(Ugh have fun with that ;) Ooo that's good though!
It would be difficult to decide a house that suited them both xD I mean John def isn't a Slytherin. I think the whole house rivalry thing is interesting, cause they'll be best friends even though that and stuff
It'll be cute no matter what though :3)

Sherlock had stood up and stretched in quite a cat like manner, giving a slight young. He was a bit tired and actually quite glad to be there, looking forward to just going to bed. He hadn't slept in nights so that would be fun. And he was going with John. He hoped they were in the same house. It wasn't likely, but it would really be cool. Then he would get to spend loads of time with John. He was really looking forward to that. Sherlock was quick to follow John out of the compartment, giving him a warm smile as a kind of reassurance. He wasn't exactly sure what to say. After all Sherlock had grown up around magic, he already knew how to cast the basic spells and everything. He didn't know what it was like for John who had been brought up a muggle.
He was right behind John as the left the actual train, practically invading his personal space. Not that that was something Sherlock knew existed. "I think we need to go over there," he pointed to were all the younger pupils were being gathered by a teacher. He assumed they were first years as they all looked like they didn't know what they were doing.