@SpicySprint Speaking as a writer myself, I can offer a few ideas.
First off, I know the season ended with everyone graduating from Clone High...but imagine a story where either Cleo or Frida tries to ask the other to Prom. However, they struggle constantly with trying to find the right way to do so.
Second idea, marriage proposal
Third, either Cleo or Frida invites the other to their house for dinner
Fourth, a story giving a more in-depth look on how Cleo's feelings for Frida first started