The two seem to care for each other for some reason for astarte she was willing to betray her master abit in order to help him and secure his safety while for kojou when he confronted the deacon again he showed anger and disdain because he knew how dangerous it is for astarte by installing a familiar into her shortening her life and after defeating astarte kojou brought her familier under his control so she can live longer. She later becomes a maid for Natsuki he does get worried and concered for her whenever she is injured or hurt.
