So they got reunited in a federal prison called the Litchfield Penitentiary operated by the Federal Department of Corrections, which is the fictionalized version of the Federal Bureau of Prisons.
As they examine their relationship and deal with the other women inmates Piper and Alex began to discover themselves that is why the show often unveils flashbacks of significant events from the past of the two main protagonists as well as the other inmates.
Most of the episodes of the series focus on how one inmate came to be in prison so detailed back stories are essential to establish good plotlines.
In Season 3, it looks like Piper has transformed to become a ruthless criminal herself and thus her transitioning relationship with Alex. Whereas in the beginning, Alex seems to be the pain in the neck of Piper, the positions have been reversed and fans now root more for Alex than Piper because of the latter’s evil transformation.
It may be Piper’s way of finally getting even with Alex for dragging her to prison and it seems like Taylor Schilling is doing a wonderful job in transforming her character from a kale-eating yuppie to a stone-cold, scheming heart-breaker.
She also cheated on Alex during Season 3 and she even had the gall to flaunt to her former girlfriend her new relationship with Stella.