Low key depressing as fuck, like Damn the Duke is just messed up, it's like a realistic yandere story that shows the consequences of being a possessive bastard instead of it being played for laughs, it shows how isolated and controlled the MC feels, how even if she does stay with him or loves him, he won't ever change, he'll try to be more affectionate but will always try to control her and disregard her wishes...
The Mistress Runs Away