Author: My first CCS and HP Crossover. I can't explain the whole story but this is how it happened:
The second movie hasn't happened. It's Harry and co's first year too.
Sakura and co. are now 11. Eriol and the others(Touya, yukito,e,t,c) all got jobs at Hogwarts. Fuuhitaka and Sonomi got married and they live in Sonomi's house.
Eriol had convinced Dumbledore to accept Sakura an co. into Hogwarts. What they don't know is that something strange is going to happen in their first year.
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Disclaimer: I can honestly swear that I do not own any of the characters. So now you can't sue me^.^. All flames will be used to save electric bills.
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CHP 1: Diagon Alley
The CCS Gang arrives in Diagon Alley with a list of their school needs.

"Eriol-San. Vot do ve haff to buy virst?" Sakura queried in poor English.
"Wands and then Books", replied Eriol.
"Demo, I can create vands", said Sakura"And ve don't haff money".
"Sakura, you can't create magic wands. It won't work. There is a heap of money in the bank that we can use. And if we don't have enough, we can always get it off Daidojou." Tomoyo stared at Eriol. "I'm jokimg, I'm joking!" cried Eriol.

They bought all their stuff and then had ice-cream.

" I don't know why we have to buy robes, I can make them for Sakura-Chan if she want." argued Tomoyo.
Eriol suddenly got up, raised his wand and muttered ' Billingual Angalais'.
"Hey! I can speak English properly!" cried Sakura cheerfully.
"I casted a permanent English spell on you guys"exclaimed Eriol.
"Sakura-Chan, let's go home now" Tomoyo said.
"Oh yeah, and Daidojou, don't use Japanese endings here or else people will think you name is 'Tomoyo-Chan Daidojou'", added Eriol.

***

Next morning they went to King's Cross Station.
"How can we get to Platform 9/4?" queried Tomoyo.
"This is how. Stand here and there you go", explained Eriol.
He had just pushed Tomoyo into a wall between Platform 9 and 10 with Sakura following, Syaoran next, followed by Meiling and the others.

The CCS Gang had managed to find a Carriage to themselves while on the train.

To be continued....
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Author: Ok. I know the words are a bit hard to read. That is all of chapter one.
I'll try to post chapter 2 by the end of next week.
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Demo= But
Chan= Used after a best friend's name.
San= Respect for and older person.