Disclaimer: I own nothing

Warning: Sexual content in this chapter

….

James would be lying if he said that his discussion with parents didn't make him doubt his newest friend. He had always known Luna was strange. She did and said strange things, she knew things she shouldn't, and she was quite a little fireball. However he never in his wildest dreams thought she was outright lying to them about anything.

Did she know that she was directly related to him? Had she perhaps done research on his family or spied on him to find out things? Maybe she discovered she was adopted, investigated things further, and decided she wanted to meet James and his family?

Or…as much as he despised this other possibility, he had to be logical about this. What if Luna was a spy for Voldemort? What if, instead of being a Potter, she actually knew enough Dark Magic that she could break through the enchantments surrounding his house?

The worst part of this whole thing was that he couldn't discuss this with Sirius. Sirius was so enthralled with the bird that James knew he would jump immediately to her defense.

Instead he took it upon himself to keep a closer eye on her, similar to Sirius's original stance with her. If she was possibly his cousin, there must be some similarities between them, right? He scrutinized her closely over breakfast the following morning. But damn it the only thing that reminded him of himself was her black hair. Lots of people had black hair. Plus, he'd gotten his black hair from his mum's side of the family, not from the Potter side.

"Hey, mate," Sirius clapped James on the shoulder. "Would you mind if I took Luna for a spin on my motorcycle? I don't want to leave you here all by your lonesome…" Sirius hated making James feel left out of anything.

"It's fine," James told him sincerely. "Have a good time."

James wished that Sirius would leave the house by himself and come back. He still suspected that perhaps since his parents had unofficially adopted his best friend that perhaps the house considered him a member of the family. Yes, that must be it. The enchantments around the house recognize Sirius as a Potter since he lives there and is treated like James's brother.

James watched in amusement as Luna and Sirius argued about her wearing a helmet. "I said no, Black!" She snapped. "If you're not wearing one then I'm not wearing one, either!"

"Fine! I hope we get hit by a bus and your head gets cracked wide open, wench!" Sirius snarled back.

Luna crossed her arms over her chest and stuck her nose up at the proffered helmet. Sirius made an "Arrrggg!" sound before giving in just as James knew he would. "Alright! You win. I'll wear a fucking helmet."

"Language, Sirius," scolded Dorea as she came into the room.

"I apologize for using foul language in front of you, Luna," Sirius said with a roll of his eyes.

Luna smirked at him, wondering deviously what Dorea would say if she knew that Luna could probably out-cuss Sirius. "I accept your apology. Make sure it doesn't happen again," she batted her long eyelashes at him before turning and flouncing out the door.

James watched from the window as they crossed the yard to the garage. They emerged a few minutes later on his motorcycle, both with helmets he noted with a chuckle, then they drove off down the long driveway and out of the gates. Of course, leaving Potter Manor wasn't the issue, just entering.

…..

"This is amazing!" Luna screamed over the roar of the wind in her ears as they flew above the cloud cover so they wouldn't be seen by the muggles below. Sirius wasn't worried about the muggles spotting them but Luna was.

"I know!" he shouted back. He pressed harder on the throttle and the bike shot forward even faster. Luna gave a squeal of surprise and clung even tighter to him as she had her arms wrapped securely around his middle.

It was a short flight overall but Luna was glad about that. "Oh Merlin, I am so fucking cold!" she yelled as they dipped through a cloud.

Sirius chuckled but wouldn't admit that he himself was freezing his perfectly sculpted arse off.

When they landed right outside of the large gates leading to James's home, Sirius felt her body shiver around his and wished it was due to something other than the cold temperature.

The very moment they passed through the entrance it was several degrees warmer. "I think my fingers are going to fall off," she said breathlessly. Sirius was grinning happily as he pulled the bike into the garage.

He put down the kickstand, swung his leg over, and got off the bike. Luna, however, sat where she was, waiting for warmth to spread through her body. "I think that is the absolute sexiest thing I have ever seen in my entire life."

Luna glanced up at him in question to see him staring at her with his jaw dropped open. Then she looked down at herself. Her legs were numb from the cold air, but she had insisted on wearing a skirt just for this reason. She wanted Sirius to have this view.

She leaned back just a bit and her already short black skirt moved even higher up her legs, showing off the creamy skin of her thighs all the way up almost to her knickers. She took the helmet off and shook out her long black hair.

"Going to keep fucking me with your eyes, Black?" she teased as she swung her leg up higher than was necessary to make sure he got a clear view of her red lace-clad center while she got off the bike.

"I would love to fuck you with more than just my eyes, but we agreed to make that moment special, didn't we?" His voice was a low rumble in her ear as he pulled her to him and buried his face into the crook of her neck as he kissed her there.

"Hmm," she hummed happily in response, curling her body around his.

"Of all the places and times you could have ended up," he whispered, "It's like you were sent here by some divine plan just for me."

"If there's one thing I'm sure of, it's that I was meant to have this time with you. I was meant to love you," she told him unashamedly.

Sirius twisted his fingers into her hair and pulled her head back so he could press their lips together. Luna groaned when his tongue slid between her lips, and his hands moved down to grip her bum firmly, pulling her even tighter against him.

"Am I interrupting something?" James asked casually as he entered the garage.

"No, mate, what's up?" Sirius's voice was still low and full of lust, which James must have noticed because he crinkled his nose, feeling a bit awkward to hear his friend use such a tone.

"Yes," Luna corrected, "you are interrupting something. Sirius was just about to push my knickers aside and take me right here," she took a step back to pat the seat of the motorcycle.

Sirius growled to show his appreciation for her statement. "Well Mum saw you two come back and wanted me to come and get you. Apparently she needs all of our opinions on decorations for the party."

"Party?" asked Luna.

"Every year we have a New Year's Eve party here," James explained, "it keeps Mum's family from getting too fed-up with our blood traitor ways if we host a party for the most elite wizarding families," he said this in a fake-uppity accent and with an elegant flourish of his hand.

"Do I need a party dress? I didn't bring one. Maybe I should go shopping…" she mentally calculated how much money she still had from the gold Dumbledore had given to her at the start of term. She still needed to get Christmas presents for her friends, too.

Sirius's eyes lit up at the idea. "Excellent idea, doll! I'll take you!"

Luna knew what was behind his enthusiasm; the idea of her modeling less-than-modest dresses for him to inspect. "I think I'd rather go with another girl, thanks," she patted his cheek affectionately.

James began to form a plan. If he could get Luna to leave the manor and come back without Sirius then he could know for sure which of the two of them was getting past their wards.

"Here's an idea, Luna. Why don't you go pick up Lily on Christmas Day for me? I bet she'd want a new dress, too. I'll even give both of you the gold for the dresses. You can go pick her up from her house and take her shopping."

"But I thought you wanted to meet her family?" asked Luna.

"I do, but I can meet them when I drop her off at home after New Year's."

Filled with excitement, Luna clapped her hands together and asked with a broad smile, "Are you sure? You're okay with that?"

"Absolutely." Luna squealed and hugged James at his words of assurance.

James decided right then that he would put off worrying about the Luna problem until he knew for sure if she was the one who the wards were letting through. He still fervently hoped that it was Sirius as Sirius was an honorary Potter.

….

The week passed by quickly and before they knew it, it was Christmas Eve. The Potters had a tradition of giving Sirius and James each one gift the day before Christmas. The five of them; Charlus, Dorea, Sirius, James, and Luna, sat in a quaint sitting room where a small Christmas tree was set up.

There was a much larger Christmas tree in the ballroom where they would hold the New Year's party, but tonight was about family. There was a fire roaring away in the large grate and Luna found herself yet again overwhelmed with emotion.

Dorea flicked her wand and three presents appeared; one in front of each of the teenagers. "Oh, Dorea," said Luna, oddly touched by the gesture. "You didn't have to get anything for me. I honestly wasn't expecting anything. Letting me stay here with your family during the holiday is a gift in itself."

"Oh, it's nothing, dear," said Mrs. Potter fondly. Over the past week she'd grown quite fond of the girl. She was still of the opinion that her husband's brother had an illegitimate child and that Luna was their niece.

Luna proved to be helpful, polite, and charming. Not to mention the way she managed James and Sirius. Dorea still laughed to herself when she thought of the day before when Luna had scolded both boys for not helping Dorea set up the ballroom for the party. She'd somehow gotten both boys to give their mother a heartfelt apology and they made it up to her by going to get the enormous Christmas tree.

"Wow, Mum!" James cried as he pulled his gift out of the box to get a better look at it. Luna glanced over to see James holding a broom polishing kit.

She smiled at him and moved to open her own gift. She peeled the lid back and gasped in surprise. Nestled into the silk lining of a small jewelry box was a thin golden chain. The charm on the chain was a delicate golden heart with the Potter family crest, complete with the Potter family motto. "Confortare Cor," she read aloud.

"Courageous heart," James translated for her unnecessarily. Luna popped the locket open. There were places for two pictures. It was larger than most necklaces she wore, but it was the most perfect and beautiful gift she'd ever been given.

"Thank you," she said quietly, feeling like words wouldn't be enough to express her gratitude. "May I ask why you would give me such a sentimental gift?"

"I have two of them," said Charlus gruffly. "That one belonged to my sister, Charlotte. The other one belonged to my mother. The one that belonged to my mother we're going to give to Lily tomorrow."

"Mum, Dad," said James, "Those are really important family heirlooms, what if…" he trailed off knowing they would understand. What if things didn't work out between Sirius and Luna? What if things didn't work out between him and Lily? Neither couple had been together very long.

But Charlus and Dorea Potter knew better. They'd seen Sirius interact with the girl all week. They knew that the two of them wouldn't leave each other. Then there was James who had talked about Lily Evans since his very first day at Hogwarts. That was yet another couple they were sure of.

"Give us some credit, James," Dorea chuckled. "They are charmed. I'm sorry, dear," she told Luna, "but if you and Sirius split up, and you're not a direct Potter descendant, the necklace will return to us here."

"That's quite alright," Luna said with assurance. Even if Sirius left her, she was a Potter. This necklace belonged to her. It was almost more than she could handle emotionally right then. "Sirius?"

Sirius hadn't said anything since they opened their gifts. "This is…" he was staring at the small box in his hand. "Are you sure?"

"Of course we're sure," said Dorea as she brushed his long dark hair back over his forehead. "James was just saying the other day that you're an honorary Potter, so why not?"

Sirius gently pulled the ring out of the box and held it out for Luna to inspect. Like her, Sirius received a Potter family heirloom as a Christmas gift. It was a ring identical to the one on James's finger. It, too, had the Potter family crest and motto.

With absolutely no warning, Sirius launched himself off of the floor and hugged Dorea tightly. When he released her, he hugged Charlus just as enthusiastically. "Thank you both so much."

"Alright, everyone, I think it's time we get to bed. Tomorrow is going to be a big day! Luna has to go pick up Lily, then they're going dress shopping, and it's Christmas so that means Tilly and Tippy will make quite the feast, then…"

"Okay, Mum," James cut her off as he bent down to kiss her cheek. "We get it. We'll go to bed. Love you, see you in the morning!" and he trotted off up the stairs.

"Goodnight, Dorea, Charlus," Luna hugged both of them and hoped she conveyed her emotions to them in her hugs. She and Sirius and climbed the stairs hand-in-hand.

"That was very nice of them," she said as she stroked her locket lovingly.

"Yes it was. They must know how much I love you to do something so special for you," he told her as he pulled her to him and brushed a soft kiss on her forehead. They were at his bedroom door now and Luna had grown very accustomed to the room over the past week.

His bed was on a raised dais in the center of the room. It was a large four-poster bed, but the drapes around it were a sheer white so you could see through them even when they were closed.

In the corner by the window he had a broomstick and there were several personal items strewn about on a dresser. There was a fireplace in every bedroom of the house and the house elves kept this one burning all the time.

Sirius kept the window open all the time, too. He liked the breeze while he slept and with the Potter's clever enchantments on the house, the air was never cold. Every night they were there Luna wondered if it was the night. She knew Sirius was planning it because what bloke wouldn't be? He wanted her, she wanted him, and it was only a matter of time.

As he smirked down at her, she reached out and twisted the handle of his bedroom door, then pushed it open. To say the sight that met her eyes surprised her would be an understatement.

The normally roaring fire was dimmed down to just a light crackle. There was soft music playing on the wireless in the corner of the room and it made Luna smile to picture Sirius setting all of this up for her. The bed was neatly made and there were flowers strewn all around it, but they weren't roses as was usual for romantic settings. No, these were lilies. Like her name.

Oddly touched by the gesture she moved forward into the room and when she did candles she hadn't previously noticed lit up all around magically.

"I have decided that tonight is the night," his words sent delicious chills up her spine and desire coursed through her stronger than she had ever felt it before. She wanted this man more than she had ever thought was humanly possible.

"Candles?" she quirked an eyebrow at him.

"I'm nothing if not thorough," he said.

She giggled and took a few steps back, moving toward the bed. He closed the bedroom door and made sure it was locked even though nobody would come into his bedroom anyway. Luna watched with lust filled eyes as he stalked toward her. Once he reached her, he spread his large hands out on either side of her waist and pulled her to him, kissing her hard.

"Luna," Sirius pulled back, looking down at her with blazing eyes, "Wait."

"What's wrong?" her voice was calm and patient, but inside she was freaking out. If he really wanted to wait, if he didn't want to have sex with her, she was going to go crazy. She wanted him so badly she was hardly containing herself at the moment.

"I need you to know that I love you."

Her heart stopped. Part of it broke. Tears came pouring out of her eyes and she somehow managed to reply, "I do know that, and I love you, too." He was kissing her then with such intense passion that the room spun around her and she would have fallen to the ground if his strong arms hadn't supported her.

He led her to the bed and laid her out on it very gently. He hovered over top of her, laying sweet kisses all over her face and neck, "I love you, Lily Luna Granger," he rasped.

Luna froze with her hands in his hair, her face tilted up towards his. She had a fierce desire to hear him call her by her real name, not the fake one. "Potter," she corrected softy.

This time it was Sirius who froze. Anger and pain flashed across his features before he masked his emotions and asked, "What does James have to do with this?"

That was when she realized her mistake. Sirius thought she'd just called out his best mate's name while she was in bed with him. "No," she said, "My surname isn't Granger. It's Potter."

Sirius leaned back, away from her, and asked, "How is that possible?"

"You know that there is something strange about me, and that's what it is. My real name is Lily Luna Potter. You know that I came here from the future, but that's not how I know so much about you and everyone else. I knew about the Map and the fact that you're all Animagi because I am Lily Luna Potter. My father is Harry James Potter, and your best friend, James, is my grandfather. I'm sorry that I'm telling you all of this now, but I couldn't let you make love to me without you knowing the truth.

"I already told you that Dumbledore is working on a device to send me back to my own time, and as soon as it's finished I'll be leaving and going home. Forever. Sirius, whatever it is we have, it won't last. You're needed here in your time, and I'm needed in mine. Sirius Orion Black, when I came here, I didn't expect to fall in love with you, but I did, and I don't regret it. I still very much want you to make love to me, but you had to know who I am."

Luna pulled herself up and kissed him lightly on his lips, but he didn't respond. He sat there just looking at her, entirely dumbstruck. Shaking slightly, she said in a whisper, "If you don't want to see me anymore, I'll understand. I wasn't supposed to tell anyone the truth, but I couldn't lead you on anymore. I love you, and I will always love you, even when I return to my own time, but I understand if you can't continue our relationship."

"Is that what you think?" Sirius asked in a rough voice. He surprised her by pulling her body against his, cradling her in his arms, and whispered in her ear, "I am so glad you finally told me the truth, love, and it doesn't change how I feel about you. You're…you're James's granddaughter?"

Luna nodded in confirmation, still biting her lip nervously, waiting for him to freak out and become repulsed by her. But this didn't happen; instead he kissed her just below her ear and said in another whisper, "I love you, Lily Luna Potter. I don't care what time you're from. I don't care who your parents and grandparents are. All that matters to me is that you're here now with me and that you're mine."

She turned her head towards him and they kissed passionately. "Sirius," she moaned against his lips, "make love to me." A growl escaped him and he pushed her back onto the bed, using his body to press her delicately into the mattress. "Sweet Merlin, I love you," she gasped.

He supported his weight on one of his elbows and moved his other hand to her shirt, which he unbuttoned and pushed off of her. Aside from that, she was wearing a white muggle skirt and a blue tank top. Sirius let out a moan of longing just looking at her. Her midnight black hair practically glowed in the candlelight.

She pushed his button-up shirt off of him, as it had already been hanging open, leaving him in muggle jeans and a plain black t-shirt. She ran her hands up and down his chest, over the thin cloth that was concealing the muscles that she knew lay just beneath her fingertips. Sirius tugged her tank top off of her, leaving her in a lacey white bra and her white skirt. He looked down at her breasts and pure need rushed through him like never before. He ran a hand down her face, over her collarbone, to her breast which he grasped and she moaned in response.

Experimentally, he dipped his hand into the cup of her bra, feeling her bare breast fill his large hand, and a small shriek escaped her. He lowered the lower half of his body, fitting it between her legs, and rubbed their hips together. Impatient to be claimed by him, she tore his shirt off so that she was able to feel his strong chest and abs.

She splayed her hands over his muscled body, and he groaned, reveling in the sensations she was causing. Luna tugged at his belt, undoing it, unbuttoning his trousers, pulling the zipper down, and he assisted her in pulling them off. He kicked them onto the floor, leaving him in a pair of boxers.

Her eyes widened at the sight of his arousal, and she had to check to make sure she wasn't drooling. The anticipation was making her throb. She just wanted him inside of her. She needed to feel him inside of her. Luna needed to know that he felt the same way about her that she felt about him. That there was no one else for either of them except each other.

Sirius ran his hands down her body, creating goose bumps as they went, until they reached the elastic band of her skirt. With a smug smirk he dragged the skirt and her knickers down her legs and tossed them aside. He bent his head down to kiss her on the lips while his hands went around to her back. Helping him, she lifted her upper body off of the bed as he unclipped her bra and tugged it off of her so that she finally lay before him entirely naked.

For just a moment, Luna found herself to be oddly self-conscious. She had always thought that she looked good naked, but it was Sirius' opinion that mattered to her more than anyone else's. The hungry look that appeared in his eyes as he took in the sight of her naked body assured her that she was more than satisfying to him.

Her voluptuous breasts heaved up and down as her breathing sped up, and Sirius had to taste them. He dipped his head down and she squealed in pleasure as he took one of her nipples into his mouth. She squirmed and writhed beneath him as he continued his ministrations, massaging her, kissing her, sucking on her, nibbling, biting, and driving her crazy.

He pulled back so that his eyes could make several more trips up and down her body, appreciating every inch of her in the semi-darkness that surrounded them. "Sirius, please," she begged. "You're driving me crazy just looking at me like that."

"You're the most gorgeous thing I've ever seen in my entire life," his lips crashed against hers with such urgency that she squeaked in surprise before meeting his passion with her own. She had never snogged anyone quite like this. They were both moaning and gasping and running their hands over each other's bodies desperately.

Until, finally, his lithe fingers stroked the place where she needed him to touch her. Her body jerked beneath his and she couldn't help the sounds that escaped her when his fingers entered her, thrusting into her with a gentleness that surprised her.

Impatiently, she reached down and tugged his boxers off, as they joined the rest of their clothes on the floor. For a moment they both paused, looking at each other, and Sirius hoped that she was doing what he was doing; committing that moment to memory. Her dark hair framing her beautiful face, her chocolate brown eyes drowning in lust and love, her cheeks flushed red from what he was doing to her body, her chest heaving as she waited for him to enter her.

Luna couldn't believe what she was seeing. Sirius was poised just above her, their bodies just barely touching as her nipples brushed against his chest, his dark brown messy hair had her hands tangled in it, his grey eyes dark with need, his muscled body vibrating as he tried to take his time, and he was all hers. She tightened her grip in his hair and pulled his face to her, kissing him deeply.

Sirius lowered his body and she could feel his member brushing against her core. "Sirius," she moaned, "please don't tease me, love," she begged. Sirius shivered at the sound of her voice, so raspy and pleading.

"Are you sure about this?" he asked one last time as he pushed forward slightly, pressing his cock against her more firmly. He had to be sure. If he did something she was uncomfortable with, he would never forgive himself. To his immense relief, the woman beneath him kissed him and breathed the answer into his mouth. A silent, 'yes.'

He moved into her slowly, and Luna didn't move until he was all the way in her. Her body quivered at the feeling and she had never felt anything so right. She bucked her hips against his, and he responded accordingly. Together, they set the perfect pace and kept perfect rhythm. Their bodies rocked together as they kissed and touched each other.

Luna knew that Sirius would be an adventurous lover. That he would tease her relentlessly, that he would want to be kinky, wild, and audacious, but this time; their first time, would be sweet and sensual. It would really mean something. They made love for a long time, until Luna just couldn't hold back any longer.

"Sirius," she practically screamed his name as she came closer to her peak, "Faster, love, fuck me faster," she commanded, and he obeyed, picking up his pace. If he was being honest, he couldn't hold back much longer himself. His body was pressed tightly against hers as her arms and legs were wrapped around him. Her nails were biting deliciously into his arse, urging him on as he pounded into her quickly.

He was tugging gently on her hair, and she was practically screaming beneath him in pleasure. "Yes, Merlin, yes, Luna," Sirius wasn't even aware of the words falling out of his mouth as he lost himself completely in her. "You feel so good, love, don't stop. I'm so close, Lu-Lu, fuck me harder."

Luna reached her orgasm just a moment before Sirius, and together they rode out the waves of ecstasy that overcame them. Groaning and screaming, they lost themselves in each other, in a tangled mess of sweaty limbs and sheets. When they finally were able to think straight, she only vaguely noted that he was still buried deep inside of her.

"Sirius," she whispered, her voice hoarse.

"Hmm?" he mumbled, his face buried in her hair, his lips brushing against her ear.

"You're…wow. That was just…there aren't words for what that felt like."

"Lu-Lu, you are the most incredible witch I have ever met," he kissed her again, letting the kiss speak for him, and it spoke loud and clear. She knew from that one snog just how much he cared for her; how deeply he loved her.

Sirius pulled himself out of her with a groan and summoned a blanket over their naked bodies as they started drifting off into a peaceful sleep curled up together. Half-asleep and half-awake, Sirius was thinking about the secret she had revealed to him. Aloud, he said, "Don't leave me, Luna, please, just stay with me forever."

"I'll never leave you, Sirius. I can't. You have me; heart, mind, body and soul."

He wrapped his arms around her, pulled her tightly against his side, and fell asleep, for the first time in his life feeling completely whole. Feeling like nothing was missing. That his life was entirely perfect because the woman sleeping in his arms was perfect.

Sirius had never expected to meet a girl who he would fall in love with, but he had and it was more than he could've hoped for. It was almost weird that she was the descendant of James, but it was fitting. She had his arrogance, his sense of adventure, she was a Marauderette in all senses of the word and she was his. His perfect other half. The witch who perfected him in ways he had never known that he was incomplete.

….

A/N: How is Sirius going to react to this in the morning? Is he going to tell James? Even though I've had this chapter written for a long time I've actually been playing with it a lot because I wasn't sure exactly how I wanted it all to play out so please let me know if you liked it!