With the annual Greek Ball on the horizon, Casey and Cappie recall a fateful development from their freshman year, and Casey is also reminded of a selfless act by Frannie that had a major impact on her life.

Casey’s grand-big sister, Kiki , is back at Cyprus-Rhodes University for her wedding and all the ZBZ girls are invited. Amidst all the wedding frenzy, Max decides it’s time to take his relationship with Casey to the next level and gets down on one knee. Meanwhile, with Andy out of town, Jordan ends up dragging Rusty around town to help pick up the flowers for Kiki’s wedding. When the two discover that the order was never placed, they have to come up with a plan of action however, the plan backfires and puts both of them in the emergency room with identical allergic reactions. The unexpected common bond leads them to share a kiss. Rebecca, in the meantime, soon finds herself in new territory as she kisses Ashleigh’s openly gay big sis, Robin, in one of the bachelorette party game sparking Rebecca’s curiosity.

Rusty attempts to solve a mystery involving a secret service he ran across on campus in hopes of impressing Cappie. Meanwhile, some of Frannie's defectors from ZBZ house have asked to return, and Rebecca seeks dating advice from Calvin as she readies to go out with Robin.