Thanks guys! Sorry I haven't been posting, I've had exams and everything!

A loud hissing suddenly filled the rom, along with acid-green smoke. Covering her mouth with her robe, Secret looked over to see Neville Longbottom's cauldron was a melted twist, and was currently seeping all over the dungeon floor, burning holes in people's shoes. Secret gave a squeal and pulled her trainers up off the floor.
'Idiot boy!' snarled Snape. 'I suppose you added the porcupine quills before taking it off the fire?'
Neville whimpered from the floor as boils erupted on his face.
'Take him to the hospital wing.' Snape shot at Seamus.
He then rounded on Harry. Secret had never seen her father like this. The bell rang over their heads, and instead of waiting behind like she would normally do, she fled the dungeons. She was hurt, and shocked. She skipped lunch and just went to sit in the common room, staring into the fire. This wasn't the Snape she knew. This cold, hurtful Snape was nothing like the warm, caring Snape she knew to be her dad. She didn't know how long she spent staring into the flames as they danced in the grate. Before too long, she begrudging made her way down to dinner. He stomach growled at her, annoyed it hadn't had anything to eat since this morning. Entering the Main Hall, she worked her way to her seat and toyed with her shepherds pie.
'You okay?' asked a red haired third-year.
'Yeah, you look upset.' said his twin.
'I'm fine.' she said.
'Don't think we've been introduced. I'm Fred Weasley.' said one, shaking her hand.
'And I'm George Weasley.' said his twin, also shaking her hand.
'Nice to meet you. I'm Secret Snape.' she said, smiling.
'Snape? No wonder you were upset.' said Fred.
'Yeah, having Snape as a father is enough to make anyone cry.' chipped in George.
'Ha Ha, that's not why I'm upset. And I'm not upset!' she insisted.
'Yeah yeah, whatever you say. Wanna come set off dung-bombs in the corridor to annoy Filch?' asked Fred. 'Or does the little first year not want to get in trouble?'
'Oh shut, let's go do it!' Secret said.
Fred smiled and took hold of her hand, and they raced off to the corridor.
'Wait for it. Here comes Filch.' said George, holding a handful of Dung-Bombs.
'Al you do is throw them, and then run.' said Fred under his breath.
'Now!' whispered George.
All three chucked the things, then ran as a loud bang was heard and a horrible oder filled the corridor.
'Weasley!' yelled Filch.
'I take it since he automatically accuses you, this isn't the first time you've caused mayhem?' asked Secret.
'What ever gave you that impression?' replied George innocently.
The turned a corner and crashed into none other than Snape. Filch came panting round the corner.
'You two Weasleys are the bane of my life! And now you're staring to lead the first-year's astray!' he raved, noticing Secret.
'We could be here a while.' muttered Fred.
'I tell you...'
After ranting on for about an hour, he gave all three detentions.
'Bat Droppings.' muttered Secret.
'Mr and Mr Weasley back to your common rooms. Miss Snape, come with me.' said Snape in a low voice.
'Now I'm for it. See you guys!' Secret called to the twins.
'See ya Secret!'
She followed her father all the way to his office, where she sat on the chair the opposite side of his desk.
'Right, what are you gonna do to me? Make me scrub out the caldrons? Sort the store cubored?' she asked.
'Nothing. I wanted to talk to you. You didn't stay behind after potions.' said Snape, resuming his softer voice.
'I was hungry.'
'Professor McGonagall reported that you didn't turn up at lunch.'
'I got there and thought that I wasn't that hungry.'
'Then why didn't you come back?'
Secret was silent at this point.
'Secret?' Snape persisted.
'I-I-I had homework.' she lied.
'You could of still come. I would of helped.' Snape replied. 'But that's not it.'
He got up and swept round, kneeling down on one knee, so he was level with her.
'What's really up?'
'Nothing.' she replied stubbornly.
'Secret...'
'I'm fine!'
He sighed, and stood up.
'I can't make you talk. Well, I can, but I'm not going to use Veritasium on my own child. You may go. And stay away from those twins!' he said, sitting back behind his desk.
Secret left the dungeons, heading back to the common room.
'Secret!'
She looked to see the twins.
'What did he do to you?' asked George.
'Told me to stay away from you two.'
Oh.' said Fred, his face falling. 'Are you?'
'Like hell!' she replied.
They grinned, and talked about what to do next.
'Well we were thinking about going to Hogsmead tomorrow.' said Fred. 'Wanna join us?'
'But I'm not allowed.' said Secret. 'And I don't think there's a trip tomorrow.'
'No there isn't.' said George. 'But we know another way.'

Next day, they were creeping along a dark passage.
'Have you ever done this before?' Secret asked.
'No, this is our first time. You mist be leading us astray.' said Fred seriously, then saw Secret's face by his wand light. 'Joking, we've done it countless times.'
They reached the trap door, and gently pushed it up.
'Are you sure you can cast the charm?' asked Fred.
'Yes, I've done it before.' said Secret.
She reached up and tapped Fred on the head with her wand. He gave a shudder, and disappeared.
'Bloody hell. That's one powerful charm.' said George, looking at the spot where his brother had been moments ago.
'Why, am I invisible?' asked the voice of Fred.
'Yeah, totally!'
'Okay, Secret, I'm going to hold your hand. Cast the charm on George. Then George, hold Secret's arm as she casts it on herself. The take hold of her hand, so we don't get lost.'
She cast it on George, then felt a pressure on her arm as she cast it herself. The pressure moved down to her hand and they all made their way up to the shop.
'This is totally weird.' whispered Fred.
They emerged in Honeydukes, and held themselves to sweets, then made their way to Zonko's.
'Awesome.' whispered Secret, as they entered.
'They loaded up on dung-bombs, and other things, and soon were back in the tunnel, heading back to school.
'Where's everyone?' asked George, once they were back behind the statue.
'I dunno. Let me check.' said Fred, pulling some parchment out. 'I solemnly swear that I am up to no good.'
He tapped the parchment with his wand, and ink began to spread, as if an invisible hand were writing on it. Before Secret could read the front, Fred had whipped it open.
'All clear.' he muttered.
They slipped out from behind the statue, and headed back to the common room.
'What's that?' asked Secret.
'The Marauder's Map.' said Fred, showing her it.
She looked at it, and was amazed.
'I can see father moving!' she said.
'Indeed.' said George, as Fred folded it up and placed it back in his pocket.
'Caput Draconis' Said Secret to the Fat Lady.
She swung forward and they clambered into the common room.
'Secret!' said Hermione, rushing over. 'Professor Snape was looking for you.'
'Was he?!' exclaimed Secret. 'Oh sugar, I better go find him!'
She emerged out the Portrait hole again and raced down the halls.
'No running in the corridors!' ranted Filch as she shot past.
'Oh shut up, you mad old trout!'
'You what!' he yelled.
She was hurrying down the stairs by this time, and bumped into Snape.
'Woah!' he said, catching her before she went flying backwards.
'Heard you were looking for me.' said Secret.
'I was. Where were you today?' asked Snape.
'Library.' said Secret.
'I looked there.'
'Oh god, think of something quick...' she thought.
'I was in the kitchens!' she said.
'Oh brilliant Secret, well done... shut up brain, you haven't interrupted so far so don't start now.'
'Were you now?' asked Snape.
'Yeah.' she said.
'And you know that students are not allowed into the kitchens?' asked Snape.
'Well no one told me that.' she replied.
'Be off with you.' said Snape.
She raced back to the common room, relieved.