Stepbrother plays dirty

Lea is 16 years old. She's is a quite and independent person that doesn't break any rules. However her 17 year old stepbrother Carter is totally opposite. He's a bad boy, cocky, arrogant and a full on player. When is comes to girls he treats them like disposable tissues. What happens when Carter gets the power to make Lea do anything he tells her. What will happen to Lea?