Adam is not talking to his mother again since she caught him watching porn, which was bad enough, but what made it worse was that she continued to watch it with him and analyzed why it wasn't realistic from a female's point of view. Cathy realizes what she did with Adam was wrong, but she still wants to make sure that at age fourteen he is not yet having sex, and that when he does that he can both talk to her about anything in that vein and that he treat the girl properly. As she deals with this issue, she is beginning to see physical beauty around her, which includes blue iris flowers, her own body and how best to show it off, and the sexy new muralist at the school named Lenny. Meanwhile, Paul has sustained a rugby injury which has him sidelined, but not in the eyes of "rugby tart", Tina. And the building in which Sean is living is scheduled for demolition. The only way he figures he can save his makeshift home is to play the game by acting like one of the masses who has conformed to society. He gets an unexpected hand in looking the part.

During the course of their continuing sexual relationship where they do it anywhere they can on unofficial breaks during the school day, Lenny notices a lump on Cathy's lower back side. Dr. Todd's diagnosis is that the cancer is showing itself, but that it does not necessarily mean that the cancer is getting worse. As it is purely a cosmetic issue, Cathy can choose to leave the lump or have it removed. She chooses the latter, and asks the only person who knows, Marlene, to pick her up after the surgery. The lump makes Marlene try to convince Cathy to tell her family about the cancer. It makes Cathy reevaluate her sexual relationship with Lenny and think about bringing her family back together, which includes not only Paul but also Sean. She figures that entering the family into a charity bathtub race, a race they used to always participate in and enjoy, but which Cathy stopped doing because of all the work involved on her end, is a good start. Some news from Paul, and Andrea finding out about Cathy and Lenny could bring Cathy's current plans crashing down around her.

It's Cathy's 43rd birthday. Coming to the realization that this birthday may be her last, she, on an impulse, takes Lenny up on his offer to accompany him to the Bahamas for the weekend. That plan is placed in jeopardy when Paul throws Cathy a surprise birthday party at the house. For her gift, Paul gives her Rebecca, her best friend from college who she hasn't seen in fifteen years after Rebecca, who was supposed to be Cathy's maid of honor, skipped the wedding in favor of hanging out with a man she just met. Time has not changed Rebecca's perspective on life. Another surprise or not so surprise attendee at the party is Lenny, who stops by the house to pick up Cathy to head to the airport. Lenny meeting Paul, the party itself, and Cathy reminiscing with Rebecca about their good old college days make both Cathy and Lenny reevaluate if their affair is such a good idea. Meanwhile, Sean does some catching up of his own with Rebecca. And Adam notices that something is not quite right with Marlene.

Paul discovers his wife's affair and demands a divorce.