Fics like Regulus Black's Favourite Gryffindor

Regulus became an Animagus because he wouldn't let Sirius and his friends become the youngest wizards to have ever accomplished that. Being a cute, black cat he gets into every common room - scratching everyone who tries to touch him, except for a certain James Potter. He also so happens to be able to A) annoy his brother who is allergic to cats and B) overhear interesting conversations. (+ little bonus of Peter and the girls gossiping)

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