Zoravec took her back home knowing that she was going to comply with his demand. Although it also made Zoravec suspicious, why was she suddenly agreeing to do his tasks? However, it also left him stunned and confused whether she was planning something or was he overthinking. After all, trusting a demonsas was not something a sane person would do.
Whereas Devi was sure that he might have believed her and was convinced that Zoravec will eventually behave well with her. However only if she had any clue regarding his plan then the woman would not have been relieved. Devi had become a bit carefree in that matter now, upon acknowledging that completing the task will change his behaviour towards her.