After what happened and finding out that Esther was her aunt, Elise was given the choice to kill Esther but she didn't and instead released Esther from her bind, letting her now enjoy her life with her.
"I don't get it," Esther said, her body moving closer to her left side where there was a wall of the carriage in order to escape from Beelzebub who had been persistent on cutting the distance on their seat, "You had plenty of chances to kill me and are you not afraid that I would escape now?"
"But you can't, and you wouldn't," Elise answered. She knew there was something strange with Esther one of it was how she willingly come to the castle knowing well she could die. The woman wasn't lying when she said she came for her and she was helping Gabriel therefore she won't escape until she finished what she wanted.