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For the past year, Y/N and James “Bucky” Barnes have shared the world’s best-kept secret. By day, they’re nothing more than teammates—trading sarcastic remarks during training, bickering over music in the Quinjet, and maintaining the perfect illusion that they’re simply close friends. By night, once the Avengers Compound falls asleep, Y/N quietly slips into Bucky’s quarters, where the feared Winter Soldier becomes nothing more than the hopelessly devoted man who sleeps better with her in his arms. No one knows. Not Steve. Not Sam. Not even Natasha. They’ve perfected keeping their relationship hidden. But when an ancient cosmic force awakens and begins searching for the mysterious celestial energy Y/N has carried since birth, secrets become harder to keep. As dangerous enemies close in and long-buried truths about her extraordinary abilities begin to surface, the Avengers are pulled into a battle that could change everything. Saving the world is difficult. Pretending the Winter Soldier isn’t secretly the biggest marshmallow alive? That might be the real impossible mission.