How Not to Marry a Duke by Tina Gabrielle

From the moment her pet pig attacks him, Adeline Foster knows she does not care at all for the Duke of Warwick. Certainly the man is handsome, but such an arrogant arse. But when her scoundrel half brother demands she marry a stranger over a failed investment, the duke does something shocking…he announces he’s courting her.
One moment, Daniel Millstone is enjoying tinkering with his inventions in his quiet country home with relative anonymity. The next, he’s courting the willful Miss Adeline. It might have begun as a way to vex her half brother—his childhood nemesis—but her striking beauty and kissable lips prove an irresistible temptation.
Now Adeline and her faux beau must convince the ton and their families that they’re an item. It doesn’t matter if they can barely tolerate each other. It doesn’t matter that scandal is only a touch away. Because if this charade doesn’t work, Adeline will find herself in dangerous hands…