In the world of superheroes and villains not only was that a power issue in itself but so was having a second gender. A/B/O was another issue itself, not only was superhuman abilities a rarity but depending on your gender it made you even more superhuman. Alphas were the strongest of the strong and omegas....not so much. Mostly seen as incubators they have always been created as lesser, more delicate. And if like you, were an omega that happened to work for shield and the avengers, everyone saw you as slightly lesser. The avengers knew you weren't useless but not quite enough on the same level so they often were protective of you after you had become friends. One in particular.

Bucky has always seemed to be more interested in you since you helped Steve and Sam get him back to his true self, not the winter soldier. You two bonded over time, like two peas in a pod despite him being an alpha. So when you were sent to quarantine for your heat he immediately became more agitated.

It was one of those days where everyone had been called off to a meeting on the latest issues and Bucky stayed behind to watch you just in case. Slowly you opened your sealed door for the first time in a couple of days covered in sweat and other fluids feeling mushy. Desperately you needed to move about or else you'd go crazy in your room alone. Unfortunately that meant letting out days of built up pheromones into the tower for Bucky to pick up. With careful movements you try to push yourself towards the kitchen hoping to get a bite of something to calm your stomach. Unbeknownst to you Bucky had immediately known you were out and was quickly on the move to your location with the smell of an omega in heat to fuel his fire