In the devils hands

Bellatrix Black (Dom) x fem.
Narcissa Black (Dom) x fem.

Draco Malfoy was engaged to Aurelia before he ever became capable of love.
He tried, at first. Polite words, practiced smiles, a hand offered like a duty instead of a choice. But he was still a boy trapped in a man's expectations and affection slipped through his fingers like smoke. So he kept his distance, watching her as if she were something breakable... or something already lost.
Others did not keep their distance.
Narcissa saw in the girl a fragile, luminous thing she refused to let the world ruin. Bellatrix saw something else entirely, a beautiful danger, a flame she wanted to touch simply to feel it burn. Their interest curdled into obsession, and obsession into rivalry.
The Manor grew quieter. Colder. Sharper.
Between two Black sisters, love was never gentle, it was territory.
And Draco, still hesitating, never realized that while he struggled to care for his fiancée, two women had already decided they would ruin the world before they lost her.