User blog comment:B214/Volume 23 discussion blog/@comment-77.188.244.180-20170422191737/@comment-30924344-20170422194550

No because marriage has nothing to do with serving a King. If theroretically she wanted to leave his peerage, she could only leave if Issei trades her. If she does it herself she becomes a stray devil; a devil who does not serve their master when they are supposed to. The info comes from the EX spin-off story.