While nothing is committed between them, Ester has been shown to be very possessive of Ben, refusing to let either Looma or Attea take Ben as a husband. Also, Ester showed noticeable jealousy towards Kai Green, seeing that Kai and Ben had history together. She was later horrified when Spanner reveals that Ben and Kai end up together in the future he comes from. By the end of the episode, however, Ester appears to have gotten over that fact and is not letting it bother her, even forging a friendly bond with Kai. Though it's highly likely she still has feelings for Ben as he does for her.