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Sirius had said that the house was mostly to be empty today.
Mostly, because you never could really get rid of everyone at headquarters, and because Ron, Hermione and Ginny were still there, although set to do some mundane cleaning task by Mrs. Weasley.
Sirius had gotten him out of it, saying he needed Harry’s help with something else that was much more important than sorting through old Black memorabilia and cleaning out cabinets.
The much more important thing, Harry knew, was sex.
He tried to temper his excitement as he was led up the stairs and to an empty bedroom that appeared to have been untouched for a long time. It was fairly far away from the room in which the rest of the people in the house would be working on their cleaning, and far enough away from the downstairs that hopefully everyone still in the house would be none the wiser about what Harry and Sirius were about to get up to.
A minor feeling of guilt ate at Harry’s stomach for a moment. He’d never really kept anything from Ron and Hermione, but the gravity of this particular situation meant that it had to be done. For Sirius’s safety, he could never confide in his friends what he and his godfather did together.
The feeling was gone a moment later, though, as Sirius did a simple cleaning charm on the large bed taking up one wall of the room and took Harry’s hand, leading him towards it. The small guilt in his stomach had been replaced by a swooping, warm sensation of anticipation. Harry sat on the bed as Sirius performed a few more charms on the room, assumingly making it soundproof. This eased Harry’s nerves even more, the fact that he knew Sirius was as unwilling as he was to take the risk of anyone finding out about them.
“There we go,” Sirius said, turning to face Harry. “No one will disturb us.”
Harry's stomach flipped. It took most of his restraint not to jump from the bed and begin kissing Sirius immediately, but he knew Sirius liked to be in charge, liked to lead. But Harry knew Sirius could tell he was already itching to go by the look Sirius gave him, his eyes suddenly darkening as he looked his godson up and down, taking in every inch of his appearance.
Harry was flaming with desire, which tripled when Sirius growled, “Take off your clothes.” Which Harry immediately did, standing from the bed and getting his feet tangled in his pants in his haste to follow Sirius’s instructions.
Once naked, Harry turned and looked at Sirius for further instructions. He didn’t approach any nearer, though, and still was staring at Harry with those eyes full of lust.
“I just want to make one thing clear before we start.” Said Sirius, and Harry tried to stop the shiver that went down his spine at the authority in his voice. “You haven’t told anyone about us, have you?”
Harry emphatically shook his head. “No, of course not.”
“And you aren’t planning on telling anyone? Not even your friends?” Sirius had taken a step closer, and Harry’s stomach quivered at the small amount of space between them, his mind going blank while he looked into Sirius’s face.
“No, dad.”
The word had slipped out without meaning, without thought, and it took Harry a moment to realize what he’d said, embarrassment flooding through him at the slip up. He looked down at his feet, at the floor, anywhere but Sirius’s face.
“I mean – no, Sirius, I won’t tell anyone….” Harry trailed off, his heart hammering in his throat, and felt a gentle hand reach up and begin caressing his face, drawing his head up by his chin.
“What did you call me?” Sirius asked, his voice low, and the look in his eyes had changed. Harry couldn’t decipher it. Was Sirius angry with him?
“I’m sorry! I didn’t mean to, it won’t happen again–”
Sirius whispered in a soft voice, “But what if I want it to happen again?”
Harry stared into his godfather’s eyes, desperately trying to figure out what he meant, what was going through his head. “What do you mean?”
“You called me ‘dad’, Harry. What if I liked it?”
The pool of embarrassment inside Harry changed shape, and once again he was lulled into security by the tone and inflection of Sirius’s voice. He wasn’t angry. He had liked it. Harry was still a bit confused, though.
“Sorry,” Harry wished he could get his voice under control, as it was wobbling and quavering, “What do you mean, you liked it?”
Sirius’s thumb began running up and down Harry’s jaw, a soothing, possessive motion, “Do you see me as a father figure, Harry?”
The way Sirius said his name felt like a caress in itself, and Harry offered Sirius nothing but the truth, “A little bit, yeah.” He replied softly.
“That’s very interesting.” Said Sirius, stepping closer to Harry so that they were nearly nose to nose. “Because I happen to see you a bit as a son.”
And then they were kissing, Sirius pressing his mouth against Harry’s lips, forcefully parting them with his tongue as the hand around Harry’s jaw moved to his throat, light, playful. Possessive.
Harry kissed him back with all the pent-up emotions that were boiling in his body. He’d embarrassed himself, but Sirius had liked it. Sirius saw him a bit as a son. Harry saw Sirius a bit as a father.
This is so fucked, a soft voice seemed to say in Harry’s head, but he pushed his consciousness down, down, drowning it out with the feeling of Sirius on him, holding his throat, an arm coming around to embrace Harry around the waist and pull him flush against Sirius’s body. Harry could feel a tension in Sirius’s pants, knew that he must already be a bit hard. It usually took Sirius a bit to get ready, and to feel him already almost there took Harry a bit by surprise.
Was it because I called him dad? He wondered, and decided to test his theory, all embarrassment thrown to the wind, and moaned out between kisses, “More, dad.”
It seemed Harry’s theory on Sirius’s arousal had been correct, for the hand Sirius had clamped around Harry’s throat tightened for a fraction of a second before Harry was tossed backwards onto the bed, a low growl coming from Sirius as he positioned himself in between Harry’s legs. Harry noticed a distinct tent in his pants before Sirius was back on Harry’s mouth, his hands tangling in the boy’s hair, Sirius mumbling dirty, nasty, disgusting things to Harry in between kisses. It was insane, it was wrong, it was so sexy.
Harry had no idea why this was turning him on as much as it was, and doubly so for Sirius. A slip of the tongue and both of them were hornier than they’d ever been in previous encounters before this. Sirius seemed almost wild with the way he was attacking Harry’s mouth, yanking at his hair, peppering hickies along his throat and down his chest. Harry propped himself on his elbows as he watched Sirius go lower with his mouth, lower and lower until he was kneeling between Harry’s thighs, Harry’s dick already fully hard and dripping and ready.
“You are the sexiest boy alive.” Said Sirius, and he took Harry completely in his mouth. Harry moaned, the feeling of Sirius’s warm mouth around him almost enough to make him come immediately, and he nearly did, lasting only a few moments while Sirius swirled his tongue around the tip, licking up the dribbles of precome before Harry burst in his mouth with a loud yell.
Sirius didn’t release him, instead swallowing it all as Harry continued to cry out from overstimulation. Only when Harry was finished did Sirius let Harry’s once-again flaccid cock out of his mouth and unbutton his pants before crawling back over Harry’s body, face to face with him yet again, the smell of Harry’s own come on his breath as he whispered, “I love the taste of my son.”
It was so nonsensical, but so insanely sexy. Harry could barely think when Sirius’s mouth was back on his, and Harry could taste himself on his godfather’s tongue as they kissed yet again, Sirius’s fingers busying themselves inside of Harry hurriedly, clearly aching to fuck him already.
Harry felt the tip of Sirius at his entrance, and he was already so relaxed from Sirius sucking him off and the fingering that it was barely any trouble getting in, Sirius moaning into Harry’s mouth as he started a rapid pace, much less dignified and much more animalistic than they usually had sex.
“Dad, you feel so good.” Harry whispered against his lips, and Sirius’s pace stuttered, a groan of lust leaving his throat that went straight to Harry’s dick. He felt crazy, this felt crazy, but it was the best sex they had ever had, and Harry wasn’t about to stop for the reason of it being weird and strange.
Sirius continued to pound into Harry, filling him deeply and then pulling out, over and over again so that Harry could do nothing but moan out, “Dad,” every few thrusts. It became something of a mantra, and Harry could feel what it was doing to Sirius, with his hands gripped tightly on his godson’s waist, his grip so tight it was bound to leave bruises.
“Fuck, Harry, you’re so good.” Sirius breathed into Harry’s face; he was sweating, and beads of it were dripping off onto Harry’s skin, hot and erotic. “You’re so good to me, son.”
Harry whined, a desperate sound, for approval and praise from Sirius always drove him wild, regardless of the context. He wanted to please this man, wanted to make him happy, wanted to always hear these grunts and moans and wanted to be the one causing Sirius to make them.
“I love you, dad.” Harry whispered, and it seemed that that was Sirius’s undoing. Harry felt the man stiffen, his pace becoming even more delirious as he came inside his godson with a groan that seemed to echo inside Harry’s mind.
They sat there, panting, giving each other small kisses and mumbles of praise while the two of them tried to come down from the high they’d whipped each other into. Sirius pulled himself out, but before Harry could protest Sirius had taken off his clothes and joined Harry in the bed, maneuvering their bodies so that their heads lay against the pillows, Sirius’s arms around Harry in a tight embrace.
They were both out of breath, both seemingly lost in their own thoughts. Sirius was stroking Harry’s back with one hand, and Harry Sirius’s shoulder with his. It was a beautiful thing, Harry felt. It felt safe.
They breathed into each other, every once in a while sharing a light kiss, but no words were said for quite some time. It seemed they both needed some minutes to gather themselves, to put their minds back in proper places.
Finally, Sirius spoke in a soft whisper. “I can’t believe how much I enjoyed that.”
Harry’s heart stuttered in his chest. He didn’t know what else to say besides, “I enjoyed it too.”
“Do you really see me as…a father figure?” Sirius asked, the hand on Harry’s back still stroking circles into his skin.
Harry had no reason to lie. “I think I do. It’s complicated.”
Sirius gave a nod, as if this made sense. “I think it’s complicated for me too. But….” He trailed off, opting instead to give Harry another kiss.
Harry obliged him for a few moments before breaking his lips away. “But what?”
Harry could have sworn he saw Sirius blush a bit beneath his beard. “But why did I enjoy what we did so much, I was going to ask. But of course, you wouldn’t know.”
He was right, of course. Harry had no explanation for how erotic the two of them had found calling each other ‘dad’ and ‘son’ had been.
“Does it really matter?” Harry asked, and Sirius looked into his eyes. “I mean, this is just between us. We aren’t telling anyone. Nobody has to know.”
At this, Sirius broke out into a smile and kissed Harry again. “Right you are, Harry. This is our secret.”
“And…we can do it again…however many times you want, I mean.”
Sirius was already smiling, but his smile turned mischievous at Harry’s words.
“However many times I want?” He asked, and Harry could feel the hand that was stroking his back making its way down to clasp at Harry’s backside. “What if I already want it again?”
Harry felt his cock twitch. He matched Sirius’s smile and said, “Then I want it again too, dad.”