Secrets and Masks by Emerald_Slytherin

9 years after the battle of Hogwarts, the war still rages on and everyone is much changed since their days at Hogwarts.
Hermione is the most lethal soldier in The Order, spending her days on rescue missions to free captured Muggleborn slaves and fight on the front line. For years, she's been meeting in secret with a spy within Voldemort's ranks to exchange information.

But when she's captured and made prisoner at Malfoy Manor, of all the dark and evil ways she'd envisioned Malfoy would torture her, she never quite imagined anything this horrific.

Secrets and Masks by Emerald_Slytherin eTextbook