In a fanfiction about Harry Potter's fourth - year betrayal, it could center around Ron. Maybe Ron gets jealous of Harry's newfound fame during the Triwizard Tournament. He starts to act cold towards Harry, which Harry sees as a betrayal. This could lead to a rift in their friendship until they both face a common danger that makes them realize the importance of their bond again.
One possible betrayal in Harry Potter's fourth year could be when some students believed the false rumors about Harry being a cheater in the Triwizard Tournament. In fanfiction, this could be explored further. For example, Hermione might initially doubt Harry due to the overwhelming rumors, creating a sense of betrayal for Harry. However, as the story progresses, she realizes the truth and they reconcile.
A fanfiction could also explore a betrayal by a teacher. Perhaps Professor Moody (actually Barty Crouch Jr. in disguise) could be made to have a more elaborate plan of betrayal. He could have been secretly feeding false information to Harry all year long, making Harry believe he was being helped when in fact he was being set up for a much more sinister purpose. This would be an interesting take on the fourth - year events in the Harry Potter universe.
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