Forbidden (1997)

Jack Learner, a cog in the wheel at an advertising firm, is hoping for a promotion when he accepts an invitation to a party at his boss's mansion. Jack is surprised when his boss, Clark Hillman, assigns him a special job: entertaining his daughter Tracy while she is in town. Before leaving the party, Jack is seduced by Charlene, a sexy woman in her early forties, who takes him home with her. An affair follows. Then Jack meets Tracy. He falls for her, as she does for him. But Charlene is not ready to let go.