Sherry Thomas - Ravishing the Heiress

Millicent understands the terms of her arranged marriage all too well. She gets to be a Countess by marrying an impoverished Earl. And in return, the Earl Fitzhugh receives the benefit of her vast wealth, saving his family from bankruptcy. Because of her youth, they have agreed to wait eight years before consummating the marriage—and then, only to beget an heir. After which, they will lead separate lives.
It is a most sensible arrangement. Except for one little thing. Somehow Millie has fallen head over heels in love with her husband. Her husband, who has become her very best friend, but nothing more…Her husband, who plans to reunite with his childhood sweetheart, the beautiful and newly widowed Isabella, as soon as he has honored the pact with his wife…
As the hour they truly become husband-and-wife draws near, both Millie and Fitzhugh must face the truth in their hearts. Has their pact bred only a great friendship—or has it, without either of them quite noticing, given rise to a great love?