A frown briefly flitted across Zeus' features as she mentioned the potential for offers from his older brothers. His expression, however, was quickly trained back to something much more agreeable. Even at this early phase—indeed, especially at this early phase—Zeus knew it was important to be diplomatic, and that meant (probably) playing nicely with the witch goddess. Especially since she knew, since she was well aware of what he had done to get what he so desired.
He nodded at her last words, however.
"And for that, I thank you, my lady," he said, gracefully. "I know you will be a great asset to our courts, as you have already shown by your involvement in our great matter, things for which my appreciation knows no bounds."