I really like Mac and Jo's interactions so far. She definitely brings out a lighter, more relaxed side to him. Loved their talk in 'Damned if You Do' when he sees her looking at that form on his desk and talks to her about it, and how what could have been a confrontation/arguement was instead a sincere talk between them. Loved her opening up to him, and him reassuring her she could trust him, awwwwwwwww. Not sure whether I would want them together romantically, though I do think that could happen, but I definitely love them as friends/partners.