My Hellion, My Heart by Amalie Howard

Lord Henry Radcliffe, the scarred but sinfully sexy Earl of Langlevit, is a beast. The only way Henry can exorcise the demons of his war-ravaged past is through intense physicality. In and out of bed. An endeavor that has no shortage of willing participants.
Intent on scandalizing London, Princess Irina Volkonsky is a hellion and every gentleman’s deepest desire…except for one. Irina knows better than to provoke the wickedly forbidding earl, but she will stop at nothing short of ruination to win the heart of the only man she’s ever loved.

But when one scandalous kiss makes dangerous passions ignite, neither of them can fight their sizzling attraction. When a sinister plot emerges to threaten them both, they will have to fight one last battle, this time for the ultimate prize…love.