While I agree that this does not bode well, I am not so sure that the ladies are actually Xarenia and Arezel. They look too young, as in pre-teens to early teens, the same age as the boys. I could believe Sif dressed as Xarenia, however.

On the other hand, Zeus having a hand in things I can easily believe. And I can easily think of a way to tempt both of them. First, simply dropping half their apparent years (roughly) without them losing any knowledge would be tempting in and of itself for many people. A pile of gold and gems would also help. For Arazel, quality time learning new magic from Hecate, the Greek Goddess of Magic could sweeten the pot. And this is all especially true if he promised to either return them to their true ages, or adults but a few years younger than their true ages, with no loss of knowledge and abilities afterwords.