WARNING: This chapter contains bestiality and explicit content. Not for the light hearted.

"You're a liar." Sirius stated simply as he watched his cousin ring out her hair, still wrapped in a towel.
Bellatrix frowned momentarily in confusion before she rolled her eyes at her cousin, "whatever."
"Don't just give me that 'whatever'!" he growled, "I saw your father here earlier!"

Bellatrix paused before she sat up, her voice now low in anger, "I'm going to go to sleep now. In the morning, if I find that you're still here, I will know that you've accepted that I have my own life and go and do my own things that are not your concern, therefore I don't need to tell you. If however, I wake up and you're not here, I will understand that you're an absolute moron who can't keep his nose out of my business and also can't handle the fact that I won't stand it!"
"Who are you fucking?" he spat.
Bellatrix was quick to slap her cousin, "how dare you!"

As they both knew as well as one another, Sirius's temper was just as bad as Bellatrix's. "HOW DARE I?" he shouted, recoiling from her slap furiously and gripping her wrists to grip hard in his hands and push above her head before he growled, "You want to play that game with me, Bella? Because I assure you I will win."
"Let go of me!" she shrieked, kicking him away. With his free hand, he grabbed at one of her legs to pin her down properly.

"Come on cousin, fight harder." He spat viciously at her, easily able to pin her.
"LET GO!" She snarled, leaning forward to her cousin to free one of her legs, wrap around him and lock him tightly so she was in control.
He still gripped her wrists, but she was quick to free herself as she twisted out of his grip and grabbed his arm, holding it as if she was going to break it.

"You want to play rough?" she purred, leaning down to him as he grit his teeth and running her tongue along the side of his face.
He recoiled once more, pushing her off him to which she fell on her stomach. He gripped both of her arms, pulling them behind her and pulling her up. She mewled, hissing in pain, completely stuck in this position.
"Maybe this time we should," he growled, suddenly flipping her over and pinning her hands above her head with one strong arm, the other hand gripping her throat tightly and squeezing, "Who is it? Who are you fucking?"
"No one." She said, fast becoming desperate.
"No? Then what are you doing? Going out killing muggleborns for the hell of it? No. You wouldn't hide such a thing from me. You'd shove it in my face." He snarled, his unrelenting grip starting to hurt.

"Sirius..." she groaned, his grip on her now really starting to hurt.
"What?" he pouted sarcastically, "am I hurting you?"
"Sirius..." she groaned again this time in almost a sweet purr, pursing her lower lip and moving her legs from under him to hook one around his waist and pull his body in closer to hers, "please."

"You're not going to get away with it by trying to fuck me."
"But you're hurting me." She said, batting her lashes a couple of times at him.
"I don't care." He tried, though he had no real intention of hurting her, he let go of her wrists an placed the second hand over his first. She parted her lips in attempt to get some breath, scratching at his wrists. She was sudden and quick, knowing she was fast not only loosing the fight but her breath. She gripped at his waist and used him as leverage to kick him off.

Managing to throw him off, she breathed hard for a moment, before grasping him by his hair. He was too quick, he grabbed her upper arms and pinned her back down. By now, they weren't fighting for a reason, they were fighting for nothing, and they loved it. He threw her to the ground, grabbing her throat again.
"Dog." she spat at him.
"Whore." He spat back.
"GET YOUR HANDS OFF ME!" she shrieked, slapping him hard. The slap dizzied him and his hands loosened.

"Let me show you what happens to whores like you." He snarled, and no sooner had she gotten herself free than standing in front of her was the great big black dog.
Clearly she had angered him too much, and she had pressed a few buttons with the 'dog' remarks. He growled lowly as she moved back onto her bed to attempt to get to the other side of it before he had jumped onto the bed and pinned her by the back of her shoulders. She couldn't move again and his unrelenting grip didn't help. Her screams were muffled by the blankets on her bed. He growled darkly, biting hard at the back of her shoulder to leave a set of teeth marks in her. She mewed, whining into the blankets and struggling against him.

His huge paws pressed into her shoulders, forcing her down into the bed. She attempted to turn suddenly, but his paws remained where they were. He bit and tore at the towel around her body, dragging his teeth across her back and suddenly she was still. She gasped, she knew she had worked him up enough, but this, she was not expecting. He growled darkly as a threat, though he noticed she had stopped struggling now. Her hair was splayed out as she had thrown herself forward earlier and his paws moved from her shoulders to just above them. Suddenly and by no means being gentle, Sirius was quick to force himself into her, making her mew in pain, arch and squirm to him, he was too big, she couldn't take him all, but with a few violent thrusts into her wet heat on his part and a few whimpers from her, he was finally, fully into her. Her legs spread automatically; she couldn't handle it all in her with her legs so closed. He licked the wound he had left on her shoulder and the back of her neck as he growled slightly, starting to push himself roughly into her, his thrusts ragged at first, she squirmed. His hot breath on the skin of her neck and back sent shivers down her spine as he sped up immediately, starting to thrust roughly into her.

"Mmmh, yes," she moaned, she couldn't help herself, he was so thick and big in her, she felt full only with half of him in her.
Her fingers grasped around his big paws tightly as she arched her back up to him, spreading her legs for him to do with as he pleased. His quick and violent motions almost threw her forward with every thrust, and her shoulders met his arms as he continued to push himself into her. She spread her legs wider, arching her back high up against him and pressing into his great, fur covered body.
"Oh, Sirius!" she moaned, closing her eyes for a moment.

He wanted her whimpering and doing everything he wanted her to. He let go of her and pulled away for a moment to turn back into his human self. Before she could even turn around, he gripped her wrists and pinned them above her head with one hand and with the other, gripped her hips to pull her body back to him. Finally, she was able to take most of him in her, her hips met his thrusts as he slammed into her repeatedly. Her legs were shaking as he hit her sweet spot over and over again, her moans increasingly getting louder and louder as she already neared a climax. But Sirius was far from done. He pulled her back with him, bending her over the side of the bed rather than on top of the bed. He continued to thrust into her, now pressing her harder into her mattress.

"Sirius-" she tried but he was quick to tell her to shut up. His hand landed hard on her ass eliciting another mewl, though she didn't move away in the slightest bit. Bellatrix was never one to shy away from pain and he knew it. She arched her hips to her cousin, letting out another moan as she felt his mouth between her legs, teasing her and tasting her. After but few moments of having his mouth on her hot, wet heat, she reached her climax. He tasted her sweet juices, letting some drip down her legs before he was back inside of her. He forced her head down onto the bed as he thrust into her once more, grasping her hips tightly and soon after feeling her slick walls clamp down on his thick, throbbing member as she reached yet another orgasm, soon followed by him. He groaned as he filled her with his thick, hot liquid, pushing himself as far into her as he could.

He pushed her onto her bed, letting her go beneath him as he walked back into the bathroom to get his clothes. He was furious at her and he never knew why he couldn't just be angry –he always had to do this. She was a temptress, filled with beauty and rage and that was exactly why he needed her and why he went back to her every time. Not saying a word to one another, Sirius turned back into his animagus self and lay in bed with his cousin, allowing her to press to his warm fur, though she didn't need to in the sweltering heat. They left the large floor to ceiling balcony doors open, the hot weather and private grounds of no concern to either of them. Bellatrix's back was to the great dog's body as they slept, comfortable in the company of one another and the secrets they didn't want revealed now long forgotten.