Author's note: This story seems to be a bit unfinished, but I actually never meant for it to be… and there's no much sense in it either, hehe… It's just that if I haven't written it down and placed here, I guess, it would have been pretty easy to tell what my best friend's nightmare would be about… :)

WATCH OUT, BLACK!

For Kate

A tall and definitely very strict teacher was walking between the student's desks, checking their homework. Every single time he was passing by a child, he considered to be absolutely ignorant of his subject, he stretched out his neck, that was already long enough, trying to find all the possible mistakes in his or her essay, even if there were none.

At such moments he looked pretty much like a giraffe in a safari park eager to reach for something in the visitor's car… but no one dared laughing at professor Rainy – you could have considered yourself to be lucky if you only got a detention after that…

However, there still were students who made professor lose his temper without even committing anything that was 'out of order' in that bloody classroom. And Melody Morgan was one of them.

She was a cheerful girl with straight shoulder-length auburn hair and sparkling dark-brown eyes that you might have considered to be black even if were standing just beside her. There was something special about her eyes… at least, everyone thought there was… no matter what happened, they continued smiling… but unfortunately at lessons (especially if it was Arithmancy) you weren't given any points for how amazing your eyes were…

Suddenly somebody tapped her on the shoulder and Melody turned around to see professor Rainy there.

'Well… well… well, Ms. Morgan! Homework's not done again,' his eyes furiously flashed.

'I'm sorry, professor,' weakly babbled the girl. 'I haven't understood the topic well enough.'

No wonder, her words didn't sound surprising or unique to professor – almost every student was explaining his undone homework like that, although Melody wasn't lying…

'You've always been a perfect student, Ms. Morgan, I'm disappointed,' professor Rainy drifted away in the direction of his desk. 'Ten points will be taken from Slytherin!'

Someone laughed behind her. Melody turned to look. Well, of course, who else could that be? James Potter, Peter Pettigrew, Remus Lupin and Sirius Black… Black… yes, he was really handsome, she had to admit that, but not more… Melody rolled her eyes and turned away.

The bell rang.

'For homework… read three next chapters and write an essay on them,' professor Rainy sniffed scornfully. 'Those who have failed to do their task for today are to finish it by the next lesson as well.'

Melody shook her head: everything was getting from bad to worse… especially for her, for a Slytherin prefect. She looked up at her twin-sister, a Gryffindor.

'Hey, what's up with you, Mel?' a girl, who seemed to be Melody's pure reflection, headed in her direction.

'Nothing,' answered Melody, putting a great stack of parchment away.

'You've never failed to understand that stuff before…'

'Look, do you care?' said Melody sharply. 'So I did this time. Is there something else, Donnie?'

'Well, yeah,' her sister turned pink. 'Have I told you I'm going out with Black tomorrow?'

'With Sirius Black?' Melody blinked.

Donnie nodded.

'But… he's such an idiot?!'

Donnie's eyes flashed with anger.

'How can you say so? He's…'

'One of the coolest guys in Hogwarts and at least half of the girls at school are going crazy about his good looks,' finished for her Melody. 'You've never got a feeling it may be sometimes stupid - mixing up with the crowd of stupid fans, have you?'

'You're just jealous,' Donnie yelled, 'I won't be surprised if it appears that you're fancying that moody Snape…'

'Whom?' Melody was surprised so much she had nothing else to say. 'Stop embarrassing yourself! We're just friends…'

She continued, already in whisper:

'And, for Merlin's sake, stop yelling!'

However, she doubted that her twin had heard her – Black presented Donnie with such a friendly look…

'So… see you tomorrow,' finally said Donnie, turned on her heel and hurried away.

'Wait, what do you mean – tomorrow? Aren't you going to the music class tonight?'

But her sister didn't answer her.

'So, Black charmed your little Madonna as well?' muttered Severus Snape darkly behind her back.

'Don't call her Madonna,' Melody furiously nodded. 'She hates her full name.'

'And you're just gonna watch them?' Snape calmly gazed at his Slytherin friend.

'Do I have a choice?' Melody grinned. 'Is there actually any chance for a filthy Slytherin to convince her noble sister, who's in fact a Gryffindor, that Black is a…'

'Don't,' Severus laughed. 'You don't know enough swear words.'

Melody smiled.

'Anyway… You'll help me with that Arithmancy, won't you?'

'Sure,' said Severus, as they left the classroom and went to Hogwarts grounds. 'What are you thinking of?'

'I'm thinking… I'm thinking about Donnie and Black,' answered Melody furiously eyeing her sister, who was talking to Potter and Lupin by an oak. 'I must stop her, right?'

'If you're asking me, than – yes,' Severus beamed.

'Well, I'll think about it…'

They sat down under a small bush.

'So… Arithmancy,' Snape opened their textbook on the first page. 'The most important thing you've got to understand is…'

He continued for about ten minutes, but Melody didn't listen. If there was something important than it was her sister dating Sirius Black, and miss Morgan didn't like the way her sister trusted that guy.

She had to stop Donnie from making that mistake. She had to make her move. But when?

(In the meantime)

'Hey, Donnie,' Black greeted the girl. 'What's that you're talking about, ha?'

Donnie turned red; Lupin rolled his eyes and slowly walked away in the shadow; James presented Melody's sister with a significant look and joined Remus and Peter.

'So, what were you talking about with James and Lupin?' Sirius smiled cheerfully.

'Oh, well…' said Donnie excitedly. 'We've been talking about tomorrow…'

'About tomorrow?' Sirius sounded surprised. 'With James?'

'Yeah.'

'You didn't change your mind, did you?' Black didn't look afraid though. 'Well?'

'No, of coarse, I didn't!'

'Well, I'll be really looking forward to…'

He leaned over her…

Now! That was it! Melody stood up, leaving Severus in surprise, and ran to them. She hoped she'll be in time and Black won't manage to kiss Donnie.

'Black, get away from my sister,' Melody suddenly felt strange fury boiling inside her. 'And move away before I hex you!'

'Mel? What are you doing?' shrieked Donnie.

'Shut up, Donnie,' - Melody looked into Sirius's eyes; he seemed to be shocked by something. 'How dare you Black playing tricks with my sister? You know perfectly well, just as well as I do, that tomorrow you'll go out with Donnie and the day after tomorrow you'll be kissing Molly from Ravenclaw!'

'What?' – Black still couldn't understand what was happening.

'Go to your tower, Donnie,' Melody was surprised – her twin didn't object.

'Hey, Donnie! Wait, where are you going?' Black hesitated for a moment. 'Get away from us, will you? Go to your dear precious Snivelly, you hear m…'

'Impedimenta!' Melody took out her wand before Black'd finished his sentence.

The spell knocked Sirius off his feet and Melody looked around to see where his friends were, however they must have entered the castle so that they wont hinder Black and his girl friend.

Black was still to lying on the ground, breathing heavily. Melody moved closer to him with her wand raised.

'I think I've made myself clear,' she said, already feeling responsible.

'Inescapably clear,' muttered Black with an odd grin on his face.

Melody turned on her heel and headed towards the bush, under which Snape was sitting. She knew that if Black wanted to get his revenge, she would have been already moaning in the Hospital Wing, however he didn't even take out his wand, didn't even swear…

She sat down next to Severus again. Strange, now she felt guilty.