Vampire in Gryffindor Clothing

Akasha looked up from where she lay and smiled lazily. “Hello, Sirius,” she drawled. “Care to join us”
He knew he shouldn’t care. He should just let her go. She was a monster. But he couldn’t help himself. Sirius pounced.
Snape yelped and tried to scramble away, but Sirius was just too fast. His fist collided with the his enemy’s nose.
“Ow! My nose! I bink ib’s broken!” Snape cried, blood streaming down his face.
Sirius hit him again, this time in the stomach. “You’d think you’d learn from the first thousand times I’ve kicked your ass,” he roared. “But no. You just have to step into my territory. Well, this time you’ve too far”
Akasha rushed forward and pulled Sirius away from a fallen Snape. “Sirius! Please, stop!” she said, shocked. Her face was stricken, lower lip trembling.
He couldn’t look at her. He couldn’t believe what he had just done. He truly believed if she hadn’t stopped him, he would have killed Snape. No matter what, Akasha belonged with him, not with that freak Snivellus.
God help him. He was in love with a beast.
He had no choice but to crush this triangle right here and now. He pushed Akasha away and stood. His words were meant for Snape. “I never figured you for a half-breed lover, Snivellus. Or did you not know our fair Akasha here’s a blood-sucking vampire”
Snape stopped crying and looked up. “What do you bean?” he said thickly. He looked at Akasha. “Ankasha? No... You...?” He scrambled up, his eyes pleading.
Akasha resigned herself to fate. Her lips skinned back from her teeth and she bared her fangs in shame.
“You’re a filthy half-breed?! By God!” Snape looked like he was going to be sick. “You- you just stay away from be, you freak!” And, still holding his broken nose, he shoved past her and out of sight.
Akasha turned to Sirius, heart shattering into a million pieces. Tears welled up in her eyes. “Oh, Sirius,” she said hoarsely, voice pained. “You have no idea what you have done”
A few tears ran down her cheeks as she said this. It made Sirius ashamed of himself. She hadn’t really deserved that. And now he’d ruined her life.
“I...” He found he couldn’t go on. There was nothing he could say to fix this. If she killed him now, he’d let her. He deserved it.
But all she did was bow her head sadly, looking diminished. “I only wanted to protect you,” she whispered.
Sirius closed his eyes in realization. “Oh, God”
“And now you’ve killed me”
In shock, his eyes snapped open. But she was gone. And he was alone, left to wallow in his shame and guilt. Akasha wasn’t the monster.
He was.

There was a commotion going on outside of DADA. Some sort of fight. As Sirius turned the corner to the class, he heard chants, voices filled with savagery and hatred. Things like: “BITCH!” and “FILTHY HALF-BREED!” and “GET HER”
Sirius dropped his books and ran toward the mob, his heart pounding erratically in fear. God, no. Oh, God, please, no! he pleaded, knowing it was no use.
Several people in the crowd were taking turns to kick out at a bloodied figure on the ground. A girl curled up into a tiny ball.
“You don’t belong her, half-breed!” someone yelled. “We’ll show you what we do to beasts like you”
Another person threw a book at the huddled girl. It hit her in the head with a loud thud.
Akasha’s head whipped up to stare at the crowd, eyes blazing lie green fire. It seemed as if she was trying to memorize every face that was there. She hissed, fangs bared. People began to pull out their wands, faces twisted in disgust and prejudice.
“I never did anything to you,” she growled. “You don’t even know me”
“We know what you are. That’s all we need. Your kind are monsters. Nothing more”
Professor Blackthorn looked on from the doorway of his classroom, a slight smirk on his face. The students advanced again and began to beat the fallen vampiress.
Akasha groaned, clutching her broken arm.
“GET AWAY FROM HER!!” Sirius roared, throwing himself between the mob and Akasha. “SHE IS NOT WHO YOU THINK SHE IS!! Akasha is not a monster. She’s been trying to fight her nature. AND THIS IS HOW YOU TREAT HER?!?!” He pulled out his wand. “I swear, if any of you ever touch her again, I’LL KILL YOU ALL”
James and Lupin stepped forward to help Sirius.
“Get her to the hospital wing,” James said in understanding. “We’ll keep this crowd under control”
Lupin added, “Peter’s getting Dumbledore right now. He’ll take care of this”
Sirius put his wand away and gathered Akasha up into his arms. She was barely holding on to consciousness.
“I didn’t do anything wrong,” she murmured. “I just wanted a normal life”
“I know,” he said hoarsely, racked with guilt. “I know, baby”
She groaned in pain and rested her head against his chest.
“Come on,” he murmured. “Let’s get you out of here”
While James and Lupin kept the crowd at bay, he ran to the hospital, Akasha cradled in his arms.
“Madame Pomfrey!” he yelled urgently. “Madame Pomfrey!! Akasha’s hurt”
He was reluctant to let her go, but she needed the nurse’s help, and he was in the way. After Madame Pomfrey was done bustling over Akasha and applying necessary potions to heal her, Sirius sat beside Akasha’s bed, his hand interlocked with hers. She was still unconscious.
It was all his fault she’d gotten hurt. And now, here she was lying in this hospital bad, cuts and bruises all over her body, broken arm and swollen jaw. This is all my fault.
He pressed her hand to his cheek. It was so cold. “Oh, Akasha,” he whispered shamefully. “I never meant for this to happen. But I swear, I won’t let anyone hurt you ever again. I’d die to keep you safe.” He wanted to tell her he loved her, but he didn’t deserve to get that off his chest. He should be the one in the hospital bed. Not her.
And she looked so helpless lying there. Like a porcelain doll. Or a marionette that’s had it’s strings cut.
He looked up at her face to find she was awake.
“Akasha”
She pulled her hand from his. Her face was icy and full of hatred. “Get out,” she spat. “Don’t ever come near me again. I hate you”
Sirius flinched visibly at her words, but he nodded. This was her choice. He couldn’t deny he wish, not after all he’d done to her, all the pain he’d caused her.
“I’m sorry,” was all he could say as he pushed himself tiredly out of his chair. “I won’t come near you again”
She turned her back to him, and he had no choice but to leave.