The Hidden Heir

The world had shifted, a wrongness seeping into the bones of those who had once pledged themselves to the Dark Lord. Inside a crumbling, abandoned manor, a child lay swaddled in black silk, her very existence a secret. She was nameless, known only to the madwoman who clutched her, breath coming in frantic gasps.
Bellatrix Lestrange knew the Aurors would come. They would find her, and worse, they would see those eyes—glowing emerald, just like his. They would kill her.
There was only one person she could turn to.
***
The knock came in the dead of night, sharp and insistent. Severus Snape opened his door to find Bellatrix, wild-eyed and desperate, thrusting a silent, swaddled infant into his arms.
"She's yours to keep now," Bellatrix rasped, her voice trembling. "You must keep her safe. She must remain a secret."
He looked down. The child's eyes, an impossible emerald green, stared straight through him.
His burden had just begun.