Which dropped plotline do you think should make a return?

Basically the title.

Personally for me it's Charlie and Dee being in love but can't be with each other due to the Gang.

They've slept together twice - once with consent and one where Charlie didn't.

Dee gave Charlie a Valentine and made Charlie sing for her

They're actively spoken together about they only insult each due to the Gang's pressure

Charlie has flirted and complimented Dee, while the rest of the gang have only ever insulted her (unless for manipulation)

What about you guys? Which dropped plotline do you think should make a return?