Y/N has been Tessa Yeager's best friend for years. Long enough to become part of the family. Long enough for Cade Yeager to think of her as a constant presence on the ranch. Then Optimus Prime shows up, government agents destroy what's left of normal life, and suddenly they're all running for their lives together. Somewhere between the explosions, the grief, and a cramped truck cab crossing the desert, Y/N accidentally falls asleep against Cade. Neither of them is prepared for what happens next.