Soldier stumbles upon/saves Medic (who has a bone to pick with the Reich, perhaps they stole his medigun research? killed his family? his gay lover?) during his rampaging tour through Europe and they end up becoming a team and exterminate Nazis together. They start out hating each others guts and just dealing with each other out of necessity and common goals. It's up to the writer if it evolves to friendship, bromance, romance, or nothing has changed and they still hate each others guts. (I'd prefer the first three as there's not enough friendly Soldier/Medics around here.) In the end they either go their separate ways or stick together until their employment with RED/BLU. There are two major scenes I'd love to see written out: One, where Soldier gets bashed in the head and Medic, who has been trying to cobble together a working medigun for some time, finally gets it to work and saves his life. However, it leaves Soldier with permanent/long lasting PCS (post concussion syndrome) and this is the Soldier that we see today. The other involves Medic dying and having Soldier either use the medigun on him or kidnapping a doctor to save him. Either way, it helps cements their friendship or at least how much they're accustomed to each other.