Fics like if he only knew

Sirius uses polyjuice potion to pull a prank on James by looking like him. But James has been keeping a secret from him. He’s been secretly sleeping with Regulus, but Sirius finds out about that…when Regulus pulls him into an empty classroom, thinking he is James. Sirius tries to leave, he really does, but Regulus‘ lips are way softer than he expected…

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