Summary: Someone shockingly realizes that Harry and Snape are Father and Son, and wants to know know more. Harry and Snape don't have to know yet, but they can. You decide who the other character is, but Harry and Snape should also have a main appearance.
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Summary: Somehow, Harry and Snape switch positions. Harry is the teacher, and Snape is the student. Only they know about the switch. Nobody else remembers, and doesn't think anything is wrong. How do they fix it?
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Summary: A teacher (or other member of staff) at Hogwarts is hiding a Dark side. He or she has ambitions to take Voldemort's place as Dark Lord/Lady.

Has to be a canon teacher, but NOT Dumbledore, Snape, McGonagall, or an already evil character like Quirrell.

Harry is involved in their plan somehow (whether or not he knows it). Snape is either involved too, or discovers the plan.

Bonus for:
- a really unlikely candidate
- Harry and Snape being the only ones who can stop him/her
- it bringing them together
- them having to prioritise between stopping Voldemort and stopping the rival by deciding who is the greater threat
- they make the wrong decision
- another prophecy (or more) confusing the issue.
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Summary: Snape somehow becomes the sudden guardian of a trio of Gryffindors, including Harry. It can be the 'Golden Trio' or any other group of Gryffindors, as long as Harry in included.
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Summary: Something happens (spell, potion, something else) to make everyone who loves, or likes, or tolerates, or even just knows Harry suddenly want to kill him. And they're not holding back.

Whether Severus is affected or not is up to writer.
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