Cain and Gina were one of my favorite (and least favorite in some ways) thing about BSG. Filling in the details of their relationship was interesting to me in terms of fanfic. In terms of vidding, it would be difficult to vid that relationship because so little of it is on screen. Vidding them as their two characters without focusing on the relationship feels like a better idea, but I did love making that "heaven or hell" bit.