This is a Sirius/OC/Snape. Since it's a triangle, I'm not sure what characters to use. This is in no way slash, though. You've been warned.
This is not DH compliant. The entire story was written before the seventh book came out, so it definitely doesn't fit with the Snape/Lily-ness from DH.
Chapter 1 – Big Fat Mouth
"Why hello, Snivelly. How are you and your greasy nose on this lovely day?"
Rhiannon Bishop watched the two boys in disgust. She was the only other person in the hallway, walking round while she read, minding her own business.
"Leave me alone, Black," snapped Snape before trying to walk away.
Black had his wand out in a second, ready for either offense or defense. "Why would I ever do that? Where do you think you're going?"
Rhia snapped her book shut, catching their attention. "Are you two done yet?" she asked innocently. "Some of us are trying to read."
"Shut up, Mudblood," spat Snape.
She looked at him questioningly. "I don't th-think I have to take… orders from you," she mumbled.
"I'm sorry. What was that?" he mocked.
Black cut in. "Don't attack a harmless Ravenclaw."
"Harmless?" said Rhia indignantly, but she put up a feeble defense.
"What gives you the right to tell me what to do, Black? You're just a blood traitor."
"You're not even a pureblood, so how can you speak of such things?"
"Please stop," said Rhia meekly.
Neither boy paid her any mind.
"I'd rather be a half-blood than a blood traitor."
"Well, you're you and I'm me."
"Oh, you make everything all so clear, Black," Snape said sarcastically. "Goodbye." He turned round, his hand securely placed on his wand handle, and walked toward the dungeons.
"You alright?" asked Black, glancing at her.
"No thanks to you," she said quietly.
"Hey, you got in the way."
"And you don't even care who gets in the way. You'd hex them if you felt it necessary."
"Hell, I'd even hex Prongs if I felt it necessary."
"Oh, go away." Rhia quickly plunged headlong into her book, History of Herbs, which she was reading for Advanced Potions class, and continued on her way to the Great Hall.
Her mind, however, was not on the book. She was too frustrated with what had just happened. If there was a fight, she was usually the one diving in to stop it and then climbing out the victim.
It might not have been so bad if she had a friend to talk about everything with, but it was a well-known fact that know-it-all Rhiannon Bishop had no friends. She was too engulfed in her school work or books or writing letters to her aunt and uncle. She didn't really have any acquaintances either. Half the people she met she hated, which included the two boys in question, Sirius Black and Severus Snape.
Black and Snape were always fighting. Black and his best mate James Potter were usually making fun of Snape, and he loathed them for it. They both loathed him just as much. But Black loathed him more.
Thinking this over, Rhia noticed just how much they frustrated her. If the two were fighting, she tried to break it up. Then one of them, if not both, would make fun of her, because she stuttered and she was bossy. She was used to it by now. She barely noticed half the time. But she would always try to defend herself, even if it never worked.
If Potter was involved in the argument, she knew not to interrupt as Lily Evans would usually do so. Evans was always trying to yell at Potter for something. It was rather amusing at times, but usually it was just old.
Once in the Great Hall, Rhia sat down at the Ravenclaw table, still reading her book. She always sat at the end nearest the doors, alone. No one ever sat with her. She was pretty much an outcast—a bossy, know-it-all, stuttering outcast.
Finally setting down her Potions book, she began to eat lunch, which consisted of a glass of pumpkin juice, a beef sandwich, and crackers. She ate quietly and without complaint, glancing around the Great Hall.
She watched Black enter the Hall and then join the other Marauders, immediately telling them of his encounter with Snape and herself. The four boys glanced at her. She glared in turn and returned to her meal, her temper shorter than it previously had been.
Once finished with her meal, she grabbed her book and left the Great Hall, finding her place and continuing to read. Rhia walked silently up the staircase and toward a large bright blue curtain covering the wall. "Gillyweed," she said habitually. The curtain fluttered, and she pushed it aside to enter the Ravenclaw common room.
Rhia curled up in the chair by the hearth and continued to read her book—attempted to read. Her mind was immediately interrupted by the thoughts of the conflict between Black and Snape.
Damn those two boys. She hated them both. Black was a conceited prat that had probably snogged every single girl in their year other than herself or his cousin. And Snape was so dark and conniving, with his smug attitude and hatred toward any Muggle-borns or non-Slytherins. They both disgusted her. She hated them and they hated her. But the worst part was that she could never force herself to stand up to either of them—at least not to the extreme she would have liked. They were so damn frustrating!
And her and her big fat mouth! She could have just walked away—but no! She just had to interrupt them. Sure, she stopped what probably would have been an extremely brutal fight, as it was her duty to do so as Prefect, but she didn't even use her powers to help. She just mumbled and got insulted.
Harmless Ravenclaw?! That prat! So maybe she was harmless, but he didn't have to use it with such an insulting tone. Stupid prat! Stupid prat! Stupid prat!
Stupid, stupid, stupid! Her stupid, big, fat mouth! Why did she have to always embarrass herself like that? Was she destined to be a loser her entire life? How did she deserve such karma? What had she ever done? Rhia was completely innocent, never lifting a finger to do one bad thing. She always played by the rules. She hugged her aunt and uncle every day she could. She got perfect scores on all her tests. And, for all this, what did she have? No friends. People making fun of her. A stuttering problem. And a big fat mouth that got her into social hell. Not to forget that the guy she fancied didn't even know she existed. Social hell!
Damn. Her and her big fat mouth.
Well, thanks for reading this. Please leave me a review.