WARNING: THIS CHAPTER CONTAINS INCEST AND EXPLICIT SCENES.
Bellatrix was a lot smarter than she looked. Everyone knew she was a skilled duellist and fighter; she had the body to prove it, with long limbs and a toned physique for a girl only almost turning seventeen. Of course she had figured out her cousin was an animagus. She noticed the paw prints in their back gardens and when she and the others went to the black lake for late night swims or when she went with one or two of the others to fight and train, she often saw a wolf like dog running through the forests of the school grounds. He obviously just thought that she hadn't seen him and only he was seeing her. But yet he knew too much for him to not have been there. Slowly, over the past two years, she had pieced together parts in her mind to make her aware of his... condition.
Sirius on the other hand, didn't give his cousin the credit she deserved. She was incredibly smart. Perhaps acting as if she didn't care in class was her way of pretending she was just a pretty face. He braced himself, pushing the door to her bedroom open and slamming it shut behind him. She said nothing, just continued to play with her hair between a few fingers.
"If I show you just this once, you won't tell a soul?" he asked firmly. She nodded slowly, still not saying a thing. He removed his jacket and opened the first few buttons of his shirt. Without even a blink, when Bellatrix looked up from his jacket on the floor, instead of her cousin there was a great wolf sized dog in front of her, his dark fur thick and shining. She smiled as he walked closer and she got off the end of the bed, instead to kneel down in front of him.
"And you understand me?" she said, outstretching her hand to him.
He bowed his head in a nod, allowing her to feel his fur. "I must say, cousin, you make a very handsome dog," She chuckled in an undertone as he pressed his muzzle to her neck, pressing his face kindly to her followed by her body as she continued, "I think I like you more as a dog, honestly."
She sat back up on the bed, furrowing her eyebrows in a slight curiosity as she stood, "You're a lot smarter than you let on." She said as she straightened out her dress once more, her cousin returning to his more human self.
"As are you," He said, doing his few buttons up once more, "how did you find out?"
"I live with you half of the time we're not in that castle. Hard not to notice random massive paw prints in the manor's grounds, or the howling coming from the woods a few miles behind, even if it is four in the morning. Not to mention the fur that gets everywhere I might add."
Sirius couldn't help but smile, she was incredibly smart. No one else knew and no one else would ever know, "Very good, Bellatrix. You know my secret. You'll keep it to yourself as you promised?"
She nodded, "of course cousin. After all, blood ties us tighter than anything in this world will. And intelligence is not just my, but your virtue too it appears."
"Don't talk to me about blood. If it were my choice I'd not be bound by water to this family."
"Oh but then my darling, you'd be so bored... imagine your life without this whole manor, without that beautiful vault of money waiting to be yours one day. Without... me." She said innocently as she stood once more, pursing her lips and tilting her head to one side ever so slightly before running her fingers down his chest, grasping at his shirt and pulling him closer.
"Why can't you be like me." He said simply, not pulling her closer but not pushing her away either.
"Because that would be no fun." She answered honestly as she raised an eyebrow.
"For who?"
"For you. You wouldn't feel any guilt or even any shame, for being here with me right now. That wouldn't be fun."
Sirius looked down at his cousin, only a couple of inches shorter than him with her heels on, "You're disgusting."
"Am I? Or are you. You are after the one, not even stopping me. Face it cousin..." she said, dragging a long nail down to his belt, "You're just like me."
"I am nothing like you." He snapped, still neither pushing her away nor doing as she wanted.
"No?" she said innocently, "Why do you think so?"
"This whole family is all the same. Everyone wants to believe that you're better than other families."
"Darling," she stopped him, moving herself away from him, "That's because we are. Your so called friends will not always be your friends. Remember that. They will see you for what you are, what you are born into. You're a Black, whether you like it or not."
Something in him snapped as he rammed his cousin hard into the wall behind them, gripping her upper arms. He felt her tense only momentarily at his touch before she smirked, "It's in your blood, cousin. Hatred for half bloods and mudbloods alike."
"DON'T USE THAT WORD!" He shouted at her, hitting her back into the wall once more.
"What?" she laughed, hardly hurting, "Mudbloods? Like that sweet little red head girl... what's her name, Lily? Oh Sirius, watch me do far worse than what I did to her not long ago."
"That was you?" he growled, filling with more and more rage the more she spoke.
Bellatrix shrugged, her eyes never leaving her cousins, "she made good target practice."
His anger took the best of him as his hand, sudden hard and swift fell onto his cousin's cheek. Bellatrix hissed and looked back up at her cousin only momentarily showing her surprise before she laughed and crooned, "oooh, did I hit a nerve?"
Sirius was quick to draw his wand from inside his jacket and press it to her throat, "give me one good reason why I shouldn't kill you for doing what you did to Lily."
"You'd not last a day in Azkaban." She said calmly, hardly fearing the wand digging hard into her throat.
"I hope they take you away one day. Lock you in a cell and keep you there your entire life."
"Darling, I will always find a way of dragging you down with me. So if you truly want that of me, then you're coming with me." She said with a sly smirk.
She was sudden in pushing him off her, her hands hit his chest hard and he let go, dropping his wand. But Bellatrix had other plans, she didn't let him get his wand, instead, she pushed him hard once more onto her bed. She straddled his lap and leant over him, sinking her teeth into his neck until she drew blood and he was almost yelling in pain. Sirius was quick in gripping her hair and pulling her off, but her teeth were so far into her neck that it hurt even more getting her off. Nevertheless he turned her over, about to make a reach for his wand on the floor, but she was too quick. Her fingers found the back of his shirt and she pulled him, even though she was hissing in pain at his hands in her hair. She beat his hand out of her hair and pressed his hands down by his side, leaning over him to run her tongue along the wound she had left on his neck and up over his lips.
"You're insane." He snarled, though he was beginning to stop struggling against her. She leant down again and let go of one of his wrists to quickly pull his belt open.
"You love it." She purred against his earlobe, biting it teasingly.
Sirius said nothing for a moment, before he flipped her over, his belt now undone. He was quick to grab her dress and tug it up. They probably didn't have long but he didn't care, his hands were quick in freeing himself and luckily for him –and to his delight, she wasn't wearing any panties. He found himself on top of her and between her legs in a matter of moments. No sooner had his mouth found her neck than she was already squirming impatiently for him.
Sitting up, he gripped her by her dress and turned her over, pushing her dress up past her hips. About to pull herself up, Bellatrix, not at all surprised by her cousin's actions gripped the sheets and let her eyes close for just a moment in complete pleasure as Sirius sunk himself deep into her wet heat. His hands were in front of her shoulders as she lay on her stomach. Lifting her body to him, she gripped his forearms as he gave her no chance to warm up but instead started thrusting hard and fast into her. She couldn't help but moan aloud, biting her lower lip hard as he forced his entire length into her with each and every thrust.
"Filthy slut," he growled, leaning over her and biting at an exposed part of her neck to leave a love bite on her sweet, golden skin.
Her toes curled, the high, spiked heels straining against her feet as she did so, and her slender legs spread further apart to allow him access. Her body arched perfectly against his as he repeatedly hit her sweet spot over and over again and her moans of 'oh Sirius!' became louder, edging her increasingly closer and closer already to an intense orgasm. His hips hit to her over and over again, not caring if she was hurting or if it was too much but in fact wanting her to hurt.
He gripped her hair in a fistful, pulling her head back and using her hair as leverage to get himself into her as deep as possible. He felt her tense around him as an orgasm flooded her body, her legs trembling ever so slightly and her nails digging into arm he had left above her shoulder. Her tight, wet heat clamping around him stopped any control he had, as after a brutal session, he finally filled her with his seed. She gripped at the sheets, both of their bodies covered in a thin layer of sweat.
Bellatrix was quick to turn and lay on her back, too exhausted for just a moment to say anything, as was he apparently as he dropped onto his back beside her. She gripped her dress and pulled it down to cover herself once more. Sirius was quick in doing up his belt and tucking his shirt back in and was first to stand.
"We're not the same." He said definitively.
"Lying to yourself isn't going to do you any good you know." She answered, sitting upright and then standing once more, correcting her hair and walking out of the room to rejoin the party downstairs.
Was he like her? Of course not. But would he have done half of things he was doing with her behind closed doors if he wasn't? Surely not... Sirius took his time in going back to the ballroom. By the time he went down, it was well past midnight, most of the families had left, and the only ones left were the Lestrange and Malfoy families, along side of course, all of the Black family. He didn't see his cousin then for the rest of the night, presumably with her friends in another room drinking and talking about how much they hated half bloods and muggle born witches and wizards. Little did Sirius know, his next encounter with his cousin was going to be a lot more interesting than tonights, and he wouldn't see her for quite a while.