Hi Everyone I'm back! Another Sirius/OC fic, but this one is a Marauder's era. I hope you like itI own nothing but the plot and Celia, but I would love to own Sirius.

Behind the Old Door

It really wasn't Celia's fault; nothing is as tempting as a locked door. Her curiosity along with Lily and Marlene's got the better of her, not for the first time. They thought someone was in trouble, how were they to know what was really going on? She would blame this all on Lily as she was the one that insisted Celia and Marlene patrol with her that night.

Lily was not too fond of thunderstorms, and of course on the night she was to patrol the halls there was a flash of lightning and loud crash every few seconds. Celia and Marlene agreed to go with Lily and nothing eventful happened for the first half hour; a few kids out of bed and peeves flying about, but there was nothing unusual about that.

Lily decided to check the 6th floor before going back to bed. No one was ever up there as it was technically off limits but they all were curious to see it and this was the first chance they had. So the three girls trudged up the stairs. They arrived on the landing panting from the steps and didn't see anyone in the hall. They poked around in some of the open rooms but there was nothing very interesting, mostly spider webs and empty space.

Marlene yawned "Okay Lily there isn't anything here can we go to bed now?" Lily was about to agree when a large clap of thunder rolled through, but it seemed to mask a woman's scream.

"What the hell was that?" Celia asked nervously pushing her friends behind her to try and protect them. Lily pushed herself out from behind Celia

"It sounded like it came from down the hall." She said and walked in the direction of the sound.

Celia knew it was definitely a girl's scream or maybe a young boy. As the three of them went further down the dark hall the screams got louder and more frequent. The corridor was dark except for the flashes of lightening which projected eerie shadows onto the stone walls. Celia thought this would be the perfect place for a crime. The location was straight out of a horror movie.

"I think someone's in trouble" Lily said "You don't think its Death Eaters do you?"

Celia sincerely hoped not, she had read the Prophet that morning and there had been more reports of people gone missing and Muggles being killed. The Death Eaters and all those crazy pure blood supremacists were no joke, and Celia was not exactly excited for the opportunity to face them.

" How would Death Eater's get into the school?" Marlene asked Celia and Lily as if they were crazy.

"Oh, good point." Celia said feeling relived and slightly stupid.

They came to the source of the noise; there was screaming and a commotion going on behind a thick wooden door. No one should have been in there. They could hear furniture being thrown about and groaning and screaming.

"Get your wands out" Marlene instructed and pulled her own from her robes. Lily's face was pale as Celia looked at her and quietly tried to open the door.

"It's locked" Celia told them and raised her wand to perform the Alohomora.

"Wait" Lily said, a frightened look on her face "Maybe we should get a teacher." Lily did have a point what if it was something they couldn't handle?

Just then the girl inside the room screamed "Oh my God!"

Lily gave Celia the go ahead, there would be no time to get backup, and so she shouted the unlocking spell at the door. The old metal lock busted off the frame with the force of the spell and Celia kicked the door open. It was not the sight they had expected to find, though it was just as traumatizing.

Amongst the cobwebs and ancient broken furniture was Sirius Black, The best-looking, most rebellious and most dangerous of the four marauders. He was completely naked and in a very compromising position with an equally as naked Michelle Timmons who was bent over the top of a dusty old teacher's desk.

Time stopped and all five people stared at each other, mouths open in shock at the sight before them. No one moved for a good 15 seconds and then chaos.

"Oh my god!" Lily yelled as her face turned a bright shade of red. Marlene screamed and covered her eyes, while Michelle pushed herself away from Sirius and dove behind the desk.

"Get out" Michelle yelled frantically at Celia, Lily and Marlene as she tried to feel around the floor for her clothes.

Celia couldn't move, she continued to stand frozen with her mouth flopped open; she always froze when shocked or in fear. She could not believe this had happened.

Sirius stood there staring back at her, with a sheepish yet cocky grin. He did have the decency to grab a dead potted plant to cover up his bits with though.

"Hey guys" he said running his free hand through his dark messy hair. At that moment Celia's slight crush on him became a lot more.

Lily got a hold of herself and began to yell at the naked couple. "Put some damn clothes on and get back to your dorms! You are lucky I'm not taking house points for this!" she continued her rant but Celia tuned her out as she was admiring the naked, glistening body of Sirius Black.

He was fit, with rippling abs and that v at his pelvis that made her heart palpitate. He had a light dusting of black hair on his chest and starting again below his navel then disappearing behind the wilted hydrangea he covered himself with. She had to remind herself that she had a boyfriend, and it wasn't right to have naughty musings about his enemy.

Celia had been dating Fabian Prewett for the last 2 years but she never could figure out why Sirius and Fabian hated each other so much. They were fine until the beginning of 4th year, and Gideon, Fabian's twin had never really feuded with Sirius. It made no sense. She assumed it was because before Sirius had come into his own, Fabian was the heartthrob of Hogwarts.

Men and their territory issues.

So of all the blokes that she shouldn't be fantasizing about, Sirius Black was at the top of that list. By that time Lily had stopped shouting, and grabbed both Marlene and Celia by the arms and dragged them out of the room slamming the door behind her.

"Can you believe we just walked in on that?" Marlene asked flabbergasted as they walked back to Gryffindor tower. "Michelle Timmons! I thought she was so innocent."

Michelle was a quiet 5th year Ravenclaw; she was very pretty but no one had ever seen her date.

"Obviously you were wrong." Celia laughed.

Celia thought that maybe Michelle got around a lot, but she was just very discreet about it.

"I've never seen anyone having sex before." Lily stated seeming rather traumatized "Is it usually like that?" she asked turning to Celia the only non-virgin of the group.

"I don't know! If you're asking if I have ever been thrown over a desk and banged from behind the answer is no" she told Lily.

Though now that she really thought about it she didn't think she would mind it so much. Michelle seemed to be content enough, hell the girl screamed so much that Celia had burst through a door to try to rescue her. Fabian was not exactly a god of the bedroom it was basically quick and to the point, then they cuddled.

"I'm sure it's not uncommon though, to each his own."

"I wonder if Lupin is like that?" Marlene wondered out loud in a far away voice.

Lily and Celia looked at each other then burst into giggles. They had suspected Marlene had a crush on Remus but she had never confirmed anything before.

"Ha, I knew you liked him." Celia taunted.

"I like him, but I don't know if he likes me." She said slightly forlorn.

"Of course he likes you, how could he not." Lily reassured her.

"Ugh, I don't know but shut up about it for now, I don't want anyone to know" Marlene said as they reached the portrait of the Fat Lady and the subject was dropped.

As the girls walked into their common room, Potter, Remus and Peter were sitting on the sofa in front of the fire playing a game of exploding snap. When James spotted Lily his hand immediately flew up to his hair and Lily scowled at him. Celia knew it drove lily nuts when he did that, and ever since the incident with Severus last year, Lily acted like she hated Potter even more than normal. Still Celia suspected that she actually had a small thing for Potter, but her pride would never let her act on it.

"Hey Evans" Potter said to her beaming. The boy had it bad. Lily kept a straight face and ignored him as she walked up the stairs. Celia smiled and shrugged at Potter and swore he looked honestly hurt by Lily's snub. So Celia had to work on both Lily/James and Remus/Marlene. Thank Merlin it was a Hogsmeade weekend.

Thanks for reading Please review? Oh and "The best-looking, most rebellious and most dangerous of the four marauders" is literally how JK describes Sirius, and then she kills him. Thank god for fan fics where we can resurrect him:)