[Hee. She gives him an apologetic look, though can't help from still smiling.]
Sorry. I didn't mean to laugh or anything. [Her eyes soften.] Oniisama is a little more quiet and reserved, but you both share a lot in common.
Sometimes I think it would be terrifyingly scary if the two of you were enemies. [Take away any abilities her brother has as a pureblood, and it could be pretty heated.]