The Difference Between Darkness and Black

[Summary] Set during the third book. Basically, I take Snape and poke him with a stick until he begs for mercy. Lucius manipulates him, Percy has an accident with some strong aphrodisiac, and Severus wrestles with his own feelings for Sirius Black, who keeps showing up in his bedroom.
[Pairing] Snape/Lucius, Snape/Black, a little bit of Snape/Percy
[Warning] NC-17 Lemon Imperius Curse non-consensual, sadism, spoilers
[Added] 22 May 2004