Cruel Intentions 2 (2000)

Seduce and destroy.

After his precocious behavior has gotten him bounced out of one more in a string of exclusive private schools, 16-year old Sebastian Valmont has arrived in New York City to live with his father and stepmother. The cunning and handsome Sebastian may have met his match, however, in his equally manipulative and beautiful stepsister Kathryn Merteuil.