I'm kind of disappointed by the sudden poly solution, since the conflict is pretty dumb. Plus the prince looks like a decent guy but ends up like the third wheel in his own marriage, so I feel bad for him. I mean, if the future queen cares so much about Shion, she could just hire her as a lady-in-waiting, and then they'd spend all day together. There's no reason why she wouldn't be able to see her whenever she wanted.