Riku gave the Prince a look that was pretty much one of horror. Spend time, ALONE, with Corin? Who didn't understand his fears (and was looking pretty annoyed about the whole thing. Who could blame him though? He came in thinking he had wonderful news to share, and Riku was acting like he wanted no part of it)
"Can... can you read it first, before me?" With Corin is his brother wanted, but Riku didn't want to be sitting there, waiting for the shoe to drop on his head. He'd rather know, going in, that it was all good news.