Fairy-Struck
"Any sidhe can work that kind of magic on a human but to cast it on a fellow fairy is impossible for all but King Keir. So, you must be the new princess, his half-human daughter."
"I am." I waved it aside. "Tell me more about this magic. You're sure that we can trust it to keep Bress on our side?"
"Yes," she said gravely. "He will stay under your enchantment until you release him. The magic is called star-crossing and those under its sway are the starry-eyed. It's one of the few magics which can only be undone by the caster."
"Very witty; starry-eyed." I chuckled, and she moaned as I accidentally shifted her. "Oh, crap; I'm sorry. What's your name, anyway? I'm Seren."