Fics like A Godfather's Vow

Voldemort's return and Dumbledore's reluctance to ensure Harry is ready for the fight ahead leads to Sirius taking matters into his own hands. He can't train Harry himself, not when he's still on the run from a Ministry determined to hunt him down. So he turns to the only person he can trust. His cousin's daughter, the talented and vivacious Nymphadora Tonks. Meanwhile, two Slytherins, determined to be free of Voldemort and keep their families safe, hatch their own plans...

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