Alex takes Ana to his house. Her mother notices her daughter's attraction to her new classmate, and she gets closer to Tristan who has marital problems.
Ana and Alex get even closer. On a school trip she saves the life of Bianca, Tristán's wife, Tristán, grateful to her becomes more attentive to her than to his wife, a fact that goes unnoticed by Alex.
Tristan, disappointed with Bianca, ignores Hoffman's advice on moving away from Ana. Alex visits Ana's house when she is out and is seduced by her mother. Ana is surprised and agrees to follow the rules of the game.
Alex shows Ana the video that made her and Tristán having sex the gym. He also sends the video to Tristán on his cell phone, which devastates him. Next they Alex calls Tristan to gym and made him have sex with Ana again and he tapes it.
Alex, realizing Ana's emotional involvement with the teacher, warns her not to confuse her feelings. Tristan has another sexual encounter with Ana under coercion, which is deliberately filmed by Alex. Now it's Ana's turn to extort him.
Ana pays for school with Tristan's money. A family encounter with her parents makes her rethink their relationship. Alex and Ana question the new history teacher. Ana is suspicious and jealous. The school director surprises everyone.
Ana investigates Alex's history. She takes advantage of Bianca's absence and visits Tristan at his home. At night, she goes to school and is surprised by Alex who starts a new game of manipulation.