Disclaimer: I do not own Harry Potter, it all belongs to J.K Rowling. Even Sirius...

*insert hysterical crying here*

Let Your OCs Run Free Challenge at the Hogwarts Houses Forum:

Plot: Your OC just got the Dark Mark. Prompts:

12. (Word) charming

5. (Creature) Thestral

9. (Word) exhilarating

10. (Word) infinite

Greek Mythology Mega Prompt:

Themis – The titan of justice and order. She was the mother of the Seasons. Write about a character who is in the books but not the films. Alt; write about an O.C.

The Quidditch Pitch at the Hogwarts Houses Forum:

Prompt, Character: Sirius Black

The Drabble Club at the Hogwarts Houses Forum:

Prompt, Creature: Thestral

Word Count: 1243

"This is the new recruit, eh?"

Antonin Dolohov's deep voice rang throughout the dimly lit room, drawing the attention of all the other Death Eaters to the two hooded figures standing stiffly near the door. "Hmm. Not bad. Not bad at all, but nothing special either," he continued.

Gray eyes turned and gave him a scathing look. Antonin flinched and took a step back, bowing his head the slightest bit. "Apologies Lucius, I did not realize it was you."

The cloaked figure laughed coldly. There was something off though, this voice was too feminine to belong to Lucius Malfoy. The figure raised a pale, unblemished hand. With a smooth, overly-dramatic stroke, the hood was off.

Long, silky locks of blonde hair tumbled down the woman's back like a stream of liquid gold, blending in perfectly with her pearl white cloak. Sharp, gray eyes stared at Antonin with a mixture of contempt and amusement.

"Antonin. Can't say I fancy seeing you here, although, I did expect as much," the woman purred, flashing an icy smile.

Antonin scowled. "Anything's better than being trapped in that bloody excuse of a school."

"Actually, I learned quite a lot in that school, for example the combination of hexes and jinxes that will do the most harm. Would you like to see?"

The hooded man beside the woman finally spoke, "Come, sister, the Dark Lord awaits."

The woman nodded and followed the cloaked man out of the room, leaving Antonin standing there, a spiteful remark frozen on the tip of his tongue.

~OoO~

"So, this is the legendary siren of Slytherin," the Dark Lord mused, his soulless eyes staring at the female Malfoy.

"Rise child. Rise and tell me your name."

The woman stood up, and her gaze was confident as she met the Dark Lord's. "Rhea, my lord."

Voldemort nodded his head in approval. "Well, Rhea, your brother Lucius speaks highly of you. He says you will be willing to join my cause. What are your thoughts?"

Rhea bowed before replying. "It's time the world is rid of those with unworthy blood. I am honoured to join your cause."

The Dark Lord smiled.

~OoO~

Rhea gazed at the Thestrals grazing calmly before her, a bitter mix of envy and longing in her eyes. She'd been able to see them since her third year, after witnessing her brother and his girlfriend murder a muggleborn— no, mudblood.

A young baby Thestral strayed from the herd. It trotted toward her, milky eyes stared hopefully into gray ones, asking for a treat or maybe a quick pat or two.

When Rhea remained still, the Thestral neighed impatiently and nudged her hand. Rhea spared the little filly a glance. It was cute, in a slightly disturbing way.

Rhea stroked the filly's head, her hard eyes softened and a small smile graced her lips. She knelt down beside the small creature, taking its face into her hands.

"You know, if I had the choice," Rhea began in a soft whisper, "I would choose never to be able to see you. It's nothing against you, you're a cute little thing. It's just all the things you represent. Do you know that only the ones who have been graced with death's presence can see you? My brother's girlfriend, or ex-girlfriend I guess, said that killing people was fun, a hobby, and a sport. She said that your first kill is always the most exhilarating. It isn't. None of the kills are exhilarating. Each and every time I end a life, I feel sick. Do you understand?"

Rhea's eyes locked with the young Thestral's. Its' blank, milky gaze stared back at her. Rhea smiled sadly. "Of course you do."

The Thestral suddenly gave a frightened squeak. It shook itself out of Rhea's grasp and raced back to its herd. Rhea turned sharply, her wand already in hand.

"Merlin! You scared me. I thought you were one of those Death Eaters. You've got to stop wearing those cloaks, Rhea."

Rhea stood up and returned her wand. She eyed her cloak. Raising an eyebrow, she turned to stare at Sirius. "I look rather nice in them though, don't I?"

Sirius smiled softly. "You look nice in everything, love. Although, being honest, I think I preferred that white one of yours, at least it didn't make you look like a Death Eater."

The irony of the whole situation finally caught up to her, Rhea couldn't resist it anymore and, finally, she allowed a grin to slip through her tough exterior.

"Aww, my little Re-Re looks so cute when she smiles," Sirius cooed playfully, opening his arms wide for an embrace.

Rhea happily melted into his arms, enjoying the feeling of warmth and comfort. They stood there, both unwilling to let go, until finally, Sirius spoke.

"There's an empty house up for sale at Godric's Hollow. It's right across from the Potters'. It's big enough for us, and maybe a few little ones if you're up for it." Sirius wiggled his eyebrows suggestively.

Rhea rolled her eyes, of course Sirius would end such a romantic gesture with a joke like that. She met his gaze, only to realize he was still waiting expectantly for her answer.

"How charming, Sirius. I'd love to," Rhea murmured lovingly.

Sirius grinned. "Come on then! What are you waiting for?"

Rhea's eyes widened. "What? What do you mean? Where are we going?"

"Why, to the Potters', of course! We've been invited over for dinner."

Sirius yanked Rhea towards his flying motorcycle. The movement caused her robes sleeve to fly up. Suddenly, Sirius stopped.

"Rhea," Sirius whispered, his voice deathly quiet. "What is that on your arm?"

Rhea yanked her hand out of her lover's grasp. "It's exactly what you think it is," she confessed quietly.

A tense silence covered the forest like a thick fog. The Thestrals had long since vanished, scared away by the man with the flying motorcycle.

"Why?" Sirius croaked, his voice broken and hurt.

No matter how much pain and heartbreak Sirius was in right now, Rhea knew what she felt was worse. "There are infinite reasons," was her only reply.

Sirius took a trembling step back. Rhea watched him, countless emotions swirled in her eyes. Sirius leapt onto his bike and started the engine. He spared Rhea one last look before flying away.

~OoO~

"Rhea, I'm glad you've finally decided to join me. I've been waiting," Dumbledore said, his blue eyes twinkled in the dim light.

"How charming," Rhea answered dryly, sitting down on the seat opposite of the Headmaster.

Dumbledore smiled kindly at the young woman.

Rhea sighed heavily. "Let's just get this over with," she muttered. "The Dark Lord— err, sorry, force of habit. He-Who-Must-Not-Be-Named sent Bellatrix and Regulus to kill some muggles. Regulus seems to be rethinking his decision to join. Bellatrix is still as insane as ever, maybe more. My brother and I have gotten into He-Who-Must-Not-Be-Named's inner circle and all the other Death Eaters have not made any unusual movements."

Dumbledore nodded thoughtfully. "Yes, wonderful. Thank you, Rhea."

Rhea nodded and stood up. She was just about out the door when Dumbledore spoke. "Remember Rhea, you must not tell anybody. No matter what, it must remain a secret whose side you're truly on."

Rhea nodded grimly. "I won't tell anybody."

Dumbledore raised an eyebrow. "Even Sirius?"

"Even Sirius." Rhea confirmed, closing the door behind her.

A sigh escaped the white-bearded man. "It's for the greater good."

I hope you enjoyed it. Please kindly leave a review! Also, would anybody be interested in a multi chapter about Rhea and her life at Hogwarts?