@RJ:
I'd love to write Ana/Cesca! They would certainly know each other, you're right, but I doubt they'd get along. From what I've read of Ana, I doubt they would. If you're down for it, I think enemies (or at the very least a solid dislike) would be really fun to write.
Max is lovely. So, I have a conundrum for you. Vivianna is an excellent flier, but has basically no interest in quidditch. This is mainly due to the social component, and that she'd much rather spend her time in the dungeons. Surprise, surprise. However, we need more quidditch players for all of the Hogwarts houses, Slytherin included. SO, I need a reason for her to play. At first I thought some of her housemates could blackmail her into it, but that would never work on Viv. (She's far too good for that.) But what if Max saw her flying, and flat out refused to stop nagging her about it until she joined the team? I know she's a Slytherin and he's a 'Claw, but would that be in character for him? If not we can easily think of something else.
Best of luck with your exams!!
@Rina:
Brilliant, thank you!!