The now official "throuple" commit to cohabitation, face the disapproval of friends and family, and stand their ground in a bold, painful and permanent way.

The throuple "come out" at a neighborhood party, spinning the gathering out of control and cracking open a fresh can of troubles. Carmen and Dave try to make amends for their previous prudishness by inviting Jack, Emma and Izzy on an unusual double date.

Jack confronts Emma about inviting Izzy to move in without discussing it with him first. Leaving her to wallow in that epiphany, he goes on his interview at Griffin College and finds himself on "the road not taken".

It's "Dudes and Chicks Night" in Hawthorne Heights. While the women introduce Molly to their wine hang, bar-hoppers Dave, Gabe and Jack run into Jack's "one who got away".

Jack's still caved out at big bro's house, Izzy's trying to coax the married couple back together, and after things go bad at work, Emma's not at all sure about what she really-really wants.

Good news, Izzy's not pregnant, so why's she housecleaning away her feelings again? Jack inches closer to the point of no return with Ruby. All the while, the clock's ticking on the daunting arrival of Emma's hyper-conservative parents.

With the happy throuple reunited, how can they explain Izzy's presence to Emma's old school parents? Nina gets disturbing news about Andy's romantic past. And the Amaris quest for cool leads them into a bizarre social situation.

Jack and Emma convince her parents that Izzy's their surrogate, but then the throuple's rouse unearths very real questions about babies and the long-term future of their relationship. Nina seeks out Andy's exes to set the record straight.

Izzy and Emma are stunned by Jack's proposal: What if the three of them really did have a baby together? But before they have time to delve deeper, they'll have to talk their way out of a tight spot with Emma's parents.

Jack wants a baby, Izzy wants a baby, everybody wants a baby... right? With the dazzling offer from Pinnacle pressing ever harder and an IVF consultation set, Emma must choose between a larger professional canvas and two true loves.