Sniper/Pyro (preferably female Pyro but I don't mind either way) because it's one of the only pairings I haven't seen before. The teams get transferred to a new location, forcing Sniper to spend the first few battles running around looking for a good sniping spot. A sniper sneaking around a battlefield is pretty suspicious, so Pyro always ends up chasing him down to spycheck. This keeps happening over and over again, and Pyro eventually accepts that he isn't a spy but continues to follow him around (even during ceasefire) because she enjoys spending time with him, not to mention she gets to barbecue all the spies that target him. Bonus points if Sniper is suitably confused/oblivious as to why Pyro keeps following him around (without trying to set him on fire that is) and someone has to spell it out for him. Posted here rather than the gen thread because sexy times would be much appreciated.