From what I know it was not uncommon in that time period for a lord to take on a mistress. Im disapointed Sess's dad took on a human, but maybe he had his reasons. Sess is a perfect killing machine and his mother must be proud. I think he gets most his looks from her. He has her cold sense of humor too. But..his mother did point out that he learned a valuable lesson with the death of Rin. I read the manga online. If you can't find it message me and I will send you the link.