There was a post going around tumblr that really got under my skin -
it was a fairy accurate summary of the king and lionheart dynamic, but the line about not being able to find a example with a lady just***... triggered all my past experience of people dismissing het and femme-slash because [pick a square from your slash fangirl bingo card, pick any square].
*** I also want to note that the person I linked from tagged this post 'Kate/Clint' SO CLEARLY I AM NOT THE ONLY PERSON WHO THINKS THAT THIS DYNAMIC EXISTS WITH LADIES.
So, queen and lionheart dynamics. The examples that came to mind:
Lydia/Allison (Teen Wolf)
Sabriel/Touchstone (Sabriel, bolded because so much yes.)
Tremaine/Ilias (although that's more spy/lionheart)
Mulan/Aurora (Once Upon A Time)
Jane/Darcy (would be the super-fluffy version of this trope)
Any Evil Queen/Huntsman story would be the evil example of this trope
I'd accept a case for Hermione/Ron here.
I think a case could also be made for Cameron/John from TSCC.
Richard/Cara (LOTS)