A/N: Another Dark Slash Fic - contains elements of dubcon and violent relationships. It's set in the same time and place as my other two fics (First Time and Potions) and works on the premise that Sirius and Remus are already in a (somewhat twisted) relationship. It has a second part as well if anyone's interested...

Power

Knowledge is power. Snape knew that, and in a fight that was usually four against one, he needed all the knowledge he could get. He noticed things as well; little things like the way Remus stepped smartly backwards when a dementor appeared, the way he never touched the silver cutlary, the scars that mysteriously appeared across his face.

And of course the big things too, like Remus's absence from class every month which, if you were interested in astronomy, you noticed always seemed to happen at full moon. The pieces slotted neatly into place and to Snape they formed the shape of a weapon.

It was knowledge. And knowledge was power. The trick about power, of course, was how to use it.

He was only ever close to Remus in potions, so it was then that he made his move. He waited until Sirius and James were looking away, waited until Remus was bending over the cauldron, stirring slowely and counting under his breath. And then he leant down, close to Remus's ear and whispered "I know what you are Lupin."

Remus tensed right up at that, and almost dropped the spoon. Snape smiled, the twisted smile of someone holding all the cards and continued, "How much do you value that secret?"

"I-I don't know what you mean."

"You know exactly what I mean Remus. I know why you dissapear each month, why you're afraid of the silverware, I know what you turn into, once a month. I know what's inside you."

Remus gave a gulp, his eyes flickering over to where James and Sirius were laughing at something.

"Don't you dare tell them." Snape hissed, loosing his cool and controlled mood slightly. To his relief Remus nodded quickly.

"Alright." Snape thought quickly. Sirius was already starting to shoot suspicious looks in their direction, this was clearly no place to continue the conversation for any length of time. "Meet me in the history classroom. Tonight. We'll talk about it then."

It was cold. Remus shivered as he carefully tiptoed down the hallway, wondering what the hell Snape was going to say. The classroom was deserted; it was a well known fact that Binns slept in his office and, being dead, slept very soundly indeed. There was still the offchance, however, that some other teacher would be wandering around.

Snape was waiting inside. "Lupin?"

"Yes." Remus carefully creaked the door shut behind him, wincing as the hinges complained.

They stood for a moment, the soft moonlight playing down the walls. Half-moon. Snape glanced at it. "So, you're a werewolf."

Remus had a brief, wild thought of denying it before realising that that would be both pointless and impossible. "Uh, yes."

Snape gave a smirk. "And what are you willing to do to keep that secret safe?"

Remus clenched his teeth in the back of his throat, knowng that he had absolutly no choice in the matter. He gave a shrug, wondering what the hell Snape had in mind.

"Anything?"

"What do you want Snape?"

Snape frowned, uncertain himself. What he wanted was to hurt Sirius Black, and Potter if possible. How Remus's secret was going to do that he wasn't quite sure.

Remus took a step forwards and the moonlight shone on the side of his neck, illuminating a thumb-mark bruise that Snape was sure he'd seen before. He recognised it too, he knew how you got marks like that and sudenly I wild idea, a crazy idea, flew into his head.

"Come here."

Remus obediently stepped forwards.

"Get, get on your knees."

Remus looked up at him, gaping slightly. "What?"

"You heard." Snape tried to keep the uncertain tremor out of his voice.

Remus dropped to the floor, his head bowed. Still not completely sure why he was even thinking of going down this route, Snape fumbled with his belt, trying to distinguish the pattern of hooks and eyes in the darkness and cursing as his finger nicked on the sharp edge of the buckle.

Remus's cool slender fingers reached up and took the belt from him, unhooking it with ease. Then Remus was undoing the buttons, opening his mouth and oh sweet mother of fuck-

Snape reeled back against the desk, grabbing Remus's hair in his fingers. He'd never felt this feeling before, never in his life had oh god! The feeling enveloped him, surrounding him, and as he shoved Remus forwards, as Remus started to squirm and choak beneath him, he realised just why people made so much of a fuss about the whole buisness.

The desk was the only thing keeping him upright, one hand was twisting and pulling in remus's hair, pulling his head backwards, stretching his mouth wider, wider, while the other hand stretched over remus's neck, landing in the same bruises Sirius had made. Remus gasped for air as Snape pushed harder and harder until Remus broke, crying and gasping and oh god it feels so fucking good.

He came then, all over Remus's mouth, feeling half suprised when the boy made a game attempt at swallowing, choaking on his tears. He wanted to keep Remus down, down on his knees, but he hadn't the strength to stop him getting up and backing away slightly as Snape pulled his trousers back on.

"Was, was that what you wanted?" Remus said, half-unsure, still sniffling slightly.

Snape nodded unable to speak.

Remus left, exiting quickly, and almost running back up the stairs. He tried to think about Sirius, about telling Sirius, about loving Sirius.

He tried not to think of the hardness bulging inside his own trousers. He tried not to think of how sweet it would be to have Snape on top, Snape in control and Snape taking him, over and over while the wolf inside howled.

And when Sirius took him the next night, roughly flipping him into the sheets, he bit his lip till it bled, trying not to say Snape's name.

A/N: Please leave a review - if there's enough interest I'll stick up part II...