Fic: Opening Doors, Sirius/Harry/James, NC-17
Title: Opening Doors
Author: foreword
Rating: NC-17
Pairing(s): Sirius/Harry/James
Disclaimer: I am definitely not JKR, and make no claim as to owning these fine young lads.
Warnings: chan, dub-con, incest, AU
Author's Notes: I wrote this for maeglinyedi for the 2006 sirry_slash exchange, and the reveals for it have more or less happened over the past week.

A million thanks again to Aspen for the awesome beta! *_*

*

The door is open when Harry gets home. It's not just unlocked – the door has been pushed open, and no one has bothered to shut it. Harry is instantly worried, remembering what he's read about, what Sirius told him about. He can't help but think about the way his mum went out, all those years ago. About his dad coming home to an open door.

And now, with Pettigrew on the loose… Harry has his wand out as he crosses the threshold, listening intently. There's something that sounds like banging, or fighting, or something, coming from one of the upstairs bedrooms, and Harry's leaping up the staircase before he can stop to think about it.

Really think about it.

Someone was a bit more careful about closing this door, it seems, and Harry hears what sounds like a struggle in the room beyond. With a glance over his shoulder, he turns the doorknob, and the door opens easily, unlocked and swinging free.

Being an adolescent, Harry has experienced his share of uncomfortable moments with his father and Sirius. There was that time, late one night, when Harry stumbled upon Sirius, propped up on the kitchen counter with a strange witch's head between his legs. He hadn't expected to find them in the kitchen at that time, and he'd certainly not expected to be so turned on by it, but he'd spent the rest of the night wanking in his room.

There was also the time he'd tried to wake Sirius last September. James was working that morning, and Sirius was supposed to take him to King's Cross. Sirius had apparently gotten quite hot in the night, it turns out, and Harry had chosen the wrong morning to crawl into bed with him.

He'd had awkward experiences with his father, too, of course. Just last week, he'd gone to step in the shower only to find his father stepping out of it. But they're family, of course, and Harry usually tries not to think too much about what either Sirius or his father look like naked, or what they might get up to while naked.

So it's perfectly understandable that Harry, once he has caught sight of the scene before him, finds himself unable to move.

Stretched out on the bed in the room with the unlocked door is his father, and stretched out on top of his father is his godfather. They're currently cursing at each other, which might just help to explain this all away, except that both of them happen to be naked, and Harry's got a pretty good idea where Sirius's cock is, right now.

"H—Harry?"

Sirius has caught sight of him, but he's squinting a bit, like he's not entirely sure that what he's seeing is accurate. Harry wants to die of embarrassment, but still can't seem to move from the spot, can't seem to stop staring.

James grumbles something that sounds vaguely threatening, and Harry's stomach flips as Sirius continues fucking his father. He's starting to feel like he can move again, but Sirius hasn't taken his focus off of Harry. He's still squinting at him like he can't see properly, but a look of understanding is starting to take form in the way he's staring at Harry, the way his hips are slowing in their movements.

Sirius curses, his eyes wide as he pulls himself off of Harry's father, who is also cursing now. Harry swallows hard and takes a step back, intending on making his way swiftly to his own room, and instead tripping over his heel. He crashes back against the open door just as James sits up, and he misses the mixed expressions on both of their faces as he knocks his head against the bottom of the door.

The door swings shut again, just as it was when Harry found it (and, he laments, how he probably should have left it), and he can hear the bed creaking as both his father and Sirius race to his side.

"Are you okay, Harry?" James asks, and Harry blinks up in surprise as his very naked father knees beside him, touching his head worriedly. But Harry is not terribly concerned about his head at the moment – he's more worried about his father's erection being in such close proximity to his face. He's trying very hard not to look at it, but he keeps noticing the way it catches the light, and he's sure that his father's cock is wet.

"Harry?"

Harry blinks and shifts his attention to Sirius as he sits up, who is actually grinning at him. Harry really doesn't see what is so funny about this, but it's entirely like Sirius to be so flippant about it. As if his father can read his mind (which Harry sincerely hopes he can't, because he can't seem to stop admiring how nice Sirius looks without clothes on), James begins admonishing Sirius for the grinning. Harry is sure he feels a lecture coming on, and he turns to look back up at his father.

And that's when Sirius, with obvious intent, bumps Harry firmly in the back with his knee. Harry suddenly finds his father's cock brushing up against his cheek wetly, and James's lecture is stopped before it ever really starts.

Both Harry and his father freeze, James's cock still just barely touching Harry's cheek, wet and warm and still quite hard. Somehow, Harry's thoughts are fixated on the scene in the kitchen last summer, with Sirius and the witch. It surprised him at the time, that someone would think to put their mouth there on someone else's body, but now that he's here, and now that James's cock is pressing up against his cheek, he can't help but wonder what it would be like to try it.

Behind him, Sirius clears his throat, and when he speaks, Harry can tell he's about to burst – with laughter, or pride, or something else, Harry isn't sure. Whatever it is, it seems to bring James out of his trance and he starts to move. Harry can't say what inspires him to tilt his face, just that little bit, but he does, turning his face so that the tip of his father's prick drags across his lips.

James makes a noise, a choked, surprised noise, and now it's Sirius that has gone quiet, but it's too late to stop now, Harry thinks. He rather likes the noise his dad has made, and he wants to see if he can get him to make it again.

He parts his lips just a little against the head of his father's cock, and it feels slippery against his tongue as he opens his mouth wider, taking it in.

"H—Harry—" James says, but he never finishes, and he's not pushing him away, so Harry doesn't stop.

It's slippery and salty and Harry can't help but make a face at the taste, but he presses on, taking his father's cock as far back towards his throat as he can before letting it slide all the way out again as he tries to imagine what he would like.

He's only started to find a rhythm when he's being pulled away. But not by James – he finds Sirius's arms wrapped firmly around him as his godfather drags him bodily away from his father.

"That's enough," Sirius grumbles against his ear, and Harry looks wildly back at his father, a sinking feeling telling him he's just done something that he'll never be able to take back.

James, however, is watching Sirius, a bewildered and somewhat dazed expression on his face. He hasn't moved from the spot. Harry loses sight of him in the next second, though, as Sirius shoves him roughly down on the bed.

Sirius looks almost angry, and Harry decides that he's going to apologise, except that now Sirius is kissing him, pinning him to the bed with his body, and pressing his lips against Harry's. He hasn't shaved today, and his scruff is scratching Harry's mouth and chin as he kisses him, but Harry sort of likes the feeling.

And then Sirius is pushing his tongue into Harry's mouth, and Harry has the distinct impression that he's tasting James on Harry's tongue. He can feel Sirius's erection jutting into his thigh, and Harry is even more turned on now than he was the time he caught Sirius with the witch.

Sirius pulls away a moment later, and from the look on his face, he's noticed just how turned on Harry is. He's grinning down at him crookedly, a strange mix of pride and excitement, and Harry is starting to wonder if Sirius has thought about this before.

The mattress shifts underneath them as his father joins them on the bed, and Harry catches a look from him that confirms his suspicions. Sirius must have talked about this – about him – before. The thought excites Harry, though he tries his best to keep his expression neutral.

"Harry, are you okay?"

James's voice is surprisingly calm, though there is a definite note of concern in his tone. Harry is more than just okay, though, and he hopes his father won't make them stop. "I'm fine. Promise."

James still looks a little dubious, but Sirius hasn't moved off of Harry even the slightest bit. Instead, he sits back so that he's straddling Harry's thighs. He's a bit heavy, even though Harry's sure he's not sitting with all of his weight, and he's still quite naked.

Sirius is currently engaged in an expression argument with his dad, and Harry takes the opportunity to let his gaze wander. Sirius's erection is even more impressive than Harry remembers from that one September morning, and Harry is embarrassed to note how prominent the obvious bulge in his own trousers is.

"Like what you see, Harry?"

Flushing what he's sure is a bright red, Harry hurriedly looks away, towards the door he'd had such an unfortunate run in with earlier. He's not sure how to respond to that, whether or not he should like what he sees, or even whether or not he does. He's mostly intimidated, to be honest, but that's the last thing he wants to tell Sirius.

"Sirius, don't harass him," he hears his father say, and Harry is somewhat relieved, though still embarrassed.

"I'm not harassing him," Sirius answers conversationally, and Harry feels him fumbling with the top button of his trousers. It's enough to make him turn his attention back to Sirius, and when he is rewarded with a cheeky grin, he decides that it was probably exactly what his godfather intended.

His zip follows the button quickly, and Sirius wastes no time in tugging down Harry's trousers, forcing his shorts to pull down a bit as well. He reminds Harry of Ron on Christmas morning, unwrapping packages excitedly. But Harry really can't think about Ron right now.

Sirius has tugged Harry's trousers down around his thighs, and then he fishes Harry's cock out of the slit in his shorts, already hard, though a good deal smaller than Sirius's. Sirius doesn't seem to mind, though, because he spits in his hand before taking hold of it, and Harry gasps involuntarily at the touch. His heart feels like it's jumped in his throat, and he can hear it beating louder than anything else in the room. He doesn't think anything has ever felt so good. Sirius leans over him then, his fist pumping slowly over Harry's cock, and he's kissing him again, softer this time.

His father makes a choked sound behind him, and it reminds Harry of the sound he made earlier. Sirius pauses at that, raising his head just enough so that he's not kissing Harry any more, and looks over Harry at James. "He's got to learn somehow," he murmurs, "it's best that he learns with us."

Harry's heart swells, and Sirius kisses him again, his hand still moving, squeezing and sliding across Harry's cock, and Harry can't help but shift into his touch.

"Sirius," Harry hears his dad say, and Sirius stops as he looks over Harry at his father. His grip loosens, and Harry pushes himself up onto his elbows, finally looking over his shoulder at James and trying to figure out what the two of them are on about.

James's expression is tight, conflicted, and he's staring at Sirius almost angrily. Sirius, when Harry glances back at him, is giving James a pleading sort of look, and Harry hesitates for a moment before speaking up.

"It's okay… I mean, I want to. It's not just okay, I mean."

He's stuttering over his words, not sure exactly what to say, or what his father needs to hear that will make this really okay, or if anything can. But James's expression softens, and Harry hears Sirius speaking in an undertone to his father.

"You can't be careful forever, James. Just because…" he trails off, but Harry has a pretty good idea what Sirius is referring to. Growing up, Harry's favourite part of any day was the after-dinner storytelling with Sirius. Harry has learned about Marauders his whole life – wild, daring rule-breakers whose friendship was more important than anything else -- and yet, he'd never been able to see how his father could have been one of them. According to Sirius, James has never been the same. Not since that day he came home to an open door.

James curses under his breath, and Harry watches Sirius's face fall. Things are about to go to hell fast.

Harry manages to wriggle his way out from under Sirius, much to his godfather's indignation, and after kicking off his trousers, he approaches his father. He's not sure that this is the best idea – he's not even sure this is a good idea, but it's the only idea he has. He wants to make this okay.

He's kneeling on the bed beside his dad when he kisses him, his t-shirt damp with sweat and his shorts still a little tugged down from Sirius's hasty removal of his trousers. James looks surprised just before Harry presses his lips against his, and there is an awkward bump of foreheads and glasses as they each try to angle in the same direction. He kisses Harry back without hesitation, and Harry slides his way across his father's torso, until he is perched on top of James, kissing him still, his knees planted on either side of his father's hips, Sirius making annoyed sounds behind him.

James raises his arms until he's resting his hands on Harry's hips, and Harry's glasses are starting to get foggy from their breath, but this is okay, and Harry starts to relax. He lets his father push his hips back and down, until he's straddling his lap, and Harry can feel James's cock pressing up eagerly against his.

His father kisses differently than Sirius does; long, lazy, slow kisses that draw Harry in and almost make him forget their surroundings. James slides a hand up Harry's side, over the shirt that's sticking to him, and his other is reaching around, slinging around Harry's hip as his fingers sneak under the waist of Harry's shorts.

Harry has started to move in a rhythm with the kisses without meaning to, rocking ever so slightly against his father, his erection bumping up against his dad's with every movement, his fists clenching in the duvet underneath them as Harry tries to hold on.

He can't, though, and in a moment, his muscles are tensing, his breath catches in his throat and he's coming, pumping jizz into his thin cotton shorts in a final slick slide against his father. He begins to sit up, embarrassed, but as he does, he feels the mattress sink underneath them as Sirius takes hold of him, straddling James just behind Harry.

He's surprised when he feels Sirius behind him so suddenly, but there is something comforting about the feel of his godfather's scruff against his neck as Sirius reaches around, hooking his thumbs in Harry's shorts. He's being pushed forward before he realises what's happening, and suddenly he's face to face with his dad again, James's chest heaving beneath his as Sirius makes quick work of tugging off his damp shorts.

Now he can feel his father's erection, unobstructed against Harry's lower stomach, his own cock wet against James's inner thigh. But then Sirius is lifting him, pulling him back so that he's straddling James again and Sirius is pulling his t-shirt over his head, knocking off his glasses in the process.

Sirius doesn't seem to mind, though, and he chucks them off of the bed with Harry's t-shirt as his arms encircle Harry, and his hand takes hold of Harry's cock. James makes that noise again as Sirius starts to stroke him, and Harry wishes for his glasses so that he could make out the expression on his father's face.

"You okay, Harry?"

This time it's Sirius asking, and Harry glances over his shoulder, bewildered and breathless. "Yeah," he answers, "'course."

He doesn't immediately realize that he's gripping the duvet again, but Sirius laughs, and it's a warm rumble against his ear. He's already getting hard again in Sirius's fist, and he can feel Sirius's erection pressing up against his arse. It seems only right that Harry reciprocate, and so he does, licking his palm before reaching behind him and finding Sirius's cock.

Sirius falters only slightly in his rhythm at the first touch of Harry's fingers, and then he's stroking him even harder as Harry takes hold of his cock. It's hard to get a good rhythm from this angle, and Sirius's cock is much thicker than his own, larger than what he is used to handling.

He tries his best though, working his fist over his godfather's prick in slow, careful strokes at first, movements that quickly become harder, faster, and less controlled. Harry is soon bumping his hand against his own arse, and Sirius's breath is ragged against his ear. He's matched Harry's speed, and Harry doesn't think he'll last much longer like this.

There is a whispered "fuck" from James, and that's what stops it – Sirius abruptly clutching Harry's hand to stop him while stilling his own grip on Harry's cock.

"Lube?" Sirius asks his father, his voice breathless and his tone rushed.

James shifts under Harry, and he's reminded of his father's arousal again as it shifts against him. "You're not—" James starts, but Sirius cuts him off.

"No, you are."

Harry's not sure what they're arguing about, but he's having trouble understanding why they've stopped when things were going so well.

"Harry," Sirius says, and Harry twists to face him, letting his fingers idly brush over Sirius's erection again.

"How do you feel about sex, Harry?"

His father makes a strangled noise, and Harry considers Sirius quietly, feeling embarrassed at his own inexperience.

"It's okay to say no, Harry. This isn't something you have to do," his father says quietly, and Harry continues watching Sirius, meeting his gaze.

"What if I want to?" he asks finally, and Sirius smiles at him.

"Lube, James," he says, still not taking his eyes off of Harry. It's not a question, this time, and Harry feels his father shift underneath him. When he turns back around, James is reaching forward, handing Sirius a small tube.

"Did you like the way James's cock felt earlier?" Sirius asks suddenly, his tone conversational. "When it was in your mouth?"

James sputters some curse words at this. Harry can't imagine what Sirius is getting at, and he glances over his shoulder at Sirius curiously. His godfather is busy slathering the contents of the tube across his cock, and he looks up at Harry expectantly.

"Yeah, I did."

Sirius smiles in response. "Good. You should try it again."

"What about –"

"We'll get to that."

Harry doesn't argue. He turns again, leaning forward over his father until he's on his hands and knees. He has to move back slightly, so that he can position himself just right, and he can only imagine what a sight he must be for Sirius.

He takes his dad's cock in his hand carefully, mouthing over the head before taking in as much as he can. It's not slippery this time, and it drags heavily across his tongue. There's too much for Harry to take all of it in, and soon it's bumping past the back of his tongue and he's gagging on his father's cock. James moans weakly, and Harry pulls his head back again, pausing to wipe a long string of spit from his chin before he wraps his lips around James's cockhead again.

He's just starting to get the hang of this, and his father's cock is sliding more easily against his tongue now, when he feels Sirius's cock, wet and slick and hard, pressing against his arse. Harry tenses in surprise, just managing to keep his jaw from clamping shut. There's no way Sirius's cock is going to fit there. There's no way.

He's marveling at how Sirius expects it to fit, still, when Sirius begins pushing a wet, slick finger in past the tight ring of muscle. He clenches around it, and it feels so strange, but Sirius continues to wiggle it in deeper, sliding it in and out of Harry's hole in smooth, steady thrusts, until Harry thinks this might feel okay.

He's just managed to start wriggling his tongue against James's cock while he's sucking it down when he feels Sirius add a second finger. The second burns just a little as Harry feels the stretch and pull of muscle, but after a while, that's okay, too. Harry's tongue is starting to feel a little raw against his father's cock, but he's enjoying the taste and feel of it filling his mouth.

He expects the third finger when it squeezes inside of him, and again he feels the stretch and pull. He slides his knees further apart, his arse jutting up a little higher than his head still, and that seems to help as Sirius wriggles and thrusts his fingers inside of Harry.

Harry has gotten so used to this, in fact, that he's almost upset when Sirius pulls his hand away, his fingers slipping easily out of Harry's hole. He juts his arse back almost unintentionally, hoping to feel those fingers working him from the inside again, but now there is slick, hard, cock pressing against him, and Harry has only a moment to prepare himself before Sirius is pushing past the tight ring of muscle. Harry swallows against the cock in his mouth at the stretch and burn and pull as Sirius starts to fuck him, thrusting in and pulling back in long, careful strokes.

He's rocking Harry against the mattress with every thrust, and Harry can't seem to keep his father's cock in his mouth. Instead, it slides against his cheek and hands and lips, and Harry's face feels wet with cooling spit and precome as Sirius slams into him.

The bed is creaking beneath the effort of Sirius's thrusts, and he's picking up speed as he fucks him. Sirius is gripping his hips now, his fingers digging in as he pulls Harry back onto his cock with each thrust in, and James has tangled a hand in Harry's hair. He feels like he is going to be tugged apart by the two of them, and then Sirius drops a hand from his hip, sliding his arm around Harry until he's gripping Harry's cock again, and Harry is unable to focus on sucking James's cock anymore.

Sirius is pumping him in time with his thrusts, and Harry feels his balls clenching, and then he's coming hard, moaning against James's cock as his body tenses and clenches, and then he's making a mess of the sheets and Sirius's hand. His godfather's palm is slippery against his cock, but he doesn't let go, still fucking Harry even as Harry is clenching around him.

"Oh, fuck," he hears Sirius whisper then, and he's shooting his spunk inside of him, and Harry can feel it, warm and wet and dripping its way out as Sirius slides his cock out of him.

He intends on turning his attention back to James's cock, but Sirius is pulling him back, wrapping his arms around Harry's torso, and before Harry can object, he's being lifted from behind, and set down on James's cock.

"What the fuck are you doing, you—"

James's objections are cut short, just as before, by Harry. Harry starts to move on top of him, enjoying the way his father's cock feels inside of him, and it feels different than Sirius. Harry can't help but gasp as he shifts himself back onto it, and James curses under his breath. He hears Sirius say "fuck," again, but before Harry can worry that he's done something wrong, James starts to shift his hips in rhythm with Harry's movements. Harry has hardly started to move before James is coming with a shout, his fingers gripping the duvet just as Harry's were earlier, and his body rigid beneath Harry.

And then it's over, and Harry is sliding off of his father as Sirius flops down beside them, and they are all lying together, sweaty and spent. Harry thinks he could get used to this, as he closes his eyes.

"So," Sirius says, when Harry's just on the verge of sleep, "what's for dinner tonight?"

James, not bothering to open his eyes, grumbles something in answer that doesn’t sound much like food to Harry, and Harry smiles. Sirius laughs, the same quiet, grumbly chuckle as before, and it's the last Harry hears before he is drifting off to sleep.