Behind the Green Door by thewickednix

Genre: Angst
Rating: NC-17
Word count: 17 000 (+ the sequel of 42 000)
Tags: Dark!fic, war time

Summary:

In the midst of the Second Wizarding War, Draco Malfoy witnesses his father's capture of Harry Potter. Draco is given a mission: to watch the Boy Who Lived. But in the dungeons of Malfoy Manor, something besides hate and enmity is born between two desperate souls.

Quotes:

One would think I would be relieved that the prisoner I'm watching is behaving so well. But in truth, it just makes my life that much harder. When Potter isn't yelling and screaming at me, throwing punches and picking on me every second, I have no idea what to do with myself. And what bothers me most is to have to admit to myself that Potter's behaviour actually makes a difference to me.

"Malfoy, what is with you? It's your turn." Potter lifts an eyebrow humorously. "I thought I would be the one going nutters in this dungeon, but it seems you beat me to it."

Touché.