It's corny, but: Benny as a tribute from an outer district (doesn't have to be 12, but can be) and Dean as one of the Careers whose dad died in the game, who volunteered for Sam the way Katniss did for Prim. They aren't pushed together by the Capital like Peeta and Katniss, though- they find each other and protect each other, and when they team up with Castiel (probably another Career) Cas finds a way to hint at them without the cameras seeing that they'd get more sponsors if they played it up.