But, he was interrupted by Yuuko-san, who offered to grant the same wish. I have already told you both that I accepted, even though she called it a "grave sin", and it would alter the future of others as well, not just the princess.
She said that if I made that wish, I would not be able to stay by the princess's side. My freedom would be stolen, my life would be placed in grave danger, and I would be able to do nothing but watch. In other words, the price was my freedom, time, and relationships.