Pheromones
Post Civil War, things have worked out better, now that the world understands that the Avengers can be depended on, even if a tad (or a lot) unstable. Blame Tony for that. In the A/B/O universe, (my own take on it) an OFC is hired by Stark Industries for a low-tier job, but gets pulled in tight, mostly with Bucky, courtesy of their inability to sleep without nightmares and flashbacks. Angst, Comfort, mutual pining, and science technobabble follow with the other Avengers, who are quiet taken with the intense and intelligent omega. But remnants of Hydra, and otherworldly forces, see her too. AU-Tony is still snarky, Clint is awesome, Natasha is still a badass. And Phil Coulson is alive. I need him to be alive!
The Sequel has begun!