This is truly a suicide mission, but it proves Christina is a genius. Who else could come up with such a perfect plan, even sacrificing herself? She even forces herself to put her feelings aside to fulfill her duty.
It's been a while since volume 28 came out, and I still can't believe this actually happened. Rio kissed Christina, and not only that, but he bathed her completely naked. That alone should be reason enough for him to take responsibility for what he did, although I understand there was no other way. Christina was a princess, and in a way, he took away some of her innocence. It seems unfair that she doesn't know about the kiss; it's like her first kiss was stolen. If there were no rules, it would be inevitable that they would have to get married.
Although it's obvious that Christina loves him, it's a shame that Rio doesn't feel the same way. And Christina would never make him take responsibility when he doesn't love her, because Christina has more pride than anything else.