Kristina Corinthos-Davis revealed to her sister, Sam McCall that she offered to sleep with her professor in exchange for a better grade.
When Parker shows up at the Davis house, before Kristina is about to go back to college, it is revealed that Parker is a woman and she has a wife who is a doctor. Parker and Kristina exchange a few words before she pushes her way inside. She introduces herself to Alexis, but when she does not recognize the name "Parker", Parker realizes Kristina did not tell her parents about her suspension and the reason behind it. After Alexis leaves Kristina and Parker argue and they both "threaten" each other (Kristina telling Parker's wife and Parker telling Kristina's parents). Kristina accuses Parker of wanting her, which Parker denies. Parker threatens Kristina with expulsion, claiming that she thought Kristina posted bad teaching reviews online. Parker also tells her to use her time away from school wisely and to figure out what she wants before her parents do. Then she leaves.
Months later, Parker shows up at Kristina's door and they talk. Later on, Kristina kisses Parker. Parker also speaks with Alexis. In July, Parker returns when she has to give a speech at a university. Kristina visits Parker, and reveals she has moved on and is now dating a boy named Aaron Roland. Kristina learns Parker and her wife broke up, and comforts her, leads to them kissing and then having sex. After talking to Alexis, Parker breaks things off with Kristina via a letter. Parker is seen again on Wesleyan University's campus.
Months later, Parker starts teaching at PCU. Kristina's sister, Molly, has signed up for her class, and is surprised to see who is teaching. Kristina is with her mom, Alexis Davis, at a concert in the park, when they happen to run into Parker. Alexis is not at all happy, and lets Parker have it. After Alexis leaves the park, Kristina decides to join Parker on her blanket and drink some wine with her. Parker tells Kristina that while she tried to patch things up with her wife, they are no longer together.
Weeks later, Kristina drops out of PCU in order to date Parker and the two start dating. Sadly, the Dean sees Kristina and Parker kissing before her drop out papers go through and fires Parker. Parker decides to move to Oregon and Kristina makes the decision to go with her.
As of August 2018, Parker and Kristina are no longer together.