Fics like Most Faithful Servant

Warned by his future self of his impending death, Harry joins Voldemort in his fourth year at Hogwarts. As the months pass, he wrestles with his choice. Barty is jealous of Harry Potter. Barty feels something for the Dark Lord. That doesn't matter though. He's busy helping his lord conquer Wizarding Britain. And if he had to mentor Harry Potter? Well, the kid was like a fungus - he grew on you.

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