Sirius hated Snape.

He had many reasons to hate him. The git was always snooping around, always trying to get them in trouble. He tried to stop James from getting close to Lily. Sirius hated that he was now trying get between him and Remus.

There is no you and Remus, his head reminded him.

A flash of Remus and the other boy, kissing, punctuated the fact painfully.

Most of all he hated how the stinking snake had made Remus look.

The animagus had been sneaking back from the library after curfew, the Invisibility Cloak wrapped around himself and three big leathery books "borrowed" from the Restricted Section. Snape and Remus were apparently making prefect rounds, and Sirius had almost collided with them as he turned a corner.

Or, more specifically, they apparently should have been making their rounds. Instead, the two boys were pressed together, Remus with his back against the wall. Snape was kissing him, and for a split second the animagus was going to attack him, but then he saw it - the werewolf's pale fingers were tangled in the other boy's black hair, and they were pulling the greasy git closer, not pushing him away.

Sirius had stayed next to them, frozen in shock. Fortunately, the kiss broke soon, and the werewolf had smiled at the other boy before stepping away.

"We should get going", Remus had said. "See you next week."

"See you, Lupin."

They had walked off in different directions, and it had taken the long-haired animagus half an hour to raise the courage to go back to the Dorm.

It had been that smile on his friend's face that really got under Sirius' skin. It had been such an affectionate and happy expression that his heart had ached because it was that jerk that had made HIS Remus smile like that and it should be only HIM who could.

It was six days since that kiss. Only three since the full moon. Remus was still in the Hospital Wing, and Sirius was waiting in their Dorm, sitting on the window sill. He had a book about werewolves in his hands, and was currently reading about their mating rituals. He hadn't gone to see the friend, though it was probable he wouldn't have been allowed to, even if he'd showed up. He was sure his friend would come to him as soon as he was released, though. Remus would want to know why he did it.

As if by magic, the door creaked open and then clicked shut, and soft footsteps walked to him. He didn't raise his head, partially because he was waiting for a fist to connect with it at any second. Instead, a heavily bandaged hand sneaked over his shoulder and a long finger tapped the page he was reading.

"That's not true", a slightly hoarse voice spoke. "We don't mate for life."

Sirius turned towards his friend. Remus had fading bruises on his face and his left arm was in a sling, but otherwise he seemed to be intact. He didn't look angry, or even hurt. He mostly looked tired. Without another word, the honey-haired boy limped towards his bed and started digging in his trunk for a clean pair of pajamas.

It made Sirius' blood boil.

With a couple of long strides the black-haired boy was behind the werewolf, who must've heard him, but didn't react. The animagus shook with pent up emotion.

"Don't you want to know why I did it?" he growled through clenched teeth.

"Not really, no", Remus said infuriatingly calmly. "Nothing can make it right, so there's no point. But I forgive you, Sirius, whatever the reason."

"Why?" the other boy asked, suddenly feeling confused and vulnerable.

Maybe Remus couldn't stay mad at him because he felt the sa- ?

"We live in the same Dorm. It would be inconvienient if I held a grudge against you. Of course, if you sent Severus down the tunnel because you were mad at me, and continue to be mad at me, it gets complicated."

Defeat could be heard behind the soft-spoken words. Sirius had struck a cord. Remus was feeling something because of his actions. It both elated and pained the long-haired boy, and he was unsure what to do. When the slighter boy dropped his trousers, exposing his long, pale legs and more gauze, he grabbed him by the arm.

"Did you fuck him?" he hissed into a delicate ear.

"That arm is broken. You're hurting me", the werewolf said, still somewhat composed.

"I asked, did you fuck him?" Sirius growled and squeezed harder, smiling venomously as the other boy whined and crawled onto the bed to avoid dropping to the floor as his knees gave out.

"I don't know what you're – ah! I didn't, I didn't! Please stop!", Remus gasped in pain as the animagus twisted his hand.

"Good", the black-haired boy murmured and shoved the trembling boy face first onto the bed.

Remus was so clumsy with his broken bones and bandages, that the taller boy had plenty of time to yank his tie from around his neck and then force the werewolf's slim wrists behind his back, tying them. The position must've been painful, because he saw tears staining the side of his face that wasn't pushed against the mattress.

"I always wanted to be your first", Sirius muttered softly as he crawled on the bed and pulled the other boy's pants down his thighs, exposing his scarred arse.

"N-no, Sirius, Padfoot, please don't", the pale boy begged, shaking violently.

"Why not? Am I somehow worse than Snape?" he spat, but kept his touch gentle as he kneaded the tight flesh.

"I would've never slept with him", Remus sobbed and tried to crawl away, but strong hands stopped him. "I lied, I lied..."

"Lied about what, Moony?"

"We do mate for life, if we care about the person we do, Sirius please, you'll kill me, you'll claim me and then you'll leave and I won't be able to live without you!"

The honey-haired werewolf was truly crying now, and Sirius knew it shouldn't have made him feel like it did, but he couldn't help but feel powerful and excited when he had another being in front of him, so helpless and scared. Somewhere behind the sadism he felt a warmth, a misplaced sense of love, as he muttered a spell that prepped his friend's passage for him. He opened his trousers and yanked them and his pants low enough to expose his leaking erection.

"I'll never leave you", he whispered as he leaned over the other's quaking body, positioning himself. "and I'll make sure you won't leave me either."

With a slow but deliberate push, he entered Remus, who grew utterly still. His sobs subsided, and he was quiet for a long while. When the animagus had worked his way in, he pulled back and started fucking his friend with gentle strokes. Magic rippled in the air, sliding against his skin, and he heard a small moan escape the werewolf.

He smiled and loosened the tie, slipping it from around the thin wrists. The honey-haired boy didn't struggle, instead, he balanced himself on his elbow, cradling the broken arm against his chest, and pushed back to meet Sirius' next thrust, ever-so-slightly.

The dark-haired boy felt the smaller body clench around him. That was all it took for the animagus to shudder and release his seed into his new lover. He pulled out and rolled over, then gathered Remus against the sweaty front of his school shirt, claiming his mouth as he had just claimed the rest of his body and soul.

"How do you feel?" he whispered as held the trembling body close, other hand petting the honey-brown hair.

"Angry", the werewolf spoke softly against his neck. "Hurt. Betrayed."

"What are you going to do about it?" the animagus asked calmly.

"Nothing", Remus sighed and snuggled under his chin.

"I love you", Sirius muttered against the top of his head.

"I'm yours", the werewolf said sleepily.

The answer wasn't exactly what the black-haired boy had hoped for, but he smiled none the less. He pulled back enough to be able to kiss the boy's clammy forehead before reaching to pull the covers over them. He waved his wand and the curtains slid shut. In the shadows, he saw Remus' golden eyes blink before falling shut.

"Mine. Mine forever", the taller boy hummed affectionately and hugged him tighter.