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Sirius lounged against the kitchen bench as he stared at Rowan Salamander. The man was undoubtedly a spy because he was almost certainly Regulus Arcturus Black. It wasn’t that the transfiguration was terrible. Regulus had turned his shock of black curly locks into something straight, lifeless and dirt coloured. Those silver eyes that Sirius knew better than the back of his hand were now amber. In fact, he’d changed practically everything except his nose.

That made Sirius smile. Regulus was ridiculously proud of his nose. It was thin and pointed with a kink in the middle that Regulus thought made him look rugged. Sirius remembered the day he’d got it, falling off his broom and breaking it with a loud snap. Their parent’s wands had never been particularly suited to healing spells and the Episkey their father had cast had done a poor job.

It didn’t matter. Regulus had been thrilled.

Now he had the nerve to try and sneak into the Order, Sirius’ Order, and pretend like that nose wasn’t firmly embedded in his subconscious. Like Sirius wouldn’t immediately recognise the way he hugged his arms around his midsection while he was talking or how he tapped his fingers against his elbow when he was nervous. An action that he hadn’t stopped doing since he’d arrived.

What the fuck was he playing at?

He hadn’t talked to Sirius in years at this point. Their last civil conversation had been the day Sirius left. They’d spent the morning in the library, with Regulus reading and Sirius pacing. He’d been nervous. Father had an announcement to make, and Sirius had dreaded what it was which as it turned out was rightfully so.

That night Regulus had pleaded with him not to go, his hands smearing through Sirius’ blood as he tried to hold onto his wrist. Sirius pulled away and jumped out of the window to fly into the night. He would never forget Regulus’ stricken face as he screamed after him, that very same blood on the windowsill where his hands dug in like he couldn’t let go. It was probably still there. After all, Kreacher never bothered to clean his room, and Regulus would think it was sentimental.

Now he was simpering next to Gideon like he hung the moon, and jealousy burned deep in Sirius’ stomach.

How dare he?

The others went about their business around him, ignoring the fact that Sirius was staring daggers at the new guy. Mostly because that was not a particularly unusual situation. Sirius was inherently distrustful of new people, and they were in the middle of a war. It was generally expected that Sirius would needle them until they broke, or he got bored. A perfect system really.

Regulus laughed at something Gideon said, and Sirius slammed his glass down on the bench. For a moment their eyes met when Regulus looked up in surprise but the instant he caught Sirius’ burning gaze he averted his eyes. Gideon put an arm around his shoulders and murmured something comforting in Regulus’ ear and Sirius tried to crush his glass into smithereens.

He was about to say something when the meeting started, and Regulus looked so hopeful that something stayed Sirius’ hand. It twisted something inside him to see that expression after so long. Those wide eyes and soft mouth reminded him of better times in meadows and hiding under blankets. Not a betrayal so vile it made him want to vomit.

The meeting was basic. Individual members were assigned roles and told what locations to apparate to. From there they would travel to secure locations. Regulus was quiet, sitting next to Gideon with his arms wrapped around himself, his hand tapping away. Sirius didn’t doubt that he would go home with nothing. The Order was careful with their secrets.

After the meeting had finished, Sirius stalked over to where Regulus was talking with Gideon.

Gideon rolled his eyes. “Sirius, give it a rest, would you?”

“What?” Sirius sneered. “You don’t want to introduce me to our new recruit?”

Gideon clenched his jaw and glared. “Not if you’re going to be a dick about it. No.”

Regulus bit his jaw as Sirius huffed out a sigh of annoyance. “Maybe he likes it when people are dicks to him. I don’t kink shame Gids.”

Gideon’s laugh filled the small room as Regulus glared at him, his cheeks blushing bright red. His breath came out in a puff as Gideon elbowed him in the side.

“See sweet cheeks. He may look like an arse, but Sirius is alright.”

Sirius watched as Regulus tried to control his emotions. He was pissed. Regulus didn’t like to talk about sex or kissing or any sort of physical affection. Their household had none of those things and whilst Sirius had learned about them from the arms of his friends, Regulus had not. The cold confines of Slytherin held none of that warmth.

Sirius hated how he was letting Gideon put his hands on him. If Regulus were himself, he would never allow it. Gideon didn’t deserve that privilege. His jealousy flared red and hot once more.

Regulus treated him to a weak smile as Sirius leaned in to whisper in Gideon's ear. “He’s a spy mate. Without a doubt. Pretend I’ve told you something about Benji and leave. I’ll deal with him.”

Gideon didn’t even flinch. He laughed again as he coughed out, “the fucker said what?” before running off after Benji.

Regulus shifted from foot to foot before he asked, “What’s going on?”

Sirius took a swig of his beer. “Benji is spreading a rumour that Gideon is fucking his brother.”

Regulus spluttered. “What!?” Sirius doubled over with laughter as Regulus glared at him again. “That was a joke? You’re sick.”

He went to walk past Sirius who grabbed his wrist and pulled him into the nearest empty room. Regulus crossed his arms across his chest and tapped his elbow again.

“Gideon was right. You are a dick,” he grumbled.

Sirius barked out a laugh. “You have no idea.”

That should have been it. Regulus was a spy. Sirius should have obliviated his memories of the meeting and sent him on his way. They would go back to being strangers and he may never see him again.

But Sirius didn’t want that. He wouldn’t want that. Regulus was right here within his grasp and even though he knew he should, he couldn’t let go. The more he thought about it, the more excuses he came up with. It wasn’t 100% certain that this was Regulus. It could be a young man with the same nose and similar mannerisms. Maybe Sirius was being paranoid.

He settled back against the wall and mirrored Regulus’ stance, his arms wrapping around himself. “So how do you know Gideon?”

Regulus looked at him out of the corner of his eye. He licked his lips and finally met Sirius’ stare with a chin raised in defiance. “Why should I tell you?”

Sirius put down his drink and stalked forward, until Regulus was backing up against the wall. The little shit refused to back down, merely clenching his jaw as he stared stubbornly up at Sirius.

“It’s a war. You could be a spy. I think you have it backward pretty boy,” Sirius sneered. “You need to prove yourself to me. Not the other way around.”

Regulus bit his lip before reluctantly replying. “We met at a bar and started talking about our families. I didn’t have the easiest childhood. My parents are monsters. He convinced me that fighting in the war could help me escape all that.”

They were the words Sirius had always wanted to hear. He had gone to bed every night hoping that one day Regulus would appear on his doorstep and say those words. It stung that he was hearing them now and it was almost certainly a lie.

“And you expect me to believe that?” Sirius growled through gritted teeth.

“It’s true!” Regulus declared and Sirius could almost believe it from the truth shining out of his eyes. That is if they weren’t currently fucking amber. All he had to do was come to him as himself. Not some off-brand fake.

“And what did they do that was so monstrous? Reduce your broom time? Ban you from hanging out with your half-blood friends?” Sirius hissed, “This isn’t a fucking game kid! You could die.”

“I’m gay!” Regulus yelled.

Sirius froze. Regulus? Gay? Never. The Regulus who couldn’t look at another person for more than two seconds? The Regulus who darted to the locker rooms the moment he finished a quidditch match because he could stand the sweat on his skin?

“Fuck off,” Sirius scoffed. “You look like butter wouldn’t melt in your mouth. I hardly think it’s in the market to take a cock.”

Fury was written in red splotches all over Regulus’ face. Oh, Sirius loved it when he looked like that. Part of the reason he was such an annoying bastard was because whenever he did Regulus’ face would look like that and he loved it. That raw unfiltered anger and passion. Sirius lived for it. He kept pushing and pushing until Regulus exploded and came out of his closely repressed cage. Then in the moments after he was truly himself.

Regulus ground his teeth and clenched his fists. “It’s true.”

“Right.” Sirius laughed again and leaned over with a leer. “I tell you what, pretty boy. If you press those sweet lips right here, I might believe you but ―”

Without warning Regulus launched himself at Sirius, cutting him off mid-sentence as he slammed his lips against him. Sirius was so shocked that he gasped, sucking in Regulus’ air in the absence of any other and Regulus pressed forward, sweeping his tongue inside Sirius’ mouth. Caught off guard in more ways than one, Sirius was surprised by the intense pleasure of it. This was his brother. He knew it was.

What on earth was Regulus thinking? Was he that desperate to be a spy that he would happily tongue kiss his own brother? Or did he really want this? Regulus was kissing him like there was no tomorrow. He invaded Sirius’ mouth with a deliberation that was shocking and to his surprise Sirius loved every minute of it.

Before he really knew what he was doing Sirius was kissing him back. He pushed him until they were against the wall, Regulus’ body tight against him. The kiss was the most erotic thing Sirius had ever felt. This was his brother. The only person on this earth that he loved more than himself and it shouldn’t feel this good.

They both groaned and the sound went straight to Sirius’ cock. He slid a hand up Regulus’ back to fist in his hair while the other grasped his hip and pulled them tightly together. Sirius could feel the hot press of Regulus’ cock over his thigh. Was Regulus enjoying this or was he just a good actor? Maybe he was thinking of some pure-blooded slag while he was kissing his own brother.

The very thought of it made him furious. He gripped Regulus’ hair tighter before biting down hard on his lip. The sound that came out was half whimper and half moan. It drove Sirius insane. He wanted more. More of the moans and maybe more of the whimpers. He wasn’t sure exactly which he liked the best.

Maybe he just wanted more of Regulus. This was like having a flood after a drought. When you have been starving and try to drink too much water. He needed it like he needed air.

More

More

MORE.

Sirius pushed away and took a couple of steps back. He rubbed his hands over his face as he tried to calm down his racing heart. His cock was achingly hard, and his hands felt shaky. When he dropped them to his sides to look back at Regulus his breath caught.

He looked thoroughly messed up. His lips were swollen and glistening. His stupidly brown hair was sticking up at odd angles. Those fucking amber coloured eyes were glazed and kiss drunk and to top it all off he was leaning back against the wall and puffing like he was on the edge of collapse. His cock was sticking out of his pants like a flag of surrender. It was taking everything Sirius had not to sink down to his knees and worship it.

“That was,” Sirius licked his lips and Regulus’ eyes darted over to follow the movement, “unexpected.”

Interspersed with heavy breaths Regulus replied, “I told you. I’m gay.”

If it had been any other person Sirius would have been convinced but Regulus had always been smart. Maybe he’d given himself a potion that made him act this way. Sirius had never once suspected that his uptight and secretive little brother was this way inclined. He wanted to believe it. He did. There was also a part of him that wanted to know if this was a charade, how far was he willing to go?

If Sirius pushed, when would he break?

“You’re a very good kisser,” Sirius complimented, fluttery feelings invading his stomach and making him on edge.

“Oh?” Regulus blushed and looked down. “Thank you.”

Sirius stepped forward and placed his hand against the wall next to Regulus’ head. Leaning down until they shared the same breath again Sirius murmured. “We’re compatible, pretty boy. What do you say we lose this joint? Come back to my place and you can show me how good you are at other things.”

Sirius trailed a finger down the centre of Regulus’ back making him arch into him. He leaned down to lick a stripe up his neck and watched as Regulus’ pulse fluttered. His sweet and innocent little brother was undoubtedly turned on and Sirius loved it. If this was just a potion, he was going to be fucking livid.

“I ― I hardly know you,” Regulus stammered.

“So?” Sirius argued as he pulled their bodies close again and kissed along his shoulder. “I would make it good for you and I could hardly deny your intentions when my cock is buried in your arse.”

Regulus whimpered and Sirius couldn’t help but press his thigh against Regulus’ cock and rub. “But we’re ―” He bit off what he was saying with a gasp when Sirius nibbled on his collarbone.

“We’re what?” Sirius asked innocently, half hoping that he would admit what they were to each other, and half hoping for the opposite.

“We ― we’re strangers, and you’re obviously so experienced. I ―” Regulus broke off and looked away.

He was a virgin. He had to be. But there was no way that he would admit it. The Black family pride ran in all of them, but Regulus had always had one of the worst cases. People thought it was Sirius, but it was Regulus who couldn’t stand failure. It was Regulus who would do anything, be anything to be considered the best in the eyes of his parents.

Sirius grinned as he gasped Regulus’ chin and forced him to look at him. “I’ll be gentle.” He traced a finger along his jaw. “I’ll be so good to you. I’ll treat you like the most precious of treasures.”

He meant every word, but he wished it were different. In another world Regulus would come to him and ask for his help. Sirius would protect him with his life. He wouldn’t have to try and fuck him just to make him admit who he was.

Regulus’ eyes had gone wide as dinner plates, the irises a tiny speck of Black amongst all that yellowy brown. Fuck he hated that colour. Part of the reason he wanted to take him home was so that he could finite that fucking transfiguration spell and look at Regulus the way he was meant to.

“Okay.”

It was so quiet that Sirius had almost thought he’d imagined it. He had to have imagined it. Regulus wasn’t going to go through with this. This was his virginity. How deep in with the Death Eaters was he, if he was willing to go this far? With his brother!?

Sirius was furious but a part of him, deep down, was delighted. A part of him was hungry. A part of him was imagining Regulus lying underneath him moaning as Sirius fucked in and out of his hole. Would he lean into it? Would he try and pretend to be more experienced than he was? Would he scream out Sirius’ name as he came?

“Say it again,” Sirius demanded as he slowly rutted his cock against Regulus’ thigh.

Regulus cleared his throat as he arched his back, letting his own cock rub against Sirius. “Okay.”

Sirius had definitely heard it this time, but he couldn’t resist the opportunity to make Regulus squirm. “Okay, what?”

Regulus huffed in annoyance, his hands grasping Sirius’ shirt so that he could say it into Sirius’ ear. “Take me home.”

Sirius nipped the lobe of his ear and growled, “And do what, pretty boy?”

“Fuck me,” Regulus groaned. “Take me home and fuck me.”

Sirius buried his head into Regulus’ shoulder and breathed in for a moment. He smelled exactly the same way he used to, Lavender, dark magic and that musky scent that was quintessentially him. This was the moment he could back out of this. He could come clean, and they could talk about things like a pair of normal people.

Or he could take him back to his apartment and fuck him till dawn.

He grasped Regulus tightly and apparated them with a pop.

Regulus was freaking out.

Outwardly his disguise was still in place and his face was settled into a pleasant mask, as Sirius dragged him into his bedroom, but inside there were sirens screaming and emergency lights flashing, as his body kicked into panic. Sirius had just apparated them into what appeared to be a very bland and boring apartment. It had a strange other worldliness about it, which Regulus assumed meant that it was very muggle. There were lots of gizmos and devices strewn about in various stages or disrepair. Almost like they were a type of decoration.

None of this was going to plan. It was supposed to be simple. Get close to Gideon. Attend an Order meeting and then report everything back to the Dark Lord. Regulus had been so confident and sure. Gideon was easy to befriend and even easier to trick. He’d just had to add enough of the truth to make his story seem plausible. After five nights Gideon had been ready to promise Regulus his firstborn child, if that would help him get away from his horrific parents.

Not that Regulus wanted to get away from his parents. No. That would be like something a blood traitor or a bad son like Sirius would do. He would do what was asked of him. Like marry a cousin he wasn’t even remotely attracted to. He was prepared to take potions and cast spells on himself just so that he could do his duty. There were far more important things on the line than carnal pleasure.

The fact that he had wanted to tear Gideon’s shirt off with his teeth had made the ruse a little more believable but that didn’t mean anything. Gideon was very attractive for a man. Besides this was all for the sake of the mission. He could do it. He could bear a little bit of embarrassment if he could bring information back to the Dark Lord. Everyone would be so pleased that they wouldn’t care how he had done it.

At least that was what Regulus had told himself when Gideon was touching his back or his arm in that familiar manner. It made him nervous and jittery. That’s all. The heat he was experiencing was because of his anxiety. He was a spy. All this was to be expected.

He was handling it.

That was until he’d arrived and realised that Sirius would be there. Sirius who was looking at him with undisguised fury. As though Regulus had committed the gravest of betrayals. The fact that he had, made it that much harder to bear. There was no way Sirius could know it was him. His transfiguration was flawless. The only thing that he could possibly recognise was his nose and the only reason Regulus didn’t change that was because he was afraid he wouldn’t be able to get it back exactly. He could handle not having the same colour eyes or hair, but that nose reminded him of one of his fondest memories of Sirius and he refused to change it.

When Sirius had dragged him into the spare room, he had thought he was done for. Sirius would reveal everything and then Regulus would be taken prisoner. For a moment he thought that might not be so bad. Some time away in prison might be nice. He wouldn’t be asked to kill anyone or witness any murders. It might be like a little holiday.

Then Sirius had pissed him off. His refusal to believe that Regulus was gay had lit a fire within him. It wasn’t so hard to believe. He had thought that Gideon was attractive for a few moments. Of course, he was nothing like Sirius who was built like a Greek God, all fine lines and finer features. Not that he really wanted to kiss Gideon. Not like Sirius who was everything he’d ever wanted. He had thought more than once that marrying his cousin wouldn’t be so bad if they looked anything like Sirius.

Sirius had the nerve to goad him, and he didn’t even think before he pressed their lips together.

But when he did…

Regulus had been unprepared for how much he enjoyed it. He tried to tell himself that he was doing great. Surely if he was convincing at this, then Sirius would let it go, and he could go back to his mission. The jolts of pleasure that he got from every one of Sirius’ gasps and the throbbing heat in his cock was just ― just evidence of his commitment to the cause.

He could admit to himself now that he’d gotten carried away. People had always gossiped and said that Sirius was good at kissing and ― other things. They weren’t lying. Being kissed by Sirius made him feel like the most important thing in the world. It was almost enough to convince him that his brother still loved him. If his brother had any idea who he was.

When they stopped that first time Regulus felt like he was on another planet. His consciousness was floating somewhere up near the ceiling. Sirius’ words were filtering through and hitting all his pleasure centres. He was saying things like Regulus was a good kisser and how compatible they were.

Regulus had tried to resist him, but every kiss kept pulling him further into Sirius’ orbit. He started to think maybe it wouldn’t be so bad to lose his virginity to Sirius. After all, he was the purest blood there could be. It’s not like he could get pregnant for it. What would be the harm? Then Sirius would trust him, and he’d be able to get all the information that the Dark Lord wanted.

Now, as Sirius dragged him into his bedroom, Regulus frantically tried to think of a way out of this. He couldn’t. Sirius was his brother. If he ever found out, he would never forgive him. Their bond was already irrevocably damaged. They may never recover from this.

The bedroom was slightly less strange than the rest of the apartment. The bed was made of blocky, plain wood and the sheets were grey. It was nothing like Regulus would have expected. There wasn’t a single naked woman or man on the walls. There wasn’t even a quidditch poster.

Sirius sat down heavily on the bed and pulled Regulus in between his legs, his hands running up and down Regulus’ thighs.

“Come on, pretty boy,” Sirius patted his thighs, “get on up here and let me see you.”

Regulus let him pull him into his lap, his neck burning. Sirius made quick work of the buttons on his shirt, yanking it off him before sucking a nipple into his mouth. The sound that left his mouth was not one that Regulus recognised. It sounded breathy and obscene and for a moment Regulus didn’t believe it had been him. But then Sirius pulled him down onto something hard and hot and he couldn’t stop it happening again.

“You’re so reactive,” Sirius murmured as he nipped lightly at Regulus’ other nipple. “Such a good boy for me.”

Fuck. Regulus let his head fall, and his eyes closed as his back arched into him. Hearing Sirius compliment him was making him feel floaty again. He’d always enjoyed being told how good he was at things, and this was Sirius. Sirius who hadn’t said a kind word to him in years. It was ecstasy.

Suddenly Sirius was pushing him off his lap and Regulus struggled to his feet. Before he knew it Sirius’ quick hands were at his buttons and then his pants were around his ankles. He stepped out of them awkwardly trying to cover up his painfully engorged cock.

“Close your eyes pretty boy,” Sirius commanded.

He was frowning and Regulus was suddenly even more nervous. “Why?”

Sirius stood and took his face in his hands. “Just trust me.”

Regulus scanned his face for signs of anything out of the ordinary and saw nothing. He wanted to trust Sirius, he did, but he had been burned by him before, and his heart was so sore from it. Not that it mattered, as he didn’t have a choice. It was: do what he wanted or tell him the truth, and Regulus couldn’t. He couldn’t face the look of betrayal as Regulus explained what he was really doing here.

He closed his eyes.

His skin tingled as the warming charm settled over him. It felt so good to feel his brother's magic again. There was a gentle elegance to it that always made him feel safe and secure. Heat sunk into every part of his body as Sirius’ magic caressed him. There were no words, just the sensation of energy touching his skin. No part of him was sacred. When Sirius finished his legs felt wobbly and body was heavy.

“Open your eyes, pretty boy,” Sirius murmured.

When Regulus opened them, he found Sirius sitting on the bed again and looking up at him with reverence in his eyes. Something clenched deep in Regulus’ chest. He loved that look. He would do anything to get it again. He would grovel. He would crawl.

“Fuck, you’re beautiful,” Sirius murmured with reverence before commanding in a gravelly voice, “Come here.”

Regulus climbed into his lap and sunk down until his arse was directly over Sirius’ hard length. His cock rested against Sirius’ stomach, and he resisted the urge to buck into him. He let his arms trail over Sirius’ shoulder and then down his back.

He let his lips hover over Sirius’ ear. “I want to feel you.”

Sirius hissed in a breath and bucked up underneath him. “Fuck yeah you do.” His hands landed on Regulus’ arse cheeks and held him down while Sirius ground up into him. “I bet your hot little hole is starving for my cock. It’s alright sweet cheeks, I’m gonna fill you up soon enough.”

Regulus moaned. He loved and hated how Sirius was talking. The crassness was shocking, and it turned him on more than it should. He could feel himself getting carried away again.

He shook his head. “That’s not what I meant. I want to feel you.” He tugged at the singlet Sirius was wearing.

Sirius raised an eyebrow and grinned as he leaned back on his hands. “Well come on then. Take it off.”

Regulus’ hands were shaking as he tugged the fabric out of Sirius’ jeans. Sirius obediently raised his arms so that Regulus could pull it over his head. Regulus couldn’t believe his eyes. It was like Sirius was made of marble, each abdominal muscle a perfect creation. Regulus ran his hands over them with wonderment.

“How are you even real?”

Sirius chuckled and then tugged him down to kiss again. It was so much more intense when they were skin to skin. He let his hands wander over Sirius’ body as their tongues moved lazily against each other. It wasn’t enough. Regulus needed more ― wanted more ― but he couldn’t articulate what that more was, so it simply came out as a wordless whine.

Sirius chuckled again. “It’s alright, baby. Let’s get you ready.”

He flipped them until Regulus landed with a bounce on the bed. Shuffling up until his head was on the pillows he lifted up onto his elbows. Sirius stood and in one clean movement shoved down his jeans. Regulus’ breath caught.

His cock was huge.

It was long and a dark pink that made Regulus think of roses and tulips, not a monster that was surely going to rip him in half.

He gulped.

Sirius reached down and pumped it a couple of times. It was the hottest thing Regulus had ever seen. Fuck. This was real. They were really going to do this. Sirius’ normally bright eyes were dark as they roved over his body. Regulus wished he was seeing him and not some fake.

As Sirius clambered back onto the bed Regulus held out his hands. “Wait.”

Sirius crawled up beside him and lay down on his side with his head resting on his hand. “Yes?”

“I ― I’m a little scared,” he admitted begrudgingly. “You’re huge.”

Sirius barked out a laugh and pulled Regulus into his arms. Regulus gasped as their naked bodies came to rest against each other. Their legs were tangled, and their cocks were rubbing.

Sirius’ kiss was unexpectedly tender, and he murmured, “I would never hurt you,” between presses of his lips.

After a moment he pulled away and stroked Regulus’ face. “I tell you what. If you don’t like something and you want it to stop, all you need to do is say that you don’t love me.”

“What?” Regulus exclaimed.

He couldn’t. Those words have been screamed between them a hundred times before. During their traumatic teenage years and Sirius’ disownment. Now it felt too real to say it. Especially when he didn’t mean it.

Sirius shrugged. “Come on. We’re practically strangers. It’s a great safe word.”

“Right,” Regulus lied.

Sirius was kissing his way down the column of Regulus’ neck whilst his heart broke into pieces. They were strangers. This was nothing special. Sirius would be just as gentle and sweet with anyone.

Sirius licked his nipple making Regulus jump. “Is that alright pretty boy?”

Regulus arched his back as Sirius sucked his nipple into his mouth, his reply more of a moan than words. “Gnnnn. Yes.” Sirius bit down and Regulus screamed it again, “YES.”

Sirius chucked, “Did you like that?”

He had shuffled down the bed and yanked Regulus’ legs apart. His eyes were roving hungrily over Regulus’ body. This at least was unchanged. The body that Sirius was seeing was unequivocally his. He hadn’t changed it, having not expected to be sleeping with anyone tonight.

Sirius grinned at Regulus as he palmed his cock. “Come on pretty boy. Did you like it?”

Regulus fisted the sheets as he tried to speak. “Y ― Yes. Yes. Fuck yes.”

Sirius’ hair caressed his skin as he leaned over and licked a stripe up his cock. Regulus bucked at the intense pleasure of it. In response, Sirius pressed his hands into Regulus’ hips as he took Regulus into his mouth. Regulus was overwhelmed by the feeling. It was hot and wet. Sirius’ tongue kept caressing just underneath the ridge, sending shudders through his body. His voice was coming out in ragged whimpers.

He was far too close to the edge. Every sensation was overwhelming. This was nothing like when he touched himself. For starters, Sirius had complete control over him. He quickly brought him to the edge before withdrawing and kissing his thigh.

“Sirius, please,” Regulus gasped in a plea.

Sirius nipped the inside of his thigh. “Tell me you love it.”

Regulus blushed. He did love it. There was nothing on this earth he would rather have more than his brother’s hot mouth on his cock. His body was so turned on, he felt like he would explode any minute.

He covered his face with his hands and whispered. “I love it.”

Suddenly a wave of magic buried inside him. It tingled against his hole and Sirius spread his legs even wider. Without warning he felt something wet and slippery sliding along his pucker. It felt strange and different but not unpleasant. After a while it started to feel really good. His cock, which had been left abandoned for this completely new area, was throbbing desperately.

“Sirius!”

Sirius ignored him and Regulus could feel his magic invade his body again. It was followed by a finger which slid in through the now slippery entrance. Regulus arched his back, and his mouth fell open in shock. The stretch of it stung but Regulus soon forgot all about that as Sirius swallowed his cock back down.

Regulus didn’t know how long they continued with Sirius bringing him to the edge before stopping and adding another finger, then starting it all over again. By the time Sirius’ four fingers fit inside him he was a blubbering mess. He breathed in and out slowly, trying to focus on the air coming in and out of his lungs as he worked through the overwrought sensations running through his body.

When Sirius finally stopped and brought his cock up to rest against Regulus’ entrance, he was pleasure drunk and dazed. Sirius’ eyes were wide and crazed. If Regulus didn’t know for sure otherwise, he would be almost certain that Sirius knew what they were doing.

“Last time to back out, pretty boy,” Sirius teased. “Just four little words.”

Regulus surged up onto his elbows and hissed, “Don’t you fucking dare stop now!”

With a delighted laugh, Sirius pushed inside. Regulus’ mind went white. The pain mixed with the feeling of being so full inside his brain, until he couldn’t tell one from the other. Sirius leaned forward so that their skin was hard against each other, Regulus’ oversensitive cock trapped in between.

“It’s so big,” Regulus whined.

“Shh,” Sirius soothed. “You’re doing so well. Just say those four little words and I’ll stop.”

“I don’t ― I can’t,” Regulus jerked as Sirius slid a hand between them and gently massaged his dick. “Sirius, please!”

Sirius drew Regulus into a kiss, their mouths working against each other in slow motion. All the fury and intensity had gone out of their actions leaving something tender and heartfelt behind, that was making Regulus’ heart clench. Was Sirius always this generous a lover? Did he always turn kind the moment his cock was inside you? Regulus hated the jealousy that burned in his chest when he thought about it. He wanted Sirius to himself.

He always had.

“Not long now,” Sirius murmured, pressing kisses to his neck.

He kept completely still except for his hand running feather light touches over the tip of Regulus’ cock, smearing the precum along the sides. His other hand was running down his side and along the curve of his arse and up his thigh. Regulus shivered from the sensation and realised that for the first time he had the perfect opportunity to explore his brother’s body.

His first touches were tentative, a pass of his fingers along his bicep as another carded through his hair. Sirius groaned and rewarded him with a nip on his shoulder. Regulus took this as a sign to be bolder and scraped his nails down Sirius’ back.

Sirius gasped and arched his back making his cock finally move inside Regulus. It wasn’t so much of a thrust as a rub, and it touched something deep inside Regulus that felt very good. In response Regulus lifted his legs and wrapped them around Sirius.

“Fuck,” he cursed, “what did you ― more, please, more.”

“That’s it.”

That was all the warning Regulus received before Sirius started moving in earnest. He thrust inside with long languid strokes each one ending with that spot inside that made it feel like Regulus had been hit by lightning. All he could do was lie back and take it. His hands no longer had the strength to explore and resorted to fisting into the sheets again.

“You feel so good,” Sirius panted. “Why does this feel so good?”

Inside Regulus’ head he crooned, because I was made for you. We were made for each other. Two stars created to circle each other for all eternity. But he couldn’t say that. To Sirius he was just Rowan Salamander, a handsome stranger that he just happened to have chemistry with.

He couldn’t help the words that slipped out of his mouth. “I love you.”

Sirius paused and looked at him with wide eyes. “What?”

“I love you,” Regulus whimpered, “Please don’t stop. Please.”

Sirius scanned his eyes intently before clenching his jaw. “Alright.”

He levered himself up and grabbed Regulus’ hips before jerking forward hard. This time he kept up a punishing pace hitting that spot time and time again. In no time at all Regulus’ was screaming out his orgasm, Sirius’ name on his lips.

As he painted his own chest white Sirius slowed, his hips rolling gently as Regulus collapsed. Regulus felt like he could suddenly see and feel everything. The sound of the sheets rustling underneath them. The beads of sweat running down Sirius’ chest. The way Sirius felt, still buried deep inside him as though he had always meant to be there.

“Hey,” Sirius murmured gently against his jaw as he kissed his way back to Regulus’ mouth. “You okay, sweetheart?”

“I love you,” Regulus stated again.

Sirius smiled that bright brilliant smile that Regulus hadn’t seen in years. “Just you wait until tomorrow morning and it feels like your arsehole has been torn in two.”

“It won’t matter,” Regulus confessed.

Sirius gave him such a stricken expression that Regulus thought for a moment that he’d fucked it up. Had he accidentally said, ‘I don’t love you,” by accident? He didn’t get a chance to ponder too much because apparently that had been enough to goad Sirius into moving again. He began fucking Regulus hard in between muttering under his breath.

“―making me think―”

“―fucking with my head―”

“―it can’t―”

“FUCK.”

Sirius came with a scream as Regulus watched. It was a sight to behold. His muscles tensed and his mouth dropped open in the ecstasy of it. He could feel the throb of his cock inside him and the warmth. It sent him straight over the edge.

They collapsed together in a mess of cooling spend and ragged breaths.

His orgasm felt like it lasted forever, cum spilling out of him in endless ropes. He hated that he had lied, and that Sirius had no idea how much this meant to him. Struggling to find the words he fought against his drooping eyelids and heavy limbs.

I love you, he thought as the blackness took him.

Sirius woke up early the next morning and stroked Regulus’ cheek. Regulus was just as beautiful in the morning light as he had been, writhing underneath him, his cock buried deep inside. He had dispelled the transfiguration work the moment they’d entered the room, under the guise of a warming charm. It had been worth the risk. Everything had felt so much more real when he was looking at his brother and not the simulacrum.

He should regret what they had done, but he couldn’t. His only wish was that they could do it again and again, every day for the rest of their lives. Soon Regulus would wake, and he would have to pretend to be asleep. Maybe he’d had a change of heart through the night, and he would come clean, so they could do it again. Sirius couldn’t take the chance that he would freak out and run away.

Regulus groaned and Sirius quickly closed his eyes.

He stayed completely still as he felt the mattress shift and the blankets move. For ten breaths Regulus just lay there and did nothing. Sirius ran through countless situations in his head. He regretted it. He was looking at Sirius with disgust right now. They’re never going to see each other again. This is the end of ―

He felt Regulus move and realised after a moment, that he was swinging his legs off the bed. Regulus padded off to the bathroom, his footfalls soft sounds against the carpet. Sirius opened his eyes and looked at the dent in the pillow he’d left behind. Its emptiness felt like the future.

Suddenly, the door to the bathroom burst back open and Sirius closed his eyes again. He heard Regulus ferret about on the floor for something before running back into the bathroom. His breath left his body in a huff. Regulus must have found out his transfiguration had slipped.

Sirius was sitting up when Regulus walked back in looking like Rowan once more. The sight filled Sirius with hope and despair. Hope that he could continue the lie, and they could meet like this again. Despair because above everything, all he wanted was for Regulus to admit what they meant to each other.

Regulus cleared his throat. “I ― I’m sorry if I got a little intense last night. I ― I haven’t done this a lot and that was ― really something.”

Sirius’ heart sank but he forced himself to smile. “It’s okay. I have that effect on people.”

Regulus scoffed and staggered forward to pick up his clothes. Sirius’ eyes trailed over his body as he covered up the marks and the love bites he'd left scattered over his skin. He hated it but there was nothing he could do to stop it.

When he did up the final button of his shirt Sirius said, “Don’t go to Gideon next time. Come to me.”

Regulus raised an eyebrow. “What do you mean?”

“To get to order meetings,” Sirius explained before leaning forward to leer. “We can go and then come back here and end the night the same way.”

Regulus blushed and Sirius hated that it wasn’t with his own face.

“You want to do it again?” he asked nervously.

For Sirius that wasn’t even a question. There was never any doubt that he wanted this again.

“Yes. Repeatedly.”

“Oh,” Regulus breathed out his eyes wide and wondrous as he looked over Sirius’ still naked form. He smiled slightly. “I’d like that.”

Sirius got out of bed and cupped Regulus’ head in his hand. Regulus leaned into his touch and it broke Sirius to let him go.

“Come whenever you want,” Sirius offered, pressing kisses to his cheeks, “I’ll be here.”

“Okay,” Regulus agreed, catching his lips.

That last kiss felt like it lasted a lifetime.

When they finally broke apart and Regulus left the room, Sirius sank to his knees. Until now, his only goal had been to protect his friends and survive this war. Now that had flown completely out the window. He would betray everyone if it meant that he could have Regulus moaning underneath him again. He’d burn the world if it could be truly him and not some shell Regulus had cooked up.

If you love something, set it free.

But if it doesn’t come back…? Well, that’s what cages are for.