Looking for a Brother
After the Prince's episode, Riku was perfectly content to stay near home for the next few days. He studied hard, went to all the meetings he could with the Prince, attended all meals faithfully, met with Lord Ryder and introduced him to the Prince... and then subjected his courtier-possible to the Prince's sister and the ladies. He was exactly where he needed to be, when he needed to be.
And it was driving Corin crazy.
He sent his brother three different messages to come and see him at camp. And each time Riku sent a short message back that he was regretfully unable to. That he was busy.
What on earth could the companion of a Prince be BUSY with? Aside from the obvious.
So, during his extended break between training, drill, and duty, to go and find his brother. Only to be told that he was busy. BUSY! And couldn't see him. So he asked... as nicely as possible, to see the Prince instead. Who was available.