Blood Stained Starlight

As Harry fled the wrath of his enraged relatives, desperate to escape their cruelty, he stumbled upon a haggard yet imposing figure - Sirius Black, the notorious escapee from Azkaban. Little did Harry know that this encounter would ignite a spark that would forever change the course of his life.
Sirius, hardened by his unjust imprisonment, had shed the shackles of moral constraints that once bound him. His time in Azkaban had eroded his adherence to the light, leaving him a wizard unbound by societal norms. Recognizing the kindred spirit in the mistreated boy, Sirius took Harry, his godson, under his wing instead of hunting for Peter Pettigrew, offering him a chance at a life far removed from the oppressive clutches of the Dursleys.
For seven years, the wizarding world remained oblivious to their whereabouts, unaware of the profound transformation unfolding within the shadows. When Harry resurfaced, now a man of twenty, he had shed his former identity, emerging as Haris Sirius Black - a powerful, confident, healthy, and utterly ruthless dark wizard.