At the Duke's Service (The Notorious St. Claires, #0.5)

The last thing Alexander St. Claire, Duke of Stourbridge, expected was Angelina Hawkins arriving on his doorstep ready to become his mistress! He thought his ward was a little girl, not a beautiful and bold young woman with uncanny knowledge of the arts of seduction. Alexander knows he should resist, for it would be only too easy to lose himself in her forever...