Lady Sophia's Lover by Lisa Kleypas
Lady Sophia Sydney would do anything to ensnare the unattainable Sir Ross Cannon. Her goal: to ruin his reputation and cause a scandal that would be the talk of all London. So she insinuates herself into his life by gaining his trust and living in his house.
What I Did for a Duke by by Julie Anne Long
For years, he's been an object of fear, fascination...and fantasy. But of all the wicked rumors that shadow the formidable Alexander Moncrieffe, Duke of Falconbridge, the ton knows one thing for certain: only fools dare cross him. And when Ian Eversea does just that, Moncrieffe knows the perfect revenge: he'll seduce Ian's innocent sister, Genevieve.
Monster in His Eyes by J.M. Darhower He wants revenge for something her parents did.
Dark Angel by Mary Balogh
Gabriel, Earl of Thornhill, has just returned to England after a long stay in Europe, where he fled after a scandalous elopement with his father's pregnant wife. He is not in high favor with the ton, but when he sees that Lionel is also back in town, he is willing to risk further trouble for himself by causing harm to his old enemy in any way that presents itself...and Lionel has a new fiancée.
Temptation by Charlotte Lamb.