I think you are right about Harry being at the odds with Draco. He'd probably rather hang out with Theo or Blaise if they accepted him at all (which I think they would; Blaise would probably be ordered to be courteous to Harry but not too friendly in order to maintain his neutrality). Although I think the older Slytherins would be constantly testing Harry to see just what he was made of and they wouldn't be too happy about Harry hanging out with the 'outcasts' and would try to mentor him a bit. Especially after finding out his gift for Quidditch.

Lena/Gryffindor/1