A/N: This is my first slash fic. Please be kind in your reviews, as I have never written one of these before.

Warning: This is slash. If you have a problem with homosexual relationships please don't bother to read this story, but if you're cool with it then go right ahead. No flames please.

Summary: WARNING: Slash AU post HBP. Sirius is sent to the future (not your typical time travel fic!) where he meets a handsome young man with emerald green eyes, who seems to know him and understand him better than anyone ever has before. Harry/Sirius

Disclaimer: I don't own Harry Potter or any of the wonderful characters in JKR's books, because if I did, Sirius would be alive. SIRIUS LIVES ON IN OUR HEARTS!

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Sirius Black was wandering one of the many halls of Hogwarts School of Witchcraft and Wizardry. It was around one o'clock in the morning and Sirius was debating a topic common to seventeen-year-old boys:

Sex.

Or rather, his recent complete lack thereof.

It wasn't like Sirius couldn't get girls – hell they were throwing themselves at him. He had to (sometimes literally) fight them off with a stick, all thanks to his incredibly handsome face, dark silky hair and beautiful gray eyes. No, getting girls definitely wasn't the problem.

He just wasn't interested in them lately. It was like he could barely see what attracted him to them in the first place. Meanwhile he'd begun to notice more and more frequently how incredibly hot some of the blokes at Hogwarts had become. When had that happened?

Suddenly he was in a sea of broad shoulders, flat stomachs and lean legs. He found himself wondering what it would be like to snuggle up with Remus by the common room fire, or drag Frank Longbottom into a broom closet. He'd even had some somewhat disturbing and yet exciting dreams involving he and James in rather – erm - compromising positions.

For the better part of a year, Sirius had been grappling with this. Mostly he had tried to ignore it, but that didn't seem to help much. Now that he thought about it, he'd always admired particularly beautiful boys, like James and Remus, but always in a more distant way, and not in such a sexual way as he was now.

He really didn't know what to make of it. Was he bisexual? Was he gay?

He still admired the female form, and he wasn't known as the girl-magnet at Hogwarts for nothing, but he never seemed to want to go beyond snogging.

And then something happened tonight that sent him reeling.

Remus, ever observant, had noticed these changes in Sirius' actions and behavior in general. Remus himself had come out the previous year, and by now he felt fairly confident that he knew the signs when a man was attracted to other men. It didn't hurt his suspicions any that he once awoke in the middle of the night to hear Sirius having what sounded like a very erotic dream about James. At any rate, he decided to confront Sirius about it, and waited until they were the only two left in the common room to bring it up.

Sirius immediately became flustered (which in itself was highly unusual) and started stammering a denial when Remus cut him off, placing his fingers gently on his lips.

Remus looked Sirius in the eyes and said, "I'm going to prove to you I'm right Padfoot." Before Sirius could even think to react, Remus kissed him. After the initial shock, Sirius found that he couldn't help but kiss Remus back, pulling the lithe young man closer and deepening the kiss. This was, after all, one of his fantasies, suddenly coming true.

There was heat, oh definitely more heat than any kiss Sirius had ever had with a girl, but still it was like any other snog session. There was something missing, which removed true passion from the kiss. When they pulled apart, Remus smiled gently; it was like he too knew that while they both enjoyed the kiss, they weren't meant for each other.

And he was okay with that.

Remus smiled gently at the still slightly dazed Sirius, got up, patted his arm and left the deserted common room, saying, "I told you so," as he went up the stairs to his dorm. It was a good five minutes before Sirius realized he was alone, and decided a walk was what he really needed to clear his mind.

And so dear reader, we find ourselves once again following Mr. Black down another corridor in Hogwarts School. But, 'Come to think of it, where the hell am I?' thought Sirius.

He looked around, and realized he hadn't been to this part of the castle in years. So long in fact, he wasn't entirely sure how to get back.

Just then, the familiar shuffling and mumbling of Mr. Filch, the caretaker, echoed down the hall. Sirius saw a door, and seizing his chance, he slipped inside the broom closet, closing the door as quietly as possible. He listened closely, and when Filch had passed, he let out a deep breath and took a step back. Unfortunately, there was a low shelf, which he smashed his head into, falling to the floor. Shaking his head against the pain, Sirius got up, took a wobbly step out of the broom closet, and headed back to the common room; not even noticing the familiar figure still slumped unconscious on the floor.

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About 20 years later…

Harry Potter was wandering one of the many halls of Hogwarts School of Witchcraft and Wizardry. It was around one o'clock in the morning and Harry was debating a topic very uncommon to seventeen-year-old boys:

Horcruxes.

More specifically where to find the last two.

It had been surprisingly easy to locate Slytherin's locket (a period of steady brainstorming with Hermione had brought them both to the conclusion that it was at Sirius' house – Regalus Black had somehow managed to steal it, but had died before he could destroy it) and Hufflepuff's cup (which was, believe it or not, in the Chamber of Secrets – come on, looking around the place had not been Harry's priority the first time he was there).

But now they were at an impasse.

They didn't know what of Gryffindor's or Ravenclaw's possessions Voldemort would have used as a horcrux, and Nagini was constantly in Voldemort's company, so they couldn't get to her until the end.

Having already accomplished so much over the summer, and with Hogwarts open again in the fall, Hermione had bullied Harry and Ron into returning to Hogwarts for their final year, on the promise that if they found the other horcrux they would set out immediately, no matter where in the term they were. In the interim, they were studying all they could and researching in the library. The Order of the Phoenix (now led more or less by Professor McGonagall, with the unspoken understanding that they were really guided by Harry himself) had come through with additional training for the Trio.

But even pushing all of that aside, Harry found that his heart ached for something real to hold onto once again. He had lost all his parental figures and his mentor Dumbledore, and even though he had patched up his relationship with Ron and Hermione (which had been rather disjointed the previous year), he wanted love.

When he broke up with Ginny, it was with a resignation towards his destiny. When the Trio returned to Hogwarts, she had wanted to begin again, but Harry found that his experiences without her (both before and after their breakup) had changed him. He couldn't be what she wanted him to be, and she wasn't what he wanted anymore. He began to wonder if he wanted any girl ever again.

He looked back on his previous relationships and found both lacking in what he hoped a true, meaningful relationship could be. He and Cho had been a disaster from the start – they never understood each other. And Ginny: while there had been a physical relationship, he was surprised when he looked back and realized he had shared nothing about his life or his feelings with her. They had a short, romantic, but ultimately shallow fling, and it ended when it needed to.

Now, he had thought of having other such shallow relationships, as he looked at the many girls (or guys – Harry had accepted that he was also attracted to men long ago) around Hogwarts, but found he wanted nothing of that. What he wanted was the closeness he had with Ron and Hermione, but with the understanding he had only ever had with Sirius.

He sighed. 'Sirius.'

Harry missed him dearly. He missed their talks, and the way Sirius always seemed to understand him. He missed the warm feeling in his heart when he and Sirius joked or hugged, or even raged at each other.

Harry had tried to bury the feelings after Sirius had died, trying to channel his anger for the fight and at the same time lead a semi-normal life. But that hadn't worked because Harry wasn't normal. He was Harry-bloody-Potter and he had to save the world.

He looked around, and realized he hadn't been to this part of the castle in years, if ever. Just then, the familiar shuffling and mumbling of Mr. Filch echoed down the hall.

Harry saw a door, and seizing his chance, he slipped inside the broom closet, closing the door as quietly as possible. He stepped back and fell over something on the floor. Harry looked at the unconscious boy on the floor. He seemed familiar somehow, but it was very dark.

"Are you okay?" Harry asked tentatively, gently shaking his shoulder. The young man groaned, but did not wake.

Harry sighed again, pointed his wand at the boy and said, "Mobilicorpus." 'Best take him to the hospital wing.'

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Sirius awoke to the bright morning sunshine, and let out a small groan, reaching for his aching head. He looked around to find he was in the hospital wing, and a quick survey of the room showed he was the only patient. A familiar head of messy jet-black hair was lying atop the mattress, where apparently James had fallen asleep watching over him.

Sirius smiled and shook his head. 'Prongs really is the best mate a guy could ask for. Better wake him before he gets in trouble for being here.'

Gently shaking him he whispered, "Prongs, hey Prongs."

The young man stirred, mumbled "Five more minutes, Ron," and promptly returned to the slow regular breathing of sleep.

Before Sirius could question who this Ron was, Madam Pomfrey bustled in with a vial of potion, which she gave to Sirius and said quietly, "Ah, you're awake." She looked at the sleeping boy in the chair and smiled sadly, "Mr. Potter was very worried about you, young man. He refused to return to his dormitory last night after he brought you here."

"Yeah, James is my best mate," Sirius replied, feeling a happy warmth in his heart that James had tried to take care of him.

Madam Pomfrey looked confused for a moment, and then asked a very odd question, "What is your name, young man?"

Sirius chuckled, "Come on, Madam Pomfrey, you can't fool a prankster. You know very well who I am."

"No, I'm afraid I don't," she replied seriously.

Sirius was surprised, but decided to play along for now. "Sirius. Sirius Black."

Madam Pomfrey's eyes widened in shock, before she backed away saying, "You stay here, I'll be right back." With that she practically ran into her office and shut the door, not returning until the hospital wing doors burst open and Professor McGonagall swept into the room.

The noise woke 'James', who sat up yawning, stretched his arms and rubbed his eyes before setting his glasses on his nose and looking at McGonagall with curiosity. "Professor, what are you doing here?"

McGonagall ignored his question and instead turned her stern gaze on Sirius, staring a moment before her eyes opened widely and she took a step back in shock. Not understanding this reaction, Sirius looked at 'James', who was turning to Sirius.

It was then Sirius' turn to look shocked, as James' eyes were no longer the familiar twinkling hazel, but a piercing emerald green that seemed to look right into his soul.

They stared at each other for several seconds, before Sirius asked, "Prongs, what happened to your eyes!"

The boy didn't answer his question, but instead asked in almost a whisper, "Sirius, is that really you?"

"Come on mate," Sirius answered shakily, "you know it's me!"

And before anyone could stop him, his friend swept him up into a fierce hug, crying, "I can't believe it, I can't believe you're back!"

"Harry!" cried McGonagall sharply, "we can't be sure this is truly Sirius."

'Harry' stepped back, staring at Sirius like his wildest dream had come true, and shook his head, "No Professor, this is definitely him. I don't know how this happened, but I would know Sirius Black anywhere."

Sirius smiled at the confidence in his friend's voice, but had to ask, "James, why are you answering to Harry, and why would McGonagall not know me? I see her in detention every week!"

"If I may, I believe I know what has happened," spoke a soft voice.