A/N: Thank you to my reviewers ShadowXMoonlight, shaymars, Grovek26, just. (Haha, thank you!), 8thWonderOfTheWorldz, wolffriendinus, the person on the Guest account(Haha, your review was certainly very fun to read. Thank you! I'm glad you like the story so much!), pey is your biggest fan(I won't ever stop writing, but I think the story might have to end sooner or later, sorry! But thank you for your lovely review!), Lovepixie19(I always feel nervous when I update a chapter that makes a big change to the main relationship, but I'm glad you think that I'm a good enough writer to pull it off, it really means a lot), Belieber Twihard, JazmanianDevil(Haha, thank you! Yeah, sorry about that!), daniiibabiii, AnAbundanceOfLevi(Sort of, you'll have to wait and see) and crazychick-1027! Also, sorry of the previous chapter upset any of you.

Enjoy! hsx

CHAPTER 21-

After leaving Ginny and Blaise, I ran to the library. I was told off by countless professors, but carried on running, tears blurring my eyes. I ran straight up to the front desk when I arrived, making Madame Pince jump. 'Isobel? What's wrong?' I had been the only student that the sour librarian had ever liked, and she quickly stood up, putting an arm around my shoulders. I told her exactly what happened and she shook her head. 'And you think Miss Parkinson did this to him?'

'It can't just be her. She's not clever enough to be able to charm a bludger into giving someone selective amnesia. Someone would have to be involved.'

'You're quite certain that it's her?'

I nodded profusely. 'She's been at me since I found out who I really was. Then there was that night in the broom cupboard with… Ron! He must have helped her! Wait, he wouldn't be able to do that charm either…' I shook my head, deciding that I would interrogate him later. 'How many books do you have on memory?' Madame Pince consulted her parchment and she frowned.

'We have none in. They've all been taken out, sorry. Didn't you get some for your potions project on memory?'

'I only have one. That'll have to do. Thanks for your help.' I ran out the library and up to Gryffindor Tower, Ginny stood in the common room with Harry and Neville.

'We heard what happened, Isobel. We're sorry.' I rolled my eyes at Harry.

'It's all well and good saying sorry, Harry, but that's not going to bring Draco's memory back.' I made to walk to the stairs up to my dormitory, but Neville spoke up.

'Why don't you go and see McGonagall?'

'Because talking to McGonagall isn't going to bring Draco's memory back, or keep Parkinson away from him. If I spoke to the bloody Minister of Magic it wouldn't help.' I ran up the stairs, hearing someone come after me.

'Isobel! We need to talk to McGonagall.' I turned to Ginny halfway up the stairs, eyes narrowed.

'You go and talk to her. I'm getting my potions book then I'm going to see Slughorn.'

'Why Slughorn?' She asked as I continued up the stairs.

'Because he's good with pensives! Are you coming or not?'

'I'm sorry, Miss Zabini, but unless it were serious circumstances, you would not be allowed to show Mr Malfoy your memories. It can be extremely dangerous. If you say it was a charm on the bludger, why don't you go and talk to Professor Flitwick?' I sighed and nodded.

'Okay, thanks, Professor.' It was getting late, and we had found Slughorn in his office rather than his classroom.

'Are we going to see Flitwick then?'

'Of course we are, Gin.'

'But I'm tired.' Her voice was strained and I just shook my head.

'Then go to bed, I'm not making you stay.'

'No, I'm staying. If I don't you might do something drastic.' I looked at her strangely halfway down the corridor.

'Like what?'

She shrugged. 'Kidnap Draco.'

'You honestly think that?' She shrugged again and I huffed. 'I won't, I promise. Now, are you going to bed?' She shook her head and we carried on walking through Hogwarts to Professor Flitwick's office, which he was just leaving. 'Professor!'

'Ah, Miss Zabini, Miss Weasley, what can help you with?' I quickly explained the problem and he went back into his office, both of us following. 'I think I know the charm that you're talking about. It's very hard to cast, and between you and me, neither Miss Parkinson nor Mr Weasley would have had the magical ability to cast it successfully.' The small professor hummed as he squinted behind his glasses, looking up at the top shelf of books. 'That one, I think. Wingardium Leviosa.' He levitated down a heavy book and handed it me. Turn to page fifty seven.' I did as he asked, and he smiled. 'Yes, that's the charm that's been used. Oblitus selectionis.'

'How does the charm work, Professor?'

'The caster must have in their mind what exactly they want to eliminate from the person's memories, or any adjustments they want to make. In your case, someone substituted your recent position in Mr Malfoy's life for Miss Parkinson. It would take a lot of concentration, as well as months of planning. They would have also have to have had Mr Malfoy in their sight as they cast it.'

'So they were sat watching the quidditch or practicing then?' I asked, hope rising.

'Possibly. They could have been anywhere though. Perhaps the forbidden forest, from a window in the castle. As long as they could see him, they would be able to cast the spell.' I sighed, my shoulders slumping forwards.

'Well, I can just cast the counter charm on Draco.'

'I'm afraid not, Miss Zabini. The charm can only be countered by the one who cast the original spell.' Ginny ground her teeth together behind me, resting one hand on my shoulder comfortingly.

'Are you sure that there's no way around it at all?'

'I'm quite sure. I'm sorry that I cannot be of any more assistance, Miss Zabini.'

'It's alright, Professor. Can I borrow this book for a while?' He nodded and Ginny and I began the ascent back up to our dormitories. 'What am I going to do?'

'Short of getting an alibi from everyone in the castle for this afternoon, you can't do anything.'

'Then that's what I'll start doing, first thing in the morning. Do you think that maybe one of the escaped death eaters could have done this to him?' Ginny shook her head.

'The wards are too strong for them, they wouldn't be able to penetrate them with a memory charm. Come on, you can think about this in the morning. We both need some sleep.'

The next morning, I got dressed and grabbed Professor Flitwick's book before heading down to the Great Hall with the others. As the other eighth and seventh years sat down, I went over to the Slytherin table to try and find Blaise. He was sat next to Daphne and Adrian, Draco and Pansy opposite them who were practically eating each other's faces. I turned away in both disgust and heart break, and tapped my brother on the shoulder.

'Hi, Isobel.'

'Look at this.' I handed him the book, open on page fifty seven and he scanned it briefly.

'What is it?' He asked.

'It's about the memory charm that was cast on Draco.' At the mention of his name, he looked over at me.

'Memory charm?' His eyebrows were raised and he was smirking at me. 'Blaise, tell your sister that I would never have dated her. I would never fuck a Gryffindor, especially not one that used to be a mudblood.' Pansy was grinning beside him, arms wound tightly around his neck.

'Draco, pleas-'

'You're acting erratically, Zabini. And stop calling me by my first name; it's bloody creepy.' Draco addressed Blaise now. 'Tell your supposed twin sister to leave me alone.'

'Yeah, or he'll never speak to you again.' Pansy pursed her lips, and instead of Draco disagreeing which he normally would have done, he smiled.

'Right.' He looked of Pansy with adoration, and it took all of the willpower I possessed not to scream. 'Do you want to go to my dormitory?' Pansy smirked at me then nodded, and they quickly left the hall. I turned to Blaise desperately, but he just handed me my book back.

'Go away, Isobel.'

'What?!'

'I'm not having you be the reason that my best friend no longer wants to know me.'

'Are you blind, Blaise?! He's barely recognisable!' My brother stood up from the bench and faced me properly.

'Did you consider that maybe you changed him beyond recognition? Did you consider that maybe he liked stepping out of line? Did you consider that I maybe liked my best friend before you got in the way?' Everyone in the Great Hall were now watching, and I held up a hand, trying to get him to lower his voice.

'Blaise…'

'Don't. I've pretty much lost my best friend because of you.'

'I can't help who I fall for, Blaise.' He looked away from me. 'We'll get through this together. I'm your twin sist-'

'Don't bother with the connectivity crap. I've known you for practically five minutes. As far as I'm concerned, you're not my sister.'

Blaise turned on his heel and swiftly left the Great Hall, leaving me with a reeling head and staring at the space where he had been stood. I felt someone's hand on my shoulder, looking up to see Daphne and Ginny, both heavily concerned. 'Come on, let's go to the room of requirement or something.'

A/N: Oblitus selectionis is selective forget in Latin. I tried translating selective memory first, but the came out as selectionis memoriae and I didn't like it very much.

Sorry if this chapter was too short for your liking, I started university yesterday so things were a bit hectic.

hsx