Hey everyone here's Chapter 13. I hope you enjoy it! Yay! Thank you so much for reading and reviewing. It always gives me inspiration! Thank you again. Please Review. I would love to hear from you.

Disclaimer: I do not own Harry Potter that would go to J.K. Rowling.

"Mine," Severus whispered against Sirius' lips. "I'll officially make you mine." Sirius' mind went blank.

"What are you saying?" He asked tongue feeling ten times bigger in his mouth.

"You'll be mine if we make this official right? You won't belong to anyone, but me right?"

Sirius nodded. "Yeah, of course."

"Then I want you to be my boyfriend," Severus said then pushed Sirius against the bookshelf again causing him to hit his head against the hard wood, but that didn't matter too much to him since Severus was kissing again with much more fervor than the one before. All coherent thought went out the window along with everything else in the world. It was just the two of them. That's all that mattered.

Severus moved from his mouth down to his neck making a path of butterfly kisses that sent Sirius reeling with pleasure. He clamped a hand over his mouth trying to stifle the moans that wanted to escape. He was trying his hardest to be quiet in the library. They didn't need the librarian or anyone else to show up and ruin everything.

Sirius glanced down at Severus with eyes glazed over with lust. He would take Severus right there and then if he could; he had to clear his mind to make sure he had everything straight. I need to stop him from sucking on my neck, it feels too good though. I can focus on what I need to. Sirius shook his head to clear it from his cloudy haze of euphoria. "You really want to make us official?" His voice came out huskier and rougher than he wanted it to, but when large lust filled eyes landed on him it didn't seem to matter anymore.

"If it means you're mine and Potter can't touch you the way I do." To demonstrate his point Severus attacked his neck again and let his hand slide up underneath his shirt. A cool hand roamed freely under his shirt sending gooseflesh to cover his skin and sparks to run through his body. Severus freed his neck and opted to watch Sirius' reaction to what he was doing with his hand under his shirt. Sirius' cheeks flushed having Severus watch him so intently. It was like he was trying to memorize each reaction and store the information away from future use which was probably what he was doing. His abdomen muscle jumped when Severus' fingers danced tantalizingly over his flesh. They drew random patterns over his lean stomach making him wonder why they haven't explored each others bodies more. He was eager to find out what Severus' sensitive spots were because he certainly found some of his.

Sirius' eyes rolled in the back of his head and his breath caught in his throat when Severus' hand went lower and his hand stopped above his pants. He pulled his hand away with a satisfied smirk. Sirius licked his lips and tried to right his mind, it was going places it should not be going and it involved a very big bed and the whole weekend to themselves.

"It would mean that." Sirius paused for a breath. Severus was really adamant about Sirius becoming his. His insides filled with butterflies as his mind slowly processed the information. If he was Severus' that would make Severus his. "You would be mine then?" Sirius asked finally catching his breath after Severus' little exploration of his stomach.

Severus gazed at Sirius. The black eyes that first started everything captured him again and made him their prisoner. "Of course."

Severus went back to exploring Sirius neck, he moved from his neck near his shoulder, and Severus bit down on Sirius shoulder. Sirius yelped in surprise, Severus pulled back to look at his handy work. "You bit me!"

"Yeah, I'm making sure people can see that you're mine," Severus smirked even more at Sirius.

Sirius reached up a hand and felt blood. He pulled back his hand and found his blood staring back at him. "What are you a vampire?"

Severus licked his lips then lapped up the blood on Sirius hand, much to his surprise and pleasure. Severus' tongue swirled around his finger removing all the blood. "You never know," Severus said moving from his hand back to the wound he created. Sending Sirius in to hyper sensitive mode. Every time Severus' tongue touched his love bit his knees went weak, he held onto Severus for support, and ecstasy ran through his veins. Someone licking a wound shouldn't feel that good, should it? Sirius thought as Severus finished up his work.

"All done." He took a step back and admired his work. "Now everyone who see's that," he pointed to the love bite. "Will know you're taken. Remember you're mine," Severus growled against Sirius lips one last time before he kissed him then turned back to get his book bag. "Now we're going to the lake to work on our Defense Against the Dark Arts paper."

Sirius was barely getting over his euphoria when Severus' comment hit his eardrums. "What? We're really going to work on homework?" He ran to catch up with a fast walking Severus.

"Yes and I suggest you go get your books and scrolls to work on it. Meet me by the tree we were at last time. Even though we're together now we should keep a low profile for now."

"I agree, but homework seriously? I thought we were doing fine just now."

"Yeah, I'm sure you think so, but work first pleasure second." Severus looked out of the corner his eyes and lifted his eyebrow.

"Oh, sounds good to me. I'll see you soon." Sirius bounced on the balls of his feet then took off at a sprint. Today was turning out to be a good day. He passed a hollering librarian who went red then blue when she saw Sirius running again. Good thing she couldn't catch him once again. Who knew doing homework could be so exciting?

When he reached his dorm Sirius started to feel the throb of pain on his shoulder where Severus left his mark. He ran into the bathroom to check his hair and his new decoration. He pulled down his shirt and saw an alarmingly large red mark.

"Geez did he have to leave a huge one?" Sirius asked under his breath. He couldn't believe Severus would leave such a mark, but when Severus wants something he really goes for it.

He was about to adjust his shirt when James opened the door to the bathroom. "Hey Sirius I was wondering…," his sentence was cut off when he caught sight of Sirius' shoulder. Sirius covered up his shoulder with his shirt.

"What did you want James?" Sirius asked casually leaning against the sink with his arms crossed over his chest.

"Sirius what was that on your shoulder?" James asked eyes narrowing behind glasses.

Sirius moved a hand over the painful love mark. "Nothing. It was nothing. Don't worry about it, but I have to get going now. Homework to do, people to see. You know the drill." Sirius attempted to escape the bathroom, James block off his only exit with his entire body.

"Not until you tell about what's on your shoulder!" James said staring down Sirius. Now he was really in for it. How could he talk his way out of this one?