Twice the Temptation by Rochelle Alers

Denise Eaton is proud of the day-care business she built from scratch. But now the scion of this Philadelphia family dynasty could lose everything. The man who holds the key to her future? None other than Rhett Ferrell, the man she passionately loved in college...and who broke her heart.
Rhett has waited six years to take his sweet revenge. Now the legendary corporate raider is about to have Denise right where he wants her -- at his mercy and in his bed. He's never forgiven her for walking out and taking up with his most hated enemy. But he's also never forgotten the desire that still burns so hotly, so irresistibly between them. That's when Rhett plots one final conquest: to take over Denise's heart. And he's a man who plays to win....

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