim little lady couldn’t possibly cause any trouble.
But when fake courtship becomes real kissing at a house party for ladies who like their books slightly scandalous, Ben must decide what he wants more—a printshop that reminds him of home, or the love of a lady who makes him a better person.