Mischief and the Marquess — Sylvia Day

Justin, the Marquess of Fontaine and Lady Sophie Milton-Riley have no desire to marry. To satisfy their mothers' insistence that they would be quite right together, they set out to demonstrate how completely ill suited they are for one another. Justin is allergic to her perfume. Sophie dislikes his dogs. He prefers blondes; she, brunette men. But the more they seek to prove how wrong their union would be, the more right things feel. And when opposites attract, there's no denying the sparks or the heat...