Bree struggles with peer pressure as her friends Olive and Sara lead her into trouble. Ash, the school heartthrob, meets Bree at a bus stop after receiving a mysterious phone call from his old fling Mellisa, while T, a quiet pizza boy, becomes smitten by Olive when he delivers her a pizza.

Ash takes Bree's virginity and she becomes awakened to her burgeoning sexuality, while Ash feels something he's never felt before. T discovers that his crush, Olive, is in a relationship with the racist school bully, Jeremy, while Sara is revealed to have secret feelings for Olive as well. In the final scene, Ash goes to visit Mellisa where she turns his life upside down.

Ash's friend, Gabriel, shuns him after he finds out about the STI rumours. T finds Olive crying in the stairwell at school and offers her a shoulder to cry on. Ash apologizes to Bree for potentially infecting her, and she reluctantly agrees to let him go to the sex clinic with her. Later, T smokes weed for the first time with Olive, and they make love in her garage.

Jeremy and his gang beat up T in the back parking lot of the school, threatening to kill him if he touches Olive again. T, battered and bruised, goes home to his Mother, who reveals that he has received a scholarship for University. Bree and Ash go to see Doctor Chang, where it is confirmed that Bree also has Chlamydia. Bree takes the news badly. Jeremy then confronts Olive, slapping her, and leaving her on the side of the road. After T ignores her call, Olive finds solace in Sara's arms.

When confronted with the chance to get back at Jeremy, T decides to take the high road. Bree finally tells Olive and Sara that she had sex, and also reveals to them that she has Chlamydia. The three girls bond over mutual honesty. Ash convinces Bree to keep their relationship hidden; however, after he ignores her at school, she agrees to be his ex-friend Gabriel's partner for a class project.

Gabriel makes a move on Bree during their study session. T and Olive get back together, and Jeremy sees them kissing in the hallway. He then confronts Olive, who rejects him. Bree warns Jeremy about touching Olive again, sending Jeremy into a violent, nostalgic rampage. Later, T comes home to find his Mother crying, and she reveals that Ricky was attacked and is now in the hospital. Bree debates telling Ash about her and Gabriel's study session.

Bree's secrets pile up as she finds out that she has been cured of her Chlamydia, leading her to question her feelings for Ash, who finds out there are 'complications' with his infection. Jeremy seeks out revenge against T, while Sara tries to tell Olive how she really feels. Ricky's drug dealers lend T a visit, looking for the weed Ricky stole, ultimately leading to a violent, emotional confrontation that changes all of their lives forever.