This has been sitting in my inbox for a really long time, I apologize for not responding sooner! I was going to try and go through all the Finnick/Johanna fills for the ficathon, but I didn’t… so I’m just going to answer now.
in a way i ship johanna and finnick because god, he’s always been there for her, and they’ve been through a lot together, and she needs someone to love her because at least he has annie and he loves her back, she has no one left to love and no one left to love her.
Maybe Johanna was acting alone, knowing Finnick would side with her once her intentions were clear. Although it’s hard to guess what goes on between those two. I think of how he looked to her for confirmation before he’d agree to help set Beetee’s trap.There’s a much deeper alliance based on years of friendship and who knows what else.