Kinda Scout x Sniper if you squint and tilt your head sideways, but not really.
Based on the heart-wrenching comic by nintendonut1 on Tumblr.
It hadn't even been a day since the robots showed up that they realized they weren't making it out of this one alive. Eighteen people could only last so long against an endless army of mechanical nightmares, and that realization sunk in just as the ship the robots had arrived on was blown to smithereens by the combined efforts of RED and BLU.
For being mortal enemies since day one at Restoration Excavation Demolition and Builders League United, they made quite the team. They celebrated the destruction of the aircraft, just pretending for a moment that they weren't Soldiers argued of course, but it was in their nature to yell, and everyone else seemed willing to put past grudges behind them. The only two classes that could not even for a moment forget about their imminent death were the Scouts and Snipers.
BLU Scout had his ma and five brothers back in Boston, and his RED counterpart needed to at least say goodbye to his older sister. The two Snipers had close relationships (however strained they were sometimes) with their parents. They all needed to talk to their loved ones just one last time, so during the drunken festivities, in an unspoken agreement, they left the building together and rushed to the only two phones on the premises.
Before the machines had come to kill them, the telephone area was considered 'neutral', not that anyone ever had much use for it. Each phone was team-specific; how that worked was beyond them, but with technology like the respawn machine they had learned to just accept things as they were and leave it at that. As it was, only one person from each team could use the phone at any given time, so they played a quick game of "Rock, Paper, Scissors" to decide who would get to go first. BLU Scout and RED Sniper won.
While they made their calls, there were only a few feet between them, but the conversations were so similar privacy would have hardly matter. The goodbyes and "I love you"s were kept short, both knowing how much it was killing their teammates to have to wait to say what would probably be their final farewells. As they hung up, eyes swimming with tears, they glanced at one another. The following embrace wasn't awkward, though it should have been. Scout imagined he was hugging his ma goodbye, and Sniper was just hoping his mum would be alright if he never came back. "Some men get a chance to give their mums a last goodbye embrace…but I guess you'll do," whispered the Aussie. The Boston boy let out a pained chuckle, squeezing the older man tightly. "Right back at ya, chucklenuts."
I apologize for any feels that may have occurred. Blame nintendonut1 for making that comic.