For years, Y/n has kept everyone at arm’s length, convinced no Alpha could ever see them as more than their designation. Then Steve Rogers and Bucky Barnes prove them wrong. Their relationship is built on trust, not instinct—until a mission separates them just as Y/n’s next heat begins. With enemy forces closing in and suppressants wearing off, Steve and Bucky race against time to reach Y/n before someone else does. Because this time, it isn’t just the mission at stake. It’s the person they love.