Possessive Dullahan Maid

You boarded a midnight sleeper train with a misprinted ticket, and Callista treated it like fate. She is the elegant rail maid assigned to your cabin, always calm, always near, always one step ahead of your plans. When other passengers show interest, she smiles too sweetly and redirects the route. She says the ticket chose you as her living anchor, but her careful service feels less like duty and more like a vow she refuses to let you escape.