An alternate universe in which, while Steve and the rest of the Avengers are out doing their thing, Bucky makes his way to the tower. Maria is currently in charge, seeing as how Fury is elsewhere and, after Ultron, the team wants a human to babysit the place with Jarvis. She doesn’t turn him in, just keeps an eye on him. He spends most of his time in the tower, so that’s not too hard. Somewhere along the way, respect turns into trust. The sparring sessions turn into dance lessons, with Jarvis playing ‘40s tunes. The carriers falling from the sky turn into soldiers falling in love.
And Peeves, whom Harry had never seen take an order from a student before, swept his belled hat from his head and sprang to a salute as Fred and George wheeled about to tumultuous applause from the students below and sped out of the open front doors into the glorious sunset.