My younger brother forces my flower path

When I reincarnated I wanted to live happily with my younger brother,
but the thing my younger brother, who will do anything for his sister, gave me was the crown off the head of the tyrant who was emperor just up until yesterday.
"I'll make the continent kneel at your feet, Sister!"
...At this rate, before I become the first Empress to unify the continent I'll die from over work, so I brought in a pushover- I mean husband- who is good at doing work, but...
Duke Dehart who is called the monster of the North.
He's compatible with his brother-in-law and is crazy bastard 2 who dreams of unification. Sigh, these bastards really....