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Severus is a like an overprotective girl dad to Harry and I will die on this hill.
Harry: Dad, this is my girlfriend!
Awkward silence ensues.
Snape, looking the girl up and down: What are your intentions with my son?
Girl: Isn't this supposed to be reversed—
Snape: My house, my rules.
Harry: Seriously! She's fine—
Snape: I wasn't taking opinions, now, what are your intentions—
Cut to a very brutal interrogation scene.