Fics like A Study in Obsidian

Summoned across time by a botched blood ritual, a battle-hardened, morally grey Harry Potter finds himself stranded in 1975, long before the First Wizarding War truly ignites. Stripped of his past but armed with a lifetime of lethal combat experience and the dark magic he cultivated to survive, Harry refuses to be a pawn for Albus Dumbledore or the rising Dark Lord. Instead, he decides to seize the board. Infiltrating the very heart of the pureblood elite, Harry sets his sights on the Noble and Most Ancient House of Black. But as the lines between manipulation and genuine, consuming passion begin to blur, Harry realizes that breaking the timeline might be the easy part. Controlling the three most dangerous witches of their generation, while the wizarding world spirals toward war, will require absolute dominance. Marauder-era AU featuring a Metamorphmagus, Slytherin Harry, and a complex polyamorous dynamic with the Black sisters. Rated M to be on the safe side - Contains adult themes

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