So I am still writing my oneshot but I have ADHD and my mind goes everywhere....and I came up with this (well I am sure others have thought of it) and I am just going to share this little tid bit while I make a very adorabley-toxic one shot :3 I will make this eventually (#trust) but I have been CLAWING at my skin to share this so take this little appetizer:
So in some (maybe magical?) great value European land there is a Queen Consort married to a King. Queen is the stereotypical evil queen misogynistic type iykwim. King falls in love with another woman, who is the pure innocent stereotype lady. He sleeps with her and gets her pregnant.
Queen consort finds out and is fuming (rightfully so) and is thinking of ways to get rid of the mistress and baby/babies (not rightfully so but I understand where she is coming from) and when she is planning to meet the pregnant mistress instead of having her villain moment or whatever (I feel you can understand what archetypes these characters are) she ends up falling in love with the mistress.
So instead of killing the mistress and baby, she overthrows the king and becomes a Yandere for Mistress and the baby/babies (Platonically for the babies, of course) and the have a very yuriful life.