Y/n is the 23 year old daughter of Tony and Pepper, and Bucky’s girlfriend. Her and Bucky have a thing together. On missions, they whistle to each other to signal that they’re okay. Both Y/n and Bucky got blipped because of Thanos. 5 years later, they come back. Y/n sacrifices herself. But then at her funeral, Bucky hears a whistle. Their whistle. Y/n’s soul is still alive, but only he can see her.