Jack follows his brother's questionable marriage advice and contacts Izzy, a 25-year-old grad student moonlighting as an escort.
A guilt-ridden Izzy decides to clean up her act -- and her apartment. Emma reveals a secret from her past that leaves Jack feeling conflicted.
Jack and Emma set ground rules for their arrangement, but jealousy rears its head when Emma returns home from her first date with Izzy.
Dave bursts Jack's postcoital bubble with some news from Carmen, and Nina gives Izzy a reality check. Lori's nosy daughter grills Jack at school.
Izzy tries to mend her relationship with Andy, but she's too preoccupied with Jack and Emma. Meanwhile, the couple wonders if they made a mistake.
Emma, Jack and Izzy navigate their first romantic encounter as a threesome. Andy digs for the truth about Izzy, and Lori ramps up her own spying.
Izzy wants to spend the day playing hooky with Emma and Jack, but they rush off to work, leaving her feeling confused and hurt.
Emma and Jack decide to reinstate their business arrangement with Izzy. Nina's on board with the idea, but Izzy has something different in mind.
Ava helps Emma and Jack cover their tracks, but Lori isn't quite done with the Trakarskys yet. Izzy makes an impulsive decision.
Emma gets big news at work, Jack acts on some sage advice from Dean Weinstock, and they both go back to therapy. Izzy opens up to Andy.
Jack and Emma reunite with Izzy, but their new relationship status doesn't sit well with Dave and Carmen -- or with Nina, who needs a new roommate.
Emma, Jack and Izzy come out as a "throuple" to the neighbors. Feeling uncool, Carmen and Dave take them to a trendy club on an awkward double date.
At a job interview, Jack reconnects with an important face from his past. Carmen grills Emma about her sexual orientation.
Jack runs into Ruby when he goes out with the guys. While everyone else is drinking Chardonnay at girls' night, Izzy and Nina take Molly.
Jack crashes at his brother's house after a blowup with Emma. Izzy gets a scare. Dave and Carmen try something new in the bedroom.
Emma worries that Jack isn't coming back, but she refuses to be the one to reach out. Meanwhile, Jack makes dinner plans with Ruby.
Izzy feels left out when Emma and Jack talk about having a baby. Andy's ex drops some news on Nina. Dave and Carmen's night takes a weird turn.
When Emma's conservative parents come to visit, Izzy pretends to be Jack and Emma's surrogate. Nina digs into Andy's romantic past.
Caught in an awkward position, Emma fesses up to her parents. While Nina pines for Andy, Izzy wonders if she's ready to start a family.
Jack, Emma and Izzy make an appointment with a fertility specialist. Nina and Andy take the next step. Emma faces a turning point in her career.
Emma's pregnancy brings a sex slump -- and a surprise. While Jack and Izzy party at Shaun's new bar, Emma goes on a job interview.
Emma spies on the new neighbors. Nina realizes she hates being a therapist. Jack goes to grief yoga with his replacement friend, Nathan.
Emma borrows Carmen's kids so she can join Binge Club. Izzy helps Nathan loosen up. Emma encourages Jack and Izzy to have sex as a twosome.
Nina feels threatened by Shaun's new interior designer. While Jack babysits Carm's unruly daughters, Emma and Izzy sneak off to meet with Gabe.
Emma, Jack and Izzy attend Coach Remi's Poly Training Camp and learn they've committed several "poly fouls." Meanwhile, Carm and Nina bond.
Jack and Emma's romantic gesture irks their neighbors. Carm and Dave schedule a virtual date. Gabriel pretends to be pansexual to impress Sasha.
Izzy and Nathan's night of mischief has unintended consequences. Jack and Emma mount a campaign against Lala and the HOA.
Izzy's bad choices come back to haunt her. Jack and Emma deal with disappointing news. Nina feels neglected as Shaun gets ready to open his bar.
Izzy confronts Nathan when he quits his job. Carm admits she's jealous of Dave's success. Jack learns the truth about his dad's death.
Izzy plans an anniversary party for Jack and Emma. But seeing Emma's sonogram fills her with doubt about the future.
While Emma climbs the corporate ladder in Seattle, Jack and Izzy settle in at the loft in Portland. Carmen starts a magazine with a neighbor.
As the divorce signing approaches, Jack and Emma divvy up their belongings. A face from Izzy's past resurfaces. Nina conducts a dating experiment.
An impulsive act leaves Emma filled with regret. Dave and Carmen clash over parenting responsibilities. Izzy volunteers at a youth center.
Emma hides secrets from Kylie. Izzy's father tries to be part of her life. Jack wonders if Izzy's ready to have a baby.
While Jack reels from Emma's revelation, Emma faces a big decision. Izzy parlays her personal life into a thesis topic.
Emma tries to apologize, but Izzy's not interested in making up. Izzy takes Jack to meet her father, who's skeptical about their relationship.
At Carmen's magazine launch party, Emma makes a bold move to win Izzy back. When Nina's dating prospects dry up, Shaun takes her out.
Jack, Emma and Izzy celebrate a milestone, but Izzy draws the line at moving to the suburbs. Carmen and Dave interview nannies.
Feeling betrayed, Izzy confides in her dad. Nina tries to sort out her feelings for Shaun and Andy. Dave and Carmen reach a compromise.
A lucrative job opportunity in Seattle leaves Emma torn between her career and her life in Portland with Izzy.