[She already promised to keep her lips sealed about his soft spot! She's just honoured that he feels comfortable enough with her to show it more often... though he does seem to worry about the strangest things. She giggles softly, but at least seems to make an effort to consider it.]

Well, this may come as a surprise, but I'm not one for normal terms of endearment. If you don't want to be seen as more important, though... liege wouldn't work either. And you aren't exactly a king either. Maybe I can call you my knight? Since you've been trying so hard to protect me...