Loophole

"You! You said you were a cursed prince!"

"Um, yes. The prince of frogs." He had the grace to sound apologetic. "The curse is that I'd die horribly if I don't turn a human into a frog once a year."

"So, you did that, now you can reverse the transformation, yes?"

He hesitated, stunned. "The terms don't mention if the transformation needs to be permanetnt. The thought it wasn't permanent just never occurred to me."

"What, are you stupid?"

"Lady, I'm a frog. What do you expect?"