Dislaimer: I don't own any of it. Still. I know, I wish I did, but I don't.
Poisonous
"Do not. Call me that," said Bellatrix angrily. Her black eyes flashed and Snape got out his wand, preparing to defend himself again.
"You know, Trixa dear, I'd love to stand at the doorway and exchange pleasantries whilst freezing, but I'm afraid my…guest won't allow it." Snape gestured with his wand to the wall behind him while closing the door behind Bellatrix. The wall seemed to disappear, and revealed Wormtail, standing a rickety step, holding a broken phial. The fingers of his left hand were turning a curious shade of yellow. Bellatrix glared up at him, and gave Snape an exasperated look. She drew her wand, pointing it directly at Wormtail's face.
"You sniveling little clod! Get back to your cupboard and stay out of his," she gave Snape's chest a jab with her wand, "things!"
With a stifled squeak, Wormtail ran back upstairs. Bellatrix sauntered over to the threadbare sofa and sat down, removing her heavy black traveling cloak to reveal a simple black dress and black boots. Snape followed suite, still holding his wand out. His visitor was both beautiful and completely insane. He didn't put it past her to Crucio him again for the sheer sadistic fun of it. He sat opposite her, thoroughly confused as to the reason for her not-entire-unwelcome visit.
"So, Trixa," he sneered, keeping his tone light, "I'd imagine your visit has another purpose aside from inflicting pain on me? Or do you often walk around the slums of London, praying on unsuspecting potions masters and using Unforgivable curses at your leisure?"
Bellatrix could have sworn that if she closed her eyes, his voice sounded like velvet. "But orders are orders," she reminded herself and she put her thoughts aside. There would be plenty of time for that soon enough.
"Oh, Sevvy," she jeered. "Working at that place must be turning you soft, hmm?" She placed a cold, pale hand over his, enjoying the fact that his black eyes had widened slightly. "'Using Unforgivable curses at your leisure!'," she mocked. "I remember teaching you those curses. I remember seeing your whole face light up when you first killed. And now? Evidently, Snivelus, working under that Mudblood-lover's wing has turned you into one of them.
Which incidentally, Snape," she said, spitting his name out as if it tasted bad, "is exactly the reason I'm here." Bellatrix removed her hand from his, annoyed that her threats were falling on seemingly deaf ears. Snape got up and went to a cabinet on the wall behind the sofa. Bellatrix's gleaming eyes followed him. Pulling out a dusty bottle of wine and two goblets, he began to speak, his back to her.
"You're here because you doubt my loyalties. Again, I might add. Isn't it evident that I only have Draco's best interests and the Dark Lord's bidding in mind? I know you don't trust me, Bella, even though both the Dark Lord and I have given you ample reason to."
He turned around, watching for a reaction. He could see the question formulate in her mind, knew it was coming before the words left her lips. "And obviously", he said, handing her a goblet and sitting down, "the only reason I have stayed at Hogwarts for so long is because the Dark Lord instructed me to do so. We've had this conversation before, Trixa darling. Now, if there's nothing else", he said softly, "perhaps you'd be willing to take your wand out of my face and have a drink? I didn't poison it, I promise," he said with what, on anyone else, would have been a smile.
Bellatrix put the goblet down on a dusty end table. She put her wand down haltingly, looking at him. "I will if you will," she teased. Snape reached into the pocket of his black robe and laid his wand on the table.
"Very good, Sevvy," she said, a slow smile spreading across her sallow features. Snape watched something snap in her black eyes. She leaned across, almost savagely, ravaging his lips with hers, feeling warm blood trickle slowly down his lips. Still holding onto his lip, she looked into his eyes, two dark tunnels. It was more that he could bear, and she knew it. He grabbed her, pulling her to her feet, and pushed her against the nearest wall. "If Bella wants rough, she'll get rough," he whispered, his eyes glinting dangerously. He reciprocated the kiss. Bella realized that her mission could wait, at least temporarily.