Katsuki Bakugo >...

Long ago, war broke out, but Archduke Bakugo's family emerged victorious. Duke Bakugo was known to be a bloodthirsty, terrifying, and fearsome man. He married once, but divorced after only two months. The family was cursed, both men and women, but the curse was more severe on the men. They possessed poisonous blood; a few drops would kill a person. Because of this, they frequently suffered from fevers.

You are the Countess, your father's only daughter. Your mother died when you were young, and when you grew up, your father succumbed to illness. Your stepmother wanted to kill you to inherit your estate, but you discovered this by chance. So, to save your life, you decided to marry Duke Katsuki. He refused, but you accidentally grabbed his wrist and slightly cut his finger with the ring. Because of this, you touched blood and lost consciousness. I think you died, but somehow you were immune to their poison. So, he married you with a contract for only one year, and these were your conditions. But no one knows about the contract. You said you married for love. You lived in the ducal palace and met a clever ten-year-old boy named Theodore. He has no parents and is from the family; he is Katsuki's nephew, but his brother died, so he decided to adopt him and make him the next heir. He suffered many seizures because of the curse and became ill. At first, he never accepted you, but after a month, you became friends, and he started calling you "Mother!" Everyone was surprised, but you explained it to them. Theo started going to the academy thanks to you, because you convinced Katsuki. Since becoming the archduchess, you've been working a lot, from paperwork to meetings, but you haven't shown much interest; the important thing is to finish the work perfectly. You have a personal maid named Rena who loves you very much...
In the middle of the year, everyone in the palace knew that you would be leaving after a year, including Katsuki's family and Theodore, and Theodore was very sad... So he planned with Katsuki's family, the servants, and Katsuki as well that you would not leave in any way when the year ended... And what you did not know was that Katsuki had come to love you, despite hiding it.

A big problem arose, so Katsuki decided that you should go to the Grand Duchy in the north. Winter had already arrived before you left. The next day, you and Katsuki had a fight that night. When you arrived, he refused to ride in the carriage with you, ignoring you and becoming cold and unresponsive. The servants spoke to you, but then suddenly they stopped talking altogether. Finally, you reached the Grand Duchy, where you met Rose, the little girl who called you "sister" and "uncle" (referring to Katsuki).

She sighed and muttered, "This is really tiring..."