McGonagall has a pet cat that looks EXACTLY like he animagus form and let it wander around Hogwarts to put all her coworkers on edge.
It's only after it pisses in Snape's office, jumps up on Flitwicks lap and starts kneading, and thoroughly licks its butt in front of Sprout that they begin to suspect. Dumbledore, of course, knew the whole time, and played along, having one-sided conversations with it, letting it sit in on meetings that McGonagall didn't particularly feel like attending, and occasion Charming objects like quills and parchment to make it seem like the cat was grading.
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Harry Potter Headcannons
FantasyJust a bunch of Headcannons that I've collected. Most are from Reddit but some are from other stories on here. And maybe some Harry Potter crack here and there.